PSINET INC
S-4/A, 2000-05-17
COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
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<PAGE>


   As filed with the Securities and Exchange Commission on May 12, 2000

                                                 Registration No. 333-34802
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                --------------

                              AMENDMENT NO. 1

                                    TO
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                                --------------
                                  PSINet Inc.
             (Exact name of registrant as specified in its charter)
        New York                     4813                    16-1353600
     (State or other           (Primary Standard          (I.R.S. Employer
     jurisdiction of              Industrial             Identification No.)
    incorporation or          Classification Code
      organization)                 Number)

                44983 Knoll Square, Ashburn, Virginia 20147

                              (703) 726-4100
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
                            Kathleen B. Horne, Esq.
                   Senior Vice President and General Counsel
                                  PSINet Inc.

                44983 Knoll Square, Ashburn, Virginia 20147

        Telephone No.: (703) 726-4100/Facsimile No.: (703) 726-4265
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)
                                --------------
                                   Copies To:
    Nixon Peabody LLP       Margaret G. Reed, Esq.     Vinson & Elkins L.L.P.
   437 Madison Avenue        Senior Vice President       1001 Fannin Street
New York, New York 10022      and General Counsel       Houston, Texas 77002
  Attention: Richard F.     Metamor Worldwide, Inc.     Attention: Jeffery B.
    Langan, Jr., Esq.       4400 Post Oak Parkway,           Floyd, Esq.
  Telephone No.: (212)            Suite 1100            Telephone No.: (713)
        940-3140                                              758-2194
  Facsimile No.: (212)       Houston, Texas 77027       Facsimile No.: (713)
        940-9940                                              615-5660
                             Telephone No.: (713)
                                   548-3467
                             Facsimile No.: (713)
                                   627-1059

                                --------------

   Approximate date of commencement of proposed sale to the public: As soon as
practicable after this Registration Statement becomes effective and all other
conditions to the merger referred to herein have been satisfied or waived.

   If the securities being registered on this Form are to be offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. [_]
   If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_]
   If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
                                --------------

                      CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  Proposed           Proposed
                                                                  Maximum            Maximum
         Title of Each Class of              Amount to be         Offering          Aggregate          Amount of
      Securities to be Registered             Registered      Price Per Share     Offering Price    Registration Fee
- --------------------------------------------------------------------------------------------------------------------
<S>                                       <C>                <C>                <C>                <C>
                                              40,750,647
Common Stock, par value $.01 per share..      shares(1)         22.916667(2)      933,869,000(2)      $246,541(3)
- --------------------------------------------------------------------------------------------------------------------
</TABLE>
- --------------------------------------------------------------------------------

(1) Represents the maximum aggregate number of shares of the registrant's
    common stock that may be issued in connection with the merger, consisting
    of shares of PSINet common stock issued for (a) 34,641,443 shares of
    Metamor Worldwide, Inc. common stock currently outstanding, (b) up to
    4,898,142 shares of Metamor common stock that may be issued pursuant to
    Metamor's stock option plans, (c) up to 350,000 shares of Metamor common
    stock that may be issued pursuant to Metamor's employee stock purchase
    plan, and (d) up to 5,388,912 shares of Metamor common stock that may be
    issued upon the conversion of Metamor's outstanding 2.94% Convertible
    Subordinated Notes. The Metamor common stock outstanding at the time of the
    merger will be converted into the right to receive shares of PSINet common
    stock at an exchange ratio of 0.9:1.0. Includes a like number of preferred
    share purchase rights. Since no separate consideration is paid for the
    rights, the registration fee is included in the fee for the common stock.

(2) Estimated solely for the purpose of calculating the registration fee
    required by Section 6(b) of the Securities Act, and calculated pursuant to
    Rule 457(f) under the Securities Act. Pursuant to Rule 457(f)(1) under the
    Securities Act, the proposed maximum aggregate offering price of the
    registrant's common stock to be issued as merger consideration in
    connection with the merger of a wholly owned subsidiary of the registrant
    into Metamor was calculated in accordance with Rule 457(c) under the
    Securities Act as: (a) $20.625, the average of the high and low prices per
    share of Metamor common stock on April 12, 2000 as reported on The Nasdaq
    Stock Market, multiplied by (b) 45,278,497, the maximum aggregate number of
    shares of Metamor common stock that may be received by the registrant or
    cancelled as a result of the merger.

(3) Previously paid.            --------------

   The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant
shall file a further amendment which specifically states that this registration
statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the registration statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

The information contained in this proxy statement/prospectus is not complete and
may be changed. These securities may not be sold until the registration
statement filed with the Securities and Exchange Commission is effective. This
proxy statement/prospectus is not an offer to sell these securities and it is
not soliciting an offer to buy these securities in any state where the offer or
sale is not permitted.

                Subject to Completion, Dated May 12, 2000

[METAMOR LOGO]

[PSINet LOGO]        JOINT PROXY STATEMENT/PROSPECTUS

   The boards of directors of PSINet and Metamor, voting unanimously, have
approved a merger agreement that provides for the merger of a wholly owned
subsidiary of PSINet with and into Metamor. If the merger is completed, each
share of Metamor's common stock will be exchanged for 0.9 of a share of PSINet
common stock. PSINet common stock is quoted on The Nasdaq Stock Market under
the symbol "PSIX."

   The merger cannot be completed unless both PSINet's shareholders approve the
issuance of PSINet's common stock in accordance with the rules of The Nasdaq
Stock Market and Metamor's stockholders approve the merger in accordance with
Delaware corporate law. We have scheduled special meetings for PSINet's
shareholders to vote on the issuance of PSINet's common stock in connection
with the merger and on certain amendments to PSINet's Employee Stock Purchase
Plans and for Metamor's stockholders to vote on the merger. The dates, times
and places of the meetings are as follows:

      For PSINet shareholders:                 For Metamor stockholders:

         June 15, 2000                            June 15, 2000
       10:00 a.m. local time                     9:00 a.m. local time
         44983 Knoll Square
         Ashburn, Virginia                     The St. Regis Hotel

                                               1919 Briar Oaks Lane
                                                    Houston, Texas

   The special meetings of PSINet and Metamor are different than the annual
meetings of PSINet and Metamor which are scheduled to be held on May 15, 2000
and May 18, 2000, respectively, and the actions scheduled to be taken at the
special meetings are different from those scheduled to be taken at the annual
meetings. In addition to casting your vote for the annual meeting, please cast
your vote for the special meeting by telephone, over the Internet or by
completing, signing and dating your proxy card and returning it in the enclosed
envelope.

   This document is a prospectus of PSINet relating to the issuance of up to
40,750,647 shares of PSINet's common stock in connection with the merger and a
proxy statement for both PSINet and Metamor to use in soliciting proxies for
our special meetings. It contains answers to frequently asked questions and a
summary description of the merger (beginning on page 1), followed by a more
detailed discussion of the merger and related matters. You should also consider
the matters discussed under "Risk Factors Relating to the Merger" commencing on
page 19 of the enclosed proxy statement/prospectus. We urge you to review
carefully this entire document.

      William L. Schrader                        Peter T. Dameris
    Chairman and Chief Executive         Chairman, Chief Executive Officer and
              Officer                                  President
            PSINet Inc.                         Metamor Worldwide, Inc.

   Neither the Securities and Exchange Commission nor any state securities
regulator has approved or disapproved the merger described in the proxy
statement/prospectus or the PSINet common stock to be issued in connection with
the merger, or determined if the proxy statement/prospectus is accurate or
adequate. Any representation to the contrary is a criminal offense.

   This proxy statement/prospectus is dated May 12, 2000, and is first being
mailed to stockholders on or about May 15, 2000.
<PAGE>

                      REFERENCES TO ADDITIONAL INFORMATION

   This document incorporates important business and financial information
about PSINet and Metamor from documents that are not included in or delivered
with this document. This information is available to you without charge upon
your written or oral request. You can obtain documents incorporated by
reference in this document by requesting them in writing or by telephone from
the appropriate company at the following addresses and telephone numbers:

               PSINet Inc.                         Metamor Worldwide, Inc.
                                              4400 Post Oak Parkway, Suite 1100
         44983 Knoll Square
                                                    Houston, Texas 77027
      Ashburn, Virginia 20147
      Attention: Investor Relations             Attention: Investor Relations
                                                  Telephone: (713) 548-3488
     Telephone: (703) 726-1577
                                                  Facsimile: (713) 963-9711
     Facsimile: (703) 726-4261

    email: [email protected]         email: [email protected]

   See also "Where You Can Find More Information" beginning on page 104. If you
would like to request documents, please do so by June 8, 2000 in order to
receive them before the applicable special meeting.
<PAGE>

                                  PSINet INC.

                               ----------------

                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS

                        TO BE HELD ON JUNE 15, 2000

                               ----------------
To the Shareholders of PSINet Inc.:

   We will hold a special meeting of the shareholders of PSINet Inc. on
Thursday, June 15, 2000, at 10:00 a.m., local time, at the company's offices
located at 44983 Knoll Square, Ashburn, Virginia for the following purposes:

  .  to consider and vote upon a proposal to approve the issuance of shares
     of common stock, par value $0.01 per share, of PSINet pursuant to the
     agreement and plan of merger among PSINet Inc., PSINet Shelf IV Inc. (a
     wholly owned subsidiary of PSINet Inc.) and Metamor Worldwide, Inc.
     under which Metamor will become a wholly owned subsidiary of PSINet,
     including shares to be issued as merger consideration to the Metamor
     stockholders, shares issuable under Metamor options that are assumed by
     PSINet and shares issuable upon the conversion of outstanding
     convertible notes of Metamor that are not converted prior to the merger;
     and

  .  to consider and vote upon a proposal to amend PSINet's 1999 Employee
     Stock Purchase Plan and 1999 International Employee Stock Purchase Plan
     to increase the number of shares of PSINet's common stock that may be
     issued under such plans from 2,115,000 shares to 4,115,000 shares and to
     permit PSINet to allow employees of acquired companies to begin
     participating in such plans at such times and on such terms as the
     committee administering the plans may determine.

   The approval of the amendments to the Employee Stock Purchase Plans is not a
condition to the completion of the merger, and the approval of the issuance of
the shares of PSINet common stock in connection with the merger is not a
condition to the amendment of the Employee Stock Purchase Plans. We will
transact no other business at the special meeting, except such business as may
properly be brought before the special meeting or any adjournment of it by
PSINet's board of directors.

   Only holders of record of shares of PSINet common stock at the close of
business on April 25, 2000, the record date for the special meeting, are
entitled to notice of, and to vote at, the special meeting and any adjournments
or postponements of it. PSINet and Metamor cannot complete the merger unless a
quorum is present at the special meeting and a majority of the total votes cast
at the special meeting by the holders of the shares of PSINet common stock
outstanding as of the record date are voted in favor of the issuance of the
shares of PSINet's common stock.

   For more information about the merger, please review the accompanying proxy
statement/prospectus and the copy of the merger agreement attached as Annex 1.

   After careful consideration, PSINet's board of directors has unanimously
approved the merger agreement and the amendments to PSINet's Employee Stock
Purchase Plans. The board has determined that the merger, the issuance of
PSINet's common stock and the plan amendments are fair to you and in your best
interests. The board of directors unanimously recommends that you vote for the
issuance of PSINet's common stock and for the amendments to PSINet's Employee
Stock Purchase Plans.

                                          By Order of the Board of Directors,

                                          Kathleen B. Horne
                                          Senior Vice President, General
                                          Counsel and Corporate Secretary

Ashburn, Virginia

May 12, 2000


    Whether or not you plan to attend the special meeting, please cast your
 vote by telephone, over the Internet or by completing, signing and dating
 the enclosed proxy and returning it promptly in the enclosed postage-paid
 envelope.


<PAGE>


                            METAMOR WORLDWIDE, INC.

                               ----------------

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

                        TO BE HELD ON JUNE 15, 2000

                               ----------------

To the Stockholders of Metamor Worldwide, Inc.:

   We will hold a special meeting of the stockholders of Metamor Worldwide,
Inc. on Thursday, June 15, 2000, at 9:00 a.m., local time, at The St. Regis
Hotel, 1919 Briar Oaks Lane, Houston, Texas, for the following purpose:

    To consider and vote upon a proposal to adopt the agreement and plan of
    merger among PSINet Inc., PSINet Shelf IV Inc. (a wholly owned
    subsidiary of PSINet Inc.) and Metamor Worldwide, Inc.

   We will transact no other business at the special meeting, except such
business as may properly be brought before the special meeting or any
adjournment of it by Metamor's board of directors.

   Only holders of record of shares of Metamor common stock at the close of
business on April 25, 2000, the record date for the special meeting, are
entitled to notice of, and to vote at, the special meeting and any adjournments
or postponements of it. Metamor and PSINet cannot complete the merger unless
the holders of a majority of the outstanding shares of Metamor common stock
vote to adopt the merger agreement.

   For more information about the merger, please review the accompanying proxy
statement/prospectus and the copy of the merger agreement attached as Annex 1.

   Please do not send any stock certificates at this time.

   After careful consideration, Metamor's board of directors has approved the
merger agreement by unanimous vote and determined that the merger is fair to
you and in your best interests. The board of directors unanimously recommends
that you vote for the adoption of the merger agreement.

                                          By Order of the Board of Directors,

                                          Margaret G. Reed
                                          Senior Vice President, General
                                          Counsel

                                          and Corporate Secretary

Houston, Texas

May 12, 2000

    Whether or not you plan to attend the special meeting, please cast your
 vote by telephone, over the Internet or by completing, signing and dating
 the enclosed proxy and returning it promptly in the enclosed postage-paid
 envelope.

<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----

<S>                                                                        <C>
Questions and Answers.....................................................   1

Summary...................................................................   4
  PSINet Summary Unaudited Pro Forma Condensed Combined Financial
   Information............................................................  15
  PSINet Summary Consolidated Financial and Operating Data................  16
  Metamor Summary Consolidated Financial Data.............................  18

Risk Factors..............................................................  19
  Risk Factors Relating to the Merger.....................................  19
  Risk Factors Relating to PSINet.........................................  20
  Risk Factors Relating to Metamor........................................  28

The Companies.............................................................  29
  PSINet Inc. ............................................................  29
  Metamor Worldwide, Inc. ................................................  31

The Special Meetings......................................................  34
  The PSINet Special Meeting..............................................  34
  The Metamor Special Meeting.............................................  35
  Voting of Proxies.......................................................  36
  Revocability of Proxies.................................................  36
  Solicitation of Proxies.................................................  37

The Merger................................................................  38
  Background to the Merger................................................  38
  PSINet's Reasons for the Merger and Board of Directors' Recommendation..  41
  Metamor's Reasons for the Merger and Board of Directors'
   Recommendation.........................................................  43
  Opinion of PSINet's Financial Advisor...................................  45
  Opinion of Metamor's Financial Advisor..................................  54
  Interests of Metamor Directors and Management in the Merger.............  59
  Tax Treatment...........................................................  61
  Form of the Merger......................................................  61
  Merger Consideration....................................................  61
  Conversion of Shares; Procedures for Exchange of Certificates;
   Fractional Shares......................................................  61
  Effective Time of the Merger............................................  62
  Listing of PSINet Common Stock on The Nasdaq Stock Market...............  62
  Material United States Federal Income Tax Consequences of the Merger....  62
  Accounting Treatment....................................................  64
  Regulatory Matters......................................................  64
  Appraisal Rights........................................................  64
  Continuation of Metamor Employee Benefits...............................  64
  Effect on Options Outstanding under Metamor Stock Plans.................  65
  Resale of PSINet Common Stock...........................................  65
  Investment by PSINet in Xpedior.........................................  65

The Merger Agreement......................................................  66
  Conditions to the Completion of the Merger..............................  66
  No Solicitation of Alternate Transactions...............................  67
  Termination.............................................................  68
  Termination Fees........................................................  68
  Conduct of Business Pending the Merger..................................  69
  Repayment of Metamor Debt; Convertible Notes............................  71
  Amendment and Waiver....................................................  71
</TABLE>

                                      -i-
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----

<S>                                                                        <C>
  Expenses................................................................  72
  Representations and Warranties..........................................  72
  Amendments to the Metamor Certificate of Incorporation..................  72

Unaudited Pro Forma Condensed Combined Financial Information..............  73

Pro Forma Capitalization of PSINet........................................  82

Description of PSINet Capital Stock.......................................  83
  Common Stock............................................................  83
  Preferred Stock.........................................................  83
  Registration Rights.....................................................  86
  New York Anti-Takeover Law, Certain Charter and By-law Provisions and
   Other Anti-takeover Considerations.....................................  87
  Shareholder Rights Plan.................................................  89
  Transfer Agent and Registrar............................................  90

Comparison of Rights of Holders of Common Stock of PSINet and Metamor.....  90

PSINet Employee Stock Purchase Plans......................................  96

PSINet Executive Compensation.............................................  99

Legal Matters............................................................. 103

Experts................................................................... 103

Other Matters............................................................. 104

Where You Can Find More Information....................................... 104

Documents Incorporated by Reference....................................... 105

Special Note Regarding Forward-Looking Statements......................... 106
</TABLE>

<TABLE>
<CAPTION>
 Annexes
 -------
 <C>     <S>
 Annex 1 Agreement and Plan of Merger
 Annex 2 Opinion of FleetBoston Robertson Stephens Inc.
 Annex 3 Opinion of Lazard Freres & Co. LLC
 Annex 4 Proposed Amendments to PSINet's Employee Stock Purchase Plans
</TABLE>


                                      -ii-
<PAGE>


                           QUESTIONS AND ANSWERS

Q: Why are PSINet and Metamor proposing to merge?

A:  PSINet is a leading global provider of Internet and eCommerce solutions to
    businesses. As an Internet Super Carrier, it provides Internet connectivity
    and Web hosting services to approximately 100,000 corporate customers in 28
    countries. Including its ISP, carrier, small office/home office (SOHO) and
    consumer businesses, PSINet serves over 2.0 million end users around the
    world. It serves approximately 90 of the 100 largest metropolitan
    statistical areas in the U.S. and has a presence in the 20 largest
    telecommunications markets globally.

  Metamor is a leading provider of information technology, or IT, solutions
  and offers a broad array of IT solutions through its four business units:

    .  Metamor Enterprise Solutions, a provider of comprehensive enterprise
       value chain services, including supply chain management, enterprise
       resource planning and customer relationship management;

    .  Metamor Global Solutions, a provider of global application
       development and outsourcing;

    .  Metamor Industry Solutions, a provider of industry segment
       solutions; and

    .  Metamor European Operations, a provider of IT consulting and ERP
       solutions in the European market.

  Metamor also owns approximately 80% of Xpedior Incorporated, a publicly-
  traded company that provides innovative, comprehensive eBusiness solutions
  for Global 2000 companies and emerging Internet businesses.

  Metamor's IT service offerings are complementary to PSINet's hosting and
  network capabilities, with virtually no overlap in customers or services.
  The combined companies will have the ability to offer a broad array of
  "end-to-end" solutions to business customers of all sizes. This type of
  comprehensive solution is in high demand in the middle market where the
  combined company will focus a major portion of its marketing efforts.

Q: What will happen in the merger?

A:  Metamor will become a wholly owned subsidiary of PSINet, and Metamor's
    stockholders will become shareholders of PSINet.

Q: What will Metamor stockholders receive?

A:  In exchange for each of their Metamor shares, Metamor stockholders will
    receive 0.9 of a share of PSINet common stock.

Q: Why is PSINet Proposing to Amend its Employee Stock Purchase Plans?

A:  PSINet is proposing to amend its Employee Stock Purchase Plans to increase
    the number of shares of PSINet's common stock that may be issued under the
    plans from 2,115,000 shares to 4,115,000 shares and to permit PSINet to
    allow employees of acquired companies to begin participating in the plans
    at such times and on such terms as the committee administering the plans
    may determine. The amendment to increase the number of shares is necessary
    to accommodate the significant increase in the number of employees of
    PSINet as a result of the merger. The amendment to provide flexibility with
    respect to employees of acquired companies is necessary to permit Metamor
    employees to begin participating in the plans prior to the commencement of
    a new offering period under the plans, subject to the discretion of the
    committee administering the plans.

                                       1
<PAGE>

Q:  What do I need to do now?

A:  After carefully reading and considering the information contained in this
    document, please cast your vote. You may vote by telephone, over the
    Internet or by completing and signing your proxy and returning it in the
    enclosed return envelope as soon as possible, so that your shares may be
    represented at the applicable special meeting. If you sign and send in your
    proxy and do not indicate how you want to vote, we will count your proxy as
    a vote in favor of the issuance of the PSINet common stock and the
    amendments to PSINet's Employee Stock Purchase Plans if you are a PSINet
    shareholder and in favor of adoption of the merger agreement if you are a
    Metamor stockholder.

  The special meetings will take place on June 15, 2000. You may attend the
  applicable special meeting and vote your shares in person, rather than
  providing your proxy.

Q:  How do I vote by telephone or over the Internet?

A: If you are a PSINet shareholder, you may vote as follows:

  .  you may vote using a telephone by calling 1-877-PRX-VOTE (1-877-779-
     8683) from a touch tone telephone 24 hours a day 7 days a week; or

  .  you may vote using the Internet by visiting the website
     http://www.eproxyvote.com/psix-1.

  If you are a Metamor stockholder, you may vote as follows:

  .  you may vote using a telephone by calling 1-800-PROXIES (1-800-776-9437)
     from a touch tone telephone 24 hours a day 7 days a week; or

  .  you may vote using the Internet by visiting the website
     http://www.voteproxy.com.

  When you call the applicable number or visit the applicable web site,
  simply follow the instructions provided. In order to vote, you will need to
  provide your social security number and the PIN number from your proxy card
  in the case of PSINet shareholders or the control number from your proxy
  card in the case of Metamor stockholders. The telephone and Internet voting
  systems will preserve the confidentiality of your vote and will confirm
  your voting instructions with you. You may also use the systems to change
  your selections on any or all of the proposals to be voted.

Q:  Can I change my vote after I have provided my proxy?

A:  Yes. You can change your vote at any time before your proxy is voted at the
    applicable special meeting. You can do this in one of three ways. First,
    you can send a written notice stating that you would like to revoke your
    proxy. Second, you can complete and submit a new proxy. If you choose
    either of these two methods, you must submit your notice of revocation to
    the Corporate Secretary of PSINet or Metamor, as applicable, at the address
    set forth below or submit your new proxy in the same way you submitted your
    prior proxy. Third, you can attend the applicable special meeting and vote
    in person.

Q:  If my PSINet or Metamor shares are held in "street name" by my broker, will
    my broker vote my shares for me?

A:  Your broker will vote your PSINet or Metamor shares only if you provide
    instructions on how to vote. You should follow the directions provided by
    your broker regarding how to instruct your broker to vote your shares.
    Without instructions, your shares will not be voted. PSINet shares that are
    not voted may reduce the likelihood that a quorum will be present at the
    PSINet special meeting. Metamor shares that are not voted will have the
    effect of a vote against the merger.

                                       2
<PAGE>

Q:  Should I send in my Metamor stock certificates now?

A:  No. You should continue to hold your Metamor stock certificates until after
    the merger is completed. After the merger is completed you will receive a
    transmittal letter from the paying agent with instructions on how to
    surrender your Metamor stock certificates. PSINet shareholders will not
    need to surrender their PSINet stock certificates at any time.

Q: When do you expect the merger to be completed?

A:  We expect the merger to be completed immediately after the special
    meetings.

Q:  Will the rights of Metamor stockholders before the merger be different than
    their rights as PSINet shareholders after the merger?

A:  Yes. For a summary of material differences between the rights of Metamor
    stockholders and the rights of PSINet shareholders, see pages 90 through
    95.

Q:  Am I entitled to appraisal rights?

A:  No. Neither holders of PSINet common stock nor holders of Metamor common
    stock are entitled to appraisal rights in connection with the merger.

Q:  What are my tax consequences as a result of the merger?

A:  PSINet shareholders will not have any tax consequences as a result of the
    merger. Assuming the merger qualifies as a reorganization within the
    meaning of Section 368(a) of the Internal Revenue Code, holders of Metamor
    common stock will not recognize gain or loss for United States federal
    income tax purposes as a result of the exchange of their Metamor common
    stock for PSINet common stock in the merger, except with respect to cash
    received instead of fractional shares of PSINet common stock. We describe
    the material U.S. federal income tax consequences of the merger in more
    detail beginning on page 62, although your tax consequences will depend
    upon the facts of your own situation. You should consult your own tax
    advisor for a full understanding of the consequences of the merger on your
    tax position.

Q:  Who can help answer my questions?

A:  If you have any questions about the merger or if you need additional copies
    of this document or the enclosed proxy, you should contact either:

                PSINet Inc.                       Metamor Worldwide, Inc.
                                             4400 Post Oak Parkway, Suite 1100
          44983 Knoll Square
                                                   Houston, Texas 77027
       Ashburn, Virginia 20147
       Attention: Investor Relations           Attention: Investor Relations
                                                 Telephone: (713) 548-3488
      Telephone: (703) 726-1577
                                                 Facsimile: (713) 963-9711
      Facsimile: (703) 726-4261

     email: [email protected]       email: [email protected]

                                       3
<PAGE>

                                    SUMMARY

   This summary highlights selected information from this proxy
statement/prospectus and does not contain all of the information that is
important to you. To understand the merger fully and for a more complete
description of the terms of the merger, you should carefully read this entire
document and the other documents to which we have referred you. See "Where You
Can Find More Information" on page 104. We have included page references
parenthetically to direct you to a more complete description of the topics
presented in this summary. (As used in this document, "we" and "our" refers to
PSINet and Metamor together.)

                                 The Companies

PSINet Inc.

44983 Knoll Square

Ashburn, Virginia 20147

Telephone: (703) 726-4100

   PSINet is a leading global provider of Internet and eCommerce solutions to
businesses. With its worldwide fiber network and related optronic equipment,
multiple Internet and eCommerce hosting centers, full suite of Internet access
and eCommerce products, extensive global distribution network and global brand
name recognition, PSINet has become an Internet Super Carrier or ISC. It offers
a robust suite of products that enable its customers to utilize the Internet
around the globe for mission critical applications carried over a worldwide
fiber optic network that is capable of transmission speeds in excess of three
terabits per second. It provides Internet connectivity and Web hosting services
to approximately 100,000 corporate customers in 28 countries. Including its
Internet service provider (ISP), carrier, small office/home office (SOHO) and
consumer businesses, PSINet serves over 2.0 million end users around the world.
It serves approximately 90 of the 100 largest metropolitan statistical areas in
the U.S. and has a presence in the 20 largest telecommunications markets
globally.

   PSINet's services and products include dedicated, dial-up and digital
subscriber line (DSL) Internet access services connections, Web hosting and
collocation services, transaction network services, virtual private networks
(VPNs), eCommerce solutions, voice-over-Internet protocol (IP), e-mail and
managed security services. It also provides wholesale and private label network
connectivity and related services to other ISPs and telecommunications carriers
to further utilize its network capacity. PSINet operates eight Internet and
eCommerce hosting centers with an aggregate of 250,000 square feet in North
America, Europe and Asia and plans to open sixteen more hosting centers having
more than 1,750,000 additional square feet.

Metamor Worldwide, Inc.
4400 Post Oak Parkway, Suite 1100
Houston, Texas 77027
Telephone: (713) 548-3400

   Metamor is a leading provider of information technology (IT) solutions with
one of the broadest and most diverse service offerings available in the
industry. It was founded in 1993 as a traditional staffing services business
under the name COREStaff, Inc. In 1994, Metamor began offering information
technology services to its clients and in 1998 it divested itself of its
traditional staffing services business. In 1999, Metamor completed the initial
public offering of 20% of its eBusiness solutions subsidiary, Xpedior
Incorporated. On December 16, 1999, Xpedior began trading on The Nasdaq Stock
Market under the symbol "XPDR." Metamor still owns approximately 80% of the
outstanding stock of Xpedior.

   Information technology solutions consist of solutions relating to systems
that support the flow of information within and between companies and
institutions through electronic means, including computer

                                       4
<PAGE>

systems, software and peripheral systems. To meet the needs of its clients and
implement solutions with flexible project delivery capabilities, Metamor offers
a broad array of information technology solutions through its four business
units:

  .  Metamor Enterprise Solutions, a provider of comprehensive enterprise
     value chain services, including supply chain management, enterprise
     resource planning (ERP) and customer relationship management;

  .  Metamor Global Solutions, a provider of global application development
     and outsourcing;

  .  Metamor Industry Solutions, a provider of industry segment solutions;
     and

  .  Metamor European Operations, a provider of IT consulting and ERP
     solutions in the European market.

                            Recent Developments

   For the quarter ended March 31, 2000, PSINet reported, on a consolidated
basis, revenue of $222.9 million, EBITDA of $(15.5) million, and net loss
available to common shareholders of $(204.2) million, compared to revenue of
$104.9 million, EBITDA of $(6.8) million, and net loss available to common
shareholders of $(59.3) million reported in the comparable period in 1999. The
results for the quarter ended March 31, 2000 included a restructuring charge of
$16.9 million and $59.0 million of write-offs of assets and accelerated
depreciation and amortization of certain tangible and intangible assets. These
amounts relate to a plan developed and approved during the first quarter of
2000 directed at developing a global brand image, eliminating network
redundancies, streamlining operations and product offerings and leveraging
acquisition synergies. PSINet defines EBITDA as earnings (losses) before
interest expense and interest income, taxes, depreciation and amortization,
other non-operating income and expenses, charge for acquired in-process
research and development, restructuring charge and costs related to the planned
distribution or sale of its consumer business.

   As a result of acquisitions in 1998 and 1999, PSINet has amassed a
significant number of consumer customers throughout its operating regions. Its
primary strategic focus is on providing services to business and wholesale
customers. Accordingly, in February and March 2000 PSINet announced that it has
begun consolidating its worldwide retail consumer operations into a new retail
business unit known as Inter.net. Inter.net will be run by an experienced
management team and will consist of nearly 500 staff specialists in consumer
sales, marketing and customer support, as well as the existing billing and
customer support systems. Inter.net will initially serve approximately 550,000
consumer accounts distributed throughout global markets (mostly outside of the
United States), with over 30 localized consumer portals in more than 20
countries. PSINet is currently assessing its options regarding Inter.net,
including a possible IPO or spin-off of the business, to best maximize PSINet
shareholder value. As a result, during the first quarter of 2000 PSINet
incurred approximately $1.1 million of incremental direct costs related to the
consolidation and planned distribution or sale of its consumer business.

   For the quarter ended March 31, 2000, Metamor reported, on a consolidated
basis, revenues of $158.4 million and a net loss of $(5.7) million, compared to
revenues of $121.7 million and net income of $9.2 million reported in the
comparable period in 1999. Excluding Xpedior, Metamor's core units reported
revenues of $107.4 million for the quarter ended March 31, 2000 on a combined
basis.

                                       5
<PAGE>


                   The PSINet Special Meeting (page 34)

   The special meeting of PSINet shareholders will be held on Thursday, June
15, 2000, at 10:00 a.m., local time, at PSINet's offices located at 44983 Knoll
Square, Ashburn, Virginia. At the special meeting, PSINet will ask its
shareholders of record on April 25, 2000 to vote on two proposals:

  .  a proposal to approve the issuance of shares of common stock, par value
     $0.01 per share, of PSINet pursuant to the agreement and plan of merger
     among PSINet Inc., PSINet Shelf IV Inc. (a wholly owned subsidiary of
     PSINet Inc.) and Metamor Worldwide, Inc. under which Metamor will become
     a wholly owned subsidiary of PSINet; and

  .  a proposal to amend PSINet's Employee Stock Purchase Plans to increase
     the number of shares of PSINet common stock that may be issued under the
     plans and to provide PSINet with additional flexibility with respect to
     employees of acquired companies.

The shares of PSINet common stock that will be issued in connection with the
merger will include shares to be issued as merger consideration to the Metamor
stockholders, shares issuable under Metamor options that are assumed by PSINet
(including outstanding options under Metamor's Employee Stock Purchase Plan)
and shares issuable upon the conversion of outstanding convertible notes of
Metamor that are not converted prior to the merger. The proposed amendments to
PSINet's Employee Stock Purchase Plans would increase the aggregate number of
shares of PSINet's common stock that may be issued under the plans by 2,000,000
shares from 2,115,000 shares to 4,115,000 shares and would permit PSINet to
allow employees of acquired companies to begin participating in the plans at
such times and on such terms as the committee administering the plans may
determine.

   The approval of the amendments to the Employee Stock Purchase Plans is not a
condition to the completion of the merger, and the approval of the issuance of
the shares of PSINet common stock in connection with the merger is not a
condition to the amendment of the Employee Stock Purchase Plans.

Record Date; Voting Power

   PSINet shareholders are entitled to vote at the PSINet special meeting if
they owned PSINet shares as of the close of business on April 25, 2000, the
record date for the meeting.

   On the record date, there were 157,329,642 shares of PSINet common stock
entitled to vote at the PSINet special meeting. PSINet shareholders will have
one vote at the PSINet special meeting for each share of PSINet common stock
that they owned on the record date.

Quorum; Vote Required

   A majority of the outstanding shares of PSINet's common stock entitled to
vote at the PSINet special meeting is required to establish a quorum at the
special meeting. The affirmative vote of a majority of the votes cast at the
PSINet special meeting with respect to the issuance of the PSINet common stock
is required for the approval of the issuance of the PSINet common stock in
connection with the merger. The affirmative vote of a majority of the votes
cast at the PSINet special meeting with respect to the Employee Stock Purchase
Plan amendments is required for the approval of the plan amendments.

Voting by PSINet Directors and Executive Officers

   Based on information available to PSINet, it believes that as of the record
date its directors and executive officers and their affiliates owned and were
entitled to vote approximately 11,500,000 shares of PSINet common stock, or
approximately 7.3% of the shares of PSINet common stock outstanding on the
record date. William Schrader, PSINet's Chairman and Chief Executive Officer,
has agreed to vote 11,117,354 shares of

                                       6
<PAGE>


PSINet common stock that he is entitled to vote at the PSINet special meeting,
which represents 7.1% of the outstanding PSINet common stock entitled to vote
at the meeting, "for" the approval of the issuance of the PSINet common stock
in connection with the merger.

                   The Metamor Special Meeting (page 35)

   The special meeting of Metamor stockholders will be held on Thursday, June
15, 2000, at 9:00 a.m., local time, at The St. Regis Hotel, 1919 Briar Oaks
Lane, Houston, Texas. At the special meeting, Metamor will ask its stockholders
of record on April 25, 2000 to vote upon a proposal to adopt the merger
agreement.

Record Date; Voting Power

   Metamor stockholders are entitled to vote at the special meeting if they
owned Metamor shares as of the close of business on April 25, 2000, the record
date for the meeting.

   On the record date, there were 34,700,992 shares of Metamor common stock
entitled to vote at the Metamor special meeting. Metamor stockholders will have
one vote at the Metamor special meeting for each share of Metamor common stock
that they owned on the record date.

Vote Required

   The affirmative vote of a majority of the shares of Metamor common stock
outstanding on the record date is required to adopt the merger agreement.

Voting by Metamor Directors and Executive Officers

   Based on information available to Metamor, it believes that as of the record
date, Metamor directors and executive officers and their affiliates owned and
were entitled to vote 2,652,895 shares of Metamor's common stock, or
approximately 7.6% of the shares of Metamor common stock outstanding on the
record date. Peter Dameris, Metamor's Chairman, Chief Executive Officer and
President, has agreed to vote 48,650 shares of Metamor common stock that he is
entitled to vote at the Metamor special meeting, representing less than one
percent of the outstanding Metamor common stock entitled to vote at the
meeting, "for" the adoption of the merger agreement.

                           The Merger (page 38)

   The merger agreement is attached as Annex 1 to this document. We encourage
you to read the merger agreement. It is the principal document governing the
merger.

Structure of the Merger

   Subject to the terms and conditions of the merger agreement, PSINet Shelf IV
Inc., a wholly owned subsidiary of PSINet, will merge with and into Metamor. At
the effective time of the merger, the separate corporate existence of PSINet
Shelf IV Inc. will end. Metamor will be the surviving corporation in the merger
and will continue its corporate existence as a wholly owned subsidiary of
PSINet.

What Metamor Stockholders Will Receive in the Merger (page 61)

   The merger agreement provides that, at the effective time of the merger,
each issued and outstanding share of Metamor common stock will be converted
into the right to receive PSINet common stock at an exchange ratio of 0.9 of a
share of PSINet common stock for each share of Metamor common stock.

                                       7
<PAGE>


Treatment of Metamor Stock Options (page 65)

   At the effective time of the merger, each outstanding option to purchase
Metamor common stock will be assumed by PSINet and converted into an option to
purchase a number of shares of PSINet common stock equal to the number of
Metamor shares covered by the option multiplied by the exchange ratio (i.e.,
0.9:1.0), with an exercise price equal to the exercise price in effect prior to
the merger divided by the exchange ratio. The assumed options will otherwise be
subject to their existing terms and conditions. The vesting of some Metamor
stock options will automatically accelerate as a result of the merger,
including options to purchase approximately 132,000 shares of Metamor stock
held by officers and directors of Metamor.

Repayment of Metamor Debt; Convertible Notes

   Metamor and PSINet have agreed to cooperate to pay or satisfy at the
effective time of the merger the outstanding debt of Metamor and its
subsidiaries, with limited exceptions. This debt includes an aggregate of
approximately $40.2 million of borrowings or commitments under Metamor's
revolving credit facility, as of April 25, 2000, and approximately $227 million
face amount of convertible subordinated notes of Metamor. The parties expect
that the convertible notes will be called for redemption on August 18, 2000
(the earliest call date for the notes). The convertible notes are convertible
into Metamor common stock at an effective conversion price of $37.95 per share
(based on the applicable redemption price on the earliest redemption date). The
convertible notes will become convertible into PSINet common stock upon
consummation of the merger at an appropriately adjusted conversion rate. The
notes may be converted by the holders of the notes at any time prior to the
redemption date, and any notes not converted prior to the redemption date will
be redeemed for cash.

Ownership of PSINet Following the Merger

   Based on the number of outstanding Metamor shares on its record date and
assuming that no convertible notes of Metamor are converted, no outstanding
options of Metamor are exercised, and no Metamor shares are purchased under
Metamor's employee stock purchase plan prior to the merger, Metamor
stockholders will receive approximately 31.2 million shares of PSINet common
stock in the merger. As of the record date, the total number of shares of
PSINet common stock that may be issued as a result of the Metamor transaction
is approximately 40.6 million if all outstanding Metamor convertible notes are
converted, all Metamor options that are outstanding or permitted to be granted
prior to the merger are exercised, and 350,000 Metamor shares are purchased
under Metamor's employee stock purchase plan. Based on these numbers and on the
number of outstanding shares of PSINet common stock on its record date,
following the merger former Metamor stockholders, noteholders and option
holders will own in the aggregate between 19.9% and 25.8% of the outstanding
shares of PSINet common stock.

Investment by PSINet in Xpedior (page 65)

   PSINet and Xpedior have entered into a letter of intent relating to an
investment by PSINet of $50 million in Xpedior preferred stock simultaneously
with the closing of the merger. While the making of this investment is
conditioned upon the completion of the merger, it is not a condition to the
consummation of the merger.

Appraisal Rights (page 64)

   Neither PSINet shareholders nor Metamor stockholders will have appraisal
rights in connection with the merger.


                                       8
<PAGE>


Material United States Federal Income Tax Consequences of the Merger (page 62)

   The merger is intended to qualify as a reorganization within the meaning of
Section 368(a) of the Internal Revenue Code. It is a condition to the
completion of the merger that Metamor receive an opinion from its attorneys to
the effect that the merger will be treated as a reorganization within the
meaning of Section 368(a) of the Internal Revenue Code; provided, however, in
the event that Metamor's counsel is unwilling to render an opinion the
condition will be satisfied if an opinion that is reasonably satisfactory to
Metamor is rendered by attorneys for PSINet. It is also a condition to the
completion of the merger that PSINet receive an opinion from its attorneys to
the effect that the merger will be treated as a reorganization within the
meaning of Section 368(a) of the Internal Revenue Code; provided, however, in
the event that PSINet's counsel is unwilling to render an opinion the condition
will be satisfied if an opinion that is reasonably satisfactory to PSINet is
rendered by attorneys for Metamor. Assuming the merger qualifies as a
reorganization within the meaning of Section 368(a) of the Internal Revenue
Code, holders of Metamor common stock will not recognize gain or loss for
United States federal income tax purposes as a result of the exchange of their
Metamor common stock for PSINet common stock in the merger, except with respect
to cash received instead of fractional shares of PSINet common stock.

   Tax matters are very complicated and the tax consequences of the merger to
you will depend on the facts of your own situation. You should consult your own
tax advisors for a full understanding of the tax consequences of the merger to
you.

Accounting Treatment (page 64)

   The merger will be accounted for as a "purchase" of Metamor by PSINet.

Regulatory Matters (page 64)

   United States antitrust laws prohibit PSINet and Metamor from completing the
merger until after they have furnished specified information and materials to
the Antitrust Division of the Department of Justice and the Federal Trade
Commission and a required waiting period has ended. PSINet and Metamor each
filed the required notification and report forms with the Antitrust Division
and the Federal Trade Commission on April 10, 2000, and early termination of
the waiting period was granted on April 26, 2000.

Boards of Directors Recommendations (pages 41 and 43)

   PSINet's board of directors believes that the terms of the merger and the
merger agreement are fair to and in the best interests of PSINet and its
shareholders and unanimously recommends that PSINet's shareholders vote "for"
the approval of the issuance of the PSINet common stock in connection with the
merger. Metamor's board of directors believes that the terms of the merger and
the merger agreement are fair to and in the best interests of Metamor and its
stockholders and unanimously recommends that Metamor's stockholders vote "for"
the adoption of the merger agreement.

   To review the background and reasons for the merger in greater detail, as
well as certain risks related to the merger, see the information beginning on
pages 38 and 19, respectively.

Fairness Opinions of Financial Advisors (pages 45 and 54)

   In deciding to approve the merger, PSINet's board of directors considered,
among other things, the opinion of its financial advisor, FleetBoston Robertson
Stephens Inc. (Robertson Stephens), dated March 21, 2000, to the effect that,
as of such date and based upon and subject to the various considerations set
forth in such opinion, the exchange ratio in connection with the merger is fair
to PSINet from a financial point of view.

                                       9
<PAGE>


This opinion is attached as Annex 2 to this document. The U.S. financial
markets have been volatile, particularly for technology companies, since March
21, 2000, so we encourage you to read this opinion carefully in its entirety
for a description of the assumptions made, matters considered and limitations
on the review undertaken. The opinion is not a recommendation to shareholders
of PSINet as to how they should vote with respect to the proposed issuance of
the PSINet common stock.

   In deciding to approve the merger, Metamor's board of directors considered,
among other things, the opinion of its financial advisor, Lazard Freres & Co.
LLC (Lazard), dated March 21, 2000, to the effect that, as of such date and
based upon and subject to the various considerations set forth in such opinion,
the exchange ratio in connection with the merger is fair to Metamor
stockholders from a financial point of view. This opinion is attached as Annex
3 to this document. The U.S. financial markets have been volatile, particularly
for technology companies, since March 21, 2000, so we encourage you to read
this opinion carefully in its entirety for a description of the assumptions
made, matters considered and limitations on the review undertaken. The opinion
is not a recommendation to stockholders of Metamor as to how they should vote
with respect to the proposed merger.

Interests of Metamor Directors and Management in the Merger (page 59)

   Metamor stockholders should note that a number of directors and officers of
Metamor have interests in the merger as directors or officers that are
different from, or in addition to, those of a Metamor stockholder. For a
description of these differences see pages 59 through 61.

Conditions to the Merger (page 66)

   PSINet and Metamor will complete the merger only if they satisfy or, in some
cases, waive several conditions, including the following:

  .  PSINet's shareholders must approve the issuance of the shares of PSINet
     common stock in connection with the merger at the PSINet special
     meeting;

  .  Metamor's stockholders must adopt the merger agreement at the Metamor
     special meeting;

  .  the waiting period required under applicable antitrust laws shall have
     expired or been terminated;

  .  Metamor's outstanding debt (including Metamor's 2.94% Convertible
     Subordinated Notes having a face amount of approximately $227 million
     and amounts due under Metamor's $80 million revolving credit facility of
     which $40.2 million was outstanding or committed as of April 25, 2000)
     must be paid or satisfied prior to the effectiveness of the merger, with
     funds to be provided by PSINet at the closing;

  .  the PSINet common stock issuable to Metamor stockholders in the merger
     and pursuant to the assumed Metamor options must have been approved for
     listing on The Nasdaq Stock Market;

  .  no court with appropriate jurisdiction has issued an order, judgment,
     decree, injunction or ruling which restrains, enjoins or prohibits the
     completion of the merger;

  .  the registration statement of which this document forms a part must
     remain effective;

  .  PSINet, PSINet Shelf IV Inc. and Metamor must satisfy the
     representations, warranties and covenants contained in the merger
     agreement with specified materiality qualifications; and

  .  each of PSINet and Metamor must have received the tax opinions described
     above.


                                       10
<PAGE>


Termination of the Merger Agreement (page 68)

   The merger agreement may be terminated for the following reasons:

   1. PSINet and Metamor can agree by mutual written consent to terminate the
merger agreement at any time without completing the merger.

  2. PSINet or Metamor can terminate the merger agreement if:

    .  the merger is not consummated on or before October 31, 2000 (unless
       the reason for the delay is a material breach under the merger
       agreement by the party seeking to terminate);

    .  the approvals required from the PSINet shareholders and Metamor
       stockholders are not obtained at the special meetings;

    .  any court issues any order or takes other legal action which
       permanently enjoins or prohibits the completion of the merger and,
       after reasonable efforts by PSINet and Metamor, the court's action is
       final and nonappealable; or

    .  the other party has breached in any material respect any of its
       representations, warranties or obligations under the merger agreement
       which causes one or more of the closing conditions to be incapable of
       being satisfied by October 31, 2000.

   3. Before the Metamor special meeting, Metamor can terminate the merger
agreement if Metamor's board of directors receives an unsolicited proposal by a
third party to acquire Metamor on terms determined by Metamor's board of
directors to be more favorable to Metamor stockholders than the terms of the
merger with PSINet. In the event that Metamor's board of directors decides to
accept a superior proposal, it must first give PSINet the opportunity to
negotiate and make adjustments to the terms of the merger agreement that would
enable PSINet to proceed with the merger.

   4. PSINet can terminate the merger agreement if Metamor's board of directors
withdraws or adversely modifies its approval or approves or recommends an
unsolicited third party proposal.

Non-Solicitation (page 67)

   In the merger agreement, Metamor has agreed not to discuss alternative
transactions to the merger with third parties, with specified exceptions
designed to preserve the Metamor board's right to exercise its fiduciary
duties.

   PSINet has agreed not to enter into any agreement that would expressly
prevent the merger or is conditioned upon the merger not occurring.

Termination Fees (page 68)

   Metamor must pay PSINet a termination fee of $45 million if:

   1. Metamor terminates the merger agreement in order to accept a more
favorable proposal or withdraws or modifies its approval or recommendation of
the merger in connection with the Metamor special meeting after receipt of a
more favorable proposal;

   2. PSINet terminates the merger agreement because Metamor's board of
directors approves or recommends a more favorable third party proposal;

   3. the merger agreement is terminated because holders of Metamor common
stock fail to adopt the merger agreement at the Metamor special meeting as it
may be adjourned from time to time, a third party

                                       11
<PAGE>

acquisition proposal is publicly disclosed prior to the completion of the
Metamor special meeting, and within 12 months after the termination Metamor
enters into a definitive agreement with any third party with respect to an
acquisition proposal or an acquisition proposal is consummated; or

   4. the merger agreement is terminated by PSINet based on a material breach
of the agreement by Metamor; by Metamor or PSINet if the closing of the merger
fails to occur by October 31, 2000; or by PSINet based on Metamor's withdrawal
or adverse modification of its recommendation of the merger agreement and, in
each case:

    .  there has been a third party acquisition proposal between the date of
       the merger agreement and the date of termination;

    .  following the existence of the acquisition proposal, prior to the
       termination, Metamor has intentionally breached in any material
       respect (and not cured) any of its material agreements under the
       merger agreement; and

    .  within 12 months of the termination Metamor enters into a definitive
       agreement relating to an acquisition proposal or an acquisition
       proposal is completed.

   PSINet must pay Metamor a termination fee of $45 million if:

   1. the PSINet shareholders have not approved the issuance of the PSINet
common stock at the PSINet special meeting as it may be adjourned from time to
time, and

   2. either

    .  prior to the PSINet special meeting, the board of directors of PSINet
       approved a bona fide written proposal or offer or entered into a
       definitive agreement with respect to the acquisition of PSINet or a
       majority interest in PSINet by another entity, or

    .  such a transaction is announced to the public at any time after the
       date of the merger agreement and prior to the PSINet special meeting
       and within 12 months following the final adjournment of the PSINet
       special meeting, PSINet enters into a definitive agreement with any
       third party with respect to the acquisition of PSINet or a majority
       interest in PSINet by any third party or such an acquisition by any
       third party is consummated.

                                       12
<PAGE>


          Comparative Per Share Market Price and Dividend Information

   PSINet common stock is listed for trading on The Nasdaq Stock Market under
the trading symbol "PSIX" and Metamor common stock is listed on The Nasdaq
Stock Market under the trading symbol "MMWW."

   The following table shows the closing prices for PSINet and Metamor shares
and the equivalent price per share of Metamor common stock based on the
exchange ratio on March 21, 2000, the last full trading day before the public
announcement of the proposed merger, and on May 11, 2000, the most recent date
for which quotations were available prior to the printing of this document.

<TABLE>
<CAPTION>
                                                                Equivalent price
                                               PSINet  Metamor     per share
                                               Common   Common     of Metamor
         Date                                  Stock    Stock     Common Stock
         ----                                 -------- -------- ----------------
      <S>                                     <C>      <C>      <C>
      March 21, 2000......................... $49.5000 $16.0000     $44.5500
      May 11, 2000...........................  25.8750  20.9375      23.2875
</TABLE>

   Neither Metamor nor PSINet has ever declared or paid any cash dividends on
its common stock. Except as required with respect to PSINet's preferred stock,
PSINet currently intends to retain all of its earnings, if any, for use in its
business and does not anticipate paying any cash dividends on its common stock
in the foreseeable future. In addition, PSINet's debt securities contain
limitations on its ability to declare and pay cash dividends.

   The following table sets forth, for the periods indicated, the high and low
sales prices per share of PSINet common stock and Metamor common stock on The
Nasdaq Stock Market. For current price information, stockholders are urged to
consult publicly available sources.

<TABLE>
<CAPTION>
                                               PSINet Common        Metamor
                                                   Stock         Common Stock
                                             ----------------- -----------------
              Calendar Period                  High     Low      High     Low
              ---------------                -------- -------- -------- --------
<S>                                          <C>      <C>      <C>      <C>
Year Ended December 31, 1998:
  First Quarter............................. $ 6.4375 $ 2.5000 $39.6250 $20.7500
  Second Quarter............................   7.6250   5.0000  39.2500  28.5000
  Third Quarter.............................  10.9688   5.0625  37.6250  22.0000
  Fourth Quarter............................  12.5313   4.1875  29.1250  17.8750
Year Ended December 31, 1999:
  First Quarter.............................  23.1250  10.5000  29.1250  12.8750
  Second Quarter............................  36.8750  17.3750  28.7500  12.5625
  Third Quarter.............................  32.6875  16.7500  25.3750  13.7500
  Fourth Quarter............................  35.2500  15.5312  41.6250  15.6875
Year Ending December 31, 2000:
  First Quarter.............................  60.9375  27.2500  35.7500  15.2500
  Second Quarter (through May 11, 2000).....  35.0000  18.1250  28.8750  15.0000
</TABLE>


                                       13
<PAGE>

             Unaudited Pro Forma Comparative Per Share Information

   We have summarized below information concerning earnings, cash dividends and
book value per share for:

  .  PSINet on a historical basis;

  .  Metamor on a historical basis;

  .  the combination of PSINet and Metamor on a pro forma basis; and

  .  the equivalent of one share of Metamor common stock, based on the
     exchange ratio of 0.9 of a share of PSINet common stock for each share
     of Metamor common stock.

   You should read the information set forth below in conjunction with the
audited financial statements of Metamor and PSINet incorporated by reference in
this document and the unaudited condensed combined consolidated financial
information and related notes presented elsewhere in this document. See "Where
You Can Find More Information" and "Unaudited Pro Forma Condensed Combined
Financial Information."

<TABLE>
<CAPTION>
                                                                 Equivalent of
                                   PSINet    Metamor              One Metamor
                                 Historical Historical Pro Forma     Share
                                 ---------- ---------- --------- -------------
     <S>                         <C>        <C>        <C>       <C>
     Fiscal year ended December
      31, 1999:
       Basic earnings per
        share...................   (3.49)      0.96      (3.45)      (3.11)
       Diluted earnings per
        share...................   (3.49)      0.96      (3.45)      (3.11)
       Cash dividends declared
        per share...............       0          0          0           0
       Book value per share.....    4.93      13.26      16.08       14.47
</TABLE>

                                       14
<PAGE>


  PSINet Summary Unaudited Pro Forma Condensed Combined Financial Information
       (In millions of U.S. dollars, except share and per share amounts)

   The following Summary Unaudited Pro Forma Condensed Combined Financial
Information of PSINet gives pro forma effect to the merger as well as to other
transactions, as more fully discussed under "Unaudited Pro Forma Condensed
Combined Financial Information," as if they had occurred on January 1, 1999 for
the statement of operations data and on December 31, 1999 for the balance sheet
data.

   If PSINet had actually completed the merger in prior periods, Metamor might
have performed differently. You should not rely on the pro forma financial
information as an indication of the results that PSINet would have achieved if
the merger had taken place earlier or of the future results that the companies
will achieve after completion of the merger. For further information concerning
the following summary pro forma financial information, including the
adjustments made in preparing it, please refer to "Unaudited Pro Forma
Condensed Combined Financial Information" incorporated by reference into this
document.
<TABLE>
<CAPTION>
                                                                     Pro Forma
                                                                     Year Ended
                                                                    December 31,
                                                                        1999
                                                                    ------------
<S>                                                                 <C>
Combined Statement of Operations Data:
Internet access revenue...........................................    $  758.8
Services revenue..................................................       577.0
                                                                      --------
    Total revenue.................................................     1,335.8
Operating costs and expenses:
  Data communications and operations..............................       523.4
  Cost of services revenue........................................       341.0
  Selling, general and administrative.............................       403.2
  Depreciation and amortization...................................       350.1
  Charge for acquired in-process R&D..............................        88.7
                                                                      --------
    Total operating costs and expenses............................     1,706.4
                                                                      --------
Loss from operations..............................................      (370.6)
Interest expense..................................................      (196.2)
Interest income...................................................        56.0
Other income, net.................................................         1.1
                                                                      --------
Loss from continuing operations before income taxes...............      (509.7)
Income tax benefit (expense)......................................         --
                                                                      --------
Loss from continuing operations...................................      (509.7)
Return to preferred shareholders..................................       (55.8)
                                                                      --------
Loss from continuing operations available to common shareholders..    $ (565.5)
                                                                      ========
Basic and diluted loss per share from continuing operations.......    $  (3.45)
                                                                      ========
Shares used in computing basic and diluted loss per share from
 continuing operations
 (in thousands)...................................................     163,765
                                                                      ========
<CAPTION>
                                                                     Pro Forma
                                                                       As of
                                                                    December 31,
                                                                        1999
                                                                    ------------
<S>                                                                 <C>
Combined Balance Sheet Data:
Cash, cash equivalents, short-term investments and marketable se-
 curities.........................................................    $2,261.9
Restricted cash and short-term investments........................       154.1
Total assets......................................................     7,142.9
Current portion of debt...........................................       115.0
Long-term debt, less current portion..............................     3,394.4
Shareholders' equity..............................................     2,991.6
</TABLE>


                                       15
<PAGE>


         PSINet Summary Consolidated Financial and Operating Data

   The following table sets forth for the periods indicated summary
consolidated financial and operating data for PSINet. The consolidated balance
sheet data, consolidated statement of operations data and consolidated cash
flow data as of and for the years ended December 31, 1995, 1996, 1997, 1998 and
1999 have been derived from PSINet's audited consolidated financial statements.
In 1998 and 1999, PSINet acquired a significant number of businesses, including
Transaction Network Services, Inc. (TNI), acquired a significant amount of
global fiber optic bandwith, issued a significant amount of debt and equity
and, in 1998, incurred a non-recurring arbitration charge. In 1996 PSINet sold
its individual subscriber accounts and certain related assets and in 1997 it
sold its software subsidiary. These transactions affect the comparability of
PSINet's financial position, results of operations and cash flows for those
years. The following summary consolidated financial and operating data should
be read in conjunction with PSINet's more detailed consolidated financial
statements and related notes incorporated by reference into this document.

   The following information gives effect to a two-for-one stock split of
PSINet's common stock, effected in the form of a stock dividend on February 11,
2000, to holders of record as of the close of business on January 28, 2000.

   EBITDA is used in the Internet services industry as one measure of a
company's operating performance and historical ability to service debt. EBITDA
is not determined in accordance with generally accepted accounting principles,
is not indicative of cash used by operating activities and should not be
considered in isolation or as an alternative to, or more meaningful than,
measures of performance determined in accordance with generally accepted
accounting principles. PSINet defines EBITDA as earnings (losses) before
interest expense and interest income, taxes, depreciation and amortization,
other non-operating income and expenses, charge for acquired in-process
research and development, restructuring charge and costs related to the planned
distribution or sale of its consumer business. PSINet's definition of EBITDA
may not be comparable to similarly titled measures used by other companies.

Exchange of Series C Preferred Stock

   In February and March 2000, PSINet exchanged 8,155,192 newly issued shares
of its common stock for an aggregate of 4,629,335 shares of its outstanding
Series C preferred stock through individually negotiated transactions with a
limited number of holders of its Series C preferred stock. The implied premium
of approximately $1.7 million incurred in connection with the exchanges, net of
cash to be received from the deposit account relating to the exchanged shares,
will be recognized as a return to preferred shareholders in the first quarter
of 2000. Subsequent to the exchange, PSINet converted the exchanged Series C
preferred stock into 7,422,675 shares of its common stock, which is held as
treasury stock.

Issuance of Convertible Series D Preferred Stock

   In February 2000, PSINet completed an offering of 16,500,000 shares of 7%
Series D cumulative convertible preferred stock for aggregate net proceeds of
approximately $740.2 million after expenses (excluding amounts paid by the
purchasers of the Series D preferred stock into a deposit account established
for the benefit of the holders of the Series D preferred stock). The Series D
preferred stock has a liquidation preference of $50 per share.


                                       16
<PAGE>


<TABLE>
<CAPTION>
                                       Year Ended December 31,
                                -----------------------------------------
                                 1995    1996    1997    1998      1999
                                ------  ------  ------  -------  --------
                                (In millions of U.S. dollars, except
                                               share,
                                    per share and operating data)
<S>                             <C>     <C>     <C>     <C>      <C>       <C>
Consolidated Statement of
 Operations Data:
Revenues:
 U.S........................... $ 36.2  $ 77.6  $104.0  $ 156.0  $  270.6
 International.................    2.5     6.8    17.9    103.6     284.1
                                ------  ------  ------  -------  --------
                                  38.7    84.4   121.9    259.6     554.7
 Other income, net.............    --      5.4     --       --        --
                                ------  ------  ------  -------  --------  ---
                                  38.7    89.8   121.9    259.6     554.7

Operating costs and expenses:
 Data communications and
  operations...................   32.1    70.1    94.4    199.4     396.4
 Sales and marketing...........   23.9    27.1    25.8     57.0     103.8
 General and administrative....   10.6    20.7    23.0     45.3      78.7
 Depreciation and
  amortization.................   14.8    28.0    28.3     63.4     166.5
 Charge for acquired in-
  process research and
  development..................    --      --      --      70.8      88.7
 Intangible asset write-down...    9.9     --      --       --        --
                                ------  ------  ------  -------  --------  ---
   Total operating costs and
    expenses...................   91.3   145.9   171.5    435.9     834.1
                                ------  ------  ------  -------  --------  ---
Loss from operations...........  (52.6)  (56.1)  (49.6)  (176.3)   (279.4)
Interest expense...............   (2.0)   (5.0)   (5.4)   (63.9)   (193.1)
Non-recurring arbitration
 charge........................    --      --      --     (49.0)      --
Loss before income taxes.......  (53.2)  (55.3)  (46.1)  (262.7)   (419.0)
Net loss.......................  (53.2)  (55.1)  (45.6)  (261.8)   (416.2)
Return to preferred
 shareholders..................    --      --     (0.4)    (3.1)    (17.7)
Net loss available to common
 shareholders.................. $(53.2) $(55.1) $(46.0) $(264.9) $ (433.9)
                                ======  ======  ======  =======  ========
Basic and diluted loss per
 share......................... $(1.01) $(0.70) $(0.57) $ (2.66) $  (3.49)
                                ======  ======  ======  =======  ========
Shares used in computing basic
 and diluted loss per shares
 (in thousands)................ 52,970  78,756  80,612   99,612   124,386
                                ======  ======  ======  =======  ========
Other Financial Data:
EBITDA:
 U.S........................... $(26.9) $(20.5) $(13.1) $ (26.2) $  (39.4)
 International.................   (1.0)   (7.5)   (8.1)   (15.9)     15.2
                                ------  ------  ------  -------  --------
                                $(27.9) $(28.0) $(21.2) $ (42.1) $  (24.2)
                                ======  ======  ======  =======  ========
Capital expenditures........... $ 45.2  $ 38.4  $ 50.1  $ 303.6  $  832.8
Consolidated Cash Flow Data:
Cash flows used in operating
 activities.................... $(30.1) $(32.5) $(15.6) $ (87.6) $ (157.8)
Cash flows used in investing
 activities....................  (22.0)   (7.9)  (15.6)  (783.9) (1,558.6)
Cash flows provided by (used
 in) financing activities......  151.4   (10.5)   12.6    874.2   2,520.3
Operating Data:
Number of POPs.................    241     350     350      500       900
Number of business customers
 accounts......................  8,200  17,800  26,400   54,700    91,000
Number of consumer customer
 accounts...................... 75,000       0   5,300  225,000   562,000


<CAPTION>
                                            December 31,
                                -----------------------------------------
                                 1995    1996    1997    1998      1999
                                ------  ------  ------  -------  --------
                                    (In millions of U.S. dollars)
<S>                             <C>     <C>     <C>     <C>      <C>       <C>
Consolidated Balance Sheet
 Data:
Cash, cash equivalent, short-
 term investments and
 marketable securities......... $102.7  $ 56.4  $ 33.3  $ 322.5  $1,601.2
Restricted cash and short-term
 investments...................    --      0.9    20.7    162.5     154.1
Total assets...................  201.8   177.1   186.2  1,284.2   4,492.3
Current portion of debt........   16.6    26.9    39.6     60.0     115.0
Long-term debt, less current
 portion.......................   24.1    26.9    33.8  1,064.6   3,185.2
Shareholders' equity
 (deficit).....................  143.2    89.8    73.4   (120.2)    723.0
</TABLE>


                                       17
<PAGE>



                Metamor Summary Consolidated Financial Data

   The following table sets forth for the periods indicated summary
consolidated financial data for Metamor. The summary consolidated financial
data as of and for the years ended December 31, 1995, 1996, 1997, 1998 and 1999
have been derived from Metamor's audited consolidated financial statements and
have been restated to present as discontinued operations Metamor's staffing
services business, which was sold during the third quarter of 1998, and its
software solutions and project support units, which were sold in the third
quarter of 1999. The extraordinary loss during 1996 of $1.4 million ($0.9
million after income taxes) related to the write-off of deferred loan costs of
a revolving credit facility that was extinguished in November 1996. The
following summary consolidated financial data should be read in conjunction
with Metamor's more detailed consolidated financial statements and related
notes incorporated by reference in this document.


<TABLE>
<CAPTION>

                                         Year Ended December 31,
                               ------------------------------------------------
                                 1995      1996      1997      1998      1999
                               --------  --------  --------  --------  --------
                               (In thousands of U.S. dollars, except share
                                           and per share data)
<S>                            <C>       <C>       <C>       <C>       <C>
Consolidated Statement of
 Operations Data:
Revenue from services........  $ 11,572  $ 30,089  $134,343  $341,174  $576,997
Cost of services.............     8,277    21,537    85,640   201,415   340,973
                               --------  --------  --------  --------  --------
Gross profit.................     3,295     8,552    48,703   139,759   236,024
Operating costs and
 expenses....................     6,033    11,509    39,059   100,552   200,341
                               --------  --------  --------  --------  --------
Operating income (loss)......    (2,738)   (2,957)    9,644    39,207    35,683
Interest expense and other...      (575)     (237)   (1,872)   (6,722)  (18,547)
                               --------  --------  --------  --------  --------
Income (loss) from continuing
 operations before income
 taxes.......................    (3,313)   (3,194)    7,772    32,485    17,136
Provision (benefit) for
 income taxes................    (1,399)     (753)    3,267    13,644     6,952
                               --------  --------  --------  --------  --------
Income (loss) from continuing
 operations..................    (1,914)   (2,441)    4,505    18,841    10,184
Income from discontinued
 operations..................     8,271    19,835    22,298    46,950    22,379
                               --------  --------  --------  --------  --------
Income before extraordinary
 loss........................     6,357    17,394    26,803    65,791    32,563
Extraordinary loss...........       --       (940)      --        --        --
                               --------  --------  --------  --------  --------
Net income...................  $  6,357  $ 16,454  $ 26,803  $ 65,791  $ 32,563
                               ========  ========  ========  ========  ========

Diluted earnings per share...
 Income (loss) from
  continuing operations......  $  (0.13) $  (0.08) $   0.14  $   0.56  $   0.30
 Income from discontinued
  operations.................      0.42      0.65      0.68      1.32      0.66
 Extraordinary loss..........       --      (0.03)      --        --        --
                               --------  --------  --------  --------  --------
Net income...................  $   0.29  $   0.54  $   0.82  $   1.88  $   0.96
                               ========  ========  ========  ========  ========

Number of shares used in
 computing diluted earnings
 per share (in thousands)....    19,715    30,365    32,608    38,665    34,093

<CAPTION>

                                               December 31,
                               ------------------------------------------------
                                 1995      1996      1997      1998      1999
                               --------  --------  --------  --------  --------
                                      (In thousands of U.S. dollars)
<S>                            <C>       <C>       <C>       <C>       <C>
Consolidated Balance Sheet
 Data:
Working capital..............  $  1,206  $  9,251  $ 25,526  $  8,127  $183,703
Total assets.................   124,281   347,999   547,473   703,668   971,809
Long-term debt, net of
 current maturities..........    43,312   107,822   246,883   238,076   209,193
Stockholders' equity.........    75,165   230,917   262,597   338,745   458,155
</TABLE>


                                       18
<PAGE>

                                  RISK FACTORS

   In addition to the other information included and incorporated by reference
in this proxy statement/prospectus, investors should consider carefully the
matters described below in determining whether to approve the issuance of the
PSINet common stock or adopt the merger agreement.

Risk Factors Relating to the Merger

The exchange ratio for Metamor common stock to be acquired in the merger is
fixed and will not be adjusted if there is any change in stock price

   Under the merger agreement, each share of Metamor common stock will be
converted into the right to receive 0.9 of a share of PSINet common stock. This
exchange ratio is a fixed number and will not be adjusted if there is any
increase or decrease in the price of PSINet common stock or Metamor common
stock. The closing price of PSINet's common stock has declined from $49.50 per
share on the day prior to the announcement of the proposed merger to $25.875 on
May 11, 2000. The prices of PSINet common stock and Metamor common stock at the
closing of the merger may vary from their respective prices on the date of this
document and on the date of the special meetings. These prices may vary because
of changes in the business, operations or prospects of PSINet or Metamor,
market assessments of the likelihood that the merger will be completed, the
timing of the completion of the merger, the prospects of post-merger
operations, regulatory considerations, general market and economic conditions
and other factors. Although we expect the merger to be completed on the date of
the special meetings, it may be completed on a later date and the prices of
PSINet common stock and Metamor common stock on the date of the special
meetings may not be indicative of their respective prices on the date the
merger is completed.

PSINet may face difficulties in integrating Metamor's business into PSINet's
business

   PSINet and Metamor entered into the merger agreement with the expectation
that integrating Metamor's IT solutions business with PSINet's technology in
Internet connectivity, Web hosting and eCommerce and its suite of value-added
products and services designed to maximize utilization of the Internet will
present a significant opportunity to create a combined organization that will
be a leader in providing global eCommerce and Internet solutions to businesses.
PSINet's ability to create such a combined organization will be subject to
risks associated with acquisitions including difficulties in integrating
combined operations, the potential disruption of operations and the related
negative impact on earnings and the incurrence of substantial expenses that
could adversely affect its financial condition. PSINet intends to integrate
Metamor's business into PSINet. Achieving the anticipated benefits of the
merger will depend in large part upon whether the integration of Metamor's
business into PSINet is accomplished in an efficient and effective manner. The
integration of Metamor's business into PSINet will require, among other things,
integration of the products and services, technologies, distribution channels,
management information systems and key personnel of Metamor's business into
PSINet. Neither PSINet nor Metamor can assure you that the integration of
Metamor's business will be accomplished in an efficient and effective manner,
if at all. If significant difficulties are encountered in the integration, it
could have a material adverse effect on the business, results of operations and
financial condition of PSINet.

   The integration of operations and technologies following the merger will
require the dedication of management and other personnel which may distract
their attention from the day-to-day businesses of PSINet and Metamor,
development or acquisition of new products, services and technologies, and the
pursuit of other business acquisition opportunities. The difficulties of
integrating PSINet and Metamor may be increased by the necessity of
coordinating organizations with distinct cultures and widely disbursed
operations. Successful integration of the two companies' sales and marketing
organizations will require the sales and marketing personnel of each company to
learn about the often technically-complex products, services and technologies
of the other company.


                                       19
<PAGE>


   In addition, successful combination of the PSINet and Metamor businesses
will be dependent at least in part on the retention and integration of the key
management, sales, marketing and engineering and other technical employees of
Metamor's business into PSINet. Competition for qualified personnel in the IT
solutions industry is intense and competitors often use aggressive tactics to
recruit key employees during the period leading up to a merger and during the
integration phase following a merger. While each of PSINet and Metamor is
engaged in ongoing efforts to retain key employees, it may be more difficult
for PSINet to retain such employees after the merger. In particular, in
connection with the closing of the merger, approximately 540,000 unvested
Metamor stock options held by employees of Metamor will vest (representing
15.7% of the total unvested stock options of Metamor held by its employees). In
addition, 620,000 unvested Xpedior stock options held by employees of Metamor
will vest in connection with the merger. The acceleration of these options
could potentially reduce the retention incentive to Metamor employees provided
by the options. Neither PSINet nor Metamor can assure you that Metamor
employees will remain with PSINet. The loss of services of key employees of
Metamor could have a material adverse effect on the business, results of
operations and financial condition of PSINet.

The price of PSINet common stock may be affected by factors different from
those affecting the price of Metamor common stock

   Upon completion of the merger, holders of Metamor common stock will become
holders of PSINet common stock. PSINet's business differs from that of Metamor,
and PSINet's results of operations, as well as the price of PSINet common
stock, may be affected by factors different from those that have affected the
price of Metamor common stock. For a discussion of PSINet's and Metamor's
businesses and other factors to consider, see PSINet's Annual Report on Form
10-K for the year ended December 31, 1999, and Metamor's Annual Report on Form
10-K for the year ended December 31, 1999, which are incorporated by reference
in this document.

Risk Factors Relating to PSINet

PSINet had approximately $3.3 billion of indebtedness as of December 31, 1999,
which could restrict its operations and make it susceptible to economic
downturns

   At December 31, 1999, PSINet's total indebtedness was $3.3 billion. Its
annual interest expense increased from $63.9 million in 1998 to $193.1 million
in 1999. PSINet estimates that its annual interest expense for the year 2000
will be approximately $363.5 million, assuming that it does not incur any
additional indebtedness or refinance existing indebtedness.

   If PSINet is unable to generate sufficient cash from operations to service
its indebtedness, it will be adversely affected. PSINet historically has been
unable to generate sufficient cash flow from operations to meet its operating
needs and has relied upon financings to fund its operations. PSINet cannot
assure you that its business will generate cash flow from operations, or that
future financings will be available, sufficient to fund its operations or
satisfy its debt service or working capital requirements. PSINet's leverage
could adversely affect its ability to obtain additional financing for working
capital, acquisitions or for other purposes. Such leverage could make it more
susceptible to economic downturns, contractions in the general market
availability of equity or debt financing and competitive pressures. PSINet's
leverage could also affect its liquidity as a substantial portion of available
cash from operations must be applied to debt service requirements. In the event
of a cash short-fall, PSINet could be forced to reduce expenditures or forego
potential acquisitions and other elements of its business plan to meet such
requirements.

PSINet may continue to incur substantial losses

   Although revenue has increased each year from $84.4 million in 1996 to
$554.7 million in 1999, PSINet had net losses available to common shareholders
of $55.1 million, $46.0 million, $264.9 million and $433.9 million, and had
negative EBITDA of $28.0 million, $21.2 million, $42.1 million and $24.2
million, for each

                                       20
<PAGE>

of the years ended December 31, 1996, 1997, 1998 and 1999, respectively. PSINet
may continue to have losses and negative EBITDA as it continues its acquisition
program and expansion of its global network operations.

   Factors that cause PSINet's operating results to fluctuate include:

  .  general economic conditions and specific economic conditions in the
     Internet access industry;

  .  user demand for Internet services;

  .  timing and amount of capital expenditures, other costs and expenses of
     expanding its network;

  .  pricing changes, new product and new service introductions by it and its
     competitors;

  .  the mix of services sold and the mix of channels through which those
     services are sold;

  .  delays in obtaining sufficient supplies or inability to obtain
     sufficient equipment from limited sources and telecom facilities; and

  .  potential adverse legislative and regulatory developments.

   As a strategic response to a changing competitive environment, PSINet may
elect from time to time to make pricing, service or marketing decisions that
could have a material adverse effect on its business, results of operations and
cash flow. As a result of these factors, PSINet may continue to generate net
losses and negative EBITDA.

The terms of PSINet's financing arrangements may restrict the operations of
PSINet and its subsidiaries

   PSINet's financing arrangements with its equipment lessors are secured by
some of its assets. These financing arrangements require that PSINet satisfy
many financial covenants. PSINet's ability to satisfy these financial covenants
may be affected by events beyond its control. As a result, PSINet cannot assure
you that it will be able to continue to satisfy such covenants. Some of
PSINet's indentures also currently prohibit it from paying dividends and
repurchasing its capital stock without consent. PSINet's failure to comply with
covenants and restrictions could lead to a default under the terms of these
agreements. In the event of a default under these financing arrangements, its
lenders would be entitled to accelerate the outstanding indebtedness and
foreclose upon any assets securing that indebtedness. Lenders would also be
entitled to be repaid from the proceeds of the liquidation of those assets
before the assets would be available for distribution to the holders of its
securities.

   Upon completion of the merger, PSINet will control a majority of the voting
power of Xpedior. As a result, Xpedior will become subject to restrictions on
subsidiaries imposed by PSINet's four indentures unless PSINet takes prescribed
action to cause Xpedior to be designated as a subsidiary that is not subject to
those restrictions. The indenture restrictions, if applicable, would limit
Xpedior's ability to incur indebtedness, issue preferred stock having specified
features, make restricted payments including dividends and other distributions,
create liens, sell assets or enter into certain mergers, consolidations and
acquisitions. Xpedior would be free of the indenture restrictions if PSINet
designated it as an "unrestricted subsidiary," if it obtained the consent of a
majority in principal amount of noteholders under each of the indentures or if
PSINet reduced its ownership of Xpedior voting shares to less than a majority.
PSINet is considering various alternatives that would permit Xpedior to be free
of the indenture restrictions.

PSINet partially depends on the cash flows of its subsidiaries in order to
satisfy its debt obligations

   PSINet's operating cash flow and consequently its ability to service its
debt is partially dependent upon the ability of its subsidiaries to distribute
their earnings to it in the form of dividends. PSINet also depends on loans,
advances or other payments of funds to it by its subsidiaries. If for some
reason these funds were restricted, PSINet would be adversely affected.
PSINet's subsidiaries are separate legal entities and have no obligation,
contingent or otherwise, to pay any amount due pursuant to its financing
commitments or to make

                                       21
<PAGE>

any funds available for that purpose. PSINet's subsidiaries' ability to make
payments may be subject to the availability of sufficient surplus funds, the
terms of such subsidiaries' financings, applicable law and other factors.
PSINet's subsidiaries' creditors generally will have priority to the assets of
those subsidiaries over the claims, if any, that PSINet may have against those
assets and claims that holders of PSINet's indebtedness may indirectly have.

The growth of PSINet's eCommerce and Web hosting business is subject to a
number of risks and uncertainties

   To successfully implement its business plan, PSINet must continue to grow
its Internet and eCommerce hosting business. In order to do so, PSINet will
need to locate and build Internet and eCommerce hosting centers. PSINet cannot
assure you that it can locate suitable sites to build these centers along a
fiber path on a cost-effective basis. If PSINet locates suitable sites, it will
be subject to construction risks, such as cost overruns and delays, and
possible difficulty in obtaining the hardware and telecommunications
connectivity necessary to make the Internet and eCommerce hosting centers
operational. Also, once completed, PSINet could experience difficulties in
filling these centers to break even profit capacity. Given the growing
competition in PSINet's industry, speed to market is a critical issue. To the
extent PSINet experiences difficulties, delays and unexpected costs, it may be
adversely affected.

PSINet may not be able to integrate acquired businesses and may not be able to
acquire businesses in the future

   During the two years ended December 31, 1999, PSINet acquired TNI and 60
ISPs and related businesses for aggregate purchase prices and related payments
of approximately $1.4 billion exclusive of assumed debt. In order to
successfully integrate these businesses into PSINet's own existing business,
PSINet needs to expand and refine its management, personnel, accounting,
information systems and other resources.

   If PSINet does not effectively expand its capabilities and deploy its
resources to meet these needs, its business may be disrupted and adversely
affected. Other risks include:

  .  possible inability of management to incorporate licensed or acquired
     technology and rights into PSINet's service offering; and

  .  possible impairment of relationships with employees, customers and
     suppliers as a result of changes in management.

   PSINet cannot assure you that it will be successful in overcoming these
risks or other problems encountered in connection with acquisitions, strategic
alliances or investments it makes in other companies. PSINet believes that
after eliminating redundant network architecture and administrative functions
and taking other actions to integrate the operations of acquired companies it
will be able to realize cost savings. However, although PSINet has assembled
teams to help it integrate the businesses that it acquires, it cannot assure
you that the integration process will be successfully accomplished. PSINet may
take charges or make adjustments to the depreciable lives of its assets as it
integrates acquired companies and also seeks to reduce its cost structure.
PSINet's inability to improve the operating performance of businesses it
acquires or to integrate successfully the operations of those companies could
have a material adverse effect on it. In addition, as PSINet proceeds with
acquisitions in which the consideration consists of cash, a substantial portion
of its available cash may be used for those purposes.

   The purchase price of many of the businesses that might become attractive
acquisition candidates for PSINet likely will significantly exceed the fair
values of the net assets of the acquired businesses. As a result, material
goodwill and other intangible assets would be required to be recorded which
would result in significant amortization charges in future periods.


                                       22
<PAGE>

   In addition, an intangible asset that frequently arises in connection with
the acquisition of a technology company is "acquired in-process research and
development," which under present U.S. accounting standards must be expensed
immediately upon acquisition. Such expenses, in addition to the financial
impact of acquisitions, could have a material adverse effect on it and could
cause substantial fluctuations in its quarterly and yearly operating results.
During 1999, PSINet recorded $88.7 million of charges for acquired in-process
research and development in connection with three acquisitions. Furthermore, in
connection with acquisitions or strategic alliances, PSINet could incur
substantial expenses including the expenses of integrating the business of the
acquired company or the strategic alliance with its existing business.

   Although PSINet has been successful to date in identifying acquisition
candidates at prices it considers to be reasonable, it cannot assure you that
this will continue. PSINet expects that competition for appropriate acquisition
candidates may be significant. It may compete with other telecommunications
companies with similar acquisition strategies, many of which may be larger and
have greater resources than it has. Competition for Internet companies is based
on a number of factors including price, terms and conditions, size and access
to capital, ability to offer cash, stock or other forms of consideration and
other matters. PSINet cannot assure you that it will be able to successfully
identify and acquire suitable companies on acceptable terms and conditions.

   If PSINet does not effectively expand its capabilities and deploy its
resources to meet these needs, its business may be disrupted and adversely
affected.

PSINet's growth and expansion may strain its ability to manage its operations
and its financial resources

   PSINet's rapid growth has placed a strain on its administrative, operational
and financial resources and has increased demands on its systems and controls.
PSINet has more than 900 points of presence (POPs) and it plans to continue to
expand the capacity of existing POPs as customer-driven demand dictates. In
addition, PSINet has completed a number of acquisitions of companies and
telecommunications bandwidth during 1998 and 1999 and plans to continue to do
so. The process of consolidating the businesses and implementing the strategic
integration of acquired businesses with PSINet's existing business may take a
significant amount of time. It may also place additional strain on PSINet's
resources and could subject it to additional expenses. PSINet cannot assure you
that its existing operating and financial control systems and infrastructure
will be adequate to maintain and effectively monitor its growth. PSINet's
continued growth and personnel turnover may also increase its need for
qualified personnel. PSINet cannot assure you that it will be successful in
attracting, integrating and retaining qualified personnel.

PSINet's success depends on providing increasing bandwidth to carry more
information faster than its competitors, which is expensive, requires it to
make significant future commitments and depends on technology that can become
obsolete quickly

   At December 31, 1999, PSINet was obligated to make future cash payments
totaling $388.9 million for acquisitions of global fiber-based and satellite
telecommunications bandwidth, including indefeasible rights of use (IRUs) or
other rights. In addition, if certain additional fiber-based bandwidth is
delivered as expected in 2001, PSINet will have additional payment obligations
ranging from $120.0 to $180.0 million, depending on when the bandwidth is
delivered. PSINet also expects that there will be additional costs, such as
connectivity and equipment charges to take full advantage of this acquired
bandwidth and IRUs. Some of this fiber-based and satellite telecommunications
bandwidth may require acquisition and installation of equipment necessary to
access and light the bandwidth in order to make it operational. PSINet
anticipates making significant investments to acquire and build-out new
Internet and eCommerce hosting centers in key financial and business centers
throughout the world and to purchase other facilities. PSINet currently
anticipates that capital expenditures will be approximately $1.5 billion for
the year ending December 31, 2000. Additionally, in connection with its awards
of external and local wireless licenses in Hong Kong, PSINet has committed to
invest approximately $385.8 million to build a next generation IP network in
Hong Kong. If PSINet cannot continue to provide bandwidth, its business will
suffer.

                                       23
<PAGE>

In order to compete effectively PSINet needs to continually develop new
products and services that gain market acceptance and keep the confidence of
its customers

   PSINet has introduced new enterprise service offerings, including value-
added, IP-based enterprise communication services and DSL-based Internet access
services. The failure of these services, particularly DSL-based services, to
gain market acceptance in a timely manner could have an adverse effect on
PSINet. To the extent that new or enhanced services are introduced and are not
reliable, or there are quality or compatibility problems, it could negatively
impact market acceptance of such services and adversely affect PSINet's ability
to attract or retain customers and subscribers. PSINet's services may contain
undetected errors or defects that could result in additional development or
remediation costs and loss of credibility with its customers and subscribers.

   Additionally, if PSINet is unable to meet customer demand for network
capacity, its network could become congested during peak periods. Congestion
could adversely affect the quality of service it is perceived to provide.
Conversely, due to the high fixed cost nature of its infrastructure, if
PSINet's network is under- utilized, it could adversely affect its ability to
provide cost-efficient services. PSINet's failure to match network capacity to
demand could have an adverse effect on it.

If PSINet does not continue to expand internationally, its business may suffer

   A key component of PSINet's business strategy is its continued expansion
into international markets. Revenue from PSINet's non-U.S. operations continues
to increase as a percentage of consolidated results, comprising 51% of revenue
for 1999. By comparison, PSINet's non-U.S. operations comprised 40% of revenue
for all of 1998. As a result of PSINet's acquisition of TNI, its revenue mix
will likely change again in 2000 because TNI's revenues are derived primarily
from U.S. operations. PSINet may need to enter into joint ventures or other
strategic relationships with one or more third parties in order to conduct its
foreign operations successfully. To the extent that PSINet cannot do so, its
business may be adversely affected. In addition, there are a number of risks
involved with doing business abroad including:

  .  unexpected changes in or delays resulting from foreign laws, regulatory
     requirements, tariffs, customs, duties and other trade barriers;

  .  difficulties in staffing and managing foreign operations;

  .  longer payment cycles and problems in collecting accounts receivable;

  .  fluctuations in currency exchange rates and foreign exchange controls
     which restrict or prohibit repatriation of funds;

  .  technology export and import restrictions;

  .  delays resulting from customs brokers or government agencies;

  .  seasonal reductions in business activity during the summer months in
     Europe and other parts of the world; and

  .  potentially adverse tax consequences, which could adversely impact the
     success of PSINet's international operations.

   Asia-Pacific and Latin American countries in which PSINet operates have
experienced economic difficulties and uncertainties during the past few years.
Economic difficulties and uncertainties in varying regions of the world could
also adversely affect PSINet.

The loss of key management personnel could have a material adverse effect on
PSINet

   PSINet's success is highly dependent upon the personal abilities of its
senior executive management, which includes its Chairman of the Board and Chief
Executive Officer and founder and its President and Chief

                                       24
<PAGE>

Operating Officer. PSINet has employment agreements with both of these senior
executive officers. The loss of the services of key management personnel could
have a material adverse effect on PSINet.

   PSINet experiences personnel turnover from time to time. Three of PSINet's
financial and accounting executives recently have taken positions with other
companies. PSINet has filled the positions on an interim basis while it is
actively recruiting to fill these positions permanently. It does not expect the
departure of these executives to have a material adverse effect on it. The
transition of financial and accounting management could result in some
disruption to PSINet's ongoing operations. If PSINet fails to complete this
transition in a timely manner, its financial and accounting systems and
operations may suffer.

PSINet could be adversely affected by changes in suppliers or delays in
delivery of their products and services

   From time to time, PSINet is dependent on third party suppliers for its
leased-line connections, or bandwidth, and some hardware components. Some of
these suppliers are or may become competitors. To the extent these suppliers
increase prices, PSINet may be adversely affected. Moreover, any failure or
delay on the part of PSINet's network providers to deliver bandwidth to it or
to provide operations, maintenance and other services with respect to such
bandwidth in a timely or adequate fashion could adversely affect PSINet.

   In the case of hardware suppliers, although PSINet attempts to maintain a
minimum of two vendors for each required product, it is not always able to do
so. Some components that PSINet uses to provide networking services are
currently supplied only by one source. PSINet has from time to time experienced
delays in the receipt of hardware components and telecommunications facilities,
including delays in delivery of Primary Rate Interface telecommunications
facilities, which connect its dial-up customers to its network. A failure by a
supplier to deliver products and services on a timely basis, or the inability
to develop alternative sources for such products and services, could adversely
affect PSINet's business.

   Recent legislative and regulatory actions may affect the prices that PSINet
is charged by the regional bell operating companies and other bandwidth
carriers, which could adversely affect PSINet's business.

PSINet's network is susceptible to failure, shutdown and disruption

   PSINet has implemented many network security measures, such as limiting
physical and network access to its routers. Nonetheless, PSINet's network
infrastructure is potentially vulnerable to computer viruses, break-ins,
denials of service and similar disruptive problems that could lead to
interruptions in service to its customers. Third parties could also potentially
jeopardize the security of confidential information stored in the computer
systems of PSINet's customers. Any one of these disruptions could deter
potential customers, result in loss of customer confidence and adversely affect
PSINet's existing customer relationships. PSINet also cannot assure you that it
will not experience failures or shutdowns relating to individual POPs or even
catastrophic failure of the entire network, whether because of an "act of God"
or otherwise.

   These disruptions may also result in claims against PSINet or liability to
it. Such claims, regardless of their ultimate outcome, could result in costly
litigation and could have an adverse effect on PSINet or its reputation or on
its ability to attract and retain customers for its products.

PSINet may be liable for information distributed on its network

   The law relating to liability of ISPs for information disseminated through
their networks is not completely settled. A number of lawsuits have sought to
impose such liability for defamatory speech, infringement of copyrighted
materials and other claims. A U.S. Circuit Court of Appeals case held that an
ISP was protected by a provision of the Communications Decency Act from
liability for material posted on its system but this case may not be applicable
in other factual circumstances. Other courts have held that online service
providers and ISPs may, under some circumstances, be subject to damages for
copying or distributing copyrighted materials.

                                       25
<PAGE>

However, in an effort to protect certain qualified ISPs, the Digital Millennium
Copyright Act provides qualified ISPs with a "safe harbor" from liability for
copyright infringement. PSINet has taken steps to qualify for the "safe harbor"
but there is no assurance that it will be found to have qualified, if
challenged in court. In 1998, the Child Online Protection Act was enacted
requiring limitations on access to pornography and other material deemed
"harmful to minors." This legislation has been attacked in court as a violation
of the First Amendment. PSINet is unable to predict the outcome of this case at
this time. The imposition upon ISPs or Web server hosts of potential liability
for materials carried on or disseminated through their systems could require it
to implement measures to reduce its exposure to such liability. Such measures
may require that PSINet spend substantial resources or discontinue some product
or service offerings. Any of these actions could have an adverse effect on
PSINet's business, operating results and financial condition.

   The regulation and liability of ISPs regarding information disseminated
through their networks is also undergoing a process of development in other
countries. For example, a recent court decision in England held an ISP liable
for certain allegedly indecent content carried through its network under
factual circumstances in which the ISP had failed to delete it when asked to do
so by the complainant. This case is reported to have settled at the end of
March 2000 with the ISP paying the claimant (Pounds)200,000. Legal developments
in other countries may impact PSINet due to its operations in those countries
as well as the ubiquity of the Internet. Decisions, laws, regulations and other
activities regarding regulation and content liability may significantly affect
the development and profitability of companies offering on-line and Internet
access services, including PSINet.

   One particular area of uncertainty in this regard results from the entry
into effect of European Union Directive 95/46/EC on the protection of
individuals with regard to the processing of personal data and on the free
movement of such data. The EU Directive imposes obligations in connection with
the protection of personal data collected or processed by third parties. Under
some circumstances, PSINet may be regarded as subject to the EU Directive's
requirements. The United States and the European Union currently are
negotiating the application of the EU Directive to U.S. companies.

Asserting and defending intellectual property rights may adversely impact
results of operations regardless of the outcome

   Competitors increasingly assert intellectual property infringement claims
against each other. The success of PSINet's business depends on its ability to
successfully defend its intellectual property. These types of claims may have a
material adverse impact on it regardless of whether or not PSINet is
successful. From time to time, PSINet has received claims that it has infringed
upon the rights of others. If a competitor were successful bringing a claim
against PSINet, PSINet's business might suffer. PSINet cannot assure you that
it will be successful defending or asserting its intellectual property rights.

PSINet is subject to foreign currency and exchange risks

   During the year ended December 31, 1999, 51% of PSINet's revenue was derived
from operations outside the United States and 21% of its assets were located
outside the United States. PSINet anticipates that a significant percentage of
its future revenue and operating expenses will continue to be generated from
operations outside the United States, including investment in foreign
companies. Accordingly, PSINet will be subject to significant foreign currency
and exchange risks. PSINet's obligations and those of its customers in foreign
currencies will be subject to unpredictable and indeterminate fluctuations in
the event that such currencies change in value relative to U.S. dollars.
Furthermore, PSINet and its customers may be subject to exchange control
regulations which might restrict or prohibit the conversion of such currencies
into U.S. dollars. Although PSINet has not entered into hedging transactions to
limit its foreign currency risks, as a result of the increase in its foreign
operations and its issuance of euro-denominated indebtedness, it may implement
such practices in the future. PSINet cannot assure you that it will be
successful in these activities or that they will not have an adverse effect on
its financial condition.

                                       26
<PAGE>

PSINet is subject to competitive pressures that may adversely impact it

   The market for Internet connectivity and related services is extremely
competitive. PSINet's current and prospective competitors include national,
regional and local ISPs, long distance and local exchange telecommunications
companies, cable television and direct broadcast satellite providers, wireless
communications providers and on-line service providers. While PSINet believes
that its network, products and customer service distinguish it from its
competitors, some of these competitors have greater market presence, brand
recognition, and financial, technical and personnel resources.

New regulations may adversely affect PSINet

   PSINet's activities subject it to varying degrees of federal, state and
local regulation. The Federal Communications Commission (FCC) exercises
jurisdiction over all facilities of, and services offered by,
telecommunications carriers to the extent that they involve the provision,
origination or termination of jurisdictionally interstate or international
communications. The state regulatory commissions retain jurisdiction over the
same facilities and services to the extent they involve origination or
termination of jurisdictionally intrastate communications.

   PSINet's Internet operations are not currently subject to direct regulation
by the FCC or any other governmental agency, other than regulations applicable
to businesses generally. However, the FCC has indicated that some services
offered over the Internet, such as phone-to-phone IP telephony, may be
functionally indistinguishable from traditional telecommunications service
offerings and their non-regulated status may have to be re-examined. PSINet is
unable to predict what regulations may be adopted in the future, or to what
extent existing laws and regulations may be found applicable, or the impact
that any new or existing laws may have on its business. PSINet cannot assure
you that new laws or regulations relating to Internet services will not have an
adverse effect on it. Although the FCC has decided not to allow local telephone
companies to impose per-minute access charges on Internet service providers,
and that decision has been upheld by the reviewing court, further regulatory
and legislative consideration of this issue is likely. In addition, some
telephone companies are seeking relief through state regulatory agencies. Such
rules, if adopted, would affect PSINet's costs of serving dial-up customers and
could have an adverse effect on it.

If PSINet becomes subject to provisions of the Investment Company Act of 1940,
its business operations may be restricted

   PSINet has significant amounts of cash and pending its utilization of all
the net proceeds from its debt and equity offerings will have an even greater
amount of cash invested in short-term investment grade and government
securities. The Investment Company Act of 1940 places restrictions on the
capital structure and business activities of companies registered thereunder.
PSINet has active business operations in the Internet industry and does not
propose to engage in investment activities in a manner or to an extent which
would require it to register as an investment company under the Investment
Company Act of 1940. The Investment Company Act of 1940 permits a company to
avoid becoming subject to it for a period of up to one year despite the holding
of investment securities in excess of the amount permitted if, among other
things, its board of directors has adopted a resolution which states that it is
not the company's intention to become an investment company. PSINet's board of
directors has adopted such a resolution that would become effective in the
event it is deemed to fall within the definition of an investment company. If
PSINet were to be determined to be an investment company, its business would be
adversely affected.

The market price and trading volume of PSINet's stock may be volatile

   The market price and trading volume of PSINet's common stock has been and
may continue to be highly volatile. Factors such as variations in PSINet's
revenue, earnings and cash flow and announcements of new service offerings,
technological innovations, strategic alliances or acquisitions involving
PSINet's competitors or price reductions by PSINet, PSINet's competitors or
providers of alternative services could cause the market

                                       27
<PAGE>


price of PSINet's common stock to fluctuate substantially. In addition, the
stock markets recently have experienced significant price and volume
fluctuations that particularly have affected technology-based companies and
resulted in changes in the market prices of the stocks of many companies that
have not been directly related to the operating performance of those companies.
The broad market fluctuations have adversely affected and may continue to
adversely affect the market price of PSINet's common stock and convertible
preferred stock. In addition, fluctuating markets could adversely affect
PSINet's ability to finance its requirements for acquisitions and working
capital.

PSINet does not anticipate paying cash dividends on its common stock

   PSINet has never declared or paid any cash dividends on its common stock and
does not anticipate paying cash dividends on its common stock in the
foreseeable future. In addition, PSINet's debt securities contain limitations
on its ability to declare and pay cash dividends.

Risk Factors Relating to Metamor

   Investors are urged to read the risk factors relating to Metamor's business
contained in Metamor's Annual Report on Form 10-K for the fiscal year ended
December 31, 1999 which is incorporated by reference in this document. After
the merger, these risk factors will apply to the combined entity. To the extent
that the businesses of PSINet and Metamor are subject to similar risks, the
combined entity may be more susceptible to such risks than either PSINet or
Metamor would be as an individual company.


                                       28
<PAGE>

                                 THE COMPANIES

PSINet Inc.

   PSINet is a leading global provider of Internet and eCommerce solutions to
businesses. As an Internet Super Carrier (ISC), it offers a robust suite of
products globally that enables its customers to utilize the Internet for
mission critical applications carried over a worldwide fiber optic network that
is capable of transmission speeds in excess of three terabits per second.
PSINet defines the elements of an ISC to include:

  .  Worldwide fiber network and related optronic equipment--PSINet operates
     one of the largest global data communications networks. It is Internet
     optimized and built with PSINet's fiber, satellite and wireless
     facilities which circumnavigate the globe, and is designed to enable
     PSINet's customers to connect to the Internet and access their corporate
     networks and systems resources from most of the world's major business
     and population centers.

  .  Multiple Internet and eCommerce hosting centers--PSINet currently has
     open eight global Internet and eCommerce hosting centers located in
     Amsterdam, Herndon (Virginia/DC), La Chaux-de-Fonds (Switzerland),
     London, Los Angeles, New York City, Toronto and Tokyo. These data
     centers contain a total of approximately 250,000 square feet. In
     addition, PSINet plans to open the following 16 global Internet and
     eCommerce hosting centers: eight in its U.S./Canada segment (Atlanta,
     Austin, Boston, Dallas, Loudoun (Virginia/DC), Miami, San Francisco and
     Toronto); three in its Europe segment (Berlin, Geneva and Paris); three
     in its Asia/Pacific segment (Hong Kong, Seoul and Sydney) and two in its
     Latin America segment (Buenos Aires and Mexico City). These data centers
     are expected to range from 60,000 to 360,000 square feet each. Once all
     of these hosting facilities are completed, PSINet will have more than 2
     million square feet of state-of-the-art infrastructure in key financial
     and business centers around the world.

  .  Full suite of products--PSINet offers a full suite of Internet access
     and eCommerce products for corporate customers in 28 countries that not
     only allow them to access the Internet but also to host their mission
     critical business applications. It has a private label business unit,
     serving leading Internet Service Providers (ISPs) and telephone
     companies with Internet services supporting nearly 1 million consumers.
     In addition, through its Virtual ISP (VISP) programs, PSINet provides a
     full private label solution to organizations who wish to offer Internet
     services to their customers, employees or members.

  .  Extensive global distribution--PSINet has over 1,000 sales personnel and
     2,500 Value Added Resellers (VAR), systems integrators and Web design
     professionals throughout the world.

  .  Global brand name recognition--PSINet's brand name is increasingly
     recognized throughout the world for Internet and eCommerce services and
     applications that meet the needs of business customers, supported by
     local language sales, provisioning and service.

   PSINet offers a suite of value-added products and services that allow its
customers, through their use of the Internet, to more efficiently transact and
conduct eCommerce with their customers, suppliers, business partners and remote
office locations. PSINet provides Internet connectivity and Web hosting
services to approximately 100,000 corporate accounts, which together with its
ISP, carrier, small office/home office (SOHO) and consumer businesses around
the world serve over 2.0 million end users. PSINet's services and products
include dedicated, dial-up and digital subscriber line (DSL) Internet access
services connections, Web hosting and collocation services, transaction network
services, virtual private networks (VPNs), eCommerce solutions, voice-over-
Internet protocol (IP), e-mail and managed security services. PSINet also
provides wholesale and private label network connectivity and related services
to other ISPs and telecommunications carriers to further utilize its network
capacity. It serves approximately 90 of the 100 largest metropolitan
statistical areas in the U.S., has a presence in the 20 largest
telecommunications markets globally and operates in 28 countries. PSINet
conducts its business through operations organized into five geographic
operating segments--U.S./Canada, Latin America, Europe, Asia/Pacific and
India/Middle East/Africa.


                                       29
<PAGE>


   PSINet operates one of the largest global commercial data communications
networks. Its Internet-optimized network extends around the globe and is
connected to more than 900 POPs that enable its customers to connect to the
Internet. Its network reach allows PSINet customers to access their corporate
network and systems resources through local calls in over 150 countries. It
expands the reach of its network by connecting with other large ISPs through
contractual arrangements, called peering agreements, that permit the exchange
of information between its network and the networks of its peering partners.
PSINet offers free peering to ISPs in more than 100 cities in the continental
U.S., which provides each party with the opportunity to bypass the often
congested and unreliable public exchange points, thereby improving overall
network performance and customer satisfaction. PSINet currently has eight
global Internet and eCommerce hosting centers operating and plans to open 16
more centers. It also has three network operating centers that monitor and
manage network traffic 24-hours per day, seven-days per week.

   PSINet's mission is to build the premier global IP-based communications
company. It has grown by using multiple sales channels, including direct sales
and resellers, and by acquiring other ISPs and related businesses in key
markets. It has increased revenues by providing services and products that
enhance its customers' business processes by helping them to effectively use
the Internet. It has embarked on an initiative to aggressively grow its hosting
center business through the construction of more than $1.0 billion of new
facilities.

   As a result of acquisitions in 1998 and 1999, PSINet has amassed a
significant number of consumer customers throughout its operating regions. Its
primary strategic focus is on providing services to business and wholesale
customers. Accordingly, in February and March 2000 PSINet announced that it has
begun consolidating its worldwide retail consumer operations into a new retail
business unit known as Inter.net. Inter.net will be run by an experienced
management team and will consist of nearly 500 staff specialists in consumer
sales, marketing and customer support, as well as the existing billing and
customer support systems. Inter.net will initially serve approximately 550,000
consumer accounts distributed throughout global markets (mostly outside of the
United States), with over 30 localized consumer portals in more than 20
countries. PSINet is currently assessing its options regarding Inter.net,
including a possible IPO or spin-off of the business, to best maximize PSINet
shareholder value. In the first quarter of 2000, PSINet incurred $1.1 million
of incremental costs related to the consolidation and planned distribution or
sale of its consumer business.

   In February 2000, PSINet announced the launch of PSINet Ventures, a new
corporate venture program. With a combination of cash investments and the
exchange of services for equity, PSINet Ventures will partner with innovative
Internet entrepreneurs through direct minority equity investments, typically
during early and mid-stage financing. PSINet Ventures will focus globally on
application service providers (ASPs), content service providers (CSPs),
eCommerce providers, Internet infrastructure providers, incubators, and other
emerging opportunities that enhance PSINet's financial and competitive
technology and service positions. The services for equity structure permits the
start-up company to purchase any PSINet service, including managed web hosting
and VISP services, in exchange for equity rather than cash.

   During the past two years PSINet has made significant acquisitions of fiber-
based bandwidth and related equipment to enhance its network infrastructure and
lower its per unit operating costs. In addition, it has acquired more than 65
companies throughout its five geographic operating regions, with many in the
same countries where the result is an overlapping network infrastructure.
During the first quarter of 2000, PSINet completed and approved a plan that
will be directed to eliminating redundancies, streamlining operations, and
taking advantage of synergies created by its mergers and acquisitions process.
As a result of these actions, during the quarter ended March 31, 2000 PSINet
recorded a restructuring charge of $16.9 million and $59.0 million of write-off
of assets and accelerated depreciation and amortization of certain tangible and
intangible assets.


                                       30
<PAGE>

Metamor Worldwide, Inc.

   Metamor is a leading provider of information technology (IT) solutions with
one of the broadest and most diverse service offerings available in the
industry. It was founded in 1993 as a traditional staffing services business
under the name COREStaff, Inc. In 1994, Metamor began offering information
technology services to its clients and in 1998 it divested itself of its
traditional staffing services business. In 1999, Metamor completed the initial
public offering of 20% of its eBusiness solutions subsidiary, Xpedior
Incorporated. On December 16, 1999, Xpedior began trading on The Nasdaq Stock
Market under the symbol "XPDR." Metamor still owns approximately 80% of the
outstanding stock of Xpedior. As a result of the proposed merger with PSINet,
Metamor has withdrawn its request for a private letter ruling from the IRS
related to the tax-free distribution of Xpedior common stock to Metamor
stockholders. Once the merger is completed, PSINet intends to explore its
available alternatives while maintaining a close operating relationship with
Xpedior.

   Information technology solutions consist of solutions relating to systems
that support the flow of information within and between companies and
institutions through electronic means, including computer systems, software and
peripheral systems. To meet the needs of its clients and implement solutions
with flexible project delivery capabilities, Metamor offers a broad array of
information technology solutions through its four business units: Metamor
Enterprise Solutions, a provider of comprehensive enterprise value chain
services, including supply chain management (SCM), enterprise resource planning
(ERP) and customer relationship management (CRM); Metamor Global Solutions, a
provider of global application development and outsourcing; Metamor Industry
Solutions, a provider of industry segment solutions; and Metamor European
Operations, a provider of IT consulting and ERP solutions in the European
markets.

   Many of Metamor's clients are Global 2000 corporations. Metamor also has a
significant presence in the middle market with client companies ranging in size
from $200 million to $2 billion in annual revenues. Metamor offers its clients
a broad range of IT solutions. With offices across the United States and
abroad, Metamor's flexible delivery of value-added services is provided through
a combination of geographic presence, industry focus and specialized technology
practices. These services include the following:

  .  Strategy and planning--Involves working with a client to determine how
     information flows can be leveraged to cut costs, increase productivity,
     and in many cases drive revenue. To evaluate systems, consultants study
     business processes, audiences, channels and users to determine what
     applications and level of IT infrastructure are necessary to meet
     clients' strategic goals.

  .  Process improvement--Leverages past IT investments by ensuring
     appropriate infrastructure, eliminating inefficiencies and migrating to
     newer technologies.

  .  Enterprise resource planning--Includes strategic planning, package
     evaluations, business system analysis, infrastructure analysis,
     customization, implementation, maintenance, help desk support, upgrade
     planning and deployment, training and education, web enablement and
     change management services. Experienced project teams, including project
     leaders, functional and technical leads, developers and application
     database administrators, leverage past experience while implementing
     these complex systems.

  .  Customer relationship management--Includes assessment, planning,
     implementation and on-going support services of CRM solutions that
     automate such functions as lead generation, opportunity management,
     workflow analysis, field service and client care.

  .  Supply chain management--Includes assessment, planning, implementation
     and on-going support of SCM solutions that optimize the way goods are
     produced, from long-term sourcing and capital plans to short-term
     scheduling on manufacturing floors. Benefits include more efficient
     production, more timely products and service delivery, and the
     information necessary to isolate and circumvent problems throughout the
     supply chain.

  .  eStrategy--Defines eEnabled business processes, system and application
     requirements and the operational roles associated with new eBusiness
     strategies. An initial assessment is followed by a

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<PAGE>

     formal plan to launch or improve the success of eBusiness objectives
     including technology recommendations, time frames and infrastructure
     needs.

  .  eDevelopment--Designing and delivering browser-enabled solutions for
     eCommerce, intranets, extranets, and web sites. Consultants determine
     the technology combination best suited for a client's unique needs,
     including database and integration, web site design and development,
     intranet systems and architecture.

  .  eMarketing--Includes defining sales channels, analyzing client bases to
     identify high-value clients, creating strategies to capture client needs
     and preferences and defining a process for mass customized messaging
     driven by client requirements.

  .  eEnablement--Integrating package, custom and legacy systems with
     Internet technologies to bridge the gap between operations, clients and
     suppliers.

  .  Custom application development--Involves leveraging expertise in
     industry dynamics, process management, and application and architecture
     design to construct scalable and flexible custom software applications.
     Solutions take into account the business processes surrounding the new
     system and the unique needs of the end user.

  .  System integration--Provide customized integration services, from
     implementing new third-party software, to preparing for the integration
     of systems from acquired companies.

  .  Enterprise application integration--Allows interoperability between two
     or more enterprise applications by implementing a set of technologies
     that allow the movement and exchange of information between different
     applications and business processes within and between organizations.

  .  Knowledge management--Implementing systems that can uncover important
     information about an organization's clients, suppliers and internal
     operations that is buried within multiple sources, inaccurate, or
     otherwise unusable. Components of a knowledge management system include
     data warehousing, data mining, business analysis and business
     intelligence solutions.

  .  Quality assurance and testing--Using a proven testing methodology,
     certified software test engineers provide user, unit and acceptance
     testing using automated testing tools.

  .  Training--Developing highly customized courseware focused on the end-
     user and offering prepackaged application software training for clients
     who choose to initiate, or continue, their training in-house.

  .  Application maintenance--Ensuring the ongoing accessibility,
     functionality and interoperability of customized applications, third
     party applications and applications developed by Metamor.

  .  Networking services--Supporting complex distributed network
     infrastructures through planning and modeling, design, implementation,
     technical support, desktop management, security, disaster avoidance and
     data/voice/video integration.

  .  Total IT management--Providing the complete IT department, from the
     chief information officer function (strategy and management) through the
     help desk.

   Metamor has developed a sales and marketing strategy that focuses on
national, regional and local accounts within specific industries. Regional and
local accounts are targeted by account managers at the regional offices,
enabling Metamor to capitalize on the local expertise and established
relationships of its regionally-dispersed employees. Where appropriate, the
sales efforts are supported with specific expertise from the functional Centers
of Excellence and Practice areas. Such accounts are solicited through personal
sales presentations, referrals from clients and advertising in a variety of
local and national media, including newspapers, trade and industry
publications, radio and outdoor advertising. Metamor also conducts public
relations activities designed to enhance public recognition of Metamor and its
services. Local employees are

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encouraged to be active in civic organizations and industry trade groups to
facilitate the development of new client relationships.

   Metamor's national sales and marketing efforts are coordinated by management
at the corporate level, which enables Metamor to develop a consistent, focused
strategy to pursue new business opportunities. Metamor employs the Solutions
Selling(R) methodology, and has trained all of its sales staff so that it can
more effectively sell its solutions based IT services. The Company continues to
penetrate existing customers, to expand existing business while offering
solutions based services to new customers in its strategic vertical industries.
This strategy allows Metamor to leverage the capabilities of each of its
business units and cross-sell its solutions using a single, standard sales and
marketing approach.

   In the IT services industry, the demand for project managers, system
architects, business analysts and other technology consultants significantly
exceeds supply. Metamor's success depends in large part on its ability to
attract, develop, motivate and retain highly-skilled IT consultants. Metamor
has strong recruiting channels in the United States, Europe and India to hire
experienced IT consultants. Metamor also has a program focused on hiring and
training recent college graduates. To ensure the high quality of its personnel,
Metamor follows a selection process that includes interviews, tests and
reference checks. At December 31, 1999, Metamor employed approximately 4,650
full-time employees and consultants, of whom approximately 1,500 are foreign
nationals working in the United States under H1-B permits. As of December 31,
1999, Xpedior had 1,317 full-time employees, comprised of 1,045 professionals
and 272 administrative and support employees.


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<PAGE>

                              THE SPECIAL MEETINGS

   We are furnishing this proxy statement/prospectus to shareholders of PSINet
and stockholders of Metamor as part of the solicitation of proxies by the
PSINet and Metamor boards of directors for use at the special meetings of
PSINet and Metamor.

The PSINet Special Meeting

   Date, Time and Place. PSINet's board of directors is soliciting proxies in
the form accompanying this document for use at the special meeting of PSINet
shareholders. The special meeting of PSINet shareholders will be held on
Thursday, June 15, 2000, at 10:00 a.m., local time, at PSINet's offices located
at 44983 Knoll Square, Ashburn, Virginia.

   Purpose of Special Meeting. At the special meeting, PSINet will ask holders
of PSINet common stock as of the record date to approve the issuance of PSINet
common stock in connection with the merger and to approve certain amendments to
PSINet's 1999 Employee Stock Purchase Plan and 1999 International Employee
Stock Purchase Plan (the Purchase Plans).

   Record Date; Stock Entitled to Vote; Quorum. PSINet's board of directors has
fixed the close of business (5:00 p.m. local time in Virginia) on April 25,
2000 as the record date. Only holders of record of PSINet common stock at the
close of business on the record date are entitled to notice of and to vote at
the PSINet special meeting. On the record date, 157,329,642 shares of PSINet
common stock were issued and outstanding and held by approximately 829 holders
of record.

   A quorum will be present at the PSINet special meeting if a majority of the
shares of PSINet common stock issued and outstanding and entitled to vote on
the record date are represented at the meeting in person or by proxy. In the
event that a quorum is not present at the PSINet special meeting, it is
expected that the meeting will be adjourned or postponed to solicit additional
proxies. Holders of record of PSINet common stock on the record date are
entitled to one vote per share at the PSINet special meeting.

   Voting by PSINet Directors and Executive Officers. Based on information
available to PSINet, it believes that as of the record date its directors and
executive officers and their affiliates owned and were entitled to vote
approximately 11,500,000 shares of PSINet common stock, or approximately 7.3%
of the shares of PSINet common stock outstanding on the record date.

   Proposal One--The Merger (pp. 38 through 95). The first proposal to be acted
upon at the PSINet special meeting is a proposal to approve the issuance of
PSINet common stock in connection with the merger. The shares of PSINet common
stock that will be issued in connection with the merger will include shares to
be issued as merger consideration to the Metamor stockholders, shares issuable
under Metamor options that are assumed by PSINet (including outstanding options
under Metamor's Employee Stock Purchase Plan) and shares issuable upon the
conversion of outstanding convertible notes of Metamor that are not converted
prior to the merger.

   The approval of the issuance of the PSINet common stock in connection with
the merger requires the affirmative vote of a majority of the total votes cast
with respect to such matter at the PSINet special meeting. William Schrader,
PSINet's Chairman and Chief Executive Officer, has agreed to vote 11,117,354
shares of PSINet common stock that he is entitled to vote at the PSINet special
meeting, representing 7.1% of the outstanding PSINet common stock entitled to
vote at the meeting, "for" the approval of the issuance of the PSINet common
stock in connection with the merger.

   PSINet's board of directors has determined that the merger is fair to, and
in the best interests of, PSINet shareholders. The board has unanimously
approved the merger and the issuance of the PSINet common stock in connection
with the merger and unanimously recommends that PSINet shareholders vote "for"
the issuance of the PSINet common stock.

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<PAGE>


   Proposal Two--Amendments to Employee Stock Purchase Plans (pp. 96 through
103). The second proposal to be acted upon at the PSINet special meeting is a
proposal to approve amendments to the Purchase Plans. The amendments would
increase the aggregate number of shares of PSINet common stock that may be
issued under the Purchase Plans by 2,000,000 shares from 2,115,000 shares to
4,115,000 shares and would permit PSINet to allow employees of acquired
companies to begin participating in the Purchase Plans at such times and on
such terms as the committee administering the Purchase Plans may determine. The
forms of the proposed amendments to the Purchase Plans are attached to this
document as Annex 4. See "PSINet's Employee Stock Purchase Plans" for a
description of the Purchase Plans.

   The increase in the number of shares that may be issued under the Purchase
Plans is necessary to accommodate the significant increase in the number of
PSINet's employees as a result of the merger. The amendment to provide
flexibility with respect to employees of acquired companies is necessary to
permit Metamor employees to begin participating in the Purchase Plans prior to
the commencement of a new offering period under the Purchase Plans, subject to
the discretion of the committee administering the Purchase Plans. PSINet wants
to ensure that its employees will be able to participate in the Purchase Plans
without interruption to assist it in attracting, retaining and motivating
employees. In addition, if PSINet is required to restrict participation in the
Purchase Plans because of an inadequate number of shares, under applicable
accounting principles, it may be required to recognize expenses in connection
with the Purchase Plans that it would not otherwise be required to treat as
expenses.

   The approval of the amendments to the Purchase Plans requires the
affirmative vote of a majority of the total votes cast with respect to such
matter at the PSINet special meeting.

   PSINet's board of directors has determined that the proposed amendments to
the Purchase Plans are in the best interests of PSINet shareholders. The board
has unanimously approved the amendments and unanimously recommends that PSINet
shareholders vote "for" the amendments to the Purchase Plans.

   The approval of the amendments to the Purchase Plans is not a condition to
the completion of the merger, and the approval of the issuance of the PSINet
common stock in connection with the merger is not a condition to the amendment
of the Purchase Plans.

The Metamor Special Meeting

   Date, Time and Place. Metamor's board of directors is soliciting proxies in
the form accompanying this document for use at the special meeting of Metamor
stockholders. The special meeting of Metamor stockholders will be held on
Thursday, June 15, 2000, at 9:00 a.m., local time, at The St. Regis Hotel, 1919
Briar Oaks Lane, Houston, Texas.

   Purpose of Special Meeting. At the special meeting, we are asking holders of
Metamor common stock to adopt the merger agreement. Metamor's board of
directors has determined that the merger is fair to, and in the best interests
of, Metamor stockholders. By the unanimous vote of those voting, the Metamor
board has approved the merger agreement and the merger and recommends that
Metamor stockholders vote "for" adoption of the merger agreement.

   Record Date; Stock Entitled to Vote; Quorum. Metamor's board of directors
has fixed the close of business (5:00 p.m. local time in Texas) on April 25,
2000 as the record date. Only holders of record of Metamor common stock at the
close of business on the record date, are entitled to notice of and to vote at
the Metamor special meeting. On the record date, 34,700,992 shares of Metamor
common stock were issued and outstanding and held by 221 holders of record.

   A quorum is present at the Metamor special meeting if one-third of the
shares of Metamor common stock issued and outstanding and entitled to vote on
the record date are represented at the meeting in person or by proxy; however,
the adoption of the merger agreement will require approval of the holders of a
majority of the

                                       35
<PAGE>

outstanding shares of Metamor common stock. In the event that a quorum is not
present at the Metamor special meeting, it is expected that the meeting will be
adjourned or postponed to solicit additional proxies. Holders of record of
Metamor common stock on the record date are entitled to one vote per share at
the Metamor special meeting on the proposal to adopt the merger agreement.

   Votes Required. The adoption of the merger agreement requires the
affirmative vote of a majority of the shares of Metamor common stock
outstanding on the record date.

   Voting by Metamor Directors and Executive Officers. Based on information
available to Metamor, it believes that as of the record date, Metamor directors
and executive officers and their affiliates owned and were entitled to vote
2,652,895 shares of Metamor common stock, or approximately 7.6% of the shares
of Metamor common stock outstanding on the record date. Peter Dameris,
Metamor's Chief Executive Officer and President, has agreed to vote 48,650
shares of Metamor common stock that he is entitled to vote at the Metamor
special meeting, representing less than one percent of the outstanding Metamor
common stock entitled to vote at the meeting, "for" the adoption of the merger
agreement.

Voting of Proxies

   All PSINet and Metamor shares represented by properly executed proxies
received in time for the applicable special meeting will be voted at the
applicable special meeting in the manner specified by the proxies. Properly
executed proxies that do not contain voting instructions will be voted "for"
the approval of the issuance of the PSINet common stock or the adoption of the
merger agreement, as the case may be. Shares of PSINet and Metamor common stock
represented at the applicable special meeting but not voting, including shares
of PSINet common stock for which proxies have been received but for which
holders of shares have abstained, will be treated as present at the special
meeting for purposes of determining the presence or absence of a quorum for the
transaction of all business.

   Only shares affirmatively voted for a proposal, including properly executed
proxies that do not contain voting instructions, will be counted as favorable
votes for that proposal. Brokers who hold shares of PSINet or Metamor common
stock in street name for customers who are the beneficial owners of such shares
may not give a proxy to vote those customers' shares in the absence of specific
instructions from those customers. These unvoted shares are referred to as
broker non-votes. Shares represented by broker non-votes will be counted as
present for determining the existence of a quorum and, in the case of the
Metamor special meeting, have the effect of votes against adoption of the
merger agreement. The persons named as proxies by a stockholder may propose and
vote for one or more adjournments of the special meetings, including
adjournments to permit further solicitations of proxies. No proxy voted against
a proposal will be voted in favor of any adjournment or postponement.

   PSINet and Metamor do not expect any matter other than the proposals
described in this document to be brought before either special meeting. If,
however, either the PSINet or Metamor board of directors properly presents
other matters at the applicable special meeting, the persons named as proxies
will vote in accordance with their judgment.

Revocability of Proxies

   The grant of a proxy by telephone, over the Internet or on the enclosed form
of proxy does not preclude a stockholder from voting in person at the special
meeting. A stockholder may revoke a proxy at any time prior to its exercise by
filing with the Secretary of PSINet or Metamor, as applicable, a duly executed
revocation of proxy, by submitting in the same manner as the prior proxy a duly
executed proxy bearing a later date or by appearing at the special meeting and
voting in person. Attendance at the special meeting will not itself constitute
revocation of a proxy.


                                       36
<PAGE>

Solicitation of Proxies

   PSINet will bear the cost of the solicitation of proxies from its
shareholders, and Metamor will bear the cost of the solicitation of proxies
from its stockholders. In addition to solicitation by mail, the directors,
officers and employees of PSINet and Metamor and their respective subsidiaries
may solicit proxies from stockholders by telephone or other electronic means or
in person. PSINet and Metamor will cause brokerage houses and other custodians,
nominees and fiduciaries to forward solicitation materials to the beneficial
owners of stock held of record by such persons. PSINet or Metamor, as
applicable, will reimburse such custodians, nominees and fiduciaries for their
reasonable out-of-pocket expenses in doing so.

   MacKenzie Partners, Inc. will assist in the solicitation of proxies by
PSINet. PSINet will pay MacKenzie Partners, Inc. a fee, not to exceed $5,000
plus reimbursement of certain out-of-pocket expenses, and will indemnify them
against any losses arising out of their proxy solicitation services on behalf
of PSINet. Georgeson Shareholder Communications Inc. will assist in the
solicitation of proxies by Metamor. Metamor will pay Georgeson Shareholder
Communications Inc. a fee, not to exceed $10,000 plus reimbursement of certain
out-of-pocket expenses, and will indemnify them against any losses arising out
of their proxy solicitation services on behalf of Metamor.

   Metamor stockholders should NOT send stock certificates with your proxy
cards. You will receive instructions on when and where to surrender your stock
certificates after the merger.


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<PAGE>

                                   THE MERGER

   The following discussion summarizes the material terms of the merger and the
merger agreement. Stockholders should read carefully the merger agreement,
which is attached as Annex 1 to this document.

Background to the Merger

   Within the last year, PSINet began to receive feedback from its sales force
that it would be advantageous to add certain eCommerce and information
technology, or IT, services to its portfolio of customer offerings. As a
result, one goal of PSINet's Internet Super Carrier strategy became attaining
the ability to offer a complete portfolio of IT communications, hosting, out-
sourced applications and system integration services. PSINet, after
consultation with its financial advisor Donaldson, Lufkin & Jenrette Securities
Corporation (DLJ), identified the acquisition of a large IT service provider as
the best way to obtain such capabilities on an expedited basis.

   On Tuesday, March 7, 2000, at the request of PSINet's senior management, DLJ
identified to and discussed with PSINet one privately held entity and four
publicly traded corporations, including Metamor and Xpedior, that offered the
type of IT services that appeared to match PSINet's previously identified
needs. PSINet asked DLJ to investigate the possibility of a transaction with
Metamor and Xpedior.

   On Wednesday, March 8, at the request of PSINet's senior management,
representatives of PSINet's financial advisor contacted representatives of a
separate team at DLJ who were acting as financial advisors to Metamor to
express PSINet's interest in exploring the possibility of a strategic business
combination with Metamor. Metamor responded that it would entertain a dialog
with PSINet and that its management team was considering strategic
relationships that would expand its application service provider and
application outsourcing offerings to middle market business customers.

   On Thursday, March 9, PSINet's legal and financial advisors commenced an
intensive due diligence review of the publicly available information regarding
Metamor and Xpedior that continued through the weekend. Representatives of
PSINet's financial advisor and finance department also conducted financial
analyses intended to demonstrate the effects of an acquisition by PSINet of
Metamor and/or Xpedior by one or more mergers. In anticipation of exchanging
information, the parties entered into a confidentiality agreement on March 10,
2000.

   On Friday, March 10, Harold Wills, PSINet's President and Chief Operating
Officer, and William Schrader, PSINet's Chairman and Chief Executive Officer
met in Houston with Peter Dameris, Metamor's Chairman, Chief Executive Officer
and President, and David Campbell, Xpedior's President and Chief Executive
Officer. During this initial meeting, the parties explored potential business
relationships among PSINet, Metamor and Xpedior, including a possible business
combination. They also discussed valuation issues relating to Metamor and
Xpedior. At the conclusion of the meeting, it was decided that it would be
advantageous to all of the parties to continue discussions and due diligence
relating to a potential business combination.

   On Saturday, March 11, Harold Wills and other members of PSINet's senior
management team, accompanied by representatives of its financial advisor, met
with members of Metamor's and Xpedior's senior management and representatives
of Metamor's financial advisor to commence high level financial due diligence
and to present detailed information on each company's capabilities and discuss
the complementary service offerings that the combined company could bring to
the market. This due diligence continued over the weekend and involved several
conference calls between PSINet's finance department and representatives of its
financial advisor, on the one hand, and Metamor's finance department and
representatives of its financial advisor on the other hand.

   The senior management of the companies continued to discuss the strategic
fit between Metamor, Xpedior and PSINet between March 12 and March 21, with
senior management and their advisors meeting in Virginia

                                       38
<PAGE>

several times beginning March 17. During that period, the parties had
discussions regarding the relative valuation of the companies and the general
terms and conditions of the proposed transaction. Also during this period,
Metamor and PSINet retained separate independent financial advisors, in
addition to their separate financial advisor teams at DLJ, to advise their
boards of directors as to the fairness of a transaction to Metamor's
stockholders and PSINet. Metamor engaged Lazard and PSINet engaged Robertson
Stephens as their independent financial advisors.

   On Monday, March 13, senior management from PSINet and Metamor continued
their discussions regarding a potential business combination by telephone. The
two companies also reviewed and discussed with representatives of their
financial advisors a proposed fixed exchange ratio based on an implied price of
approximately $45 per share of Metamor common stock. The parties agreed to
continue discussions on the basis of this valuation.

   On the evening of Wednesday, March 15, a special board meeting of PSINet was
held by telephone to discuss a possible transaction with Metamor and Xpedior.
At the meeting, Mr. Wills provided information concerning Metamor and Xpedior
to the board and discussed strategic alternatives available to PSINet. The
board then discussed the possible relative valuation of the companies as well
as a possible business combination and presented questions to PSINet's senior
management and counsel attending the meeting. At the conclusion of the meeting,
the board indicated its support for PSINet's management continuing to pursue a
transaction with Metamor and Xpedior.

   On Thursday, March 16, members of PSINet's senior management gave an
overview presentation about PSINet to members of Metamor's senior management at
meetings in Houston. At these meetings members of Metamor's senior management
gave business, financial and operational presentations to members of PSINet's
senior management and PSINet's representatives of PSINet's financial advisor
regarding Metamor's European Operations and Global and Industry Solutions
business units. Simultaneously, PSINet's counsel and its independent
accountants visited Metamor's offices to conduct legal and accounting due
diligence reviews of Metamor. That night, PSINet's counsel first transmitted a
draft merger agreement to Metamor and its legal and financial advisors that
contemplated a stock for stock exchange with a fixed exchange ratio.

   On Friday, March 17, Metamor's and Xpedior's senior management continued
presentations in Northern Virginia to PSINet's senior management and
representatives of PSINet's financial advisors. These presentations focused on
Xpedior and Metamor's Enterprise Solutions business unit. Members of PSINet's
senior management also made an overview presentation about PSINet to Xpedior's
senior management. On March 17, representatives of Metamor visited PSINet's
offices to conduct further legal, operational and financial due diligence
reviews of PSINet. On March 17, PSINet's representatives at DLJ discussed with
Metamor's representatives at DLJ a proposed fixed exchange ratio of 0.9:1.0
based on a value of $45 per share for Metamor common stock and a value of $50
per share for PSINet common stock. Commencing late on March 17, 2000 and
continuing over the weekend, the parties and their counsel engaged in
negotiations regarding the terms and structure of the proposed transactions.

   On Saturday, March 18, PSINet informed Metamor that, after discussions with
Xpedior, PSINet and Xpedior had agreed that PSINet would not include as part of
the proposed transaction an acquisition of the approximately 20% of Xpedior
that Metamor did not own for many of the same reasons that Xpedior's business
was segregated from Metamor, including employee retention and compensation
issues. It would instead consider making a direct investment in Xpedior
convertible preferred stock. Metamor's management, together with Metamor's in-
house legal counsel and outside legal and financial advisors reviewed and
discussed the draft of the merger agreement distributed by PSINet, including
the price and other terms of the proposed merger.

   On Sunday, March 19, members of PSINet management and its advisors at DLJ
participated in a conference call with members of Metamor's and Xpedior's
management in which they discussed potential operational and business synergies
between PSINet and Metamor and Xpedior.

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<PAGE>

   On the evening of March 19, Metamor's board of directors held a telephonic
meeting to discuss the proposed transaction including a review of the
discussions to date, the proposed exchange ratio, and to better understand the
results of Metamor's ongoing due diligence review and the merits of the
proposed merger. At the meeting, which was also attended by Metamor's outside
legal and financial advisors, the Metamor board was informed of and discussed
the proposed terms of the merger and reminded of its fiduciary duties in
considering the merger under applicable law. At the conclusion of the meeting,
the board authorized management to continue negotiations with PSINet.

   From March 19 through the execution of the merger agreement, PSINet, Metamor
and their legal and financial advisors continued to negotiate the terms of the
merger and legal, operational, financial and technological due diligence
reviews continued for both companies. During this same period, PSINet, Xpedior
and their financial advisors and counsel negotiated the terms of and drafted a
letter of intent outlining the proposed investment by PSINet in convertible
preferred stock of Xpedior.

   On Monday, March 20, Robertson Stephens provided PSINet with a summary of
certain financial analyses performed by Robertson Stephens and PSINet's
management circulated this analysis to PSINet's board of directors with the
current draft of the merger agreement, due diligence summaries and ancillary
materials relating to the merger. That evening, PSINet held a telephonic
special meeting of its board of directors at which PSINet's management outlined
for the board its objectives for the merger. PSINet's management provided an
overview of Metamor's business and an analysis of PSINet's position in the
Internet, eCommerce and IT markets, focusing on the strategic fit between
PSINet and Metamor and the anticipated synergies from the merger. PSINet's
outside counsel summarized the terms of the merger agreement and discussed the
fiduciary duties of the board of directors in considering the merger under
applicable law. PSINet's representatives at DLJ discussed the synergies of the
proposed merger and the proposed terms of the merger. The board heard
presentations from, and asked questions of, PSINet's management and PSINet's
accountants and in-house and outside counsel regarding the financial,
operational, legal, tax and accounting due diligence process and results. At
the meeting, Robertson Stephens made a presentation summarizing certain
financial analyses performed by Robertson Stephens. The PSINet board consulted
with DLJ regarding Robertson Stephens' presentation and its assessment of the
merger. The board discussed the input received from PSINet's management and
advisors and the benefits and risks of the proposed merger.

   On Monday, March 20, Metamor's management circulated to Metamor's board a
draft of the merger agreement and a summary of the financial presentation
prepared by Lazard. Beginning in the evening of March 20 and continuing into
the morning of Tuesday, March 21, Metamor's board of directors held a
telephonic meeting to review the merger agreement and to consider the merits of
a possible business transaction with PSINet. Members of Metamor's senior
management reviewed for the board of directors the operational synergies
between the two companies and the results of their due diligence investigation.
Representatives of Lazard made a detailed financial presentation to Metamor's
board and orally advised the board that, in its opinion, as of that date and
based upon and subject to the factors and assumptions it described, the
exchange ratio in connection with the merger is fair to Metamor's stockholders
from a financial point of view. DLJ was not requested to, and did not, render
any opinion to Metamor's board of directors in connection with the merger.
Representatives of Metamor's outside legal counsel reviewed with Metamor's
board of directors the specific terms of the transaction, as embodied in the
merger agreement. After a significant period of discussion and questions,
Metamor's directors in attendance then unanimously voted to approve the merger
and the merger agreement and directed its management to complete negotiation of
the merger agreement on the terms discussed. One director was not present for
the vote.

   Beginning in the afternoon and continuing into the evening of Tuesday, March
21, PSINet held a second telephonic special meeting of its board of directors
to consider the merger agreement. PSINet management and its representatives
provided the board with an update as to the status of the negotiations with
Metamor and Xpedior and the board discussed with management how outstanding
issues had been resolved. Although DLJ was not requested to, and did not,
render any opinion to PSINet's board of directors in connection with the
merger, representatives of DLJ reviewed with the PSINet board other
transactions with which they were

                                       40
<PAGE>

familiar where the exchange ratio implied large premiums to the pre-
announcement stock price of the target. Robertson Stephens updated its
financial analyses of the financial terms of the proposed transaction and
orally advised PSINet's board of directors that, in its opinion, as of that
date and based upon and subject to the factors and assumptions it described,
the exchange ratio in connection with the merger is fair to PSINet from a
financial point of view. The board then deliberated on the proposed merger and
engaged in a discussion and asked questions concerning the proposed
transactions. Following this discussion, the board unanimously approved the
merger agreement, the letter of intent regarding the investment in Xpedior and
the transactions contemplated by the merger agreement and letter of intent and
authorized the execution, delivery and performance of the merger agreement, the
letter of intent and any related documents on behalf of PSINet.

   Messrs. Wills and Dameris executed and delivered the merger agreement on
behalf of PSINet and Metamor on the evening of Tuesday, March 21, 2000. At the
same time, representatives of PSINet and Xpedior executed and delivered a
letter of intent regarding the acquisition by PSINet of convertible preferred
stock of Xpedior and Messrs. Dameris and Schrader executed their respective
voting agreements. Before the market opened on Wednesday, March 22, PSINet,
Metamor and Xpedior issued a joint press release announcing the transactions.

   The registration statement of which this document is a part was originally
filed with the SEC on April 14. During the following weeks, PSINet, Metamor and
their advisors continued the preparation of this document and finalized their
plans for the special meetings.

   On April 24, the Metamor board executed a written consent setting the record
date for the Metamor special meeting. On April 28, the Metamor board met to
receive an update on the status of the transaction and operations of each of
Metamor and PSINet. At that meeting, management of Metamor also advised the
board that based on the additional information it had obtained since the
execution of the merger agreement, including favorable reactions from customers
and employees, it remained committed to the strategic benefits that the merger
could bring to Metamor. On May 11, the Metamor board met to approve the mailing
of this document and to set the date for the special meeting. At this meeting,
the Metamor board was again updated by management concerning the status of the
transaction and the operations of PSINet and Metamor, approved changes to
compensation arrangements for certain officers (as described under "The
Merger--Interests of Metamor's Directors and Management in the Merger") and
approved and authorized the mailing of this document.

   On April 16, the PSINet board conducted a telephonic meeting and received an
update on the status of the transaction and reviewed the operations of each of
PSINet and Metamor. On April 25, the PSINet board conducted a telephonic
meeting at which it fixed the record date for the PSINet special meeting, set a
date for the special meeting, approved the amendments to the Purchase Plans and
discussed the status of the transaction and the preparation of the registration
statement of which this document is a part.

PSINet's Reasons for the Merger and Board of Directors' Recommendation

   Reasons for the Merger. In reaching its decision to approve the merger
agreement and the merger, PSINet's board of directors consulted with its
management and advisors and independently considered the proposed merger
agreement and the transactions contemplated thereby. Based upon, among other
things, this review, PSINet's board of directors approved the merger agreement
and the transactions contemplated by the agreement.

   The strategic basis for the merger is PSINet's belief that the integration
of Metamor's IT business and experienced consulting staff with PSINet's
Internet connectivity, eCommerce, Web hosting and suite of value-added products
and services will present a significant opportunity to create a combined
organization that will be a leader in providing global eCommerce and Internet
solutions to businesses. PSINet believes that Metamor's eBusiness, application
development and software package service offerings will enable PSINet to
leverage its telecommunications network assets and hosting centers to allow the
combined company to provide its

                                       41
<PAGE>

customers with end-to-end solutions. When the eCommerce business of Transaction
Network Systems, Inc., which PSINet acquired in November 1999, is added to the
mix, the combined company appears to be in a position to accomplish PSINet's
goal of providing its customers with a complete portfolio of bundled services,
including access, business-to-business eCommerce, ASP, communications, hosting,
out-sourced applications and system integration services. Metamor's global
presence and 90,000 enterprise customers will also create significant worldwide
cross-selling opportunities and will set the stage for potentially rapid global
expansion. Finally, Metamor's cash flows may reduce the variability of PSINet's
cash flow by supplementing PSINet's revenues with sales of products and
services that produce recurring revenue on a per project basis.

   The foregoing assessment of the merger is based on PSINet's expectations
about future performance. Neither PSINet nor Metamor can assure you that after
the merger any of the results, efficiencies or opportunities described in this
document will be achieved. See "Risk Factors--Risks Relating to the Merger."

   In reaching its decision to approve the merger agreement and the
transactions contemplated thereby, the PSINet board also considered, among
other things, the following factors:

  .  the potential effect on shareholder value of a combination with Metamor
     in light of the financial condition and prospects of PSINet and Metamor
     and the current economic and industry environment, including, but not
     limited to the complementary service offerings of PSINet, Metamor and
     Xpedior and the possibility of synergies from combining PSINet's and
     Metamor's product and service offerings and sales and marketing
     organizations;

  .  its knowledge of the business operations, properties, assets, financial
     condition and operating results of Metamor;

  .  PSINet's future prospects and whether such prospects could be
     significantly enhanced by the merger and the anticipated operating
     results of Metamor;

  .  the exchange ratio in light of Metamor's and PSINet's current and
     historical stock market value and current financial market conditions;

  .  the results of due diligence investigations by PSINet's management and
     legal, financial and accounting advisors concerning the business,
     products and services, technology, operations, financial condition and
     prospects of Metamor;

  .  the terms and conditions of the merger agreement, which were the product
     of extensive arms' length negotiations;

  .  the compatibility of the respective business philosophies and corporate
     cultures of PSINet and Metamor;

  .  the availability of other strategic alternatives and the attractiveness
     of such alternatives;

  .  the management resources available to address the management needs of
     PSINet and management's experience in managing operations at different
     locations in integrating acquisitions;

  .  the anticipated impact of the merger on PSINet's and Metamor's
     customers, suppliers and employees; and

  .  the opinion of PSINet's financial advisor, Robertson Stephens, that, as
     of the date of the merger agreement and subject to the conditions set
     forth in Robertson Stephens' opinion, dated as of such date and
     addressed to PSINet's board of directors, the exchange ratio in
     connection with the merger is fair to PSINet from a financial point of
     view.

   PSINet's board of directors also identified and considered a number of
potentially negative factors in its deliberations concerning the merger,
including, but not limited to:

  .  the risk that despite the efforts of PSINet, management, marketing,
     consulting and technical personnel of Metamor might not choose to remain
     employed by the combined company;

                                       42
<PAGE>

  .  the risk that the combined company's ability to achieve synergies would
     be dependent upon customer acceptance of bundled service offerings and
     the pricing of bundled services, including the maintenance of current
     pricing levels and retention of key customers;

  .  the risk that the operations of the two companies would not be
     successfully integrated;

  .  the amount of the premium being paid in the merger compared to Metamor's
     current stock price and the potential impact on PSINet and its stock
     price;

  .  the other risks associated with PSINet's and Metamor's businesses and
     with the merger described under "Risk Factors;"

  .  the impact of the issuance of a large number of shares of PSINet common
     stock in connection with the merger; and

  .  the risk that the merger would not be completed, including a failure
     resulting from the shareholders of PSINet not approving the issuance of
     the PSINet common stock.

   PSINet's board of directors believed that, overall, these risks were
outweighed by the potential benefits of the merger.

   The foregoing discussion is not exhaustive of all factors considered by
PSINet's board of directors. Moreover, in view of the variety of factors
considered in connection with its evaluation of the merger and the merger
agreement, PSINet's board of directors considered the factors as a whole and
did not find it practicable to, and did not, quantify or otherwise assign
relative weight to the specific factors considered in reaching its
determination to approve the merger and the merger agreement. In addition, each
member of PSINet's board of directors may have considered other factors on an
individual basis, including factors unknown to PSINet, or given different
weight to different factors considered.

   Recommendation of PSINet's board of directors. After careful consideration,
PSINet's board of directors has unanimously determined that the terms of the
merger agreement and the merger are fair to, and in the best interests of,
PSINet and its shareholders and has approved the merger agreement and the
merger. PSINet's board of directors unanimously recommends that the
shareholders of PSINet vote "for" the issuance of PSINet's common stock in
connection with the merger.

Metamor's Reasons for the Merger and Board of Directors' Recommendation

   Reasons for the Merger. In reaching its decision to approve the merger
agreement and the merger, Metamor's board of directors consulted with its
management and advisors and independently considered the proposed merger
agreement and the transactions contemplated thereby. Based upon, among other
things, this review, Metamor's board of directors approved the merger agreement
and the transactions contemplated by the agreement. Metamor's board of
directors determined that the merger would be beneficial to Metamor and its
stockholders and that stockholders of Metamor should vote FOR the adoption of
the merger agreement. In approving the merger, Metamor's board of directors
considered the following matters:

  .  Metamor's stockholders will have the opportunity to participate in the
     growth potential of the combined company after the merger, which may
     create more long-term value for its stockholders;

  .  the combined company should have the ability to commit greater resources
     to both current and emerging IT and IP solution development efforts and
     to fund the future growth of its businesses;

  .  the premium that the exchange ratio represented at the time of the
     signing of the merger agreement;

  .  the integration of Metamor's enterprise value chain solutions, including
     packaged software solutions in supply chain management, enterprise
     resource planning and customer relationship management, with PSINet's
     application hosting and data centers around the world will enable the
     combined

                                       43
<PAGE>

     company to offer a stronger end-to-end application service provider and
     eCommerce solution to its customers and potentially significantly
     shorten the time to market for these global service offerings;

  .  the merger will provide access to PSINet's capital and technical
     resources which should accelerate Metamor's and Xpedior's product
     development and sales and marketing efforts;

  .  the global geographic coverage of PSINet's operations will allow the
     combined company to expand its service offerings in Europe, the United
     Kingdom, Asia and Latin America;

  .  Metamor's established relationships with large, strategic customers,
     partners and other third parties, larger solutions sales force and well
     established distribution channels will increase the number of
     prospective customers for PSINet's service offerings and products;

  .  Metamor will gain access to PSINet's customer bases; and

  .  the opinion of Metamor's financial advisor, Lazard, that, as of the date
     of the merger agreement and subject to the conditions set forth in
     Lazard's opinion, dated as of such date and addressed to Metamor's board
     of directors, the exchange ratio in connection with the merger is fair
     to Metamor's stockholders from a financial point of view.

   In the course of its deliberations, Metamor's board of directors reviewed
with Metamor's management and outside advisors a number of additional factors
relevant to the merger, including:

  .  historical information concerning PSINet's and Metamor's respective
     businesses, financial performance and condition, operations, technology,
     management and competitive position;

  .  Metamor management's view as to the financial condition, results of
     operations and businesses of PSINet and Metamor before and after giving
     effect to the merger based on earnings estimates and business, financial
     and legal due diligence investigations conducted by Metamor's
     management, financial advisors and legal advisors;

  .  current industry and financial market conditions and historical market
     prices, volatility and trading information with respect to PSINet common
     stock and Metamor common stock;

  .  an analysis of the market value of PSINet common stock to be issued in
     exchange for each share of Metamor common stock in light of comparable
     merger transactions;

  .  Metamor management's view as to the prospects of Metamor if Metamor was
     to remain an independent company;

  .  Metamor management's view as to the potential for other third parties to
     enter into strategic relationships with or to acquire Metamor;

  .  the potential impact of the merger on Metamor's customer and employee
     relationships;

  .  potential conflicts of interest of Metamor's management resulting from
     their interests in the merger;

  .  the terms of the merger agreement regarding Metamor's right to consider
     and negotiate other strategic transaction proposals, as well as the
     termination fee provisions; and

  .  that the merger is expected to be a tax-free reorganization.

   Metamor's board of directors also identified and considered a variety of
potentially negative factors in its deliberations concerning the merger,
including;

  .  the risk that the operations of Metamor and PSINet might not be
     successfully integrated or that the potential benefits sought in the
     merger might not be fully realized;

  .  the history of PSINet's operating losses and negative operating cash
     flows;

  .  the risk that the high valuation multiples at which PSINet's common
     stock had traded might not be sustained in the future;

                                      44
<PAGE>

  .  the fact that the exchange ratio is fixed at 0.9, with no adjustment if
     the value of PSINet common stock decreased;

  .  the possibility that the merger might not be completed, and the effect
     of the public announcement of the merger on:

    .  Metamor's sales and operating results,

    .  Metamor's ability to attract and retain key management, marketing
       and technical personnel; and

    .  Metamor's ongoing development projects;

  .  the possibility of customer or supplier confusion after the announcement
     of the proposed merger;

  .  the fact that the transaction requires approval of PSINet shareholders,
     in addition to Metamor stockholders;

  .  the difficulty that will be encountered in managing separate operations
     at different geographic locations; and

  .  the potential loss of key employees as a result of the merger.

   Metamor's board of directors believed that, overall, these risks were
outweighed by the potential benefits of the merger.

   The foregoing discussion is not exhaustive of all factors considered by
Metamor's board of directors. Moreover, in view of the variety of factors
considered in connection with its evaluation of the merger and the merger
agreement, Metamor's board of directors considered the factors as a whole and
did not find it practicable to, and did not, quantify or otherwise assign
relative weight to the specific factors considered in reaching its
determination to approve the merger and the merger agreement. In addition, each
member of Metamor's board of directors may have considered other factors on an
individual basis, including factors unknown to Metamor, or given different
weight to different factors considered.

   Recommendation of Metamor's Board of Directors. After careful consideration,
Metamor's board of directors believes that the merger and the merger agreement
are fair to Metamor's stockholders and in their best interests. Metamor's board
of directors has approved the merger and the merger agreement and recommends
that the stockholders of Metamor vote "for" the adoption of the merger
agreement.

Opinion of PSINet's Financial Advisor

   Pursuant to an engagement letter dated March 17, 2000, PSINet engaged
Robertson Stephens to render an opinion as to the fairness of the exchange
ratio, from a financial point of view, to PSINet.

   On March 21, 2000 at a meeting of the PSINet board held to evaluate the
proposed merger, Robertson Stephens delivered to the PSINet board its oral
opinion, which was subsequently confirmed in writing as of March 21, 2000,
that, as of such date and based on the assumptions made, the matters considered
and the limitations on the review undertaken described in the opinion, the
exchange ratio is fair from a financial point of view to PSINet. No limitations
were imposed by the PSINet board on Robertson Stephens with respect to the
investigations made or procedures followed by it in furnishing its opinion. The
exchange ratio was determined through negotiations between the respective
managements of PSINet and Metamor. Robertson Stephens was not asked by PSINet
to, and did not, recommend that any specific exchange ratio constituted the
appropriate exchange ratio for the merger.

   The full text of the Robertson Stephens opinion, which sets forth, among
other things, assumptions made, matters considered and limitations on the
review undertaken, is attached as Annex 2 to this document. PSINet shareholders
are urged to read the Robertson Stephens opinion in its entirety. The Robertson
Stephens opinion was prepared for the benefit and use of the PSINet board in
its consideration of the merger and does not

                                       45
<PAGE>

constitute a recommendation to shareholders of PSINet as to how they should
vote upon, or take any other action with respect to, the issuance of PSINet's
common stock.

   The Robertson Stephens opinion does not address:

  .  the relative merits of the merger and the other business strategies that
     the PSINet board has considered or may be considering; or

  .  the underlying business decision of the PSINet board to proceed with the
     merger.

   The summary of the Robertson Stephens opinion set forth in this document is
qualified in its entirety by reference to the full text of the Robertson
Stephens opinion.

   In connection with the preparation of the Robertson Stephens opinion,
Robertson Stephens, among other things:

  .  reviewed certain publicly available financial statements and other
     business and financial information of Metamor, Xpedior and PSINet,
     respectively;

  .  reviewed certain internal financial statements and other financial and
     operating data, including certain financial forecasts and other forward
     looking financial information, concerning Metamor prepared by the
     managements of Metamor and PSINet, respectively, and concerning Xpedior
     prepared by the managements of Xpedior, Metamor and PSINet,
     respectively;

  .  reviewed certain internal financial statements and other financial and
     operating data, including certain financial forecasts and other forward
     looking financial information (including, specifically, forecasts of
     certain revenue synergies and cost savings that are expected to result
     from the merger), concerning PSINet prepared by the management of
     PSINet;

  .  reviewed certain publicly available estimates of research analysts
     regarding Metamor, Xpedior and PSINet, respectively;

  .  held discussions with the respective managements of Metamor, Xpedior and
     PSINet concerning the businesses, past and current operations, financial
     condition and future prospects of each of Metamor, Xpedior and PSINet,
     independently and combined, including discussions with the managements
     of Metamor, Xpedior and PSINet concerning the expected synergies, as
     well as their views regarding the strategic rationale for the merger;

  .  reviewed the financial terms and conditions set forth in the merger
     agreement;

  .  reviewed the stock price and trading history of Metamor, Xpedior and
     PSINet;

  .  compared the financial performance of Metamor and Xpedior and the prices
     and trading activity of Metamor common stock and Xpedior common stock
     with that of certain other publicly traded companies comparable with
     Metamor and Xpedior;

  .  compared the financial terms of the merger with the financial terms, to
     the extent publicly available, of other transactions it deemed relevant;

  .  reviewed the pro forma impact of the merger on PSINet's EBITDA per share
     and revenue per share;

  .  prepared a discounted cash flow analysis for each of Metamor and
     Xpedior;

  .  participated in discussions among representatives of Metamor, Xpedior
     and PSINet and their financial and legal advisors; and

  .  made such other studies and inquiries, and reviewed such other data, as
     it deemed relevant.

   In its review and analysis, and in arriving at its opinion, Robertson
Stephens assumed and relied upon the accuracy and completeness of all of the
financial and other information provided to it (including information

                                       46
<PAGE>

furnished to it orally or otherwise discussed with it by the management of
Metamor, Xpedior and PSINet) or publicly available and neither attempted to
verify, nor assumed responsibility for verifying, any of such information.
Robertson Stephens relied upon the assurances of management of Metamor, Xpedior
and PSINet that they were not aware of any facts that would make such
information inaccurate or misleading. Furthermore, Robertson Stephens did not
obtain or make, or assume any responsibility for obtaining or making, any
independent evaluation or appraisal of the properties, assets or liabilities
(contingent or otherwise) of Metamor, Xpedior or PSINet, nor was Robertson
Stephens furnished with any such evaluation or appraisal.

   With respect to the financial forecasts and projections (and the assumptions
and bases therefor) for each of Metamor, Xpedior and PSINet that Robertson
Stephens reviewed (including the expected synergies), Robertson Stephens
assumed that such forecasts and projections (including the expected synergies):

  .  had been reasonably prepared in good faith on the basis of reasonable
     assumptions;

  .  reflected the best available estimates and judgments as to the future
     financial condition and performance of Metamor, Xpedior and PSINet,
     respectively; and

  .  will be realized in the amounts and in the time periods estimated.

   In this regard, Robertson Stephens noted that each of Metamor, Xpedior and
PSINet face exposure to the Year 2000 problem. Robertson Stephens did not
undertake any independent analysis to evaluate the reliability or accuracy of
the assumptions made by the managements of Metamor, Xpedior and PSINet with
respect to the potential effect that the Year 2000 problem might have on their
respective forecasts. Robertson Stephens also relied upon statements from
PSINet's management regarding the strategic value of the merger and its
assessment that the merger represents a compelling and significant strategic
opportunity for PSINet in the eServices segment.

   In addition, Robertson Stephens assumed that:

  .  the merger will be consummated upon the terms set forth in the merger
     agreement without material alteration thereof, including, among other
     things, that the merger will be accounted for as a "purchase method"
     business combination in accordance with U.S. generally accepted
     accounting principles (U.S. GAAP); and

  .  the historical financial statements of each of Metamor, Xpedior and
     PSINet reviewed by it had been prepared and fairly presented in
     accordance with U.S. GAAP consistently applied.

   Robertson Stephens relied as to all legal matters relevant to rendering its
opinion on the advice of counsel.

   Although developments following the date of the Robertson Stephens opinion
may affect the opinion, Robertson Stephens assumed no obligation to update,
revise or reaffirm its opinion. The Robertson Stephens opinion is necessarily
based upon market, economic and other conditions as in effect on, and
information made available to Robertson Stephens as of, the date of the
Robertson Stephens opinion. It should be understood that subsequent
developments may affect the conclusion expressed in the Robertson Stephens
opinion and that Robertson Stephens disclaims any undertaking or obligation to
advise any person of any change in any matter affecting the opinion which may
come or be brought to its attention after the date of the opinion. The
Robertson Stephens opinion is limited to the fairness, from a financial point
of view and as of the date thereof, of the exchange ratio to PSINet. Robertson
Stephens does not express any opinion as to:

  .  the value of any employee agreement or other arrangement entered into in
     connection with the merger;

  .  any tax or other consequences that might result from the merger; or

  .  what the value of PSINet common stock will be when issued to Metamor's
     stockholders pursuant to the merger or the price at which shares of
     PSINet common stock may be traded in the future.


                                       47
<PAGE>


   The following is a summary of the material financial analyses performed by
Robertson Stephens in connection with rendering the Robertson Stephens opinion.
The summary of the financial analyses is not a complete description of all of
the analyses performed by Robertson Stephens. Certain of the information in
this section is presented in a tabular form. IN ORDER TO BETTER UNDERSTAND THE
FINANCIAL ANALYSES PERFORMED BY ROBERTSON STEPHENS, THESE TABLES MUST BE READ
TOGETHER WITH THE TEXT OF EACH SUMMARY. THE ROBERTSON STEPHENS OPINION IS BASED
UPON THE TOTALITY OF THE VARIOUS ANALYSES PERFORMED BY ROBERTSON STEPHENS AND
NO PARTICULAR PORTION OF THE ANALYSES HAS ANY MERIT STANDING ALONE.

   As described in more detail below, using the results of these analyses,
Robertson Stephens derived an implied equity valuation for Metamor (including
the interest in Xpedior owned by Metamor) ranging from $1.533 billion to $2.312
billion, an implied equity value per share for Metamor (including its interest
in Xpedior) ranging from $34.34 to $51.81 and an implied exchange ratio for
Metamor (including its interest in Xpedior) ranging from 0.694 to 1.047:1.0.

  Metamor Analyses

   Robertson Stephens performed several analyses to determine implied valuation
ranges for Metamor, exclusive of its interest in Xpedior, as summarized below.

   Comparable Companies Analysis. Using publicly available information,
Robertson Stephens analyzed, among other things, the total capitalization and
trading multiples of Metamor and selected publicly traded companies in the IT
services industry that have similar business and operating profiles, including:

  .  American Management Systems, Inc.

  .  Cambridge Technology Partners, Inc.

  .  Complete Business Solutions, Inc.

  .  Computer Sciences Corporation

  .  Keane, Inc.

  .  MasTec, Inc.

  .  Metro Information Services, Inc.

  .  RCM Technologies, Inc.

   Multiples compared by Robertson Stephens included total capitalization to
revenues or estimated revenues and EBITDA and estimated EBITDA for calendar
years 1999, 2000 and 2001. All multiples were based on closing stock prices as
of March 17, 2000.

                                       48
<PAGE>

   Using the ranges of multiples set forth in the table below that Robertson
Stephens derived from multiples for the comparable companies, the following
Metamor equity values, Metamor equity values per share and exchange ratios were
implied (in each case, exclusive of Metamor's interest in Xpedior):

<TABLE>
<CAPTION>
                                                                                      Implied
                           Multiple      Implied Metamor     Implied Metamor Equity   Exchange
                            Range          Equity Value         Value Per Share        Ratio
                         ------------ ---------------------- ---------------------- ------------
<S>                      <C>          <C>                    <C>                    <C>
1999 Revenues...........  1.2x-- 1.8x   $715--$  979 million     $16.02--$21.93     0.324--0.443
2000 Revenues...........  1.0x-- 1.6x   $643--$  945 million     $14.40--$21.16     0.291--0.428
2001 Revenues...........  0.8x-- 1.3x   $643--$  957 million     $14.40--$21.45     0.291--0.433


1999 EBITDA.............  9.0x--15.0x   $664--$1,013 million     $14.87--$22.71     0.301--0.459
2000 EBITDA.............  8.0x--12.0x   $597--$  826 million     $13.38--$18.51     0.270--0.374
2001 EBITDA.............  7.5x--10.5x   $754--$1,000 million     $16.90--$22.41     0.341--0.453

   Robertson Stephens also applied a control premium of 40.0% to the results of
the foregoing analysis, which implied the following Metamor equity values,
equity values per share and exchange ratios (in each case, exclusive of
Metamor's interest in Xpedior):

<CAPTION>
                                                                                      Implied
                           Multiple      Implied Metamor     Implied Metamor Equity   Exchange
                            Range          Equity Value         Value Per Share        Ratio
                         ------------ ---------------------- ---------------------- ------------
<S>                      <C>          <C>                    <C>                    <C>
1999 Revenues...........  1.8x-- 2.9x $1,001--$1,370 million     $22.43--$30.70     0.453--0.620
2000 Revenues...........  1.5x-- 2.6x $  900--$1,322 million     $20.16--$29.63     0.407--0.599
2001 Revenues...........  1.2x-- 2.1x $  900--$1,340 million     $20.16--$30.03     0.407--0.607


1999 EBITDA............. 13.6x--24.3x $  929--$1,419 million     $20.82--$31.79     0.421--0.642
2000 EBITDA............. 12.2x--20.2x $  836--$1,157 million     $18.73--$25.92     0.378--0.524
2001 EBITDA............. 11.2x--17.1x $1,056--$1,400 million     $23.66--$31.38     0.478--0.634
</TABLE>

   Precedent Transaction Analysis. Using publicly available information,
Robertson Stephens analyzed the consideration offered and the implied
transaction value multiples paid or proposed to be paid in selected acquisition
transactions in the IT services industry, including:

  .  Entex-InfoTech Acquisition/CompuCom Systems, Inc. (Safeguard) (May 11,
     1999)

  .  Wang Global Inc./Getronics NV (May 4, 1999)

  .  Beechwood/The Cap Gemini Group (April 8, 1999)

  .  BancTec, Inc./Welsh Carson Anderson & Stowe (April 5, 1999)

  .  Analysis & Technology/Anteon Corp. (March 8, 1999)

  .  GE Capital Consulting/Metamor Worldwide, Inc. (March 5, 1999)

  .  Computer Management Sciences/Computer Associates (February 8, 1999)

  .  Decan/Metamor Worldwide, Inc. (February 4, 1999)

  .  Delphi Group, plc/Adecco SA (February 4, 1999)

  .  SPR Inc./Metamor Worldwide, Inc. (January 11, 1999)

  .  AtWeb, Inc./Netscape Communications (November 11, 1998)

  .  Strategix Solutions/Randstad Holding NV (August 27, 1998)

  .  Claremont Technology Group/Complete Business Solutions (April 9, 1998)

   In analyzing these "precedent transactions", Robertson Stephens compared,
among other things, the total consideration in such transactions as a multiple
of last twelve month (LTM) revenues and EBITDA and estimated next twelve month
(NTM) revenues. All multiples for the precedent transactions were based on

                                       49
<PAGE>

public information available at the time of the announcement. Based on this
information and other publicly available information, the following table
illustrates the implied Metamor equity valuations, Metamor equity valuations
per share and exchange ratios derived from applying a range of multiples that
Robertson Stephens derived from the precedent transactions (in each case,
exclusive of Metamor's interest in Xpedior):

<TABLE>
<CAPTION>
                                        Implied Metamor
                           Multiple          Equity        Implied Metamor Equity    Implied
                            Range          Valuation          Value Per Share     Exchange Ratio
                         ------------ -------------------- ---------------------- --------------
<S>                      <C>          <C>                  <C>                    <C>
LTM Revenues............  1.3x-- 2.3x $763--$1,242 million     $17.09--$27.84      0.345--0.562
NTM Revenues............  1.1x-- 1.9x $693--$1,096 million     $15.53--$24.55      0.314--0.496
LTM EBITDA.............. 12.0x--18.0x $839--$1,188 million     $18.79--$26.63      0.380--0.538
</TABLE>

   No company, business or transaction compared in the comparable companies
analysis or precedent transaction analysis is identical to Metamor, PSINet or
the merger. Accordingly, an analysis of the results of the foregoing is not
entirely mathematical; rather it involves complex considerations and judgments
concerning differences in financial and operating characteristics and other
factors that could affect the acquisition, public trading and other values of
the comparable companies, precedent transactions or the business segment,
company or transactions to which they are being compared.

   Discounted Cash Flow Analysis. Robertson Stephens performed a discounted
cash flow analysis of the after-tax free cash flows of Metamor for calendar
years 2000 through 2005. Robertson Stephens first discounted the projected,
after-tax free cash flows through December 31, 2005 using discount rates
ranging from 14.0% to 18.0%. Metamor after-tax free cash-flows were calculated
as the after-tax operating earnings of Metamor adjusted to add back non-cash
expenses and deduct uses of cash not reflected in the income statement.
Robertson Stephens then added to the present value of the cash flows the
terminal value of Metamor at December 31, 2005, discounted back at the same
discount rate to represent a present value. The terminal value was computed by
multiplying the projected EBITDA for Metamor in calendar year 2005 by terminal
multiples ranging from 8.0x to 10.0x. The range of terminal multiples selected
reflects Robertson Stephens' judgment as to an appropriate range of multiples
at the end of the reference period. The following table summarizes the
resulting implied equity valuations, equity values per share and exchange
ratios (in each case, exclusive of Metamor's interest in Xpedior):

<TABLE>
<CAPTION>
       Discount      Implied Metamor    Implied Metamor Equity    Implied
        Rates        Equity Valuation      Value Per Share     Exchange Ratio
       --------    -------------------- ---------------------- --------------
     <S>           <C>                  <C>                    <C>
     14.0%--18.0%  $994--$1,389 million     $22.26--$31.13      0.450--0.629
</TABLE>

  Xpedior Analyses

   Robertson Stephens also performed several analyses to determine implied
valuation ranges for Xpedior, as summarized below.

   Comparable Companies Analysis. Using publicly available information,
Robertson Stephens analyzed, among other things, the total capitalization and
trading multiples of Xpedior and the previously identified comparable companies
in the IT services industry, as well as the selected publicly traded companies
in the eBusiness consulting industry that have similar business and operating
profiles, including:

  .  AppNet, Inc.

  .  C-bridge Internet Solutions, Inc.

  .  Modem Media Poppe Tyson, Inc.

  .  Predictive Systems, Inc.

  .  Proxicom, Inc.

  .  Razorfish, Inc.


                                       50
<PAGE>

  .  Sapient Corporation

  .  Scient Corporation

  .  Tanning Technology Corp.

  .  U.S. Interactive, Inc.

  .  Viant Corp.

  .  Whittman-Hart, Inc.

   Multiples compared by Robertson Stephens included total capitalization to
revenues or estimated revenues for calendar years 1999, 2000 and 2001. All
multiples were based on closing stock prices as of March 17, 2000.

   In deriving an appropriate multiple range from these companies, Robertson
Stephens applied a weighting factor of 1/3 for the eBusiness companies and 2/3
for the IT services companies. Using the derived range of multiples set forth
in the table below, the following Xpedior equity values and equity values per
share are implied:

<TABLE>
<CAPTION>
                                                                     Implied
                                                                     Xpedior
                                Multiple      Implied Xpedior      Equity Value
                                  Range         Equity Value        Per Share
                               ----------- ---------------------- --------------
<S>                            <C>         <C>                    <C>
1999 Revenues................. 8.0x--12.0x $1,220--$1,793 million $20.49--$30.12
2000 Revenues................. 4.5x-- 7.0x $1,090--$1,655 million $18.31--$27.79
2001 Revenues................. 3.0x-- 4.5x $1,255--$1,846 million $21.08--$31.00
</TABLE>

   Precedent Transaction Analysis. Using publicly available information,
Robertson Stephens analyzed the consideration offered and the implied
transaction value multiples paid or proposed to be paid in selected acquisition
transactions in the eBusiness consulting industry, including:

  .  Tallan/CMGI Inc. (February 14, 2000)

  .  Cell Networks AB/Mandator AB (February 8, 2000)

  .  USWeb/CKS Corp./Whittman-Hart Inc. (December 13, 1999)

  .  I-Cube/Razorfish Inc. (August 10, 1999)

  .  International Network Services/Lucent Technologies Inc. (August 10,
     1999)

  .  Mitchell Madison Group/USWeb/CKS (July 30, 1999)

  .  Information Advantage Software/Sterling Software Inc. (July 15, 1999)

  .  Think New Ideas, Inc./Answerthink Consulting Group (June 24, 1999)

  .  Computer Management Sciences/Computer Associates (February 8, 1999)

  .  Strategic Decision Group/Metzler Group (February 8, 1999)

   In analyzing these "precedent transactions", Robertson Stephens compared,
among other things, the total consideration in such transactions as a multiple
of LTM revenues and estimated NTM revenues. All multiples for the precedent
transactions were based on public information available at the time of the
announcement. Based on this information and other publicly available
information, the following table illustrates the implied Xpedior equity
valuations and equity valuations per share derived from applying a range of
multiples that Robertson Stephens derived from the precedent transactions:


                                       51
<PAGE>

<TABLE>
<CAPTION>

                                                                     Implied
                                                                     Xpedior
                                Multiple      Implied Xpedior      Equity Value
                                  Range       Equity Valuation      Per Share
                               ----------- ---------------------- --------------
     <S>                       <C>         <C>                    <C>
     LTM Revenues............. 8.0x--12.0x $1,220--$1,793 million $20.49--$30.12
     NTM Revenues............. 4.5x-- 7.5x $1,090--$1,768 million $18.31--$29.69
</TABLE>

   No company, business or transaction compared in the comparable companies
analysis or precedent transaction analysis is identical to Metamor, Xpedior,
PSINet or the merger. Accordingly, an analysis of the results of the foregoing
is not entirely mathematical; rather it involves complex considerations and
judgments concerning differences in financial and operating characteristics and
other factors that could affect the acquisition, public trading and other
values of the comparable companies, precedent transactions or the business
segment, company or transactions to which they are being compared.

   Discounted Cash Flow Analysis. Robertson Stephens performed a discounted
cash flow analysis of the after-tax free cash flows of Xpedior for calendar
years 2000 through 2005. Robertson Stephens first discounted the projected,
after-tax free cash flows through December 31, 2005 using discount rates
ranging from 25.0% to 35.0%. Xpedior after-tax free cash-flows were calculated
as the after-tax operating earnings of Xpedior adjusted to add back non-cash
expenses and deduct uses of cash not reflected in the income statement.
Robertson Stephens then added to the present value of the cash flows the
terminal value of Xpedior at December 31, 2005, discounted back at the same
discount rate to represent a present value. The terminal value was computed by
multiplying the projected EBITDA for Xpedior in calendar year 2005 by terminal
multiples ranging from 10.0x to 12.0x. The range of terminal multiples selected
reflects Robertson Stephens' judgment as to an appropriate range of multiples
at the end of the reference period. The following table summarizes the
resulting implied equity valuations and equity values per share:

<TABLE>
<CAPTION>

                                                                     Implied
                                                                     Xpedior
                                              Implied Xpedior      Equity Value
                Discount Rates                Equity Valuation      Per Share
                --------------             ---------------------- --------------
     <S>                                   <C>                    <C>
     25.0%--35.0%......................... $1,289--$2,294 million $21.65--$38.53
</TABLE>

   Summation of the Metamor Analyses and the Xpedior Analyses

   Using the results of the above Metamor analyses and Xpedior analyses,
Robertson Stephens derived implied valuation ranges for each of Metamor
(exclusive of its interest in Xpedior) and Xpedior and added such ranges to
derive an aggregate implied valuation range for Metamor. The following table
summarizes the implied Metamor equity valuations, equity valuations per share
and exchange ratios based on the combined value of Metamor and its
approximately 67% ownership interest in Xpedior on a fully diluted as converted
basis:

<TABLE>
<CAPTION>
                                                                  Implied
                                                               Metamor Equity
                                              Implied            Value Per       Implied
                                          Equity Valuation         Share      Exchange Ratio
                                      ------------------------ -------------- --------------
   <S>                                <C>                      <C>            <C>
   Metamor (exclusive of Xpedior)...  $  730 -- $1,064 million $16.37--$23.83  0.331--0.481
   Xpedior..........................  $1,194 -- $1,858 million       --             --
   67% of Xpedior Owned by Metamor..  $  802 -- $1,248 million $17.98--$27.97  0.363--0.565
   Metamor Total....................  $1,533 -- $2,312 million $34.34--$51.81  0.694--1.047
</TABLE>

   Other Analyses

   Exchange Ratio Analysis. Robertson Stephens compared the historical ratios
of the closing price of Metamor common stock to the closing price of PSINet
common stock over various periods. The following table sets forth certain
ratios of the closing prices of Metamor common stock compared to PSINet common
stock for various periods ending March 17, 2000:


                                       52
<PAGE>

<TABLE>
<CAPTION>
                                            Ratio of closing prices
                                            of Metamor Common Stock
                                                  Compared to
                                              PSINet Common Stock
                                  -----------------------------------------------------------------
      Period Ending
      March 17, 2000              Average                        High                         Low
      --------------              -------                       ------                       ------
     <S>                          <C>                           <C>                          <C>
     5 trading days               0.330x                        0.349x                       0.312x
     10 trading days              0.324x                        0.349x                       0.299x
     20 trading days              0.378x                        0.469x                       0.299x
     30 trading days              0.433x                        0.644x                       0.299x
     LTM trading days             0.811x                        1.279x                       0.299x
</TABLE>

   Deal Premium Analysis. Robertson Stephens also considered the premium that
an exchange ratio of 0.900x (which implied a price per share of $44.55 based on
the closing price of PSINet common stock on March 21, 2000) represented to the
closing price of Metamor common stock over various periods. The results of this
analysis are summarized below:

<TABLE>
<CAPTION>
                                                               Five   Premium to
                                                       Days     Day    Five Day
                                                     Prior to Average  Average
                                                      March   Metamor  Metamor
     Date                                            17, 2000  Price    Price
     ----                                            -------- ------- ----------
     <S>                                             <C>      <C>     <C>
     March 17, 2000.................................      --  $16.78    165.6%
     March 6, 2000..................................  10 days $20.15    121.1%
     February 4, 2000...............................  30 days $28.56     56.0%
     December 23, 1999..............................  60 days $29.63     50.3%
     November 9, 1999...............................  90 days $21.98    102.7%
     July 2, 1999................................... 180 days $23.19     92.1%
     March 16, 1999.................................   1 year $14.74    202.3%
</TABLE>

   Pro Forma Analyses. Robertson Stephens analyzed certain pro forma effects
resulting from the merger, including, among other things, the impact of the
merger on the projected revenue per share and EBITDA per share of the combined
company for fiscal years 2000 and 2001. The following table summarizes the
results of such analysis assuming no synergies (accretion was greater in fiscal
year 2001 assuming synergies):

<TABLE>
     <S>                                                                   <C>
     Fiscal Year 2000 estimated revenue per share accretion............... 20.5%
     Fiscal Year 2001 estimated revenue per share accretion............... 27.2%
     Fiscal Year 2000 estimated EBITDA per share accretion................ 22.1%
     Fiscal Year 2001 estimated EBITDA per share accretion................ 28.2%
</TABLE>

   The actual results achieved by the combined company may vary from projected
results and the variations may be material.

   Other Factors and Comparative Analyses. In rendering its opinion, Robertson
Stephens considered certain other factors and conducted certain other
comparative analyses, including, among other things, a review of selected
published analysts' reports on Metamor, Xpedior and PSINet.

   While the foregoing summary describes certain analyses and factors that
Robertson Stephens deemed material in its presentation to the PSINet board, it
is not a comprehensive description of all analyses and factors considered by
Robertson Stephens. The preparation of a fairness opinion is a complex process
that involves various determinations as to the most appropriate and relevant
methods of financial analysis and the application of these methods to the
particular circumstances and, therefore, such an opinion is not readily
susceptible to summary description. Robertson Stephens believes that its
analyses must be considered as a whole and that selecting portions of its
analyses and of the factors considered by it, without considering all analyses
and factors, would create an incomplete view of the evaluation process
underlying the Robertson Stephens opinion. Several analytical methodologies
were employed and no one method of analysis should be regarded as critical

                                       53
<PAGE>

to the overall conclusion reached by Robertson Stephens. Each analytical
technique has inherent strengths and weaknesses, and the nature of the
available information may further affect the value of particular techniques.
The conclusions reached by Robertson Stephens are based on all analyses and
factors taken as a whole and also on application of Robertson Stephens' own
experience and judgment. Such conclusions may involve significant elements of
subjective judgment and qualitative analysis. Robertson Stephens therefore
gives no opinion as to the value or merit standing alone of any one or more
parts of the analysis it performed. In performing its analyses, Robertson
Stephens considered general economic, market and financial conditions and other
matters, many of which are beyond the control of Metamor, Xpedior and PSINet.
The analyses performed by Robertson Stephens are not necessarily indicative of
actual values or future results, which may be significantly more or less
favorable than those suggested by such analyses. Accordingly, analyses relating
to the value of a business do not purport to be appraisals or to reflect the
prices at which the business actually may be purchased. Furthermore, no opinion
is being expressed as to the prices at which shares of Metamor common stock,
Xpedior common stock or PSINet common stock may be traded at any future time.

   The engagement letter between Robertson Stephens and PSINet provides that
Robertson Stephens is entitled to receive a fee for its services, a substantial
portion of which is contingent upon completion of the merger. PSINet has also
agreed to reimburse Robertson Stephens for certain of its out-of-pocket
expenses, including legal fees, and to indemnify and hold harmless Robertson
Stephens and its affiliates and any director, employee or agent of Robertson
Stephens or any of its affiliates, or any person controlling Robertson Stephens
or its affiliates for certain losses, claims, damages, expenses and liabilities
relating to or arising out of services provided by Robertson Stephens as
financial advisor to PSINet. The terms of the fee arrangement with Robertson
Stephens, which PSINet and Robertson Stephens believe are customary in
transactions of this nature, were negotiated at arm's length between PSINet and
Robertson Stephens, and the PSINet board was aware of such fee arrangements,
including the fact that a significant portion of the fees payable to Robertson
Stephens is contingent upon completion of the merger. Robertson Stephens has
provided certain investment banking services to PSINet for which it has been
paid fees, including acting as financial advisor to PSINet with respect to
certain acquisitions and minority investments. Robertson Stephens maintains a
market in the shares of PSINet common stock. In the ordinary course of its
business, Robertson Stephens may trade in PSINet's securities, Metamor's
securities and Xpedior's securities for its own account and the account of its
customers and, accordingly, may at any time hold a long or short position in
PSINet's securities, Metamor's securities or Xpedior's securities.

   Robertson Stephens was retained based on Robertson Stephens' experience as a
financial advisor in connection with mergers and acquisitions and in securities
valuations generally, as well as Robertson Stephens' investment banking
relationship and familiarity with PSINet.

   Robertson Stephens is an internationally recognized investment banking firm.
As part of its investment banking business, Robertson Stephens is frequently
engaged in the valuation of businesses and their securities in connection with
mergers and acquisitions, negotiated underwritings, secondary distributions of
securities, private placements and other purposes.

Opinion of Metamor's Financial Advisor

   On March 21, 2000, Lazard delivered its oral opinion to Metamor's board of
directors, which opinion was subsequently confirmed in writing, to the effect
that, as of March 21, 2000, based upon and subject to the various
considerations set forth in its opinion, the exchange ratio in connection with
the merger is fair to the holders of Metamor common stock from a financial
point of view.

   The full text of the Lazard opinion, dated March 21, 2000, which sets forth
the assumptions made, matters considered and limitations on the review
undertaken in connection with this opinion, is attached hereto as Annex 3. This
summary discussion of such opinion of Lazard is qualified in its entirety by
reference to the full text of such opinion.


                                       54
<PAGE>

   The engagement of Lazard and its opinion are for the benefit of Metamor's
board of directors and its opinion was rendered to Metamor's board of
directors in connection with Metamor's board of directors' consideration of
the merger. Lazard's opinion is directed only to the fairness of the exchange
ratio from a financial point of view to the holders of Metamor common stock
and does not address any other aspects of the merger. The Lazard opinion does
not constitute, and should not be construed as, a recommendation to any holder
of Metamor common stock as to how such holder should vote with respect to the
merger. Holders of Metamor's common stock are urged to read the Lazard opinion
in its entirety.

   In connection with rendering its opinion, dated March 21, 2000, to
Metamor's board of directors, Lazard:

  .  reviewed the financial terms and conditions of a draft merger agreement
     dated March 21, 2000;

  .  analyzed certain historical business and financial information relating
     to PSINet, Metamor and Xpedior;

  .  reviewed various financial forecasts and other data provided to Lazard
     by PSINet and Metamor relating to their respective businesses including,
     in the case of Metamor, Xpedior's business;

  .  held discussions with members of the senior management of PSINet,
     Metamor and Xpedior with respect to the businesses and prospects of
     PSINet, Metamor and Xpedior, respectively, and the strategic objectives
     of each;

  .  reviewed public information with respect to certain other companies in
     lines of businesses Lazard believed to be generally comparable to those
     of PSINet, Metamor and Xpedior;

  .  reviewed the financial terms of certain business combinations involving
     companies in lines of business Lazard believed to be generally
     comparable to those of Metamor and Xpedior;

  .  reviewed the historical stock prices and trading volumes of shares of
     PSINet common stock, Metamor common stock and Xpedior common stock; and

  .  conducted such other financial studies, analyses and investigations as
     it deemed appropriate.

   Lazard relied upon the accuracy and completeness of the foregoing
information and did not assume any responsibility for any independent
verification of such information or any independent valuation or appraisal of
any of the assets or liabilities of PSINet, Metamor or Xpedior, or concerning
the solvency of or issues relating to solvency concerning PSINet, Metamor or
Xpedior. With respect to the financial forecasts, Lazard assumed that they had
been reasonably prepared on bases reflecting the best currently available
estimates and judgments of the managements of PSINet, Metamor and Xpedior as
to the future financial performance of PSINet, Metamor and Xpedior,
respectively. Lazard assumed no responsibility for and expressed no view as to
such forecasts or the assumptions on which they were based.

   The written opinion of Lazard was necessarily based on economic, monetary,
market and other conditions as in effect on, and the information made
available to it as of, March 21, 2000. In rendering its opinion, Lazard did
not address the relative merits of the merger, any alternative potential
transaction or Metamor's underlying decision to effect the merger. In that
regard, Lazard was not authorized by Metamor to solicit, nor did Lazard
solicit, third-party indications of interest for the acquisition of all or any
part of Metamor.

   In rendering its opinion, Lazard assumed that the merger would be
consummated on the terms described in the draft merger agreement dated March
21, 2000, without any waiver of any material terms or conditions by Metamor
and that obtaining the necessary regulatory approvals, if any, for the merger
would not have an adverse effect on Metamor, PSINet or Xpedior. Lazard also
assumed that the definitive merger agreement would not differ in any material
respects from the draft furnished to it.

   The following is a summary of the material financial and comparative
analyses performed by Lazard in connection with providing to, and reviewing
with, Metamor's board of directors its oral opinion at the meeting of
Metamor's board of directors on March 21, 2000.

                                      55
<PAGE>

   Comparable Publicly Traded Companies Analysis. Lazard compared certain
actual and estimated financial, operating and stock market information for
Metamor, not including its equity interest in Xpedior (the "Metamor Residual"),
and for a group of publicly traded companies in lines of business which Lazard
believed to be reasonably comparable to those of the Metamor Residual in the
traditional IT solutions industry. The selected public companies included in
the Metamor Residual comparable company analysis (collectively defined as the
"Metamor Residual Comparable Companies") included:

  .  Affiliated Computer Services, Inc.;

  .  American Management Systems, Incorporated;

  .  Cambridge Technology Partners (Massachusetts), Inc.;

  .  Complete Business Solutions, Inc.;

  .  Computer Horizons Corp.; and

  .  Keane, Inc.

   Lazard compared the market value of each of the Metamor Residual Comparable
Companies as a multiple of its estimated 2000 cash net income (determined by
adjusting GAAP net income for the after-tax stock compensation charges and
goodwill). This analysis indicated that the Metamor Residual Comparable
Companies' market value as a multiple of 2000 estimated cash net income was as
follows:

<TABLE>
<CAPTION>
                                                               Low  Median High
                                                              ----- ------ -----
      <S>                                                     <C>   <C>    <C>
      2000 Estimated Cash Net Income......................... 15.2x 20.0x  38.4x
</TABLE>

   Based on the Metamor Residual Comparable Companies' market value as a
multiple of 2000 estimated cash net income above, Lazard developed a valuation
multiple range to apply to the Metamor Residual 2000 estimated cash net income.
This analysis resulted in an implied value range per share of the Metamor
Residual of $12.47 to $14.68.

   Lazard also compared certain actual and estimated financial, operating and
stock market information for Xpedior, and for two groups of publicly traded
companies in lines of business which Lazard believed to be reasonably
comparable to those of Xpedior in the Internet based IT solutions industry. The
selected public companies included in the first group of the Xpedior comparable
company analysis (collectively defined as the "Xpedior Group One Comparable
Companies") included:

  .  AGENCY.COM Ltd.;

  .  AppNet, Inc.; and

  .  Luminant Worldwide Corporation.

   The selected public companies included in the second group of the Xpedior
comparable company analysis (collectively defined as the "Xpedior Group Two
Comparable Companies") included:

  .  Braun Consulting, Inc.;

  .  iXL Enterprises, Inc.;

  .  Proxicom, Inc.;

  .  Razorfish, Inc.;

  .  Sapient Corporation;

  .  Scient Corporation; and

  .  Viant Corporation.


                                       56
<PAGE>

   Lazard compared the enterprise value of each of the Xpedior Group One
Comparable Companies and the Xpedior Group Two Comparable Companies as a
multiple of its estimated 2000 revenue. This analysis indicated that the
Xpedior Group One Comparable Companies' and the Xpedior Group Two Comparable
Companies' enterprise value as a multiple of 2000 estimated revenue were as
follows:


<TABLE>
<CAPTION>
                                                                     Low   High
                                                                    ----- ------
      <S>                                                           <C>   <C>
      Group One 2000 Estimated Revenue............................. 2.36x  9.10x
      Group Two 2000 Estimated Revenue............................. 7.90x 30.72x
</TABLE>

   Based on the Xpedior Group One Comparable Companies' and the Xpedior Group
Two Comparable Companies' enterprise value as a multiple of 2000 estimated
revenue above, Lazard developed a valuation multiple range to apply to
Xpedior's 2000 estimated revenue. This analysis resulted in an implied value
range per share of Xpedior common stock of $18.65 to $27.55, which results in
an implied market value to Metamor of its equity interest of Xpedior common
stock of $19.89 to $30.11 per share of Metamor common stock.

   Based upon the foregoing data and projections for Metamor and Xpedior
provided to Lazard, the implied per share equity valuation of Metamor common
stock analyzing the Metamor Residual and Xpedior on a "sum-of-the-parts" basis
was estimated to range from $32.00 to $45.00.

   Selected Precedent Transaction Analysis. Lazard reviewed selected financial,
operating and stock market information relating to selected acquisition
transactions in the traditional IT solutions industry. The selected traditional
IT solutions precedent transactions included in the Metamor Residual precedent
transaction analysis (collectively defined as the "Metamor Residual Precedent
Transactions") included:

  .  Compuware Corporation/Data Processing Resources Corporation (June 1999);

  .  Electronic Data Systems Corporation/MCI Systemhouse (February 1999);

  .  Computer Task Group, Incorporated/Elumen Solutions, Inc. (January 1999);

  .  Affiliated Computer Services, Inc./BRC Holdings, Inc. (October 1998);

  .  First Consulting Group, Inc./Integrated Systems Consulting Group, Inc.
     (September 1998);

  .  Data Processing Resources Corporation/Systems & Programming Consultants,
     Inc. (June 1998);

  .  CIBER, Inc./The Summit Group, Inc. (April 1998);

  .  Complete Business Solutions, Inc./Claremont Technology Group, Inc.
     (April 1998); and

  .  Renaissance Worldwide, Inc./Triad Data, Inc. (April 1998).

   Lazard compared the enterprise value of each of the Metamor Residual
Precedent Transactions as a multiple of the latest twelve months' ("LTM") net
income at the time of the announcement of such Metamor Residual Precedent
Transaction. This analysis indicated that the Metamor Residual Precedent
Transactions' enterprise value as a multiple of LTM net income was as follows:

<TABLE>
<CAPTION>
                                                               Low  Median High
                                                              ----- ------ -----
      <S>                                                     <C>   <C>    <C>
      LTM Net Income......................................... 16.1x 28.0x  51.6x
</TABLE>

   Based on the Metamor Residual Precedent Transactions' enterprise value as a
multiple of LTM net income above, Lazard developed a valuation multiple range
to apply to the Metamor Residual 1999 actual net income. This analysis resulted
in an implied value range per share of the Metamor Residual of $11.76 to
$14.11.

   Lazard also reviewed selected financial, operating and stock market
information relating to selected acquisition transactions in the Internet based
IT solutions industry. The selected Internet based IT solutions

                                       57
<PAGE>

precedent transactions included in the Xpedior precedent transaction analysis
(collectively defined as the "Xpedior Precedent Transactions") included:

  .  Whittman-Hart, Inc./USWeb Corporation (December 1999);

  .  Braun Consulting, Inc./Emerging Technologies Consultants, Inc. (December
     1999);

  .  Razorfish, Inc./International Integration Incorporated (August 1999);

  .  AnswerThink Consulting Group, Inc./THINK New Ideas, Inc. (June 1999);
     and

  .  Sapient Corporation/Adjacency, Inc. (March 1999).

   Lazard compared the enterprise value of each of the Xpedior Precedent
Transactions as a multiple of its LTM revenue. This analysis indicated that the
Xpedior Precedent Transactions' enterprise value as a multiple of LTM revenue
was as follows:

<TABLE>
<CAPTION>
                                                            Low    Median  High
                                                           ------  ------ ------
      <S>                                                  <C>     <C>    <C>
      LTM Revenue.........................................  4.22x  9.99x  14.10x
</TABLE>

   Based on the Xpedior Precedent Transactions' enterprise value as a multiple
of LTM revenue above, Lazard developed a valuation multiple range to apply to
Xpedior's 1999 actual revenue. This analysis resulted in an implied value range
per Xpedior Share of $23.72 to $28.80, which results in an implied market value
to Metamor of its equity interest of Xpedior common stock of $25.79 to $31.53
per share of Metamor common stock.

   Based upon such information for the Metamor Residual Precedent Transactions
and the Xpedior Precedent Transactions, the implied per share equity valuation
of Metamor common stock analyzing the Metamor Residual and Xpedior on a "sum-
of-the-parts" basis was estimated to range from $37.00 to $46.00.

   Stock Trading History. Lazard examined the historical trading prices and
volumes for Metamor common stock during the 52-week period ending on March 17,
2000. Lazard indicated that based on the closing stock price of PSINet common
stock on March 17, 2000 of $49.75 per share, the exchange ratio implied a
188.9% premium over the closing price per share of Metamor common stock, on
March 17, 2000. The following is the intra-day price of Metamor common stock
and the implied exchange ratio per share of Metamor common stock to PSINet
common stock:

<TABLE>
<CAPTION>
                                                                Metamor Implied
                                                                 Stock  Exchange
                                                                 Price   Ratio
                                                                ------- --------
      <S>                                                       <C>     <C>
      Market price on 3/17/00.................................. $15.50   0.312x
      Ten-day prior average ending on 3/17/00.................. $17.73   0.356x
      Three-month average ending on 3/17/00.................... $24.66   0.496x
      One-year average ending on 3/17/00....................... $21.41   0.430x
      52-Week High (12/13/99).................................. $41.63   0.837x
      52-Week Low (4/9/99)..................................... $12.56   0.253x
</TABLE>

   Pro Forma Contribution Analysis. Lazard analyzed the relative contributions
by Metamor and PSINet to the pro forma combined companies and compared the
relative contribution by Metamor to certain financial data for the pro forma
combined companies. These analyses indicated that Metamor's pro forma ownership
percentage of the pro forma combined companies was 17% and that the relative
contribution by Metamor to certain financial data for the pro forma combined
companies was as follows:

<TABLE>
<CAPTION>
                                                          Metamor's Percentage
                                                              Contribution
                                                          --------------------
      <S>                                                 <C>
      2000 Estimated Revenue.............................          41%
      2001 Estimated Revenue.............................          36%
</TABLE>

                                       58
<PAGE>

<TABLE>
<CAPTION>
                                                           Metamor's Percentage
                                                               Contribution
                                                           --------------------
      <S>                                                  <C>
      2000 Estimated EBITDA...............................          43%
      2001 Estimated EBITDA...............................          36%
      Enterprise Value....................................           6%
      Net Debt............................................           9%
      Equity Value........................................           5%
</TABLE>

   The summary set forth above does not purport to be a complete description of
the analysis performed by Lazard, although it is a summary of the material
financial and comparative analyses performed by Lazard in arriving at its
opinion. The preparation of a fairness opinion is a complex process and is not
necessarily susceptible to partial analysis or summary description. Selecting
portions of the analyses or of the summary set forth above without considering
the analyses as a whole could create an incomplete or misleading view of the
process underlying the Lazard opinion. No company or transaction used in the
above analysis as a comparison is identical to Metamor or Xpedior or the
transaction contemplated by the merger agreement. In arriving at its opinion,
Lazard considered the results of all such analyses and did not assign relative
weights to any of the analyses. The analyses were prepared solely for purposes
of Lazard providing its opinion that, as of March 21, 2000, the exchange ratio
is fair to the holders of Metamor common stock from a financial point of view,
and do not purport to be appraisals or necessarily reflect the prices at which
businesses or securities actually may be sold, which may be significantly more
or less favorable than as set forth in these analyses. Similarly, any estimate
of values or forecast of future results contained in the analyses is not
necessarily indicative of actual values or actual future results, which may be
significantly more or less favorable than those suggested by such analyses.

   In performing its analyses, Lazard made numerous assumptions with respect to
industry performance, general business and economic conditions and other
matters. Because such analyses are inherently subject to uncertainty, being
based upon numerous factors or events beyond the control of the parties or
their respective advisors, none of PSINet, Metamor or Xpedior, Lazard or any
other person assumes responsibility if future results or actual values are
materially different from those forecasts or estimates contained in the
analyses.

   Lazard is an internationally recognized investment banking firm and is
continually engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, secondary
distributions of listed and unlisted securities, private placements, leveraged
buyouts, and valuations for estate, corporate and other purposes. Metamor's
board of directors selected Lazard to act as its investment banker because of
Lazard's expertise and its reputation in investment banking and mergers and
acquisitions.

   In connection with Lazard's services as investment banker to Metamor,
Metamor has agreed to pay Lazard a customary fee for its services, a
substantial portion of which is contingent upon the consummation of the merger.
Lazard has in the past provided financial advisory services to Metamor for
which it received usual and customary compensation. Metamor has also agreed to
reimburse Lazard for its reasonable out-of-pocket expenses (including fees of
its outside legal counsel) and to indemnify Lazard and certain related parties
against certain liabilities, including liabilities arising under the federal
securities laws, relating to, or arising out of, its engagement.

   In the ordinary course of its business, Lazard and its affiliates may
actively trade in the securities of Metamor for its own account and for the
account of its customers and, accordingly, may at any time hold a long or short
position.

Interests of Metamor Directors and Management in the Merger

   In considering the recommendation of Metamor's board of directors in favor
of the merger, stockholders of Metamor should be aware that the directors and
executive officers of Metamor have interests in the merger

                                       59
<PAGE>

that are different from, or in addition to, the interests of stockholders of
Metamor. Those interests relate to or arise from, among other things, the terms
of the merger agreement providing for the continued indemnification of current
directors and officers of Metamor, the accelerated vesting of some outstanding
Metamor and Xpedior stock options and the continuation of Metamor employee
benefits.

   Indemnification and Insurance. The merger agreement provides that all rights
of indemnification and exculpation from liabilities existing in favor of the
current and former directors or officers of Metamor and its subsidiaries as
provided in their respective certificates of incorporation and by-laws of
Metamor will be assumed by the surviving corporation in the merger, and will
continue in full force and effect with respect to their activities prior to the
merger in accordance with their terms for at least six years after the
effective time of the merger. In addition, PSINet will provide similar
indemnification of the Metamor directors and officers. The merger agreement
provides that for three years after the effective time of the merger, PSINet
will maintain directors' and officers' liability insurance for acts or
omissions occurring prior to the effective time of the merger covering those
persons who were, as of the date of the merger agreement, covered by Metamor's
directors' and officers' liability insurance policy, on terms no less favorable
than those in effect on the date of the merger agreement.

   Employment Agreements. Metamor has employment agreements with each of
Messrs. Dameris, Pierce and Tusa and Ms. Reed. The employment agreements for
Messrs. Dameris and Pierce generally provide for severance benefits equal to
one year of base salary in the event of termination upon death or total
disability or upon non-renewal after the initial term; two years of base salary
in the event of termination without cause or constructive termination; and two
years of base compensation plus one year of bonus and the acceleration of
vesting of all outstanding options in the event of a change of control and
termination without cause or constructive termination. The employment
agreements for Mr. Tusa and Ms. Reed generally provide for severance benefits
equal to one year of base salary in the event of termination upon death or
total disability or upon non-renewal after the initial term; eighteen months of
base salary in the event of termination without cause or constructive
termination; and eighteen months of base compensation plus one year of bonus
and the acceleration of vesting of all outstanding options in the event of a
change of control and termination without cause or constructive termination.
These agreements will be amended in May 2000 to provide that (i) the severance
benefit will be increased by the amount of any excise taxes imposed in respect
of the severance payment by Section 4999 of the Internal Revenue Code and
income taxes and excise taxes thereon in the event that, after a change of
control, the employee is involuntarily discharged without cause or the employee
terminates his or her employment because of a reduction in base compensation, a
demotion to an inferior job or a requirement to relocate outside the Houston,
Texas metropolitan area, and (ii) vested options held by the employee upon
termination may be exercised for a period of 15 months after termination. The
merger will constitute a change of control for purposes of these agreements.

   Metamor Options. Under terms of Metamor's Long-Term Incentive Plan, all
options granted prior to January 1, 1999, totaling approximately 1,151,000
options as of the record date (of which 539,014 were not presently vested) will
automatically vest under the terms of the Plan as a result of the merger. In
addition, options to purchase approximately 35,000 shares of common stock
granted to Metamor's non-employee directors (including options to purchase
28,000 shares scheduled to be granted to Metamor's non-employee directors at
its annual meeting) will fully vest upon consummation of the merger. In
addition to 96,700 options held by Messrs. Dameris, Pierce and Tusa and Ms.
Reed that will automatically vest as a result of the merger, such persons hold
options to purchase 477,500 shares of common stock that will automatically vest
under the terms of the plan in the event of their termination without cause or
constructive termination after the merger.

   Xpedior Options. Under terms of Xpedior's Stock Incentive Plan, options to
purchase 620,000 shares of Xpedior common stock granted to Metamor employees
and directors will automatically vest under the terms of the plan in the event
of a change of control of Metamor, including the merger, and the termination
without cause or constructive termination of such employees.


                                       60
<PAGE>


   PSINet Options. In the event that PSINet and Mr. Dameris reach agreement on
the terms of an employment agreement, upon consummation of the merger, PSINet
will grant Mr. Dameris options to purchase 100,000 shares of PSINet common
stock at the then current market price containing vesting and other terms and
conditions to be determined.

Tax Treatment

   Completion of the merger is conditioned upon its being treated as a
reorganization within the meaning of Section 368(a) of the Internal Revenue
Code and the receipt by PSINet and Metamor of opinions from Nixon Peabody LLP
and/or Vinson & Elkins L.L.P. that the merger qualifies as a reorganization
under such section.

Form of the Merger

   Subject to the terms and conditions of the merger agreement and in
accordance with Delaware law, at the effective time of the merger, PSINet Shelf
IV Inc. will be merged with and into Metamor. The separate existence of PSINet
Shelf IV Inc. will cease and Metamor will survive the merger as a wholly owned
Delaware subsidiary of PSINet.

Merger Consideration

   In the merger, each share of outstanding Metamor stock will be converted
into the right to receive 0.9 of a share of PSINet common stock. If, at any
time during the period between the date of the merger agreement and the merger,
the number of shares of Metamor common stock or PSINet common stock issued and
outstanding is adjusted as a result of a stock split, reverse stock split,
stock dividend, recapitalization, redenomination of share capital or other
similar transaction with an effective date or record date prior to the merger,
the exchange ratio and any other items dependent on the exchange ratio will be
appropriately adjusted.

   Metamor stockholders will receive cash for any fractional shares of PSINet
common stock which they would otherwise receive in the merger. As of the
effective time of the merger, all shares of Metamor common stock will
automatically be canceled and will cease to exist, and each holder of a
certificate representing any shares of Metamor common stock will cease to have
any rights as a stockholder except the right to receive PSINet common stock and
cash in lieu of fractional shares.

Conversion of Shares; Procedures for Exchange of Certificates; Fractional
Shares

   The conversion of Metamor common stock into the right to receive PSINet
common stock will occur automatically at the effective time of the merger.
First Chicago Trust Company, as the paying agent, will provide instructions to
Metamor stockholders for surrendering their Metamor stock certificates promptly
following the merger. Metamor stockholders should not return stock certificates
with the enclosed proxy.

   Following the merger, each holder of a certificate representing Metamor
common stock will be asked to surrender and deliver the certificate to the
paying agent together with a properly completed and executed transmittal
letter. Promptly after surrender and delivery, the holder will receive a
certificate representing the number of whole shares of PSINet common stock for
which the holder's shares of Metamor common stock has been converted, together
with a check for any cash in lieu of any fractional share of PSINet common
stock. Until so surrendered and exchanged, each certificate formerly
representing an outstanding share of Metamor common stock will be treated for
all purposes to evidence only the right to receive PSINet common stock and any
cash payable in lieu of fractional shares. The merger agreement provides that
Metamor stockholders' rights as shareholders of PSINet will commence when the
merger occurs; however, any dividends or distributions will not be paid to a
Metamor stockholder until such stockholder has surrendered his or her Metamor
stock certificate(s).

   At the effective time, the stock transfer books of Metamor will be closed
and no transfer of shares of Metamor common stock will be made after that,
other than registration of transfers of shares of Metamor

                                       61
<PAGE>

common stock that occurred prior to the effective time. If certificates
representing Metamor common stock are presented for transfer to the transfer
agent for Metamor, PSINet or PSINet Shelf IV Inc. after the effective time,
they will be delivered to the paying agent and exchanged for PSINet common
stock and any cash payable in lieu of fractional shares.

   Any shares of PSINet common stock or any cash that remains undistributed to
Metamor stockholders after four months have elapsed following the effective
time will be delivered to PSINet by the paying agent, upon demand, and any
former stockholders of Metamor who have not previously complied with these
procedures for exchange may look only to PSINet for payment of their claim for
PSINet common stock and any cash payable in lieu of fractional shares.

   Neither the paying agent nor any of Metamor, PSINet or PSINet Shelf IV Inc.
will be liable to any holder of shares of Metamor common stock with respect to
any shares of PSINet common stock (or dividends or distributions with respect
to PSINet common stock) delivered to a public official pursuant to any
applicable abandoned property, escheat or similar law, rule, regulation,
statute, order, judgment or decree.

   If any Metamor certificates have been lost, stolen or destroyed, the paying
agent may require the claiming holder to make an affidavit of that fact and
deliver a bond as the paying agent may reasonably require, and the paying agent
may then issue the PSINet common stock and pay any cash payable in lieu of
fractional shares to which the holder of the lost, stolen or destroyed
certificates is entitled.

   Stockholders of Metamor will not be required to pay any transfer taxes with
respect to the issuance of the PSINet common stock, unless any PSINet common
stock is to be issued in a name other than that in which the certificate
surrendered has been registered. In such case, the person requesting the
issuance must pay to PSINet any transfer taxes payable by reason of the
transfer, or of any prior transfer of the surrendered certificate, or establish
to the satisfaction of PSINet that the taxes have been paid or are not payable.

Effective Time of the Merger

   The merger will become effective once the certificate of merger has been
filed with the Secretary of State for the State of Delaware and has become
effective in accordance with Delaware law.

Listing of PSINet Common Stock on The Nasdaq Stock Market

   It is a condition to the completion of the merger that PSINet common stock
issuable to Metamor stockholders in the merger and upon exercise of the assumed
Metamor options be approved for listing on The Nasdaq Stock Market, subject to
official notice of issuance.

Material United States Federal Income Tax Consequences of the Merger

   The following discussion is a summary description of the material U.S.
federal income tax consequences of the merger applicable to Metamor
stockholders. This discussion is for general information only and does not
purport to consider all aspects of U.S. federal income taxation that may be
relevant to a Metamor stockholder. This discussion is based upon the provisions
of the Internal Revenue Code, existing regulations, and administrative and
judicial interpretations of the Internal Revenue Code, all as in effect as of
the date hereof and all of which are subject to change (possibly with
retroactive effect). This discussion applies only to Metamor stockholders who
hold their Metamor shares as capital assets within the meaning of Section 1221
of the Internal Revenue Code and does not apply to the following:

  .  stockholders who received their Metamor shares pursuant to the exercise
     of employee stock options or similar securities or otherwise as
     compensation;

  .  stockholders who hold their Metamor shares as part of a "straddle,"
     "hedge," "conversion transaction," "synthetic security" or other
     integrated investment;


                                       62
<PAGE>

  .  stockholders (including, without limitation, financial institutions,
     insurance companies, tax-exempt organizations, dealers or traders in
     securities, and stockholders subject to the alternative minimum tax) who
     may be subject to special rules;

  .  stockholders whose functional currency is not the U.S. dollar; or

  .  stockholders who, for U.S. federal income tax purposes, are non-resident
     alien individuals, foreign corporations, foreign partnerships, or
     foreign estates or trusts.

   THIS DISCUSSION ALSO DOES NOT CONSIDER THE EFFECT OF ANY FOREIGN, STATE OR
LOCAL LAWS. ACCORDINGLY, YOU SHOULD CONSULT YOUR TAX ADVISOR TO DETERMINE THE
TAX EFFECT TO YOU OF THE MERGER, INCLUDING THE APPLICATION AND EFFECT OF
FOREIGN, STATE, LOCAL OR OTHER TAX LAWS.

   Tax Opinion and Merger. The consummation of the merger is contingent upon
the receipt by:

  .  PSINet of an opinion from its attorneys to the effect that the merger
     will be treated as a reorganization within the meaning of Section 368(a)
     of the Internal Revenue Code; provided, however, in the event that such
     counsel is unwilling to render such an opinion this condition shall be
     satisfied if such an opinion that is reasonably satisfactory to PSINet
     is rendered by attorneys for Metamor; and

  .  Metamor of an opinion from its attorneys to the effect that the merger
     will be treated as a reorganization within the meaning of Section 368(a)
     of the Internal Revenue Code; provided, however, in the event that such
     counsel is unwilling to render such an opinion this condition shall be
     satisfied if such an opinion that is reasonably satisfactory to Metamor
     is rendered by attorneys for PSINet.

   The opinions will be based upon certain customary assumptions and
representations of fact, including representations of fact contained in
certificates of officers of PSINet, Metamor and others. No ruling has been or
will be sought from the Internal Revenue Service as to the U.S. federal income
tax consequences of the merger, and the opinions of counsel are not binding
upon the Internal Revenue Service or any court. Accordingly, neither PSINet nor
Metamor can assure you that the Internal Revenue Service will not contest the
conclusions expressed in the opinions or that a court will not sustain such
contest.

   The following discussion of U.S. federal income tax consequences of the
merger to Metamor stockholders assumes that the merger will qualify as a
"reorganization" within the meaning of Section 368(a) of the Internal Revenue
Code, based on such opinions.

   Tax Impact from the Merger. Metamor stockholders will not recognize any gain
or loss as a result of the exchange of their shares of Metamor common stock for
PSINet common stock (except with respect to the receipt of cash in lieu of
fractional shares of PSINet, as discussed below). The aggregate adjusted tax
basis of PSINet shares received (including any fractional shares deemed
received) will equal the Metamor stockholder's aggregate adjusted tax basis in
the Metamor shares surrendered. The holding period of the PSINet shares
received pursuant to the merger will include the holding period of the Metamor
shares surrendered.

   Taxation of Cash Paid in Lieu of Fractional Shares. Metamor stockholders who
receive cash in lieu of a fractional PSINet share will be treated as having
first received such fractional PSINet share in the merger and then as having
received cash in exchange for the fractional share interest. Thus, each such
Metamor stockholder generally will recognize gain or loss in an amount equal to
the difference between the amount of cash received in lieu of the fractional
PSINet share and the portion of the basis in the Metamor shares allocable to
that fractional interest.

   Material Federal Income Tax Consequences to PSINet, Metamor and PSINet Shelf
IV Inc. None of PSINet, Metamor or PSINet Shelf IV Inc. will recognize gain or
loss as a result of the merger.

                                       63
<PAGE>

Accounting Treatment

   The acquisition of Metamor will be accounted for as a purchase business
combination and, accordingly, the purchase price of Metamor will be allocated
to tangible and intangible assets acquired and liabilities assumed, based upon
their respective fair values, with the excess allocated to goodwill to be
amortized over the estimated economic life of the goodwill. PSINet is
undertaking a study by an independent third party to determine the allocation
of the total purchase price of the merger to the various assets acquired,
including in-process research and development, and the liabilities assumed. Any
portion of the purchase price allocated to in-process research and development
will be recognized as a charge against income in PSINet's financial statements
for the period in which the merger closes. The results of operations of Metamor
will be included in PSINet's consolidated results of operations upon the
consummation of the merger.

Regulatory Matters

   United States Antitrust. Under the Hart-Scott-Rodino Act and related rules,
the merger may not be completed unless applicable waiting period requirements
have been satisfied. On April 10, 2000, PSINet and Metamor each filed a
Notification and Report Form with the Antitrust Division of the Department of
Justice and the Federal Trade Commission, and early termination of the waiting
period was granted on April 26, 2000. At any time before or after the effective
time of the merger, the Antitrust Division, the Federal Trade Commission or
others could take action under the antitrust laws, including seeking to prevent
the merger, to rescind the merger or to conditionally approve the merger upon
the divestiture of substantial assets of PSINet or Metamor. There can be no
assurance that a challenge to the merger on antitrust grounds will not be made
or, if such a challenge is made, that it would not be successful. Based upon
the advice of counsel, neither PSINet nor Metamor expect any conditions to be
imposed by either the Antitrust Division or the Federal Trade Commission.

   Other. Neither PSINet nor Metamor is aware of any other governmental filings
or consents that are required in connection with the merger. If any such
additional filings or consents are required, such filings or consents may delay
or prevent the closing of the merger or have other adverse consequences to
PSINet and/or Metamor.

Appraisal Rights

   Neither the shareholders of PSINet nor the stockholders of Metamor are
entitled to dissenters' rights of appraisal in connection with the merger under
New York law or Delaware law, respectively.

Continuation of Metamor Employee Benefits

   PSINet has agreed that, from the effective time of the merger until the
second anniversary of the effective time of the merger, it will provide, or
cause to be provided, benefit plans, programs and arrangements to employees of
Metamor that are no less favorable in the aggregate to those provided to
employees of Metamor immediately before the effective time of the merger.

   PSINet has agreed that, to the extent permitted under applicable benefit
plans or insurance policies:

  .  it will credit continuing employees of Metamor with their service with
     Metamor and its affiliates for purposes of participation, vesting and
     entitlement to benefits in any employee benefits plans, programs or
     arrangements in which they subsequently participate after the effective
     time of the merger;

  .  it will provide each Metamor employee with credit for any co-payments
     and deductibles paid before the effective time of the merger in
     satisfying any applicable deductible or out-of-pocket requirements; and


                                       64
<PAGE>

  .  it will not impose any limitations more onerous than those currently in
     effect as to pre-existing conditions, exclusions and waiting periods
     with respect to participation and coverage requirements applicable to
     Metamor employees.

Effect on Options Outstanding under Metamor Stock Plans

   Under the merger agreement, at the effective time of the merger, the
outstanding options to purchase Metamor common stock not previously exercised
will become exercisable for shares of PSINet common stock in accordance with
their existing terms. Each option to acquire shares of Metamor common stock
will be converted into an option to acquire PSINet common stock on the same
terms and conditions, except that:

  .  the number of shares of PSINet common stock subject to the option will
     be equal to the number of shares of Metamor common stock subject to the
     option multiplied by 0.9;

  .  the per share exercise price of the option will be the per share
     exercise price for the option prior to the merger divided by 0.9; and

  .  an aggregate of approximately 540,000 Metamor stock options will become
     fully vested as a result of the merger, including 85,200 options held by
     executive officers of Metamor.

   Metamor has agreed not to issue any additional stock options prior to the
effective time of the merger other than up to 300,000 options to new employees,
employees who have received promotions and members of Metamor's board of
directors at its annual meeting. The non-employee directors of Metamor are each
scheduled to receive 4,000 options at the time of Metamor's annual meeting on
May 18, 2000. These options will become fully vested as a result of the merger.

Resale of PSINet Common Stock

   PSINet common stock issued in the merger will not be subject to any
restrictions on transfer arising under the Securities Act of 1933, except for
shares issued to any Metamor stockholder who may be deemed to be an "affiliate"
of Metamor or PSINet for purposes of Rule 145 under the Securities Act. Under
Rule 145 each such affiliate may not transfer any PSINet common stock received
in the merger except in compliance with the resale provisions of Rule 144 or
145 under the Securities Act or as otherwise permitted under the Securities
Act.

Investment by PSINet in Xpedior

   PSINet and Xpedior have entered into a letter of intent relating to an
investment by PSINet of $50 million in Xpedior preferred stock simultaneously
with the closing of the merger. It is anticipated that the preferred stock to
be issued by Xpedior will bear annual dividends of 8 1/2% cumulative quarterly
and payable upon conversion or liquidation in stock (based upon the trailing
five day average closing bid price for Xpedior common stock) or cash at
Xpedior's option. In addition, it is anticipated that the Xpedior preferred
stock will be convertible into Xpedior common stock at $37.50 per share;
provided, the conversion price is expected to be reset after each of the first
three anniversaries of issuance, if, at the applicable anniversary date, the 30
trading day average closing bid price of Xpedior's common stock is below the
conversion price then in effect. If the conversion price is adjusted, the new
conversion price will be the 30 trading day average closing bid price prior to
the first two anniversaries and 95% of the 30 trading day average closing bid
price prior to the third anniversary date. It is also anticipated that Xpedior
will have the right to force the holders of the Xpedior preferred stock to
convert all of the preferred stock into Xpedior common stock at the conversion
price then in effect if the average current market price of Xpedior common
stock has exceeded 225% of the conversion price then in effect for at least 30
consecutive trading days and specified volumes of Xpedior common stock have
traded during that period. Moreover, it is anticipated that Xpedior will grant
registration rights in connection with the issuance of the preferred stock.

   This summary of the transaction with Xpedior is subject to the preparation,
negotiation and execution of definitive documentation, and is subject to change
in the course of that process. The investment by PSINet in the Xpedior
preferred stock is conditioned on the completion of the merger; however, the
investment is not a condition to the merger.

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                              THE MERGER AGREEMENT

   The following description summarizes the material provisions of the merger
agreement. You should read carefully the merger agreement, which is attached as
Annex 1 to this document.

Conditions to the Completion of the Merger

   Each party's obligation to effect the merger is subject to the satisfaction
or waiver of various conditions which include the following:

  .  PSINet's shareholders must approve the issuance of the shares of PSINet
     common stock at the PSINet special meeting;

  .  Metamor's stockholders must adopt the merger agreement at the Metamor
     special meeting;

  .  the waiting period required under applicable antitrust laws shall have
     expired or been terminated;

  .  Metamor's outstanding debt (including Metamor's 2.94% Convertible
     Subordinated Notes having a face amount of approximately $227 million
     and amounts due under Metamor's $80 million revolving credit facility of
     which $40.2 million was outstanding or committed as of April 25, 2000)
     must be paid or satisfied prior to the effectiveness of the merger, with
     funds to be provided by PSINet immediately prior to the closing;

  .  the PSINet common stock issuable to Metamor stockholders in the merger
     and pursuant to the assumed Metamor options must have been approved for
     listing on The Nasdaq Stock Market;

  .  no court with appropriate jurisdiction has issued an order, judgment,
     decree, injunction or ruling which restrains, enjoins or prohibits the
     completion of the merger;

  .  the registration statement of which this document forms a part must
     remain effective; and

  .  each of PSINet and Metamor must have received the tax opinions described
     above.

   In addition, each of PSINet's and Metamor's obligation to effect the merger
is subject to the satisfaction or waiver of the following additional
conditions:

  .  the representations and warranties of the other party set forth in the
     merger agreement shall be true and correct in all respects with
     specified materiality exceptions as though made on and as of the
     effective date of the merger;

  .  the other party to the merger agreement having performed or complied
     with all agreements and covenants required to be performed by it under
     the merger agreement on or prior to the date on which the merger is to
     be completed, in all material respects; and

  .  PSINet and Metamor having received from Nixon Peabody LLP and/or Vinson
     & Elkins L.L.P. the opinions stating that the merger will qualify for
     United States federal income tax purposes as a reorganization within the
     meaning of Section 368(a) of the Internal Revenue Code as described in
     "The Merger--Material United States Federal Income Tax Consequences of
     the Merger."

   PSINet and Metamor can provide no assurance that all of the conditions
precedent to the merger will be satisfied or waived by the party permitted to
do so. PSINet and Metamor cannot at this point determine whether either of them
would resolicit proxies in the event that it decides to waive any of the items
listed above. This decision would depend upon the facts and circumstances
leading to the decision to complete the merger and whether PSINet or Metamor,
as applicable, believes there has been a material change in the terms of the
merger and its effect on the PSINet shareholders or Metamor stockholders. In
making its determination, PSINet or Metamor would consider, among other
factors, the reasons for the waiver, the effect of the waiver on the terms of
the merger, whether the requirement being waived was necessary in order to make
the deal fair to its shareholders or stockholders from a financial point of
view, the availability of alternative transactions and, in the case of Metamor,
the prospects of Metamor as an independent entity. If either PSINet or Metamor

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<PAGE>

determines that a waiver of a condition would materially change the terms of
the merger, including the expected qualification of the merger as a
reorganization within the meaning of Section 368(a) of the Internal Revenue
Code, it would resolicit proxies.

No Solicitation of Alternate Transactions

   The merger agreement provides that Metamor will not, nor will its
subsidiaries, nor any of their directors, officers or employees, or any
investment banker, attorney, accountant or other representative retained by it
or any of its subsidiaries, directly or indirectly through another person:

  .  initiate, solicit, induce, encourage or knowingly facilitate, including
     by way of furnishing information, any inquiries or the making of any
     acquisition proposal, as defined below;

  .  participate in any discussions, provide any confidential information or
     data relating to, or engage in any negotiations regarding, any
     acquisition proposal or knowingly facilitate any effort or attempt to
     implement an acquisition proposal or accept an acquisition proposal;

provided, however, that if, at any time prior to the date of the special
meeting, Metamor's board of directors following consultation with its financial
advisors determines in good faith, that an unsolicited bona fide written
acquisition proposal could reasonably be expected to result in a superior
proposal, as defined below, Metamor may participate in negotiations or
discussions regarding such acquisition proposal and provide information to the
person or persons making the proposal after giving notice of the existence and
terms of any such proposal or proposals to PSINet at least one day before
commencing negotiations or discussions or providing information. Also, before
providing any information or data Metamor must receive a confidentiality
agreement containing restrictions comparable to those then in force between
PSINet and Metamor.

   The merger agreement provides that:

  .  the term "acquisition proposal" means any inquiry, proposal or offer
     from any person relating to a merger, reorganization, share exchange,
     consolidation, business combination, recapitalization, liquidation,
     dissolution or similar transaction involving Metamor, or any purchase or
     sale of all or any significant portion of the assets of Metamor or more
     than 10% of the Metamor common stock or the assets or capital sock of
     any of its subsidiaries; and

  .  the term "superior proposal" means any bona fide unsolicited written
     acquisition proposal made by a third party to acquire a majority of the
     voting power of the shares of Metamor common stock then outstanding or
     all or substantially all the assets of Metamor, for consideration
     consisting of cash and/or securities, that Metamor's board of directors
     concludes in good faith, after consultation with its financial advisors
     and legal counsel, taking into account all legal, financial, regulatory
     and other aspects of the proposal and the third party, would, if
     consummated, result in a transaction materially more favorable from a
     financial point of view to Metamor's stockholders than the merger and
     which is reasonably capable of being completed, including a conclusion
     that its financing, to the extent required, is then committed or is, in
     the good faith judgment of Metamor's board of directors, reasonably
     capable of being financed.

   Except as expressly permitted by the merger agreement, neither Metamor's
board of directors nor any committee of the board will:

  .  withdraw or modify, or propose publicly to withdraw or modify, in a
     manner adverse to PSINet, or take any action not explicitly permitted by
     the merger agreement that would be inconsistent with, the approval or
     recommendation by Metamor's board of directors or that committee of the
     merger;

  .  approve or recommend, or propose publicly to approve or recommend, any
     acquisition proposal; or

  .  cause Metamor to enter into any letter of intent, agreement in
     principle, acquisition agreement or other similar agreement related to
     any acquisition proposal.


                                       67
<PAGE>

Notwithstanding the foregoing, if prior to the special meeting, Metamor's
board of directors determines in good faith, after giving effect to all
concessions which may be offered by PSINet, that an acquisition proposal
constitutes a superior proposal which was not solicited by Metamor and which
did not otherwise result from a breach of the provisions of the merger
agreement described above, Metamor's board of directors may withdraw or modify
its approval or recommendation of the merger agreement, terminate the merger
agreement and enter into a letter of intent, agreement in principle,
acquisition agreement or other similar agreement related to an acquisition
proposal, but only at a time that is after the third day following PSINet's
receipt of written notice advising PSINet that Metamor's board of directors
has received a superior proposal and will no longer recommend the approval of
the merger. Metamor must pay a fee in the amount of $45 million to PSINet as a
condition to taking these actions. See "--Termination" and "--Termination
Fees."

Termination

   The merger agreement may be terminated at any time before the effective
time of the merger, whether before or after adoption of the merger agreement
by the stockholders of Metamor:

   1. by mutual written consent of PSINet and Metamor;

   2. by PSINet or Metamor, if the other party has materially breached the
merger agreement, which breach has not been cured and which would cause a
closing condition to be incapable of being satisfied by October 31, 2000;

   3. by PSINet or Metamor if any court of competent jurisdiction has issued,
enacted, entered, promulgated or enforced any order, judgment, decree,
injunction or ruling which, after reasonable efforts on the part of PSINet and
Metamor to resist, resolve or lift, permanently restrains, enjoins or
otherwise prohibits the merger and the order, judgment, decree, injunction or
ruling has become final and nonappealable;

   4. by PSINet or Metamor, if the merger has not been completed by October
31, 2000 provided that the terminating party's failure to perform any of its
material covenants or obligations under the merger agreement did not result in
the failure of the merger to occur on or before this date;

   5. by PSINet or Metamor, if the PSINet or Metamor special meeting
(including as they may be adjourned from time to time) concluded without
PSINet having obtained the shareholder approval to issue the PSINet common
stock in connection with the merger or Metamor having obtained the stockholder
approval of the merger agreement;

   6. by PSINet if, before the Metamor special meeting, Metamor's board of
directors: (a) withdraws or modifies in any adverse manner its approval of the
merger agreement, (b) approves or recommends a superior proposal, or (c)
resolves to take either of the foregoing actions; or

   7. by Metamor at any time before the Metamor special meeting, upon three
days' prior notice to PSINet, if Metamor's board of directors approves a
superior proposal; provided, that (a) Metamor has complied with its agreement
not to solicit acquisition proposals, (b) Metamor's board of directors has
concluded in good faith, after giving effect to all concessions which may be
offered by PSINet described in (c) below, on the basis of the advice of its
financial advisors and outside counsel, that the acquisition proposal is a
superior proposal and (c) before any termination, Metamor has negotiated, and
caused its financial and legal advisors to negotiate, with PSINet to make
adjustments in the terms and conditions of the merger agreement as would
enable PSINet to proceed with the merger, and (d) Metamor has paid the $45
million termination fee.

Termination Fees

   Termination Fee Payable by Metamor.  Metamor must pay PSINet a termination
fee of $45 million if:

   1. Metamor terminates the merger agreement in order to accept a more
favorable proposal or withdraws or modifies its approval or recommendation of
the merger in connection with the Metamor special meeting after receipt of a
more favorable proposal;


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<PAGE>

   2. PSINet terminates the merger agreement because Metamor's board of
directors approves or recommends a more favorable third party proposal;

   3. the merger agreement is terminated because holders of Metamor common
stock fail to adopt the merger agreement at the Metamor special meeting as it
may be adjourned from time to time, a third party acquisition proposal is
publicly disclosed prior to the completion of the Metamor special meeting, and
within 12 months after the termination Metamor enters into a definitive
agreement with any third party with respect to an acquisition proposal or an
acquisition proposal is consummated; or

   4. the merger agreement is terminated by PSINet based on a material breach
of the agreement by Metamor; by Metamor or PSINet if the closing of the merger
fails to occur by October 31, 2000; or by PSINet based on Metamor's withdrawal
or adverse modification of its recommendation of the merger agreement and, in
each case:

  .  there has been a third party acquisition proposal between the date of
     the merger agreement and the date of termination;

  .  following the existence of the acquisition proposal, prior to the
     termination, Metamor has intentionally breached in any material respect
     (and not cured) any of its material agreements under the merger
     agreement; and

  .  within 12 months of the termination Metamor enters into a definitive
     agreement relating to an acquisition proposal or an acquisition proposal
     is completed.

   Termination Fee Payable by PSINet. PSINet must pay Metamor a termination fee
of $45 million if:

   1. the PSINet shareholders have not approved the issuance of the PSINet
common stock at the PSINet special meeting as it may be adjourned from time to
time, and

   2. either

  .  prior to the PSINet special meeting, the board of directors of PSINet
     approved a bona fide written proposal or offer or entered into a
     definitive agreement with respect to the acquisition of PSINet or a
     majority interest in PSINet by another entity, or

  .  such a transaction is announced to the public at any time after the date
     of the merger agreement and prior to the PSINet special meeting and
     within 12 months following the final adjournment of the PSINet special
     meeting, PSINet enters into a definitive agreement with any third party
     with respect to the acquisition of PSINet or a majority interest in
     PSINet by any third party or such an acquisition by any third party is
     consummated.

Conduct of Business Pending the Merger

   Before the effective time of the merger, except as contemplated by the
merger agreement or unless PSINet otherwise agrees in writing, Metamor has
agreed that it will, and will cause its subsidiaries to, carry on their
respective businesses in the usual, regular and ordinary course in
substantially the same manner as conducted immediately before the signing of
the merger agreement and to use reasonable efforts to conduct their business in
a manner consistent with the budgets and plans made available to PSINet.
Metamor has agreed to, and to cause its subsidiaries to, use all reasonable
efforts to preserve intact their business organizations, keep available the
services of their employees and consultants, preserve their relationships and
goodwill with customers, suppliers, licensors, licensees, distributors and
others having business dealings with them, and to use commercially reasonable
efforts to protect their intellectual property to the end that their goodwill
and on-going businesses will not be impaired in any material respect at the
effective time of the merger. Metamor has also agreed that, unless PSINet
otherwise agrees in writing, before the effective time of the merger, it will
not and will not permit its subsidiaries to:


                                       69
<PAGE>

  .  declare, set aside, or pay any dividends on, or make any other
     distributions with respect to, any of its capital stock, other than
     dividends and distributions by any direct or indirect subsidiary of
     Metamor to its parent(s);

  .  split, combine or reclassify any of its capital stock or, other than
     pursuant to the exercise or conversion of Metamor stock options or other
     convertible securities outstanding on the date of the merger agreement,
     issue or authorize the issuance of any other securities with respect to,
     instead of or in substitution for shares of its capital stock;

  .  purchase, redeem or otherwise acquire, other than pursuant to the
     exercise or conversion of Metamor stock options or other convertible
     securities outstanding on the date of the merger agreement, any shares
     of Metamor capital stock or any of its subsidiaries or any other equity
     securities of Metamor or its subsidiaries or any rights, warrants, or
     options to acquire any of those shares or other securities other than
     purchases, redemptions or acquisitions of equity securities of wholly
     owned subsidiaries of Metamor or rights, warrants or options to acquire
     those securities;

  .  issue, deliver, sell, pledge, dispose of or otherwise encumber any
     shares of its capital stock including any Metamor stock options (other
     than up to 300,000 options agreed to previously by PSINet and options
     granted by Xpedior) or other convertible securities, any other voting
     securities of Metamor or any securities convertible into, or any rights,
     warrants or options to acquire, any of those shares or voting securities
     (other than the issuance of Metamor common stock upon the exercise of
     stock options outstanding on the date of the merger agreement) or amend
     the terms of any of those securities, rights, warrants or options or
     take action to accelerate the vesting thereof;

  .  grant, award or enter into any compensation or change of control
     arrangement with any employee;

  .  amend its certificate of incorporation or by-laws or comparable
     organizational documents of any of its subsidiaries;

  .  acquire or agree to acquire by merging or consolidating with, or by
     purchasing a substantial portion of the assets of, any business or any
     corporation, partnership, joint venture, association or other business
     organization or division, or any assets that are material, individually
     or in the aggregate, to Metamor and its subsidiaries, except in the
     ordinary course of business;

  .  subject to a lien or sell, lease or otherwise dispose of any of its
     material properties, assets or intellectual property rights, except in
     the ordinary course of business;

  .  incur or modify any indebtedness for borrowed money or guarantee any
     indebtedness of another person, issue or sell any debt securities of
     Metamor or any of its subsidiaries, guarantee any debt securities of
     another person (other than indebtedness to, guarantees of, or issuances
     or sales to Metamor or a wholly owned subsidiary of Metamor), or enter
     into any "keep well" or other agreement to maintain any financial
     condition of another person, except, in any case, for borrowings or
     other transactions incurred in the ordinary course of business under
     existing credit facilities, including to repay existing indebtedness
     pursuant to the terms of the indebtedness;

  .  except in the ordinary course of business, make any loans, advances or
     capital contributions to, or investments in, any other person, other
     than to Metamor or any direct or indirect subsidiary of Metamor or
     settle or compromise any material claims or litigation;

  .  take any action that would result in Metamor owning less than 80% of the
     outstanding Xpedior common stock;

  .  take any action or omit to take any action that would cause any of its
     representations and warranties in the merger agreement to become untrue
     in any material respect; or

  .  authorize any of, or commit or agree to take any of, the foregoing
     actions.


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   These limitations upon Metamor's conduct do not generally apply to these
transactions or actions if they are between Metamor and a wholly owned
subsidiary of Metamor or if they are between two wholly owned subsidiaries of
Metamor.

   Metamor has agreed to promptly provide PSINet copies of all filings made by
Metamor with any governmental entity in connection with the merger agreement
and the transactions contemplated by the agreement. Before settling or
compromising any material income tax liability of Metamor or any of its
subsidiaries, Metamor has agreed to obtain the consent of PSINet. Metamor has
also agreed to consult with PSINet and its advisors as to the positions and
elections that will be taken or made with respect to tax matters.

   PSINet covenants and agrees that between the date of the merger agreement
and the completion of the merger it will not:

  .  declare, set aside, or pay any dividends on, or make any other
     distributions in respect of, any of its PSINet common stock, except such
     dividends or distributions as would give rise to an adjustment to the
     exchange ratio pursuant to the merger agreement;

  .  enter into, or permit any of its subsidiaries to enter into, any written
     contract pursuant to which PSINet expressly agrees not to consummate the
     merger, which is otherwise conditioned upon the merger not occurring, or
     by its express terms would prohibit the merger; or

  .  take any action or omit to take any action that would cause any of its
     representations and warranties in the merger agreement to become untrue
     in any material respect.

Repayment of Metamor Debt; Convertible Notes

   Metamor and PSINet have agreed to cooperate to pay or satisfy at the
effective time of the merger the outstanding debt of Metamor and its
subsidiaries, with limited exceptions. This debt includes an aggregate of
approximately $40.2 million of borrowings or commitments under Metamor's
revolving credit facility, as of April 25, 2000, and approximately $227 million
face amount of convertible subordinated notes of Metamor. The parties expect
that the convertible notes will be called for redemption on August 18, 2000
(the earliest call date for the notes). The convertible notes are convertible
into Metamor common stock at an effective conversion price of $37.95 per share
(based on the applicable redemption price on the earliest redemption date). The
convertible notes will become convertible into PSINet common stock upon
consummation of the merger at an appropriately adjusted conversion rate. The
notes may be converted by the holders of the notes at any time prior to the
redemption date, and any notes not converted prior to the redemption date will
be redeemed for cash.

Amendment and Waiver

   Subject to applicable law:

  .  the merger agreement provides that it may be amended by the parties in
     writing at any time, except that after the approval of the shareholders
     of PSINet and the stockholders of Metamor has been obtained, no
     amendment may be entered into which would require further stockholder
     approval unless further approval is obtained; and

  .  at any time before the effective time of the merger, any party may
     extend the time for performance of the obligations of any other party to
     the merger agreement, waive inaccuracies in representations and
     warranties of any other party contained in the merger agreement or in
     any related document and waive compliance by any other party with any
     agreements or conditions in the merger agreement.

   Under Section 251(d) of the Delaware General Corporation Law, no amendment
to the merger agreement made after the adoption of the merger agreement by the
stockholders of Metamor may, without further stockholder approval, alter or
change the amount or kind of shares, securities, cash, property or rights to be
received by Metamor stockholders in the merger, or alter or change any terms
and conditions of the merger agreement if the alteration or change would
adversely affect the holders of any class or series of stock of Metamor.

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<PAGE>

Expenses

   Whether or not the merger is consummated, all costs and expenses incurred
in connection with the merger agreement and the transactions contemplated by
the agreement will be paid by the party incurring the fees or expenses, except
as otherwise provided in the merger agreement. If the merger agreement is
terminated, PSINet and Metamor will share equally the expenses incurred in
connection with filing and printing of this document and the filing fees for
the premerger notification and report forms under the Hart-Scott-Rodino Act
and other antitrust laws.

Representations and Warranties

   The merger agreement contains customary representations and warranties
relating to, among other things:

  .  corporate organization and similar corporate matters of PSINet and
     Metamor and their respective subsidiaries;

  .  the capital structure of each of PSINet and Metamor;

  .  authorization, execution, delivery, performance and enforceability of,
     and required consents, approvals, orders and authorizations of
     governmental authorities relating to, the merger agreement and related
     matters of PSINet and Metamor;

  .  documents filed by each of PSINet and Metamor with the Securities and
     Exchange Commission, the accuracy of information contained in those
     documents and the absence of undisclosed liabilities of each of PSINet
     and Metamor;

  .  the accuracy of information supplied by each of PSINet and Metamor in
     connection with this document and the registration statement of which it
     is a part;

  .  absence of certain material changes or events concerning PSINet and
     Metamor;

  .  compliance with applicable laws by Metamor;

  .  absence of changes in employee compensation and benefit plans of
     Metamor;

  .  matters relating to the Employee Retirement Income Security Act and
     other labor matters of Metamor;

  .  filing of tax returns and payment of taxes by Metamor and its
     subsidiaries;

  .  board approval and required stockholder vote of Metamor and PSINet to
     approve the merger and the issuance of the PSINet common stock in
     connection with the merger;

  .  engagement and payment of fees of brokers, investment bankers, finders
     and financial advisors by each of PSINet and Metamor;

  .  receipt of fairness opinion by Metamor from its financial advisor;

  .  intellectual property and year 2000 matters of Metamor;

  .  outstanding and pending material litigation of each of PSINet and
     Metamor;

  .  assets and contracts of Metamor and absence of restrictions on its
     business activities; and

  .  environmental and insurance matters of Metamor.

Amendments to the Metamor Certificate of Incorporation

   As of the effective time of the merger, the Metamor certificate of
incorporation will be restated to be substantially identical to PSINet Shelf
IV Inc.'s certificate of incorporation immediately prior to the merger. For a
summary of some current provisions of the Metamor certificate of incorporation
and the associated rights of Metamor stockholders, see "Comparison of Rights
of Holders of Common Stock of PSINet and Metamor."

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          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

   The following unaudited pro forma condensed combined balance sheet as of
December 31, 1999 and the unaudited pro forma condensed combined statement of
operations for the year ended December 31, 1999, which we refer to as the Pro
Forma Financial Information, present the pro forma effect of PSINet's
acquisitions of Metamor, Transaction Network Services, Inc. (TNI), certain
other acquisitions, capital raising activity of PSINet since January 1, 2000
and the exchange of PSINet common stock for a portion of its outstanding
Series C preferred stock described below.

   The objective of Pro Forma Financial Information is to provide investors
with information about the continuing impact of particular completed or
probable transactions by indicating how the transactions might have affected
historical financial statements had they occurred at an earlier date.

   Under the terms of the merger agreement with Metamor entered into on March
21, 2000, the aggregate consideration to be paid to Metamor stockholders
consists of approximately 31.2 million shares of PSINet's common stock (at a
conversion ratio of 0.9 shares of PSINet's common stock for each share of
Metamor's common stock outstanding), which represents an aggregate value of
approximately $1.35 billion, based upon an average price per share of PSINet's
common stock of $43.35 for the period from March 20, 2000 through March 24,
2000. PSINet will also assume options to acquire approximately 4.6 million
shares of Metamor common stock which, under the terms of the merger agreement,
will be exercisable into approximately 4.1 million shares of PSINet's common
stock and represent an aggregate fair value of approximately $142.5 million.
Additionally, PSINet will transfer funds to a trustee to be held in an escrow
account for the redemption of Metamor's 2.94% Convertible Subordinated Notes
having a face amount of approximately $227.0 million and will repay amounts
outstanding under Metamor's $80.0 million revolving credit facility ($40.2
million was outstanding as of April 25, 2000) immediately prior to the merger
as a condition to closing. Simultaneously with the merger, PSINet has agreed to
invest $50.0 million in 8 1/2% preferred stock of Xpedior, a majority owned
subsidiary of Metamor. The source of the cash for the repayment of the Metamor
outstanding debt and the investment in Xpedior will be cash on hand.

   On November 23, 1999, PSINet acquired TNI. PSINet paid shareholders of TNI
aggregate consideration of approximately $339.3 million in cash and
approximately 15.2 million shares of PSINet common stock, which represented an
aggregate value of approximately $347.7 million, based upon a price per share
of PSINet common stock of $22.859 at the time we entered the definitive
agreement with TNI. PSINet also assumed options to acquire approximately
463,000 shares of TNI common stock which, at the time we entered into the
definitive agreement, were exercisable into 926,000 shares of PSINet common
stock and represented an aggregate fair value of approximately $13.0 million.
PSINet also repaid outstanding principal and interest under TNI's revolving
credit facility in the amount of $52.1 million as a condition to closing. The
source of the cash consideration for the TNI merger and the cash for the
repayment of the TNI revolving credit facility obligation was cash on hand.

   In addition to the TNI merger, during the year ended December 31, 1999,
PSINet completed a total of 43 acquisitions for aggregate purchase prices and
related payments of approximately $247.0 million exclusive of assumed debt.

   In February 2000, PSINet completed an offering of 16.5 million shares of 7%
Series D cumulative convertible preferred stock ("Series D preferred stock")
for net proceeds of approximately $740.2 million after expenses (excluding
amounts paid by the purchasers of the Series D preferred stock into the deposit
account that is not an asset of PSINet).

   In February and March 2000, PSINet exchanged approximately 8.2 million newly
issued shares of its common stock for an aggregate of approximately 4.6 million
shares of its Series C preferred stock through individually negotiated
transactions with a limited number of holders of the Series C preferred stock.
Subsequent to the exchange, PSINet converted the exchanged Series C preferred
stock into approximately 7.4

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<PAGE>


million shares of PSINet common stock, which are held as treasury shares. In
connection with this transaction, PSINet will receive approximately $32.4
million of cash from the deposit account associated with the Series C preferred
stock.

   The following unaudited pro forma condensed combined balance sheet at
December 31, 1999 presents, on a pro forma basis, PSINet's condensed combined
financial position assuming each of the following had occurred on December 31,
1999:

  .  PSINet's acquisition of Metamor and the simultaneous investment in
     Xpedior and the transfer of funds for and the repayment of Metamor debt
     at closing;

  .  PSINet's February 2000 offering of its Series D preferred stock and the
     application of the net proceeds; and

  .  the exchange of PSINet's Series C preferred stock, the subsequent
     conversion of the Series C preferred stock into PSINet's common stock
     held as treasury shares and the receipt of cash from the deposit
     account.

   The following unaudited pro forma condensed combined statement of operations
for the year ended December 31, 1999 presents, on a pro forma basis, PSINet's
condensed combined results of operations assuming each of the following had
occurred on January 1, 1999:

  .  PSINet's acquisition of Metamor and the simultaneous investment in
     Xpedior and the transfer of funds for and the repayment of Metamor debt
     at closing;

  .  PSINet's acquisition of TNI;

  .  PSINet's acquisitions of Planete.net S.A.R.L., Satelnet S.A., Telelinx
     Ltd., Horizontes Internet Ltd., Wavis Equipamentos de Informatica Ltd.,
     Sao Paulo On-Line Ltda., Internet de Mexico S.A. de C.V., Datanet S.A.
     de C.V., The Internet Company, Caribbean Internet Service Corp., The
     Internet Access Company, Argentina On-Line S.A., CSO.net Telecom
     Services GmbH, Intercomputer, S.A. and Intercomputer Soft, S.A.,
     ABAFoRUM S.A., Netwing EDV-Dienstleistungs GmbH, Global Link, Netsystem
     S.A., Domain Acesso e Servicos Internet Ltda, Netline Communicaciones
     S.A., Sinfonet S.A., Vision Network Limited, Servnet Servicos de
     Informatica e Communicacao Ltda, Elender Informatikai, Infase
     Comunicaciones, S.L., Internet Network Technologies, Site Internet Ltda,
     TotalNet Inc, Terzomillennio S.L., Orbinet Telecommunications, Inc.,
     ZebraNet, Inc., SPIN GmbH, Zircon, Mlink Internet, Inc., Netup, Lyceum,
     Telalink Corporation, Transaction Network Services, Inc, Alpha dot net,
     Netgate, JoinNet, Correionet, Lynx, and Pacwan (Other Acquisitions)
     which were consummated during 1999;

  .  PSINet's February 2000 offering of its Series D preferred stock and the
     application of the net proceeds; and

  .  the exchange of PSINet's Series C preferred stock, the subsequent
     conversion of the Series C preferred stock into PSINet's common stock
     held as treasury shares and the receipt of cash from the deposit
     account.

   The acquisition of Metamor will be accounted for as a purchase business
combination and, accordingly, the purchase price of Metamor will be allocated
to tangible assets acquired and liabilities assumed, based upon their
respective fair values, with the excess allocated to intangible assets to be
amortized over the estimated economic lives of the intangible assets. PSINet
has undertaken a study by an independent third party to determine the
allocation of the total purchase price of PSINet's acquisition of Metamor.
Until the study is complete, PSINet is unable to determine the allocation of
the total purchase price of Metamor. For purposes of this Pro Forma Financial
Information, PSINet attributed the excess of the purchase price over the
acquired net tangible assets for Metamor of $1.5 billion to goodwill with a
twenty year estimated useful life. PSINet's management expects that a portion
of the purchase price will be allocated to nongoodwill intangibles. To the

                                       74
<PAGE>

extent that a portion of the purchase price of Metamor is allocated among other
intangible assets with a useful life shorter than twenty years, the adjustment
for amortization expense for the twelve months ended December 31, 1999 would be
higher. In addition, PSINet's management is in the process of assessing and
formulating its integration plans. PSINet's management does not know the exact
amount, if any, of restructuring and other costs to be included in purchase
accounting but does not expect them to be material.

   The acquisition of TNI was accounted for as a purchase business combination
and, accordingly, the purchase price of TNI has been allocated to tangible
assets acquired and liabilities assumed, based upon their respective fair
values, with the excess allocated to intangible assets to be amortized over the
estimated economic lives of the intangible assets. PSINet engaged an
independent third party to determine the allocation of the total purchase price
of its acquisition of TNI. The evaluation for TNI indicated there were the
following intangible assets present: existing technology, tradenames, customer
contracts and relationships, existing workforce and goodwill, with estimated
useful lives from three to 20 years, and approximately $84.0 million of
purchased in-process research and development which is included in PSINet's
historical consolidated retained deficit reflected in the unaudited pro forma
condensed combined balance sheet and PSINet's historical loss from continuing
operations available to common shareholders in the unaudited pro forma
condensed combined statement of operations.

   Each of the Other Acquisitions was paid for in cash and has been accounted
for as a purchase business combination and, accordingly, the purchase price has
been allocated to tangible assets acquired and liabilities assumed, based upon
their respective fair values, with the excess allocated to intangible assets to
be amortized over the estimated economic lives of the intangible assets from
the respective dates of acquisition.

   The Pro Forma Financial Information is not intended to be indicative of the
results which would actually have been obtained had the transactions described
above occurred on the dates indicated or the results which may be obtained in
the future. The pro forma adjustments are based upon available information and
assumptions that PSINet management believes to be reasonable under the
circumstances. The unaudited pro forma condensed combined statement of
operations does not give effect to any potential cost savings and synergies
that could result from the acquisitions included therein. The Pro Forma
Financial Information should be read in conjunction with PSINet's consolidated
financial statements and notes thereto and Metamor's consolidated financial
statements and notes thereto which are incorporated by reference in this
document.


                                       75
<PAGE>

                                  PSINET INC.

         UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

                      For the Year Ended December 31, 1999
       (In millions of U.S. dollars, except per share and share amounts)

<TABLE>
<CAPTION>
                                                                       Transaction
                                                                         Network
                                           Metamor         Metamor       Services
                          PSINet Inc.  Worldwide, Inc. Worldwide, Inc.     Inc.        Other
                          Consolidated  Consolidated     Adjustments   Consolidated Acquisitions
                          ------------ --------------- --------------- ------------ ------------
<S>                       <C>          <C>             <C>             <C>          <C>
Internet access
 revenue................    $ 554.7        $  --           $              $152.8       $51.3
Services revenue........        --          577.0                            --          --
                            -------        ------          ------         ------       -----
   Total revenue........      554.7         577.0                          152.8        51.3
Operating costs and
 expenses:
 Data communications
  and operations........      396.4           --                            98.3        28.7
 Cost of services
  revenue...............        --          341.0                            --          --
 Selling, general and
  administrative........      182.5         174.3                           27.8        18.6
 Depreciation and
  amortization..........      166.5          26.0            74.0 (a)       17.6         3.6
 Charge for acquired
  in-process R&D........       88.7           --                             --          --
                            -------        ------          ------         ------       -----
   Total operating costs
    and expenses........      834.1         541.3            74.0          143.7        50.9
                            -------        ------          ------         ------       -----
(Loss) income from
 operations.............     (279.4)         35.7           (74.0)           9.1         0.4
Interest expense........     (193.1)        (20.9)           20.9 (b)       (3.7)       (0.8)
Interest income.........       54.4           --                             1.4         0.2
Other income (expense),
 net....................       (0.9)          2.4                            --         (0.4)
                            -------        ------          ------         ------       -----
(Loss) income from
 continuing operations
 before income taxes....     (419.0)         17.2           (53.1)           6.8        (0.6)
Income tax benefit
 (expense)..............        2.8          (7.0)            5.0 (c)       (5.8)       (0.8)
                            -------        ------          ------         ------       -----
(Loss) income from
 continuing operations..     (416.2)         10.2           (48.1)           1.0        (1.4)
Return to preferred
 shareholders...........      (17.7)          --                             --          --
                            -------        ------          ------         ------       -----
(Loss) income from
 continuing operations
 available to common
 shareholders...........    $(433.9)       $ 10.2          $(48.1)        $  1.0       $(1.4)
                            =======        ======          ======         ======       =====
Basic and diluted loss
 per share from
 continuing
 operations(e)..........    $ (3.49)
                            =======
Shares used in computing
 basic and diluted loss
 per share from
 continuing operations
 (in thousands).........    124,386                        31,224
                            =======                        ======
</TABLE>


                                       76
<PAGE>

                                  PSINET INC.

         UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

                      For the Year Ended December 31, 1999
       (In millions of U.S. dollars, except per share and share amounts)

<TABLE>
<CAPTION>
                                                                         Pro
                                                         Adjustments    Forma
                                                         -----------   -------
<S>                                                      <C>           <C>
Internet access revenue................................    $           $ 758.8
Services revenue.......................................                  577.0
                                                           ------      -------
    Total revenue......................................                1,335.8
Operating costs and expenses:
  Data communications and operations...................                  523.4
  Cost of services revenue.............................                  341.0
  Selling, general and administrative..................                  403.2
  Depreciation and amortization........................      62.4 (a)    350.1
  Charge for acquired in-process R&D...................                   88.7
                                                           ------      -------
    Total operating costs and expenses.................      62.4      1,706.4
                                                           ------      -------
(Loss) income from operations..........................     (62.4)      (370.6)
Interest expense.......................................       1.4 (b)   (196.2)
Interest income........................................                   56.0
Other income (expense), net............................                    1.1
                                                           ------      -------
(Loss) income from continuing operations before income
 taxes.................................................     (61.0)      (509.7)
Income tax benefit (expense)...........................       5.8 (c)      --
(Loss) income from continuing operations...............     (55.2)      (509.7)
Return to preferred shareholders.......................     (38.1)(d)    (55.8)
                                                           ------      -------
(Loss) income from continuing operations available to
 common shareholders...................................    $(93.3)     $(565.5)
                                                           ======      =======
Basic and diluted loss per share from continuing opera-
 tions.................................................                $ (3.45)
                                                                       =======
Shares used in computing basic and diluted loss per
 share from continuing operations (in thousands).......     8,155      163,765
                                                           ======      =======
</TABLE>


                                       77
<PAGE>

                                  PSINET INC.

    NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

                      For the Year Ended December 31, 1999

   The pro forma adjustments outlined below present separate adjustments
related to the acquisition of Metamor and the adjustments related to the other
transactions reflected in the unaudited pro forma condensed combined statement
of operations.

   The purchase price of each acquisition has been allocated to tangible assets
acquired and liabilities assumed, based upon their respective fair values, with
the excess allocated to intangible assets to be amortized over the estimated
economic lives of the intangible assets of up to 20 years from the respective
dates of acquisition.

   PSINet has undertaken a study by an independent third party to determine the
allocation of the total purchase price of its acquisition of Metamor. Until the
study is complete, PSINet is unable to determine the allocation of the total
purchase price of Metamor. For purposes of this Pro Forma Financial
Information, PSINet has attributed the excess of the purchase price over the
acquired net tangible assets for Metamor of $1.5 billion to goodwill with an
estimated twenty year useful life. To the extent that a portion of the purchase
price of Metamor is allocated among other intangible assets with a useful life
shorter than twenty years, the adjustment for amortization expense for the
twelve months ended December 31, 1999 would be higher and PSINet would record a
deferred tax liability relating to nongoodwill intangibles.

   (a) Reflects the increase in amortization resulting from the allocation of
the purchase price to the acquired net tangible and intangible assets
(principally tradename, customer relationships, goodwill, assembled workforce
and existing technology relating to TNI and the other acquisitions and goodwill
relating to Metamor). The assigned lives of the acquired intangible assets
range from three to 20 years.

<TABLE>
<CAPTION>
                                                                   Amortization
                                                                   ------------
                                                                   (millions of
                                                                       U.S.
                                                                     dollars)
      <S>                                                          <C>
      Metamor merger..............................................    $(74.0)
                                                                      ======
      TNI merger..................................................    $(42.2)
      Other acquisitions..........................................     (20.2)
                                                                      ------
                                                                      $(62.4)
                                                                      ======

   (b) Reflects the following:

<CAPTION>
                                                                     Interest
                                                                   ------------
                                                                   (millions of
                                                                       U.S.
                                                                     dollars)
      <S>                                                          <C>
      Interest expense avoided through assumed repayment of the
       Metamor 2.94% Convertible Subordinated Notes and the
       Metamor credit facility as of January 1, 1999..............    $ 20.9
                                                                      ======
      Interest expense avoided through assumed repayment of the
       TNI revolving credit facility as of January 1, 1999........    $  1.8
      Other.......................................................      (0.4)
                                                                      ------
                                                                      $  1.4
                                                                      ======
</TABLE>

                                       78
<PAGE>

                                  PSINET INC.

   NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS--
                                  (Continued)

                      For the Year Ended December 31, 1999

   (c) Reversal of tax expense recorded by Metamor and TNI as a result of
availability of PSINet taxable losses for the periods presented to offset
Metamor and TNI taxable income.

   (d) Reflects the following:

<TABLE>
<CAPTION>
                                                             Return to Preferred
                                                                Shareholders
                                                             -------------------
                                                                (millions of
                                                                U.S. dollars)
      <S>                                                    <C>
      Dividends on the Series D preferred stock............        $(55.3)
      Dividends on the Series C preferred stock avoided
       through assumed exchange for common stock as of Jan-
       uary 1, 1999........................................          17.2
                                                                   ------
                                                                   $(38.1)
                                                                   ======
</TABLE>

   (e) Basic and diluted loss per share are computed using net loss available
to common shareholders divided by the weighted average number of shares of
PSINet's common stock that were outstanding during the period presented and
assumes that the issuance of approximately 31.2 million shares of PSINet's
common stock in connection with the acquisition of Metamor and the issuance of
approximately 8.2 million shares of PSINet's common stock in connection with
the Series C preferred stock exchange as if they had occurred on January 1,
1999. Because all common stock equivalents are antidilutive, basic and diluted
loss per share are the same for all periods presented.


                                       79
<PAGE>

                                  PSINET INC.

              UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

                            As of December 31, 1999
                         (In millions of U.S. dollars)

<TABLE>
<CAPTION>
                                           Metamor         Metamor
                          PSINet Inc.  Worldwide, Inc. Worldwide, Inc.     Other        Pro
                          Consolidated  Consolidated     Adjustments    Adjustments    Forma
                          ------------ --------------- ---------------  -----------   --------
<S>                       <C>          <C>             <C>              <C>           <C>
ASSETS
Current assets:
 Cash and cash
  equivalents...........    $  853.6       $ 92.6         $ (204.5)(e)    $  32.4 (g)
                                                                            740.2 (f) $1,514.3
 Restricted cash and
  short-term
  investments...........       154.1          --                                         154.1
 Short-term investments
  and marketable
  securities............       747.6          --                                         747.6
 Accounts receivable,
  net...................       103.6        178.1                                        281.7
 Prepaid expenses and
  other current assets..        83.5         27.9                                        111.4
                            --------       ------         --------        -------     --------
 Total current assets...     1,942.4        298.6           (204.5)         772.6      2,809.1
Property, plant and
 equipment, net.........     1,162.6         53.5                                      1,216.1
Goodwill and other
 intangibles, net.......     1,212.0        573.0           (573.0)(b)
                                                           1,480.4 (b)                 2,692.4
Other assets and
 deferred charges.......       175.3         46.7            204.5 (e)                   426.5
                            --------       ------         --------        -------     --------
 Total assets...........    $4,492.3       $971.8         $  907.4        $ 772.6     $7,144.1
                            ========       ======         ========        =======     ========
LIABILITIES AND
 SHAREHOLDERS' EQUITY
Current liabilities:
 Current portion of
  debt..................    $  115.0                                                  $  115.0
 Trade accounts
  payable...............       141.5       $ 12.2                                        153.7
 Accrued payroll and
  related expenses......        16.1         30.3                                         46.4
 Other accounts payable
  and accrued
  liabilities...........        85.3         68.0         $   22.3 (c)                   175.6
 Accrued interest
  payable...............        94.7          2.5                                         97.2
 Deferred revenue.......        29.5          1.9                                         31.4
                            --------       ------         --------        -------     --------
 Total current
  liabilities...........       482.1        114.9             22.3                       619.3
Long-term debt..........     3,185.2        209.2                                      3,394.4
Deferred income tax
 liabilities............        17.9         15.0            (15.0)(b)                    17.9
Other liabilities.......        84.1          1.0                                         85.1
Minority interest.......         --         173.5           (137.7)(b)                    35.8
                            --------       ------         --------        -------     --------
 Total liabilities......     3,769.3        513.6           (130.4)                    4,152.5
                            --------       ------         --------        -------     --------
Shareholders' equity:
 Convertible preferred
  stock, Series C.......       375.2          --                           (188.8)(g)    186.4
 Convertible preferred
  stock, Series D.......         --           --                            740.2 (f)    740.2
 Common stock...........         1.5          0.4             (0.4)(d)        0.1 (g)
                                                               0.3 (a)        0.1 (h)      2.0
Capital in excess of par
 value..................     1,194.8        308.1            137.7 (b)       (0.1)(h)
                                                            (445.8)(d)      222.8 (g)
                                                           1,495.7 (a)                 2,913.2
Accumulated (deficit)
 earnings...............      (861.5)       146.9           (146.9)(d)       (1.7)(g)   (863.2)
 Treasury stock.........        (2.0)         --                                          (2.0)
 Accumulated other
  comprehensive income..       125.4          2.8             (2.8)(d)                   125.4
 Bandwidth asset to be
  delivered under IXC
  agreement.............      (110.4)         --                                        (110.4)
                            --------       ------         --------        -------     --------
 Total shareholders'
  equity................       723.0        458.2          1,037.8          772.6      2,991.6
                            --------       ------         --------        -------     --------
 Total liabilities and
  shareholders' equity..    $4,492.3       $971.8         $  907.4        $ 772.6     $7,144.1
                            ========       ======         ========        =======     ========
</TABLE>


                                       80
<PAGE>

                                  PSINET INC.

         NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

                            As of December 31, 1999

   Reflects the acquisition of Metamor and other events as if they had occurred
on December 31, 1999, including:

     (a) the assumed issuance of approximately 31.2 million shares of PSINet
  common stock in connection with the Metamor acquisition (the shares of
  PSINet common stock assume a value of $43.35 per share, based on the
  average of the closing price of PSINet common stock on the Nasdaq National
  Market for the period from March 20, 2000 through March 24, 2000).

     (b) PSINet has undertaken a study by an independent third party to
  determine the allocation of the total purchase price of the acquisition of
  Metamor. Until the study is complete, PSINet is unable to determine the
  allocation of the total purchase price of Metamor. For purposes of this Pro
  Forma Financial Information, PSINet has attributed the excess of the
  purchase price over the acquired net tangible assets for Metamor of $1.5
  billion to goodwill with an estimated twenty year useful life. To the
  extent that a portion of the purchase price of Metamor is allocated among
  other intangible assets, PSINet would record a deferred tax liability
  related to the nongoodwill intangibles and additional goodwill.

     (c) the estimated closing costs and estimated purchase liabilities
  associated with the Metamor acquisition.

     (d) the elimination of the Metamor common stock, capital in excess of
  par value, retained earnings and accumulated other comprehensive income.

     (e) The placement of the funds into a restricted escrow account
  necessary to redeem the Metamor 2.94% Convertible Subordinated Notes on the
  first redemption date, August 18, 2000 at a redemption price of $901.02 for
  each $1,000 face value note.

     (f) the issuance of approximately 16.5 million shares of 7% Series D
  preferred stock in February 2000 and the application of the net proceeds
  therefrom.

     (g) the exchange of approximately 8.2 million newly issued shares of
  PSINet common stock for an aggregate of approximately 4.6 million shares of
  PSINet Series C preferred stock and the receipt of $32.4 million of cash
  from the deposit account. In connection with this exchange PSINet recorded
  $1.7 million as additional return to preferred shareholders which has been
  recorded as an increase in accumulated deficit.

     (h) the issuance of approximately 7.4 million shares of PSINet common
  stock upon conversion of approximately 4.6 million shares of its Series C
  preferred stock held in treasury shares after the above exchange.


                                       81
<PAGE>

                       PRO FORMA CAPITALIZATION OF PSINET

   The following table presents the pro forma cash, cash equivalents, short-
term investments and marketable securities, restricted cash and short-term
investments and capitalization of PSINet as of December 31, 1999 after giving
pro forma effect to:

  .  the merger, the transfer of $204.5 million to a restricted escrow
     account for the redemption of Metamor's indebtedness and the investment
     of $50 million in Xpedior;

  .  PSINet's February 2000 offering of 7% Series D cumulative convertible
     preferred stock for net proceeds of approximately $740.2 million
     (excluding amounts paid by the initial purchasers into a deposit
     account); and

  .  the exchange in February and March, 2000 of approximately 8.2 million
     newly issued shares of PSINet common stock for an aggregate of
     approximately 4.6 million shares of its Series C preferred stock, the
     receipt of $32.4 million of cash from the related deposit account and
     the conversion of the Series C preferred stock held in treasury into
     approximately 7.4 million shares of PSINet common stock.

   This table should be read in conjunction with PSINet's and Metamor's
consolidated financial statements incorporated by reference in this document
and the "Unaudited Pro Forma Condensed Combined Financial Information" included
in this document on page 73. See also "Where You Can Find More Information"
included in this document on page 104.

<TABLE>
<CAPTION>
                                                                   Pro Forma
                                                                 December 31,
                                                                     1999
                                                                ---------------
                                                                (in millions of
                                                                 U.S. dollars)
<S>                                                             <C>
Cash, cash equivalents, short-term investments and marketable
 securities....................................................    $2,261.9
                                                                   ========
Restricted cash and short-term investments.....................    $  154.1
                                                                   ========
Current portion of long-term debt..............................    $  115.0
                                                                   --------
Long-term debt:
  10.0% senior notes due 2005..................................       600.0
  10.5% senior notes due 2006 (Euro 150.0).....................       150.9
  10.5% senior notes due 2006..................................       600.0
  11.0% senior notes due 2009 (Euro 150.0).....................       150.9
  11.0% senior notes due 2009..................................     1,050.0
  11.5% senior notes due 2008 (plus unamortized premium of
   $2.7).......................................................       352.7
  Capital lease obligations at interest rates ranging from 2.7%
   to 17.3%....................................................       252.8
  Notes payable at interest rates ranging from 1.8% to 12.7%...       237.1
                                                                   --------
    Total long-term debt.......................................     3,394.4
                                                                   --------
Shareholders' equity:
  Preferred stock, $.01 par value; 30,000,000 shares autho-
   rized; 22,070,665 shares designated Preferred Stock, Series
   A, 1,000,000 shares designated; no shares issued and out-
   standing....................................................         --
  Convertible preferred stock, Series C, $50.00 stated value;
   4,570,665 shares designated,
   issued and outstanding......................................       186.4
  Convertible preferred stock, Series D, $50.00 stated value;
   16,500,000 shares designated, issued and outstanding........       740.2
  Common stock, $.01 par value; 500,000,000 shares authorized;
   193,597,514 shares issued...................................         2.0
  Capital in excess of par value...............................     2,913.2
  Accumulated deficit..........................................      (863.2)
  Treasury stock, 7,621,787 shares, at cost....................        (2.0)
  Accumulated other comprehensive income.......................       125.4
  Bandwidth asset to be delivered under IXC agreement..........      (110.4)
                                                                   --------
    Total shareholders' equity.................................     2,991.6
                                                                   --------
    Total capitalization.......................................    $6,501.0
                                                                   ========
</TABLE>


                                       82
<PAGE>

                      DESCRIPTION OF PSINET CAPITAL STOCK

   The following summary of PSINet's capital stock is subject in all respects
to applicable New York law, PSINet's certificate of incorporation, by-laws and
shareholder rights plan. This summary is qualified in its entirety by reference
to the provisions of PSINet's certificate of incorporation, by-laws and
shareholders rights plan. Copies of PSINet's certificate of incorporation, by-
laws and shareholders rights plan have been filed with the SEC.

   PSINet's authorized capital stock consists of 500 million shares of common
stock, par value $.01 per share, and 30 million shares of preferred stock, par
value $.01 per share. The board of directors of PSINet has authorized an
amendment to PSINet's certificate of incorporation that would increase the
number of authorized shares of capital stock of PSINet to 2.0 billion shares of
common stock and 60 million shares of preferred stock. The shareholders of
PSINet are scheduled to vote on the proposed certificate of amendment at the
PSINet annual meeting which is scheduled to be held on May 15, 2000.

Common Stock

   As of April 25, 2000, there were 157,329,642 shares of PSINet common stock
outstanding and 7,422,675 shares of PSINet common stock in the company's
treasury. In addition, a total of approximately 25,975,238 shares of common
stock were reserved for issuance in connection with outstanding stock options,
100,000 shares were reserved for issuance in connection with outstanding
warrants to purchase common stock and a total of 18,343,563 shares were
reserved for issuance under PSINet's stock option and employee stock purchase
plans. On February 11, 2000, PSINet effected a two-for-one split of its common
stock by the payment of a stock dividend to holders of record of its common
stock as of the close of business on January 28, 2000. All share and dollar
amounts in this document have been adjusted to reflect the impact of this stock
split.

   Holders of PSINet common stock are entitled to one vote for each share held
of record on all matters submitted to a vote of the shareholders. Holders of
PSINet common stock are not entitled to cumulative voting rights with respect
to the election of directors and, as a consequence, minority shareholders will
not be able to elect directors on the basis of their votes alone. Subject to
preferences that may be applicable to any shares of preferred stock issued in
the future, holders of common stock are entitled to receive ratably such
dividends as may be declared from time to time by PSINet's Board of Directors
out of funds legally available for payment. In the event of a liquidation,
dissolution or winding up of PSINet, holders of PSINet common stock are
entitled to share ratably in all of PSINet's assets remaining after payment of
liabilities and the liquidation preference of any then outstanding preferred
stock. Holders of common stock have no preemptive rights and no right to
convert their common stock into any other securities. There are no redemption
or sinking fund provisions applicable to PSINet common stock. All shares of
PSINet common stock to be outstanding upon completion of this offering will by
fully paid and non-assessable, subject to Section 630 of the New York Business
Corporation Law. Under Section 630 of the New York Business Corporation Law,
PSINet's ten largest shareholders may become personally liable for unpaid wages
and debts to PSINet's employees if PSINet's capital stock ceases to be listed
on a national securities exchange or regularly quoted in the over-the-counter
market.

Preferred Stock

   PSINet's board of directors has the authority to issue up to 30,000,000
shares of its preferred stock in one or more series and to fix the rights,
preferences, privileges and restrictions of such series, including dividend
rights, conversion rights, voting rights, terms of redemption, liquidation
preferences, sinking fund terms and the number of shares constituting any
series or the designation of such series, without any further vote or action by
shareholders. As of the date of this document, 1,000,000 shares of PSINet
preferred stock were designated as Series A Junior Participating Preferred
Stock, $.01 par value per share, in connection with PSINet's shareholder rights
plan, no shares of which have been issued; 4,570,665 shares of PSINet preferred
stock are designated as 6 3/4% Series C cumulative convertible preferred stock,
all of which are issued and outstanding; and 16,500,000

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shares of PSINet preferred stock are designated as 7% Series D cumulative
convertible preferred stock, all of which are issued and outstanding. PSINet's
board of directors may designate and authorize the issuance of a new series of
PSINet preferred stock with voting and other rights that could adversely affect
the voting power of holders of PSINet common stock and the likelihood that such
holders will receive dividend payments and payments upon PSINet's liquidation
and could have the effect of delaying, deferring or preventing a change in
control of PSINet.

   In November 1997, PSINet issued 600,000 shares of its 8% Series B
convertible preferred stock in a private placement for approximately $30.0
million. During the first quarter of 1999, all outstanding shares of the Series
B preferred stock, which accrued dividends at an annual rate of 8%, were
converted into an aggregate of 6,000,000 shares of PSINet common stock.
Effective upon this conversion, the formerly outstanding shares of Series B
preferred stock resumed the status of authorized and unissued shares of PSINet
preferred stock, undesignated as to series, and are available for future
issuance as described in the immediately preceding paragraph.

   In May 1999, PSINet issued 9,200,000 shares of its 6 3/4% Series C
cumulative convertible preferred stock in a public offering for net proceeds of
$358.1 million after underwriting discounts and commissions and other offering
expenses (excluding amounts paid by the purchasers of the Series C preferred
stock into the deposit account described below). Simultaneously with the
issuance of the Series C preferred stock, the purchasers of the Series C
preferred stock deposited funds into an account called the deposit account,
from which quarterly cash payments of $0.84375 per share will be made or which
may be used at PSINet's option to purchase shares of its common stock at 95% of
the then current market price of PSINet common stock for delivery to holders of
the Series C preferred stock in lieu of cash payments. The deposit account is
not an asset of PSINet. The funds placed in the deposit account by the
purchasers of the Series C preferred stock will, together with the earnings on
those funds, be sufficient to make payments, in cash or stock, through May 15,
2002. Holders of Series C preferred stock received quarterly payments from the
deposit account of approximately $7.8 million on each of August 15, 1999,
November 15, 1999 and February 15, 2000. Until the expiration of the deposit
account, PSINet will accrete a return to preferred shareholders each quarter
from the date of issuance at an annual rate of approximately 6 3/4% of the
liquidation preference per share. Such amount will be recorded as a deduction
from net income to determine net income available to common shareholders. Upon
the expiration of the deposit account, which is expected to occur on May 15,
2002, unless earlier terminated, the Series C preferred stock will begin to
accrue dividends at an annual rate of 6 3/4% of the liquidation preference
payable, at PSINet's option, in cash or in shares of its common stock at 95% of
the market price of its common stock on that date. Under specified
circumstances, PSINet can elect to terminate the deposit account prior to May
15, 2002, at which time the remaining funds in the deposit account would be
distributed to it and the Series C preferred stock would begin to accrue
dividends.

   In February and March 2000, PSINet exchanged 8,155,192 newly issued shares
of its common stock for an aggregate of 4,629,335 shares of the then
outstanding Series C preferred stock through individually negotiated
transactions with a limited number of holders of Series C preferred stock.
After the exchange, PSINet converted the exchanged Series C preferred stock
into 7,422,675 shares of its common stock, which are being held as treasury
shares. Upon the conversion, the formerly outstanding shares of Series C
preferred stock resumed the status of authorized and unissued shares of PSINet
preferred stock, undesignated as to series, that are available for future
issuance as described above. Approximately $34.2 million will be released to
PSINet from the deposit account because of the conversion. As a result of these
transactions, there are only 4,570,665 shares of Series C preferred stock
designated, issued and outstanding as of the date of this document.

   Each share of the Series C preferred stock will be convertible at any time
at the option of the holders into 1.6034 shares of PSINet common stock (after
giving effect to PSINet's common stock split), equal to an initial conversion
price of $31.18375 per share (after giving effect to PSINet's common stock
split), subject to adjustment. The shares of Series C preferred stock will be
entitled to a liquidation preference equal to $50 per share.


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   PSINet may redeem the Series C preferred stock at a redemption premium of
101.929% of the liquidation preference (plus accumulated and unpaid dividends,
if any) on or after November 15, 2000 and prior to May 15, 2002, if the trading
price for the Series C preferred stock equals or exceeds $124.74 per share for
a specified trading period. Additional payments will also be made from the
deposit account or by PSINet to the holders of the Series C preferred stock if
it redeems Series C preferred stock under the foregoing circumstances. Except
in the foregoing circumstances, PSINet may not redeem the Series C preferred
stock prior to May 15, 2002. Beginning on May 15, 2002, PSINet may redeem
shares of the Series C preferred stock at an initial redemption premium of
103.857% of the liquidation preference, declining to 100.00% on May 15, 2006
and thereafter, plus in each case all accumulated and unpaid dividends to the
redemption date. PSINet may effect any redemption, in whole or in part, at its
option, in cash or by delivery of fully paid and nonassessable shares of its
common stock or a combination thereof (subject to applicable law), by
delivering notice to the holders of the Series C preferred stock.

   Holders of Series C preferred stock have no voting rights, except:

  .  as required by law,

  .  if dividends payable on the Series C preferred stock are in arrears for
     six quarterly periods, the holders of Series C preferred stock voting
     separately as a class with shares of any other preferred stock or
     preference securities having similar voting rights, including the Series
     D preferred stock, will be entitled to elect two directors to PSINet's
     board of directors, and

  .  the affirmative vote or consent of the holders of at least 66 2/3% of
     the outstanding Series C preferred stock will be required to permit
     PSINet to issue any class or series of stock, or security convertible
     into stock or evidencing a right to purchase any shares of any class or
     series of stock ranking senior to the Series C preferred stock as to
     dividends, liquidation rights or voting rights, and for amendments to
     PSINet's charter that would adversely affect the rights of holders of
     Series C preferred stock.

   In the event of a "change of control" (as defined in the charter amendment
designating the Series C preferred stock), holders of Series C preferred stock
will, if the market value of PSINet common stock at such time is less than the
conversion price for the Series C preferred stock, have a one time option to
convert all of their shares of Series C preferred stock into shares of PSINet
common stock at a conversion price equal to the greater of the market value of
PSINet common stock as of the date of the change in control and $19.365 (after
giving effect to PSINet's common stock split). In lieu of issuing shares of
common stock upon conversion in the event of a change of control, PSINet may,
at its option, make a cash payment equal to the market value of the common
stock otherwise issuable.

   In February 2000, PSINet issued 16,500,000 shares of its 7% Series D
cumulative convertible preferred stock in a public offering for net proceeds of
$740.2 million after discounts, commissions and offering expenses and excluding
amounts paid by the purchasers of the Series D preferred stock into the deposit
account described below. Simultaneously with the issuance of the Series D
preferred stock, the purchasers of the Series D preferred stock deposited funds
into an account called the deposit account, from which quarterly cash payments
of $0.875 per share will be made or which may be used at PSINet's option to
purchase shares of its common stock at either 93% or 97% of the then current
market price of its common stock (depending on whether the registration
statement covering the shares is effective) for delivery to holders of the
Series D preferred stock in lieu of cash payments. The deposit account is not
an asset of PSINet. The funds placed in the deposit account by the purchasers
of the Series D preferred stock will, together with the earnings on those
funds, be sufficient to make payments, in cash or stock, through February 15,
2001. Holders of Series D preferred stock will receive quarterly payments from
the deposit account on each of February 15, May 15, August 15 and November 15
of each year, commencing May 15, 2000. Until the expiration of the deposit
account, PSINet will accrete a return to preferred shareholders each quarter
from the date of issuance at an annual rate of 7% of the liquidation preference
per share. Such amount will be recorded as a deduction from net income to
determine net income available to common shareholders. Upon the expiration of
the deposit

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<PAGE>

account, which is expected to occur on February 15, 2001, unless earlier
terminated, the Series D preferred stock will begin to accrue dividends at an
annual rate of 7% of the liquidation preference payable, at PSINet's option, in
cash or in shares of its common stock at either 93% or 97% of the then market
price of its common stock (depending on whether the registration statement
covering the shares is effective). Under specified circumstances, PSINet can
elect to terminate the deposit account prior to February 15, 2001, at which
time the remaining funds in the deposit account would be distributed to PSINet
and the Series D preferred stock would begin to accrue dividends.

   Each share of the Series D preferred stock will be convertible at any time
after February 15, 2000 at the option of the holders into 0.9352 shares of
PSINet common stock (after giving effect to PSINet's common stock split), equal
to a conversion price of $53.465 per share (after giving effect to PSINet's
common stock split), subject to adjustment upon the occurrence of specified
events. The shares of Series D preferred stock will be entitled to a
liquidation preference equal to $50 per share.

   PSINet may redeem the Series D preferred stock at a redemption premium of
105.50% of the liquidation preference (plus accumulated and unpaid dividends,
if any) on or after August 15, 2001, if the trading price for PSINet common
stock equals or exceeds $80.20 per share for a specified trading period. PSINet
will also make additional payments to the holders of the Series D preferred
stock if it redeems the Series D preferred stock under the foregoing
circumstances. Except in the foregoing circumstances, PSINet may not redeem the
Series D preferred stock prior to February 15, 2003. Beginning on February 15,
2003, PSINet may redeem shares of the Series D preferred stock at an initial
redemption premium of 104.00% of the liquidation preference, declining to
100.00% on February 15, 2007 and thereafter, plus in each case all accumulated
and unpaid dividends to the redemption date. PSINet may effect any redemption,
in whole or in part, at its option, in cash or by delivery of fully paid and
nonassessable shares of its common stock or a combination thereof (subject to
applicable law), by delivering notice to the holders of the Series D preferred
stock.

   Holders of Series D preferred stock have no voting rights, except:

  .  as required by law,

  .  if dividends payable on the Series D preferred stock are in arrears for
     six quarterly periods, the holders of Series D preferred stock voting
     separately as a class with shares of any other preferred stock or
     preference securities having similar voting rights, including the Series
     C preferred stock, will be entitled to elect two directors to PSINet's
     board of directors, and

  .  the affirmative vote or consent of the holders of at least 66 2/3% of
     the outstanding Series D preferred stock will be required to permit
     PSINet to issue any class or series of stock, or security convertible
     into stock or evidencing a right to purchase any shares of any class or
     series of stock ranking senior to the Series D preferred stock as to
     dividends, liquidation rights or voting rights, and for amendments to
     PSINet's charter that would adversely affect the rights of holders of
     Series D preferred stock.

   In the event of a "change of control" (as defined in the charter amendment
designating the Series D preferred stock), holders of Series D preferred stock
will, if the market value of PSINet common stock at such time is less than the
conversion price for the Series D preferred stock, have a one time option to
convert all of their shares of Series D preferred stock into shares of PSINet
common stock at a conversion price equal to the greater of the market value of
PSINet common stock as of the date of the change in control and $28.98 (after
giving effect to PSINet's common stock split). In lieu of issuing shares of
common stock upon conversion in the event of a change of control, PSINet may,
at its option, make a cash payment equal to the market value of the common
stock otherwise issuable.

Registration Rights

   Pursuant to a registration rights agreement among PSINet and the original
holders of approximately 43.4 million shares of common stock (after giving
effect to PSINet's common stock split), until September 30, 2006,

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the holders and their permitted transferees may make up to six demands of
PSINet to file a registration statement under the Securities Act which would
permit them to sell all or a portion of their common stock. Those holders may
also require PSINet from time to time prior to January 12, 2005 to register
their shares on Form S-3.

   In connection with acquisitions, PSINet granted registration rights with
respect to an aggregate of approximately 9.8 million shares of PSINet common
stock (after giving effect to PSINet's common stock split). Holders of
registrable shares may require PSINet on up to five occasions prior to
September 30, 2006 to register their shares on Form S-3, subject to specified
conditions and limitations. Certain of these holders are also entitled to
require it to effect Form S-3 registrations for them.

   PSINet granted registration rights to IXC Internet Services Inc. with
respect to the shares of its common stock acquired by IXC pursuant to an IRU
and Stock Purchase Agreement. These registration rights are substantially
similar to those described in the immediately preceding paragraph except that
IXC is entitled to notice and piggyback registration rights at any time. IXC
may make up to three separate demands to have PSINet file a registration
statement under the Securities Act with respect to an underwritten public
offering, and IXC is entitled to Form S-3 registrations form time to time. IXC
has made one demand for registration to date and in January 2000, PSINet
effected a registration of 6 million shares of PSINet common stock to satisfy
its obligations resulting from such demand of IXC.

   Subject to limitations, PSINet is required to bear all registration, legal
(for no more than one independent legal counsel for all selling holders of
registrable shares) and other expenses in connection with these registrations,
other than underwriting discounts and commissions, and must provide appropriate
indemnification. These registration rights rank ratably.

   PSINet has granted registration rights to the holders of its Series D
preferred stock. PSINet is in the process of preparing a registration statement
with regard to the resale of the Series D preferred stock and underlying common
stock.

   PSINet believes that, with the exception of William Schrader who is PSINet's
founder, Chairman and Chief Executive Officer, and IXC, the original holders of
the registration rights described above would be eligible to sell the shares of
PSINet common stock held by them in the public market pursuant to SEC Rule
144(k) and, consequently, could dispose of the shares without exercising their
registration rights.

New York Anti-Takeover Law, Certain Charter and By-law Provisions and Other
Anti-takeover Considerations

   PSINet is subject to the provisions of Section 912 of the New York Business
Corporation Law and will continue to be so subject if and for so long as it has
a class of securities registered under Section 12 of the Securities Exchange
Act of 1934, at least 25% of PSINet's total employees are employed primarily
within New York or at least 250 employees are so employed and at least 10% of
PSINet's voting stock is owned beneficially by residents of the State of New
York. Section 912 provides, with certain exceptions, which include transactions
with shareholders who became interested prior to the effective date of an
amendment to the New York corporation's certificate of incorporation providing
that the corporation would be subject to Section 912 if such corporation did
not then have a class of stock registered pursuant to Section 12 of the
Exchange Act, that a New York corporation may not engage in a "business
combination" (e.g., merger, consolidation, recapitalization or disposition of
stock) with any "interested shareholder" for a period of five years from the
date that such person first became an interested shareholder unless:

     (1) the transaction resulting in a person becoming an interested
  shareholder, or the business combination, was approved by the board of
  directors of the corporation prior to that person becoming an interested
  shareholder;

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     (2) the business combination is approved by the holders of a majority of
  the outstanding voting stock not beneficially owned by such interested
  shareholder; or

     (3) the business combination meets certain valuation requirements for
  the stock of the New York corporation.

   An "interested shareholder" is defined as any person that:

     (a) is the beneficial owner of 20% or more of the outstanding voting
  stock of a New York corporation; or

     (b) is an affiliate or associate of the corporation that at any time
  during the prior five years was the beneficial owner, directly or
  indirectly, of 20% or more of the then outstanding voting stock.

These provisions are likely to impose greater restrictions on an unaffiliated
shareholder than on the existing shareholders who will continue to own a
majority of PSINet's outstanding common stock after the merger.

   PSINet's certificate of incorporation and by-laws contain provisions
intended to enhance the likelihood of continuity and stability in the
composition of its board of directors and of the policies formulated by the
board of directors which may discourage a future unsolicited takeover of us.
These provisions could have the effect of discouraging some attempts to acquire
PSINet or remove incumbent management. This is true even if a majority of
PSINet's shareholders believe removal would be in their best interests.

   PSINet's certificate of incorporation or by-laws, as applicable, among other
things:

     (1) provide that the number of directors will be not fewer than three
  nor more than nine. The exact number of directors will be determined from
  time to time by resolution adopted by a majority of its board of directors;

     (2) provide for a classified board of directors consisting of two
  classes of directors having staggered terms of two years each, with each of
  the classes required to consist of at least three directors;

     (3) subject to any rights of holders of its preferred stock which may be
  granted by its board of directors in the future and except as otherwise
  provided by Section 706(d) of the New York Business Corporation Law,
  provide that directors may be removed only for cause;

     (4) subject to any rights of holders of its preferred stock which may be
  granted by its board of directors in the future, permit vacancies on the
  board of directors that may occur between annual meetings and any newly
  created seats to be filled only by the board of directors and not by the
  shareholders;

     (5) limit the right of shareholders to call special meetings of
  shareholders;

     (6) prohibit shareholders from proposing amendments to its certificate
  of incorporation;

     (7) require any shareholder who wished to bring any proposal before a
  meeting of its shareholders or to nominate a person to serve as a director
  to give written notice thereof and certain related information at least 60
  days prior to the date one year from the date of its immediately preceding
  annual meeting, if such proposal or nomination is to be submitted at an
  annual meeting, and within ten days of the giving of notice to its
  shareholders, if such proposal or nomination is to be submitted at a
  special meeting;

     (8) require the affirmative vote of at least two-thirds of its capital
  stock entitled to vote to amend certain provisions of its certificate of
  incorporation and to amend its by-laws; and

     (9) provide that its board of directors, without action by its
  shareholders, may issue and fix the rights and preferences of shares of its
  preferred stock.

   These provisions may have the effect of delaying, deferring or preventing a
change of control of PSINet without further action by its shareholders. These
provisions may also discourage bids for PSINet common stock at a premium over
market price and may adversely affect the market price of, and the voting and
other rights of the holders of, common stock.

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Shareholder Rights Plan

   Each outstanding share of PSINet common stock has attached to it one-half of
a preferred stock purchase right. The rights also attach to most future
issuances of common stock. Subject to exceptions, each right will entitle the
registered holder to buy one one-thousandth of a share of PSINet Series A
preferred stock at an exercise price of $275 per right, subject to adjustment.
The rights will generally become exercisable upon the occurrence of the earlier
of:

  .  an announcement that a person or group of affiliated or associated
     persons (each, an "acquiring person") has acquired beneficial ownership
     of 20.50% or more of PSINet's outstanding common stock (other than
     persons who acquire ownership pursuant to a tender offer or exchange
     offer which is for all outstanding shares of PSINet's common stock, or
     persons who acquire ownership directly from PSINet, William Schrader,
     PSINet's Chairman and Chief Executive Officer, or his or PSINet's
     affiliates so long as such persons beneficially own less than 50% of
     PSINet's outstanding common stock); or

  .  an announcement or commencement of an intention to make a tender offer
     or exchange offer the consummation of which would result in the
     beneficial ownership by a person or group of 20.50% or more of the
     outstanding shares of PSINet's common stock (the earlier of such dates
     being called the "distribution date").

In such event, each holder of a right, other than rights beneficially owned by
the acquiring person, will thereafter have the right, subject to exceptions, to
receive upon exercise thereof a number of shares (or portions of shares) of
Series A preferred stock or, at the discretion of PSINet's board of directors,
a number of additional shares of common stock as set forth in the rights plan.
The acquisition of shares of PSINet's common stock by IXC or its controlled
affiliates pursuant to the IRU and Stock Purchase Agreement between IXC and
PSINet, however, did not render it an acquiring person. In addition, Ralph J.
Swett, a former officer and director of IXC and its parent corporation will not
become an acquiring person solely by reason of the issuance or exercise of
options, if any, granted to him in his capacity as one of PSINet's directors.

   All rights expire on November 5, 2009, unless the rights are earlier
redeemed or exchanged by PSINet or expire earlier upon the consummation of
certain transactions. Shares of PSINet Series A preferred stock purchasable
upon exercise of the rights will not be redeemable. Each share of Series A
preferred stock will be entitled, when, as and if declared, to an aggregate
dividend of 1,000 times the dividend declared per share of PSINet common stock.
No dividend may be declared on the common stock without the concurrent
declaration of a dividend on the Series A preferred stock. In the event of
liquidation, holders of the Series A preferred stock will be entitled to a
minimum preferential liquidation payment of $1,000 per share, plus any accrued
but unpaid dividends, but will be entitled to an aggregate payment of 1,000
times the payment made per share of common stock; thereafter, holders of the
Series A preferred stock and the holders of common stock will share pari passu
per share in any of PSINet's remaining assets. Each share of PSINet Series A
preferred stock will have 1,000 votes, voting together with PSINet common
stock. Finally, in the event of any merger, consolidation or other transaction
in which shares of common stock are converted or exchanged, each share of
Series A preferred stock will be entitled to receive 1,000 times the amount
received per share of common stock.

   In the event that any person or group of affiliated or associated persons
becomes an acquiring person, each holder of a right, other than rights
beneficially owned by the acquiring person which will thereupon become void,
will thereafter have the right (the "flip-in right") to receive, upon exercise
of a right at the then current exercise price of the right, that number of one
one-thousandths of a share of Series A preferred stock or, in the discretion of
PSINet's board of directors, that number of shares of common stock or, in
certain circumstances, other of PSINet's securities, having a market value of
two times the exercise price of the right. The flip-in right provisions do not
apply to a merger or other business combination with a person who has acquired
shares of PSINet common stock pursuant to certain transactions approved by
PSINet's board of directors (each, a "permitted offer").

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   In the event that, after a person or group has become an acquiring person,
PSINet is acquired in a merger or other business combination transaction or 50%
or more of PSINet's consolidated assets or earning power are sold or
transferred, except pursuant to a permitted offer, proper provision will be
made so that each holder of a right, other than rights beneficially owned by an
acquiring person which will have become void, will thereafter have the right
(the "flip-over right") to receive, upon the exercise thereof at the then
current exercise price of the right, that number of shares of common stock of
the person with which PSINet has engaged in the foregoing transaction (or its
parent), which number of shares at the time of such transaction will have a
market value of two times the exercise price of the right. The holder of a
right will continue to have the flip-over right whether or not such holder
exercises or surrenders the flip-in right.

   At any time prior to the earlier to occur of a person becoming an acquiring
person or the expiration of the rights, and under other specified
circumstances, PSINet may redeem the rights at a redemption price of $.01 per
right. PSINet may, at its option, pay the redemption price in shares of its
common stock. After the date that a person becomes an acquiring person, PSINet
may redeem the then outstanding rights, at the redemption price, provided that
such redemption is in connection with a merger or other business combination
transaction or series of transactions involving PSINet in which all holders of
shares of common stock are treated alike.

   The rights have anti-takeover effects. The rights will cause substantial
dilution to a person or group that attempts to acquire PSINet without
conditioning the offer on the rights being redeemed, a substantial number of
rights being acquired, or the offer being deemed a permitted offer under the
rights plan. However, the rights should not interfere with any merger or other
business combination in connection with a permitted offer or that is approved
by PSINet because the rights are redeemable under specified circumstances.

Transfer Agent and Registrar

   First Chicago Trust Company, a division of EquiServe, is the transfer agent
and registrar for PSINet's common stock, Series C preferred stock and Series D
preferred stock. Its telephone number is (201) 222-4099.

                       COMPARISON OF RIGHTS OF HOLDERS OF
                       COMMON STOCK OF PSINET AND METAMOR

   PSINet is a business corporation incorporated in New York and the rights of
PSINet shareholders are currently governed by the New York Business Corporation
Law, PSINet's certificate of incorporation and PSINet's by-laws. Metamor is a
business corporation incorporated in Delaware and the rights of Metamor
stockholders are currently governed by the Delaware General Corporation Law,
Metamor's certificate of incorporation and Metamor's by-laws. Upon completion
of the merger, the rights of Metamor stockholders who become shareholders of
PSINet in the merger will be governed by the New York Business Corporation Law,
PSINet's certificate of incorporation and PSINet's by-laws.

   The following description summarizes the material differences which may
affect the rights of stockholders of PSINet and Metamor, but it is not a
complete statement of all the differences or a complete description of the
specific provisions referred to in it. The identification of specific
differences is not intended to indicate that other equally or more significant
differences do not exist. You should read carefully the relevant provisions of
the New York Business Corporation Law, the Delaware General Corporation Law,
PSINet's certificate of incorporation, PSINet's by-laws, Metamor's certificate
of incorporation and Metamor's by-laws.

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<PAGE>

               PSINet                                    Metamor

                            Authorized Capital Stock

   PSINet's authorized capital stock         Metamor's authorized capital
consists of 500 million shares of         stock consists of 100 million shares
common stock, par value $.01 per          of common stock, par value $.01 per
share, of which approximately             share, of which 34,700,992 were
164,752,317 shares were issued and        outstanding at the close of business
157,329,642 shares were outstanding       on April 25, 2000, 3 million shares
at the close of business on April         of Class B non-voting common stock,
25, 2000, and 30 million shares of        par value $.01 per share, none of
preferred stock, par value $.01 per       which were outstanding at the close
share, of which 22,070,665 shares         of business on April 25, 2000, and 5
have been designated and 21,070,665       million shares of preferred stock,
shares were outstanding at the close      par value $.01 per share, none of
of business on April 25, 2000.            which were outstanding at the close
                                          of business on April 25, 2000.

                                   Dividends

   Under the New York Business
Corporation Law, PSINet may declare          Under the Delaware General
and pay dividends or make other           Corporation Law, Metamor may make
distributions to its shareholders         distributions to its stockholders
(subject to the rights of preferred       (subject to the rights of the
shareholders) out of its surplus,         preferred stockholders) out of its
unless PSINet is insolvent at the         surplus, or in the event there is no
time, if PSINet would become              surplus, out of its net profits for
insolvent by doing so, or when doing      the fiscal year in which the
so would be contrary to any               dividend is declared and/or the
restrictions contained in its             preceding fiscal year. If Metamor's
certificate of incorporation. The         capital is diminished to an amount
net assets of PSINet remaining after      less than the aggregate amount of
a declaration or payment of               the capital represented by the
dividends must be at least as much        issued and outstanding stock of all
as its stated capital.                    classes having a preference upon the
                                          distribution of assets, however, no
                                          dividends may be paid until the
                                          deficiency in the amount of the
                                          capital represented by such stock is
                                          repaired.

                    Classification of the Board of Directors

   Under the New York Business
Corporation Law, a corporation's             Under the Delaware General
certificate of incorporation or a         Corporation Law, a corporation's
by-law adopted by its shareholders        certificate of incorporation or a
may provide that the directors be         by-law adopted by its stockholders
divided into two, three or four           may provide the directors be divided
classes. The PSINet certificate of        into three classes. The Metamor
incorporation and by-laws provide         certificate of incorporation
that the board of directors shall be      provides that the board of directors
comprised of two classes of at least      shall be comprised of three classes
three directors each. One class is        as nearly equal in number as
elected each year for a two-year          possible. One class is elected each
term.                                     year for a three-year term.

                                       91
<PAGE>

                         Size of the Board of Directors

   Under the New York Business              Under the Delaware General
Corporation Law, the number of           Corporation Law, the number of
directors constituting a                 directors constituting a
corporation's board may be fixed by      corporation's board may be fixed
its by-laws, by ation of its             by, or in the manner provided in,
shareholders or by action of its         its by-laws unless its certificate
board pursuant to a by-law adopted       of incorporation fixes the number
by the shareholders. Under the           of directors. Under the Metamor
PSINet certificate of incorporation      certificate of incorporation and
and by-laws, the board may fix the       by-laws, the board may fix the
number of directors, provided that       number of directors, provided that
such number must be no less than         such number must be no less than
three and no more than nine.             three and no morre than twelve.
PSINet's board of directors              Metamor's board of directors
currently consists of six                currently consists of eleven
directors.                               directors.

                   Removal of Directors; Filling of Vacancies

   Under the PSINet certificate of
incorporation and by-laws, except           Under the Delaware General
as otherwise provided by the New         Corporation Law, a director of a
York Business Corporation Law, a         corporation having a classified
director may be removed only for         board may only be removed for cause
cause and only at an annual or           unless the certificate of
special meeting of shareholders.         incorporation otherwise provides.
Any vacancies on PSINet's board of       Any vacancies of Metamor's board of
directors may be filled solely by        directors may be filled solely by
the affirmative vote of a majority       the affirmative vote of a majority
of the remaining directors.              of the remaining directors except
                                         as otherwise provided in its
                                         certificate of incorporation.
                                         Metamor's certificate of
                                         incorporation provides that any
                                         director may be removed from office
                                         during any term by the affirmative
                                         vote of the holders of shares
                                         constituting 66 2/3% of the voting
                                         power of the outstanding shares of
                                         stock entitled to vote on the
                                         election of directors.

                   Special Meetings of the Stockholders

   Under the New York Business              Under the Delaware General
Corporate Law special meetings of        Corporation Law, special meetings
shareholders may be called by the        of stockholders may be called by
board or by such person or persons       the board or by such person or
as are authorized by the                 persons as are authorized by the
certificate of incorporation or by-      certificate of incorporation or by-
laws. The only business that may be      laws. Under the Metamor by-laws,
conducted at a special meeting of        special meetings of stockholders
shareholders is that which is            may be called by the Board of
related to the purposes set forth        Directors, the Chairman, the Vice
in the notice of the meeting. Under      Chairman, the Chief Executive
the PSINet by-laws, special              Officer, the President or at the
meetings of shareholders may be          written request of holders owning
called by the Chairman, the              more than twenty-five percent of
President or at the written request      the shares of capital stock issued
of a majority of the board of            and outstanding and entitled to
directors. PSINet shareholders may       vote at any such meeting. Metamor
act without a meeting but only by        stockholders may act without a
unanimous written consent.               meeting, without prior stockholder
                                         notice and without a vote, upon the
                                         written consent of the number of
                                         stockholders having not less than
                                         the minimum number of votes
                                         necessary to authorize such action
                                         at a meeting at which all
                                         stockholders entitled to vote were
                                         present and voted; provided, the
                                         board of directors must have
                                         approved the action in advance.

                                       92
<PAGE>

                             Stockholder Proposals

   Under the PSINet certificate of
incorporation and by-laws, for a            Under the Metamor by-laws, for a
shareholder to bring a matter before     stockholder to bring a matter before
a meeting of shareholders, the           an annual meeting of stockholders,
Secretary of PSINet must receive         the Secretary of Metamor must
advance written notice of the            receive advance written notice of
shareholder's intent, containing         the stockholder's intent, containing
certain required information. With       certain required information, no
respect to a shareholder proposal to     more than fifty days before the
be submitted at an annual meeting,       annual meeting and no later than the
the Secretary must receive the           later of thirty days before the
notice no later than sixty days          meeting or ten days after notice or
before the anniversary of the            public disclosure of the date of the
preceding annual meeting. With           meeting is given to Metamor's
respect to a shareholder proposal to     stockholders.
be submitted at a special meeting,
the Secretary must receive the
notice no later than the tenth day
following the date on which notice
of such meeting is first given to
shareholders.

                   Indemnification of Officers and Directors

   The New York Business Corporation        The Delaware General Corporation
Law generally provides that a            Law generally provides that a
corporation may indemnify an officer     corporation may indemnify any person
or director made a party or              made a party or threatened to be
threatened to be made a party to a       amde a party to a legal proceeding
legal proceeding against judgements,     by reason of the fact that such
fines, amounts paid in settlement        person is or was an officer,
and reasonable expenses (including       director, employee or agent of the
attorney's fees) actually and            corporation against expenses
necessarily incurred in connection       (including attorney fees),
with the proceeding if:                  judgments, fines and amounts paid in
                                         settlement if: settlement if:
 .  he acted in good faith for a
    purpose he reasonably believed to      .  he acted in good faith and in a
    be in or not opposed to the best          manner he reasonably believed to
    interests of the corporation;             be in or not opposed to the best
                                              interests of the corporation;
 .  in the case of a criminal
    proceeding, he had no reasonable       .  in the case of a criminal
    cause to believe that his conduct         proceeding, he had no reasonable
    was unlawful; and                         cause to believe that his
                                              conduct was unlawful; and
 .  in the case of a suit by or in
    the right of the corporation, the      .  in the case of a suit by or in
    suit is not settled and he is not         the name of the corporation, he
    adjudged to be liable to the              is not adjudged to be liable to
    corporation, unless a proper              the corporation, unless the
    court determines that he is               Court of Chancery determines
    nonetheless entitled to                   that he is nonetheless entitled
    indemnification.                          to indemnification.

                                      93
<PAGE>

   The New York Business Corporation         Metamor's certicate of
Law also permits corporations to          incorporation and by-laws provide
indemnify corporate personnel other       for indemnification to the fullest
than officers and directors but           extent permitted by law for all
provides no specific criteria for         persons it is permitted to
such indemnification.                     indemnify. Futhermore, to the
                                          fullest extent permitted by law,
   PSINet's certifcate of                 such persons would not be liable to
incorporation and by-laws generally       Metamor for monetary damages for
provide for indemnification, as           breach of fiduciary duty as a
described above, of directors and         director. Under the Delaware General
officers, as well as others serving       Corporation law, such person may
at the request of PSINet, to the          also be entitled to other
extent not prohibitted by law, such       indemnification rights arising under
persons will not be liable to PSINet      any by-law, agreement or stockholder
except in the event of bad faith,         vote.
intentional misconduct a knowing
violation of law or a violation of
certain statutory provisions
relating to the payment of dividends
and the distribution of the assets
of the corporation. Under PSINet's
by-laws, a director, officer or
employee may also be entitled to
other indemnification rights,
including any arising under any
agreement with the corporation.

                   Amendment of Certificate of Incorporation

   The PSINet certificate of                 Under the Delaware General
incorporation generally may be            Corporation Law, unless otherwise
amended by a majority of the              specified in the certificate of
outstanding PSINet shares entitled        incorporation, an amendment to the
to vote thereon, but the provision        certificate of incorporation
relating to amendments to specified       requires the affirmative vote of a
by-laws may be amended only by two-       majority of the outstanding shares
thirds of the votes of the                entitled to vote thereon.
outstanding PSINet shares.                Furthermore, under the Delaware
Furthermore, under the New York           General Corporation Law, any
Business Corporation Law, any             amendment to the Metamor certificate
amendment to the PSINet certificate       of incorporation must also be
of incorporation must be authorized       authorized by its board of
by its board of directors.                directors.

                              Amendment of By-Laws

   The PSINet by-laws may be amended
by two-thirds of the outstanding             Under the Delaware General
PSINet shares entitled to vote in         Corporation Law, the stockholders
the election of directos or by a          may adopt, amend or repeal Metamor's
majority of the PSINet directors          by-laws. Under Metamor's certificate
present at a meeting of the board of      of incorporation and by-laws, a
directors. However, any by-law            majority of the board of directors
adopted by the board may be amended       can also adopt, amend or repeal its
or repealed by two-thirds of the          by-laws.
outstanding sharres at an annual or
special meeting.

                                       94
<PAGE>

                             Business Combinations

   Under the PSINet certificate of           Under the Delaware General
incorporation, a majority of the          Corporation Law, a majority of the
outstanding PSINet shares is needed       outstanding shares is needed to
to adopt a plan of merger or              adopt a plan of merger or
consolidation.                            consolidation.

   The New York Business Corporation
Law prohibits a New York corporation         The Delaware General Corporation
which has a class of voting stock         Law prohibits a Delaware corporation
which is registered with the SEC          which has a class of stock which is
from engaging in business                 listed on a national stock exchange
combinations with an interested           or which has 2,000 or more
shareholder (generally, the               stockholders of record from engaging
beneficial owner of 20% or more of        in a business combination with an
the corporation's voting stock) for       interested stockholder (generally,
five years following the time the         the beneficial owner of 15% or more
shareholder became an interested          of the corporation's outstanding
shareholder, unless, prior to that        voting stock) for three years
time, the corporation's board of          following the time the stockholder
directors approved either the             became an interested stockholder,
business combination or the               unless, prior to that time, the
transaction that resulted in the          corporation's board of directors
shareholder becoming an interested        approved either the business
shareholder. After five years, these      combination or the transaction that
business combinations may occur if        resulted in the stockholder becoming
approved by a majority vote of            an interested stockholder, or if
shares not owned by the interested        two-thirds of the outstanding shares
shareholder, or if certain fair           not owned by such interested
price requirements are met.               stockholder approve the business
                                          combination, or if, upon becoming an
                                          interested stockholder, such
                                          stockholder owned 85% of the
                                          outstanding shares (excluding those
                                          held by officers, directors and
                                          certain employee stock plans).

                                             Under Metamor's certificate of
                                          incorporation, Metamor is prohibited
                                          from engaging in business
                                          combinations with an interested
                                          stockholder (generally, the
                                          beneficial owner of 10% or more of
                                          Metamor's outstanding voting stock)
                                          unless (1) the holders of 66 2/3% of
                                          Metamor's outstanding voting stock,
                                          and (2) the holders of a majority of
                                          Metamor's outstanding shares of
                                          common stock other than the
                                          interested stockholder, voting
                                          separately as a class, have approved
                                          the business combination; except and
                                          unless (A) the business combination
                                          has been approved by more than two-
                                          thirds of Metamor's directors, or
                                          (B) certain fair price conditions
                                          with respect to the consideration to
                                          be paid by the interested
                                          stockholder and other prohibitions
                                          on the transaction with or
                                          benefiting the interested
                                          stockholder are met or complied
                                          with, in which case approval of the
                                          business combination will require
                                          only the affirmative vote of
                                          Metamor's stockholders holding a
                                          majority of Metamor's outstanding
                                          common stock.

                            Stockholder Rights Plan

   PSINet's shareholder rights plan          Metamor does not have a
is described in the preceding             stockholder rights plan.
section.

                                       95
<PAGE>


                   PSINET EMPLOYEE STOCK PURCHASE PLANS

The Purchase Plans

   The 1999 Employee Stock Purchase Plan and the 1999 International Employee
Stock Purchase Plan were adopted by the Board of Directors of PSINet in June
1999 to encourage employees of PSINet and its subsidiaries to acquire a
proprietary interest in PSINet by purchasing common stock through voluntary
payroll deductions. The U.S. Purchase Plan is designed as an "employee stock
purchase plan" within the meaning of Section 423(b) of the Internal Revenue
Code, and to qualify thereunder was approved by PSINet's shareholders on
September 28, 1999. The International Employee Stock Purchase Plan for non-U.S.
employees does not provide the same tax incentives due to differences in
applicable law. The Board believes the opportunity for employee equity
participation will enhance PSINet's ability to attract, and to promote the
retention and motivation of, employees. An aggregate of 2,115,000 shares of
PSINet's common stock have previously been reserved for issuance under the
Purchase Plans.

   On April 25, 2000, the PSINet Board of Directors amended the Purchase Plans,
subject to shareholder approval, to increase the number of shares of PSINet
common stock that may be issued under the Purchase Plans and to permit PSINet
to allow employees of acquired companies to begin participating in the Purchase
Plans at such times and on such terms as the committee administering the
Purchase Plans may determine. The amendments would increase the aggregate
number of shares that may be issued under the Purchase Plans from 2,115,000
shares to 4,115,000 shares. This increase is necessary to accommodate the
significant increase in the number of PSINet's employees as a result of the
Metamor merger. While outstanding options under Metamor's Employee Stock
Purchase Plan will effectively be converted into PSINet options under the terms
of the merger agreement, after the merger no new options will be granted under
the Metamor Employee Stock Purchase Plan and Metamor employees will be able to
participate in the Purchase Plans subject to the terms of the Purchase Plans.
The amendment to provide flexibility with respect to employees of acquired
companies is necessary to permit Metamor employees to begin participating in
the Purchase Plans prior to the commencement of a new offering period under the
Purchase Plans, subject to the discretion of the committee administering the
Purchase Plans.

Administration

   PSINet's Board of Directors has appointed a committee of PSINet executives
to serve as the plan administrators of the Purchase Plans. All questions of
interpretation or application of the Purchase Plans are determined by the
committee, whose decisions are final, conclusive and binding upon all
participants.

Eligibility and Participation

   Any person regularly employed by PSINet or a subsidiary of PSINet designated
by the committee for at least 20 hours per week is eligible to participate in
the applicable Purchase Plan. No person who owns or holds options or rights to
acquire, or as result of participation in the U.S. Purchase Plan would own or
hold options or rights to acquire, 5% or more of PSINet's common stock may
participate in the Purchase Plans. As of May 8, 2000, approximately 1,200 U.S.
employees were eligible to participate in the U.S. Purchase Plan. If the merger
is consummated, PSINet will have approximately 4,000 additional U.S. employees
who will be eligible to participate in the U.S. Purchase Plan. The
International Stock Purchase Plan covers certain of PSINet's non-U.S. employees
as determined from time to time by the committee depending on the number of
employees in a particular jurisdiction and the requirements of applicable local
law.

Offering Periods; Shares Issued Under Purchase Plans

   Each offering period is a six month period commencing on the first pay
period of the second calendar quarter and fourth calendar quarter of each year.
The first offering period under the U.S. Purchase Plan commenced in the fourth
quarter of 1999. During the last quarter of 1999 and the first quarter of 2000,
134,417 shares of PSINet common stock were issued under the Purchase Plans.

                                       96
<PAGE>


Purchase of Shares

   Eligible U.S. employees who wish to participate in the U.S. Purchase Plan
elect, at the beginning of an offering period, to allocate a portion of their
after-tax payroll to the U.S. Purchase Plan, which amount is deducted from the
employee's paycheck by PSINet and directed to the employee's accumulation
account. At the end of each offering period, all funds in the accumulation
account are used to purchase common stock. The Purchase Plan offering periods
are of six months' duration, one beginning on the first pay period of the
second quarter of the calendar year and one beginning on the first pay period
of the fourth quarter of the calendar year. The Internal Revenue Code imposes a
$25,000 market value limit per employee per calendar year on the combined value
of the common stock purchased through the Purchase Plan as calculated at the
beginning of each offering period. If an employee reaches this limit at any
purchase date, any remaining funds in the accumulation account will be retained
and applied to the next eligible purchase date.

   Eligible non-U.S. employees who wish to participate in the International
Purchase Plan may do so through payroll deduction or through payments to their
employer or PSINet as established under the International Purchase Plan or
requirements of applicable local law.

   PSINet may make a pro rata reduction in the number of shares purchasable if
such number exceeds the number of shares available for issuance under the
Purchase Plan. When an employee withdraws his or her participation in a
Purchase Plan by giving written notice to PSINet of his or her election to
withdraw, all accumulated payroll deductions will be returned to the employee,
if the employee makes the election no later than prior to the payroll period
preceding the next purchase date. Upon withdrawal, future payroll deductions
will cease. An employee's withdrawal from a Purchase Plan prior to the end of a
given offering period does not affect his or her eligibility to participate in
succeeding offering periods.

Purchase Price

   The purchase price per share at which shares of common stock are sold to
participating employees is 85% of the lower of the fair market value per share
of common stock on (1) the trading day immediately preceding the first business
day of the offering period or (2) the trading day immediately preceding the
last business day of the offering period. The fair market value of the common
stock on a given date is determined by reference to the closing price of the
common stock on The Nasdaq Stock Market.

Payroll Deductions for U.S. Employees

   The funds for purchasing shares for U.S. employees are accumulated by
payroll deductions, the rate of which may be increased or decreased by the
employee effective as of the commencement of the next offering period. Payroll
deductions do not accrue interest. An employee's participation in a Purchase
Plan, including the rate of payroll deductions, remains in effect for
successive offering periods unless the employee withdraws or amends such
participation or such employee's employment is terminated. An employee may
discontinue his or her payroll deductions and participation in the Purchase
Plans at any time.

Termination of Participation

   An employee's participation in a Purchase Plan is terminated when the
employee either voluntarily elects to withdraw his or her entire account, or
his or her employment is terminated. Once an employee's participation is
terminated, the employee is not entitled to again participate in a Purchase
Plan until the first day of the next offering period. Upon termination of
participation, the employee is entitled to receive the shares and any funds in
his or her individual account. Upon termination of an employee's employment,
amounts in that employee's accumulation account will be paid to the employee
and his or her participation in a Purchase Plan will cease.

                                       97
<PAGE>


Capital Changes

   In the event any change is made in PSINet's capitalization during an
offering period, such as a stock split, reverse stock split or stock dividend,
which results in an increase or decrease in the number of shares of common
stock outstanding without receipt of consideration by PSINet, appropriate
adjustments will be made in the purchase price and in the number of shares
purchasable under the Purchase Plans.

   The Purchase Plans will terminate automatically in the event of a
dissolution or liquidation of PSINet and any funds in the employees'
accumulation accounts will be refunded to employees without interest.

Amendment and Termination of the Purchase Plans

   The committee may amend the Purchase Plans at any time from time to time or
may terminate the Purchase Plans; however, no such action by the committee may
alter or impair any shares purchased or rights previously granted under the
Purchase Plans without the consent of the affected employees and no amendment
can be made without shareholder approval if shareholder approval is required by
the Internal Revenue Code or other applicable law.

U.S. Federal Income Tax Information

   No income will be taxable to an employee participating in the U.S. Purchase
Plan at the time of purchase of the shares of common stock at the formula
discount from fair market value. Upon disposition of the shares, the employee
will generally be subject to tax. If the employee was employed by PSINet for
the period up to three months prior to the disposition and if the shares have
been held by the employee for more than two years after the date of the
commencement of the offering period and more than one year after the purchase
date of the shares, the lesser of (i) the excess of the fair market value of
the shares at the time of such disposition over the purchase price, or (ii) 15%
of the fair market value of the shares on the first day of the offering period
will be taxable as ordinary income and any additional gain will be treated as
long-term capital gain. If the shares are disposed of before the expiration of
the holding periods described above, the excess of the fair market value of the
shares on the purchase date over the purchase price will be treated as ordinary
income and additional gain or loss on such disposition will be capital gain or
loss. Different rules may apply with respect to participating employees subject
to Section 16(b) of the Securities Exchange Act of 1934. PSINet is not entitled
to a deduction for amounts taxable to an employee except to the extent of the
ordinary income taxable to an employee upon disposition of shares prior to the
expiration of the holding periods described above.

   This is only a summary of the U.S. federal income tax consequences of the
U.S. Purchase Plan to employees and PSINet, and this summary does not purport
to be complete. Reference should be made to applicable provisions of the
Internal Revenue Code. In addition, this summary does not discuss the tax
consequences of an employee's death or the income tax laws of any municipality,
state or foreign country in which the employee may reside.

                                       98
<PAGE>


                       PSINET EXECUTIVE COMPENSATION

   Summary Compensation. The following table sets forth in summary form the
compensation paid by PSINet to its chief executive officer and to each of its
four most highly compensated executive officers other than the chief executive
officer as of December 31, 1999 for services rendered to PSINet and its
subsidiaries in all capacities.

                        Summary Compensation Table

<TABLE>
<CAPTION>
                                                                           Long-Term
                                                                          Compensation
                                          Annual Compensation                Awards
                              ------------------------------------------- ------------
                                                                           Securities
        Name and                                           Other Annual    Underlying       All Other
   Principal Position    Year Salary (1)($) Bonus (1)($) Compensation ($) Options (#)    Compensation ($)
- ------------------------ ---- ------------- ------------ ---------------- ------------   ----------------
<S>                      <C>  <C>           <C>          <C>              <C>            <C>
William L. Schrader..... 1999   $487,500      $262,500       $ 3,300(2)     100,000(3)        $1,150(4)
 Chairman and Chief      1998    314,519       200,000         5,905(2)         --             1,195(4)
 Executive Officer       1997    248,519       150,000         7,457(2)         --             3,135(4)
Harold S. Wills......... 1999   $468,750      $212,500       $ 5,155(5)     330,000(6)        $3,250(7)
 President and           1998    360,500       150,000         9,354(5)     450,000(6)         3,250(7)
 Chief Operating Officer 1997    252,654       100,000         9,929(5)     500,000(6)         3,125(7)
Chi H. Kwan (8)......... 1999   $371,716      $161,403       $   --          50,000(10)          --
 Senior Vice President   1998     97,820        40,350        29,346(9)     200,000(10)          --
 and President, PSINet
 Asia/Pacific
David N. Kunkel......... 1999   $350,000      $150,000       $ 5,835(11)    190,000(12)       $3,250(7)
 Vice Chairman and       1998    334,192       150,000         4,288(11)    400,000(12)        3,250(7)
 Executive Vice          1997    299,327       100,000         6,550(11)    200,000(12)        3,125(7)
 President
Edward D. Postal(13).... 1999   $286,250      $120,000       $ 5,792(14)    250,000(15)       $3,250(7)
 Executive Vice          1998    252,288       115,000         5,590(14)    400,000(15)        3,250(7)
 President and Chief     1997    204,077        75,000         6,880(14)    150,000(15)        3,125(7)
 Financial Officer
</TABLE>
- ----------------

 (1)  Amounts reported in respect of a particular fiscal year reflect amounts
      earned for services rendered in that fiscal year regardless of when paid.

 (2)  Consists of (i) $1,034 and $5,107 paid to Mr. Schrader with respect to
      installation of a security system at Mr. Schrader's home in 1998 and
      1997, respectively, (ii) a car allowance of $3,300, $3,290 and $2,350 in
      1999, 1998 and 1997, respectively, and (iii) a $1,581 taxable trip
      provided by PSINet to Mr. Schrader in 1998.

 (3)  Consists of 100,000 options issued under PSINet's Executive Stock
      Incentive Plan in 1999.

 (4)  Consists of: (i) matching contributions made to Mr. Schrader's account
      under PSINet's 401(k) Plan in the amounts of $1,150, $1,195 and 1,000 in
      1999, 1998 and 1997, respectively, and (ii) insurance premiums in the
      amount of $2,135 paid by PSINet in 1997 with respect to the proportionate
      beneficial interest of Mr. Schrader's spouse in an insurance policy on
      Mr. Schrader's life.

 (5)  Consists of (i) $473 and $6,051 paid to Mr. Wills for installation of a
      security system at his home in 1998 and 1997, respectively, (ii) car
      allowances of $2,396, $3,173 and $3,878 paid to Mr. Wills in 1999, 1998
      and 1997 respectively and (iii) taxable trips provided by PSINet to Mr.
      Wills in the amount of $2,759 in 1999 and $5,708 in 1998.

                       (footnotes continue on next page)

                                       99
<PAGE>

                    (footnotes continued from previous page)

 (6)  Consists of (i) 260,000 and 250,000 options issued under PSINet's
      Strategic Stock Incentive Plan in 1999 and 1998, respectively, (ii)
      70,000, 200,000 and 100,000 options issued under PSINet's Executive Stock
      Incentive Plan in 1999, 1998 and 1997, respectively, and (iii) 400,000
      options issued under PSINet's Executive Stock Option Plan in 1997.

 (7)  Consists of matching contributions made to the named officer's account
      under PSINet's 401(k) Plan in the years indicated.

 (8)  Mr. Kwan joined PSINet in September 1998. Accordingly, no information is
      provided for periods prior thereto with respect to Mr. Kwan. Compensation
      listed is based on an exchange rate of U.S.$0.0097820 = (Yen)1 at
      December 31, 1999.

 (9)  Represents a signing bonus paid to Mr. Kwan at the end of his first
      month.

(10)  Consists of (i) 50,000 options issued under PSINet's Strategic Stock
      Incentive Plan in 1999 and (ii) 200,000 options issued under PSINet's
      Executive Stock Incentive Plan in 1998.

(11)  Consists of (i) car allowances of $5,835, $4,288 and $3,544 paid to Mr.
      Kunkel in 1999, 1998 and 1997, respectively and (ii) payments made to Mr.
      Kunkel in connection with his relocation as follows: $830 for certain
      closing costs on the sale of his primary residence paid to Mr. Kunkel in
      1997 and $2,176 for certain carrying costs for his residence pending such
      sale paid to Mr. Kunkel in 1997.

(12)  Consists of (i) 190,000 and 200,000 options issued under PSINet's
      Strategic Stock Incentive Plan in 1999 and 1998, respectively, (ii)
      200,000 options issued under PSINet's Executive Stock Incentive Plan in
      1998 and (iii) 200,000 options issued pursuant to PSINet's Executive
      Stock Option Plan in 1997.

(13)  Mr. Postal ceased being an officer and employee of PSINet in February,
      2000.

(14)  Represents a car allowance to Mr. Postal.

(15)  Consists of (i) 50,000 and 200,000 options issued under PSINet's
      Strategic Stock Incentive Plan in 1999 and 1998, respectively, (ii)
      200,000, 200,000 and 72,100 options issued under PSINet's Executive Stock
      Incentive Plan in 1999, 1998 and 1997, respectively, and (iii) 77,900
      options issued under PSINet's Executive Stock Option Plan in 1997.

                                      100
<PAGE>


   Option Grants. The following table sets forth certain information, as of
December 31, 1999, concerning individual grants of stock options made during
the fiscal year ended December 31, 1999 to each of the persons named in the
Summary Compensation Table above.

                           Option Grants in 1999

<TABLE>
<CAPTION>
                                        Individual Grants
                         -----------------------------------------------
                                                                          Potential Realizable
                                    Percent of Total                     Value At Assumed Annual
                         Number of      Options                           Rates Of Stock Price
                         Securities     Granted      Exercise                 Appreciation
                         Underlying   To Employees   Or Base                 For Option Term
                          Options          in         Price   Expiration ------------------------
Name                     Granted(#)  Fiscal Year(1)   ($/sh)     Date      5% ($)      10% ($)
- ----                     ---------- ---------------- -------- ---------- ----------- ------------
<S>                      <C>        <C>              <C>      <C>        <C>         <C>
William L. Schrader..... 100,000(2)      0.85%       $17.3750  10/01/09  $ 1,092,704 $ 2,769,128
Harold S. Wills.........   4,678(3)      0.04%       $21.3750  04/01/09  $    62,885 $   159,362
                          55,322(3)      0.47%       $21.3750  04/01/09  $   743,673 $ 1,884,613
                         200,000(3)      1.70%       $24.3125  05/19/09  $ 3,058,000 $ 7,749,573
                          70,000(2)      0.60%       $17.3750  10/01/09  $   764,893 $ 1,938,389
Chi H. Kwan.............  50,000(3)      0.43%       $24.3125  05/19/09  $   764,500 $ 1,937,393
David N. Kunkel.........   3,334(3)      0.03%       $21.3750  04/01/09  $    44,818 $   113,577
                          36,666(3)      0.31%       $21.3750  04/01/09  $   492,887 $ 1,249,073
                           1,180(3)      0.01%       $24.3125  05/19/09  $    18,042 $    45,722
                         148,820(3)      1.27%       $24.3125  05/19/09  $ 2,275,458 $ 5,766,457
Edward D. Postal(4).....  45,834(3)      0.39%       $21.3750  04/01/09  $   616,129 $ 1,561,392
                           4,166(3)      0.04%       $21.3750  04/01/09  $    56,002 $   141,920
                             450(2)      0.01%       $24.3125  05/19/09  $     6,881 $    17,437
                         149,550(2)      1.27%       $24.3125  05/19/09  $ 2,286,620 $ 5,794,743
                          50,000(2)      0.43%       $17.3750  10/01/09  $   546,352 $ 1,384,564
</TABLE>
- ----------------

(1) Based upon total grants of options in respect of 11,770,071 shares of
    PSINet common stock made during 1999.

(2) Granted under PSINet's Executive Stock Incentive Plan. Vest monthly over 48
    months from the anniversary of the grant, subject to continued employment
    by PSINet on each of such dates.

(3) Granted under PSINet's Strategic Stock Incentive Plan. Vest monthly over 48
    months from the anniversary of the grant, subject to the continued
    employment by PSINet on each of such dates. Under each of PSINet's
    Executive Stock Incentive Plan, Executive Stock Option Plan, Directors
    Stock Incentive Plan and Strategic Stock Incentive Plan, upon the
    acquisition of beneficial ownership of 30% or more of PSINet's outstanding
    common stock by any person other than a wholly-owned subsidiary of PSINet
    or the occurrence of certain other change in control events with respect to
    PSINet specified in such plans, including certain mergers, consolidations
    and transfers of all or substantially all of PSINet's assets, all options
    and stock appreciation rights will become fully exercisable and all
    restricted stock awards will become immediately vested.

(4)  Mr. Postal ceased being an officer and employee of PSINet in February,
     2000.

                                      101
<PAGE>

   Aggregate Year-End Option Values. The following table provides information
concerning the number of unexercised options held by each of the individuals
named in the Summary Compensation Table as of December 31, 1999. Also reported
are the values for "in the money" options, which represent the positive spread
between the exercise price and the fair market value of PSINet's common stock
as of December 31, 1999.

     Aggregated Option Exercises in 1999 and Fiscal Year-End Option Values

<TABLE>
<CAPTION>
                                                      Number of Securities
                                                           Underlying            Value of Unexercised
                                                       Unexercised Options       In-the-Money Options
                             Shares                  At December 31, 1999(#)  at December 31, 1999($)(1)
                            Acquired       Value    ------------------------- ---------------------------
                         On Exercise(#) Realized($) Exercisable Unexercisable Exercisable  Unexercisable
Name                     -------------- ----------- ----------- ------------- ---------------------------
<S>                      <C>            <C>         <C>         <C>           <C>          <C>
William L. Schrader.....    854,000     $13,935,030     4,166       95,834    $      56,241 $   1,293,759
Harold S. Wills.........     96,968     $ 2,678,741   909,698      773,334    $  23,423,846 $  15,380,060
Chi H. Kwan.............        --              --     65,625      184,375    $   1,540,811 $   3,906,054
David N. Kunkel.........        --              --    835,094      457,292    $  21,522,735 $   8,991,613
Edward D. Postal(2).....        --              --    449,905      550,095    $  11,254,141 $  10,635,161
</TABLE>
- ----------------

(1)  Based upon a closing price of $30.875 on December 31, 1999, as reported on
     The Nasdaq Stock Market.

(2)  Mr. Postal ceased being an officer and employee of PSINet in February,
     2000.

   Employment Agreements. PSINet has employment agreements with each of Messrs.
Schrader, Wills, Kwan and Kunkel. PSINet also has employment agreements with
its executive officers pursuant to which they serve in their respective
capacities.

   Mr. Schrader's employment agreement provides for a four-year term ending
October 2003 and a current annual base salary of $750,000 with a minimum annual
increase of 5%. The agreement also provides for a performance bonus of $450,000
per annum or such greater amount as may be determined by PSINet's compensation
committee, subject to achievement of certain performance objectives established
by PSINet's compensation committee.

   Mr. Wills' employment agreement provides for a four-year term ending October
2003 and a current annual base salary of $600,000, with a minimum annual
increase of 5%. The agreement also provides for a performance bonus of $400,000
per annum, or such greater amount as may be determined by PSINet's compensation
committee, subject to achievement of certain performance objectives established
by PSINet's compensation committee.

   Mr. Kwan's employment agreement provides for a three-year term ending August
2001, and a current annual base salary of (Yen)40,000,000 per annum, and also
provides for a signing bonus of (Yen)3,000,000, a performance bonus of
(Yen)8,250,000 for the period ended March 1999 and an annual performance bonus
of (Yen)16,500,000, subject to achievement of certain performance objectives
established by PSINet's Chief Operating Officer.

   Mr. Kunkel's employment agreement provides for a four-year term ending
October 2002 and a current annual base salary of $350,000 and also provides for
a performance bonus of at least $150,000, subject to achievement of certain
performance objectives established by PSINet's Chairman.

   These employment agreements also provide for standard employee benefits,
including, without limitation, participation in PSINet's 401(k) plan and bonus
plan as well as life, health, accident and disability insurance. These
agreements also provide for a 24-month non-competition period. If PSINet elects
to enforce such non-competition restrictions, these officers are entitled, for
a period of 24 months after termination of their employment, to receive their
then current base salary and all benefits being provided to them at the time of

                                      102
<PAGE>

termination. Each of these employment agreements provides that options awarded
pursuant thereto are subject to immediate vesting upon the occurrence of
certain change in control events with respect to PSINet.


   Compensation of Directors of PSINet. Directors of PSINet other than those
who also are employees or consultants of PSINet or are serving on the board of
directors of PSINet as representatives of a shareholder, receive annual fees of
$15,000, with committee chairmen receiving an additional amount of $3,000 each
per year, and are eligible for awards under PSINet's Directors Stock Incentive
Plan (Directors' Plan). The Directors' Plan provides for initial option grants
with respect to 10,000 shares of PSINet common stock to be made to each
eligible director upon his or her first election to PSINet's board of directors
and, thereafter, for annual grants of options to purchase 5,000 shares of
common stock to be made to each eligible director who has served on PSINet's
board of directors for at least 12 months. Options are exercisable for 10 years
after the date of grant. The exercise price for any option under the plan is
equal to the fair market value of the common stock at the time such option is
granted. The initial option grants vest quarterly over a four-year period, and
the annual option grants vest annually over a two-year period. Each of Messrs.
Sharp and Swett received initial grants upon their election to PSINet's board
of directors in accordance with the Directors' Plan. In addition, directors who
are not also officers of PSINet receive fees of $1,000 per day for board and
committee meetings, $200 per day for board and committee conference calls and
$1,250 per day for services provided as a director at PSINet and committee
conference calls and $1,250 per day for services provided as a director at
PSINet pursuant to board or committee request. Committee chairmen receive an
additional $250 for each committee meeting attended and $50 for each committee
conference call attended. Directors are also reimbursed for certain reasonable
expenses incurred in attending board or committee meetings.


   Compensation Committee Interlocks and Insider Participation. During the year
ended December 31, 1999, the members of PSINet's compensation committee
consisted of Messrs. Baumer, Schrader and Swett. Mr. Schrader is the Chairman
of PSINet's board of directors and Chief Executive Officer of PSINet. None of
such persons other than Mr. Schrader is an executive officer or employee of
PSINet.

                                 LEGAL MATTERS

   The legality of PSINet common stock offered by this document and certain
United States federal income tax consequences of the merger will be passed upon
for PSINet by Nixon Peabody LLP, New York, New York, counsel for PSINet.
Certain attorneys with Nixon Peabody LLP currently own in the aggregate less
than one percent of PSINet's common stock.


   Certain United States federal income tax consequences of the merger will be
passed upon for Metamor by its counsel, Vinson & Elkins L.L.P., Houston, Texas.
Certain attorneys with Vinson & Elkins L.L.P. currently own in the aggregate
less than one percent of Metamor's common stock.

                                    EXPERTS


   The consolidated financial statements of PSINet Inc. incorporated in this
document by reference to PSINet Inc.'s Annual Report on Form 10-K for the year
ended December 31, 1999, have been so incorporated in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.

   The consolidated financial statements of Metamor Worldwide, Inc. appearing
in Metamor Worldwide, Inc.'s Annual Report (Form 10-K) for the year ended
December 31, 1999, have been audited by Ernst & Young LLP, independent
auditors, as set forth in their report thereon included therein and
incorporated herein by reference. Such consolidated financial statements are
incorporated herein by reference in reliance upon such report given on the
authority of such firm as experts in auditing and accounting.


                                      103
<PAGE>

                                 OTHER MATTERS

   As of the date of this document, the PSINet and Metamor boards of directors
know of no matters that will be presented for consideration at either special
meeting other than as described in this document.

                      WHERE YOU CAN FIND MORE INFORMATION

   PSINet and Metamor file annual, quarterly and special reports, proxy
statements and other information with the Securities and Exchange Commission.
You may read and copy any reports, statements or other information that PSINet
and Metamor file with the Securities and Exchange Commission at the Securities
and Exchange Commission's public reference rooms at the following locations:

     Public Reference Room                   New York Regional Office
     450 Fifth Street, N.W.                  7 World Trade Center
     Room 1024                               Suite 1300
     Washington, D.C. 20549                  New York, NY 10048

   Please call the Securities and Exchange Commission at 1-800-SEC-0330 for
further information on the public reference rooms. These Securities and
Exchange Commission filings are also available to the public from commercial
document retrieval services and at the Internet world wide web site maintained
by the Securities and Exchange Commission at "http://www.sec.gov." Reports,
proxy statements and other information pertaining to PSINet and Metamor are
also available for inspection at the offices of The Nasdaq Stock Market, which
is located at 1735 K Street, N.W., Washington, D.C. 20006.

   PSINet filed a registration statement on Form S-4 on April 14, 2000 to
register with the Securities and Exchange Commission the PSINet common stock to
be issued to Metamor stockholders in the merger and filed Amendment No. 1 to
such registration statement on Form S-4 on May 12, 2000. This document is a
part of that registration statement, as amended, and constitutes a prospectus
of PSINet in addition to being a proxy statement of PSINet and Metamor. As
allowed by Securities and Exchange Commission rules, this document does not
contain all the information you can find in PSINet's registration statement or
the exhibits to the registration statement.

   The Securities and Exchange Commission allows PSINet and Metamor to
"incorporate by reference" information into this document, which means that the
companies can disclose important information to you by referring you to other
documents filed separately with the Securities and Exchange Commission. The
information incorporated by reference is considered part of this document,
except for any information superseded by information contained directly in this
document or in later filed documents incorporated by reference in this
document.

   This document incorporates by reference the documents set forth below that
PSINet and Metamor have previously filed with the Securities and Exchange
Commission. These documents contain important business and financial
information about PSINet and Metamor that is not included in or delivered with
this document.

   PSINet has supplied all of the information contained or incorporated by
reference in this document relating to PSINet and Metamor has supplied all of
the information relating to Metamor.

   Metamor stockholders should not send in their Metamor certificates until
they receive the transmittal materials from the paying agent. Metamor
stockholders of record who have further questions about their share
certificates or the exchange of their Metamor common stock for PSINet common
stock in the merger should call the paying agent.

   We may already have sent you some of the documents incorporated by
reference, but you can obtain any of them through the companies, the Securities
and Exchange Commission or the Securities and Exchange

                                      104
<PAGE>

Commission's Internet web site as described above. Documents incorporated by
reference are available from the companies without charge, excluding all
exhibits, except that if the companies have specifically incorporated by
reference an exhibit in this document, the exhibit will also be provided
without charge. Stockholders may obtain documents incorporated by reference in
this document by requesting them in writing or by telephone from the
appropriate company at the following addresses:

             PSINet Inc.                       Metamor Worldwide, Inc.
                                          4400 Post Oak Parkway, Suite 1100
       44983 Knoll Square
                                                Houston, Texas 77027
     Ashburn, Virginia 20147
    Attention: Investor Relations           Attention: Investor Relations
                                              Telephone: (713) 548-3488
    Telephone: (703) 726-1577
                                              Facsimile: (713) 963-9711
    Facsimile: (703) 726-4261

  email: [email protected]       email: [email protected]

   You should rely only on the information contained or incorporated by
reference in this document. We have not authorized anyone to provide you with
information that is different from what is contained in this document. This
document is dated May 12, 2000. You should not assume that the information
contained in this document is accurate as of any date other than that date.
Neither the mailing of this document nor the issuance of PSINet common stock
in the merger creates any implication to the contrary.

                      DOCUMENTS INCORPORATED BY REFERENCE

PSINet

   PSINet is incorporating by reference in this document the following
documents which have been filed with the Securities and Exchange Commission:

     1. Annual report on Form 10-K for the fiscal year ended December 31,
  1999. This report contains:

      .  audited consolidated balance sheets for PSINet and its
         subsidiaries as of December 31, 1999 and 1998

      .  audited consolidated statements of operations, of changes in
         shareholders' equity and of cash flows for the years ended
         December 31, 1999, 1998 and 1997

     2. Current reports on Form 8-K dated:

      .  January 10, 2000

      .  January 18, 2000

      .  January 26, 2000

      .  January 28, 2000

      .  February 9, 2000

      .  February 11, 2000

      .  March 22, 2000

     3. Registration statement on Form 8-A dated April 7, 1995, as amended
  (registration no. 0-25812).

     4. Registration statement on Form 8-A dated June 4, 1996, as amended
  (registration no. 0-25812).

Metamor

   Metamor is incorporating by reference in this document the following
documents which have been filed with the Securities and Exchange Commission:


                                      105
<PAGE>

     1. Annual report on Form 10-K for the fiscal year ended December 31,
  1999. This report contains:

      .  audited consolidated balance sheets for Metamor and its
         subsidiaries as of December 31, 1999 and 1998

      .  related consolidated statements of operations, stockholders'
         equity and cash flows for each of the three years in the period
         ended December 31, 1999

     2. Current reports on Form 8-K dated:

      .  March 28, 2000

     3. Registration statement on Form 8-A dated October 20, 1995
  (registration no. 0-26970).

Subsequent Filings

   PSINet and Metamor also incorporate by reference additional documents that
may be filed with the Securities and Exchange Commission under Section 13(a),
13(c), 14 or 15(d) of the Exchange Act between the date of this document and
the date of the special meetings. These include periodic reports, such as
Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current
Reports on Form 8-K, as well as proxy statements.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

   This document contains certain forward-looking statements within the
meaning of the Private Securities Litigation Reform Act of 1995 with respect
to the financial condition, results of operations, business strategies,
operating efficiencies or synergies, competitive positions, growth
opportunities for existing products, plans and objectives of management,
markets for stock of PSINet and Metamor and other matters. Statements in this
document that are not historical facts are hereby identified as "forward-
looking statements" for the purpose of the safe harbor provided by Section 21E
of the Exchange Act and Section 27A of the Securities Act. Such forward-
looking statements, including, without limitation, those relating to the
future business prospects, revenues and income, in each case relating to
PSINet and Metamor, wherever they occur in this document, are necessarily
estimates reflecting the best judgment of the senior management of PSINet and
Metamor and involve a number of risks and uncertainties that could cause
actual results to differ materially from those suggested by the forward-
looking statements. Such forward-looking statements should, therefore, be
considered in light of various important factors, including those set forth in
this document. Important factors that could cause actual results to differ
materially from estimates or projections contained in the forward-looking
statements include without limitation:

  .  the ability to integrate the operations of PSINet and Metamor, including
     their respective services and products; and

  .  the effects of vigorous competition in the markets in which PSINet and
     Metamor operate.

   Words such as "estimate," "project," "plan," "intend," "expect," "believe,"
"anticipate" and similar expressions are intended to identify forward-looking
statements. These forward-looking statements are found at various places
throughout this document and the other documents incorporated by reference,
including, but not limited to, the Annual Report on Form 10-K for the year
ended December 31, 1999 of PSINet, including any amendments, and the Annual
Report on Form 10-K for the year ended December 31, 1999 of Metamor, including
any amendments. Readers are cautioned not to place undue reliance on these
forward-looking statements, which speak only as of the date of this document.
Neither PSINet nor Metamor undertakes any obligation to publicly update or
release any revisions to these forward-looking statements to reflect events or
circumstances after the date of this document or to reflect the occurrence of
unanticipated events.


                                      106
<PAGE>

                                                                         ANNEX 1


                          AGREEMENT AND PLAN OF MERGER

                           DATED AS OF MARCH 21, 2000

                                     AMONG

                                  PSINET INC.,

                             PSINET SHELF IV INC.,

                                      AND

                            METAMOR WORLDWIDE, INC.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----

                                   ARTICLE I

                                   The Merger

 <C>          <S>                                                           <C>
 Section 1.1  The Merger.................................................    1-1
 Section 1.2  Closing....................................................    1-1
 Section 1.3  Effective Time of the Merger...............................    1-1
 Section 1.4  Effect of the Merger.......................................    1-2

                                   ARTICLE II

                           The Surviving Corporation

 Section 2.1  Certificate of Incorporation...............................    1-2
 Section 2.2  By-Laws....................................................    1-2
 Section 2.3  Board of Directors; Officers...............................    1-2

                                  ARTICLE III

                              Conversion of Shares

 Section 3.1  Merger Consideration.......................................    1-2
 Section 3.2  Stockholders' Rights at the Effective Time.................    1-4
 Section 3.3  Surrender and Exchange of Share Certificates...............    1-4
 Section 3.4  No Further Rights..........................................    1-5

                                   ARTICLE IV

                   Representations and Warranties of Metamor

 Section 4.1  Organization and Qualification.............................    1-5
 Section 4.2  Capitalization.............................................    1-5
 Section 4.3  Authority Relative to this Agreement and the Transactions..    1-6
 Section 4.4  No Conflicts, Required Filings and Consents................    1-7
 Section 4.5  Reports and Financial Statements...........................    1-7
 Section 4.6  Information................................................    1-8
 Section 4.7  Litigation.................................................    1-9
 Section 4.8  Absence of Certain Changes or Events.......................    1-9
 Section 4.9  Employee Benefit Plans.....................................    1-9
 Section 4.10 Labor Relations............................................   1-11
 Section 4.11 Taxes......................................................   1-11
 Section 4.12 Compliance with Applicable Laws............................   1-12
 Section 4.13 Voting Requirements........................................   1-12
 Section 4.14 Assets of Metamor and Its Subsidiaries.....................   1-12
 Section 4.15 Material Contracts.........................................   1-13
 Section 4.16 Intellectual Property......................................   1-13
 Section 4.17 Interested Party Transactions..............................   1-14
 Section 4.18 Environmental Matters......................................   1-14
 Section 4.19 Restrictions on Business Activities........................   1-15
 Section 4.20 Certain Business Practices.................................   1-15
 Section 4.21 Insurance..................................................   1-16
 Section 4.22 Brokers; Expenses..........................................   1-16
 Section 4.23 Board Approval.............................................   1-16
 Section 4.24 Opinion of Metamor's Fairness Opinion Advisor..............   1-16
</TABLE>

                                       i
<PAGE>

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----

                                   ARTICLE V

                    Representations and Warranties of PSINet

 <C>          <S>                                                          <C>
 Section 5.1  Organization and Qualification............................   1-16
 Section 5.2  Capitalization............................................   1-17
 Section 5.3  Authority Relative to this Agreement......................   1-17
 Section 5.4  No Conflicts, Required Filings and Consents...............   1-17
 Section 5.5  Reports and Financial Statements..........................   1-18
 Section 5.6  Information...............................................   1-19
 Section 5.7  Litigation................................................   1-19
 Section 5.8  Absence of Certain Changes or Events......................   1-19
 Section 5.9  Voting Requirements.......................................   1-19
 Section 5.10 Brokers...................................................   1-19
 Section 5.11 Ownership of Metamor Common Stock.........................   1-19
 Section 5.12 Board Approval............................................   1-19

                                   ARTICLE VI

                     Conduct of Business Pending the Merger

 Section 6.1  Conduct of Business by Metamor and its Subsidiaries
                Pending the Merger......................................   1-20
 Section 6.2  Covenant of Buyer.........................................   1-21
 Section 6.3  Special Meetings..........................................   1-22
 Section 6.4  Further Action; Consents; Filings.........................   1-22
 Section 6.5  Plan of Reorganization....................................   1-22
 Section 6.6  Letters of Accountants....................................   1-23
 Section 6.7  Group Debt................................................   1-23

                                  ARTICLE VII

                             Additional Agreements

 Section 7.1  Access to Information.....................................   1-23
 Section 7.2  Registration Statement; Joint Proxy Statement/Prospectus..   1-24
 Section 7.3  Employee Retention........................................   1-25
 Section 7.4  Public Announcements......................................   1-25
 Section 7.5  Indemnification of Metamor's Directors and Officers and
                Insurance...............................................   1-25
 Section 7.6  Notice of Breaches........................................   1-27
 Section 7.7  Transfer and Gains Taxes and Certain Other Taxes and
                Expenses................................................   1-27
 Section 7.8  Acquisition Proposals.....................................   1-27
 Section 7.9  Metamor Related Agreement and PSINet Related Agreement....   1-28
 Section 7.10 Employee Benefits.........................................   1-28
 Section 7.11 Nasdaq Listing and Delisting..............................   1-29

                                  ARTICLE VIII

                              Conditions Precedent

 Section 8.1  Conditions to Each Party's Obligation to Effect the
                Merger..................................................   1-29
 Section 8.2  Conditions to Obligation of Metamor to Effect the Merger..   1-30
 Section 8.3  Conditions to Obligations of PSINet and Merger Subsidiary
                to Effect the Merger....................................   1-30
</TABLE>

                                       ii
<PAGE>

<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----

                                   ARTICLE IX

                       Termination, Amendment and Waiver

 <C>            <S>                                                       <C>
 Section 9.1    Termination.............................................  1-31
 Section 9.2    Effect of Termination...................................  1-32
 Section 9.3    Fees and Expenses.......................................  1-32
 Section 9.4    Amendment...............................................  1-33
 Section 9.5    Waiver..................................................  1-33

                                   ARTICLE X

                               General Provisions

                Non-Survival of Representations, Warranties and
 Section 10.1   Agreements..............................................  1-33
 Section 10.2   Notices.................................................  1-33
 Section 10.3   Specific Performance....................................  1-34
 Section 10.4   Entire Agreement........................................  1-34
 Section 10.5   Assignments; Parties in Interest........................  1-34
 Section 10.6   Governing Law...........................................  1-34
 Section 10.7   Headings; Disclosure....................................  1-35
 Section 10.8   Certain Definitions and Rules of Construction...........  1-35
 Section 10.9   Counterparts............................................  1-39
 Section 10.10  Severability............................................  1-39
 Section 10.11  Xpedior.................................................  1-39


 Exhibit 2.1    Amended and Restated Certificate of Incorporation of
                  PSINet Solutions Inc.
 Exhibit 6.1    Conduct of Business by Metamor and its Subsidiaries
 Exhibit 8.1(b) Material Third Party Consents
</TABLE>


                                      iii
<PAGE>

                          AGREEMENT AND PLAN OF MERGER

   This AGREEMENT AND PLAN OF MERGER (this "Agreement"), dated as of March 21,
2000, is entered into by and among PSINet INC., a New York corporation
("PSINet" or "Buyer"), PSINET SHELF IV INC., a Delaware corporation and wholly-
owned subsidiary of PSINet ("Merger Subsidiary"), and METAMOR WORLDWIDE, INC.,
a Delaware corporation ("Metamor"). Capitalized terms used in this Agreement
and not defined in context shall have the meanings ascribed to them in Section
10.8 hereof.

   WHEREAS, the respective Boards of Directors of PSINet, Merger Subsidiary and
Metamor have approved the merger of Merger Subsidiary with and into Metamor,
with Metamor being the surviving corporation as a wholly-owned subsidiary of
PSINet (the "Merger"), all upon the terms and subject to the conditions set
forth herein; and

   WHEREAS, it is intended that, for federal income tax purposes, the Merger
shall qualify as a reorganization under the provisions of Section 368 of the
Internal Revenue Code of 1986, as amended, and the rules and regulations
promulgated thereunder (the "Code"); and

   WHEREAS, contemporaneously with the execution and delivery of this
Agreement, as a condition and inducement to PSINet's and Merger Subsidiary's
willingness to enter into this Agreement, Peter T. Dameris is entering into a
stockholders agreement (the "Metamor Related Agreement") pursuant to which,
among other things, he agrees to vote in favor of the Merger under the terms
and conditions set forth in the Metamor Related Agreement; and

   WHEREAS, contemporaneously with the execution and delivery of this
Agreement, as a condition and inducement to Metamor's willingness to enter into
this Agreement, William L. Schrader is entering into a stockholders agreement
(the "PSINet Related Agreement") pursuant to which, among other things, he
agrees to vote in favor of the issuance of the shares of PSINet Common Stock in
the Merger under the terms and conditions set forth in the PSINet Related
Agreement;

   NOW, THEREFORE, in consideration of the foregoing premises and the
representations, warranties and agreements contained herein and for other good
and valuable consideration, the receipt and adequacy of which are hereby
acknowledged, the parties hereto, intending to be legally bound, agree as
follows:

                                   ARTICLE I

                                   The Merger

   Section 1.1 The Merger. Upon the terms and subject to the conditions of this
Agreement, at the Effective Time, Merger Subsidiary shall be merged with and
into Metamor and the separate existence of Merger Subsidiary shall thereupon
cease. Metamor shall continue as the surviving corporation in the Merger
(thereafter referred to as the "Surviving Corporation") under the laws of the
State of Delaware under the name "PSINet Solutions, Inc." as a wholly-owned
subsidiary of PSINet. Throughout this Agreement, the term "Metamor" shall refer
to such entity prior to the Merger and the term "Surviving Corporation" shall
refer to it in its status as the surviving corporation in the Merger.

   Section 1.2 Closing. The closing of the Transactions (the "Closing") will
take place as promptly as practicable (and in any event within two business
days) after satisfaction or waiver of the conditions set forth in Article VIII.
The Closing shall be held at the offices of Nixon Peabody LLP, 437 Madison
Avenue, New York, New York 10022, unless another place is agreed to in writing
by the parties hereto. The date on which the Closing occurs is referred to
herein as the "Closing Date".

   Section 1.3 Effective Time of the Merger. The Merger shall become effective
upon the filing with the Secretary of State of the State of Delaware of a
certificate of merger (the "Certificate of Merger"), or at such later time as
specified therein, with respect to the Merger pursuant to and in compliance
with this Agreement

                                      1-1
<PAGE>

and Section 251 of the General Corporation Law of the State of Delaware (the
"Delaware Law"). The Certificate of Merger shall be filed immediately following
the commencement of the Closing. When used in this Agreement, the term
"Effective Time" shall mean the time at which the Certificate of Merger becomes
effective in accordance with Delaware Law.

   Section 1.4 Effect of the Merger. The Merger shall, from and after the
Effective Time, have all the effects provided by applicable Law. If, at any
time after the Effective Time, the Surviving Corporation shall consider or be
advised that any further deeds, conveyances, assignments or assurances in Law
or any other acts are necessary, desirable or proper to vest, perfect or
confirm, of record or otherwise, in the Surviving Corporation the title to any
property or rights of Metamor or Merger Subsidiary, by reason or as a result of
the Merger, or otherwise to carry out the purposes of this Agreement, Metamor
and Merger Subsidiary agree that the Surviving Corporation and its proper
officers and directors shall execute and deliver all such deeds, conveyances,
assignments and assurances in Law and do all things necessary, desirable or
proper to vest, perfect or confirm title to such property or rights in the
Surviving Corporation and otherwise to carry out the purposes of this
Agreement, and that the proper officers and directors of the Surviving
Corporation are fully authorized in the name of each of Metamor and Merger
Subsidiary or otherwise to take any and all such action.

                                   ARTICLE II

                           The Surviving Corporation

   Section 2.1 Certificate of Incorporation. The certificate of incorporation
of Metamor shall be amended at the Effective Time to read in its entirety in
the form attached hereto as EXHIBIT 2.1 and shall be the certificate of
incorporation of the Surviving Corporation until thereafter duly amended.

   Section 2.2 By-Laws. The by-laws of Metamor shall be amended as of the
Effective Time to be identical with the by-laws of Merger Subsidiary and shall
be the by-laws of the Surviving Corporation until thereafter duly amended.

   Section 2.3 Board of Directors; Officers. The members of the Board of
Directors and the officers of the Surviving Corporation following the Merger
shall be the directors and officers of Merger Subsidiary immediately prior to
the Effective Time, and such directors and officers shall continue in office
until the earlier of their respective death, resignation or removal and the
time that their respective successors are duly elected or appointed and
qualified.

                                  ARTICLE III

                              Conversion of Shares

   Section 3.1 Merger Consideration. (a) As of the Effective Time, by virtue of
the Merger and without any action on the part of any stockholder of Metamor or
Merger Subsidiary:

     (i) Each share of common stock, no par value per share, of Merger
  Subsidiary that is issued and outstanding immediately prior to the
  Effective Time shall be automatically converted without any further action
  into one fully paid and non-assessable share of common stock, no par value
  per share, of the Surviving Corporation, and shall constitute the only
  issued and outstanding capital stock of the Surviving Corporation following
  the Merger.

     (ii) Each share of the common stock of Metamor, par value $.01 per share
  ("Metamor Common Stock"), that is owned by Metamor as treasury stock and
  any shares of Metamor Common Stock that are owned by PSINet or any of its
  Subsidiaries shall be canceled and shall cease to exist, and no stock of
  PSINet or other consideration shall be delivered in exchange therefor.

     (iii) Subject to the provisions of this Section 3.1(a), the shares of
  Metamor Common Stock, other than the shares canceled pursuant to Section
  3.1(a)(ii), issued and outstanding immediately prior to the

                                      1-2
<PAGE>

  Effective Time shall, by virtue of the Merger and without any action on the
  part of the holders thereof, be converted into the right to receive validly
  issued, fully paid and non-assessable (subject to Section 630 of the New
  York Business Corporation Law) shares of Common Stock of PSINet, par value
  $.01 per share ("PSINet Common Stock"), at an exchange ratio (the "Exchange
  Ratio") of 0.9 shares of PSINet Common Stock for each share of Metamor
  Common Stock (the "Merger Consideration").

     (b) If, at any time during the period between the date of this Agreement
  and the Effective Time, Metamor changes the number of shares of Metamor
  Common Stock issued and outstanding or PSINet changes the number of shares
  of PSINet Common Stock issued and outstanding, in each case as a result of
  a stock split, reverse stock split, stock dividend, recapitalization,
  redenomination of share capital or other similar transaction with an
  effective date or record date, as applicable, prior to the Effective Time,
  the Exchange Ratio and any other items dependent thereon shall be
  appropriately adjusted.

     (c) In connection with the Merger:

       (i) At the Effective Time, automatically and without any action on
    the part of the holder thereof, each option (whether or not vested) to
    purchase shares of Metamor Common Stock granted under all Metamor stock
    option plans, including any stock option plan intended to be qualified
    under Section 423 of the Code (each such option a "Metamor Option" and
    each such plan a "Metamor Stock Option Plan"), which remains as of such
    time unexercised in whole or in part, shall be assumed by PSINet and
    become an option (an "Assumed Metamor Option") to purchase that number
    of shares of PSINet Common Stock obtained by multiplying the number of
    shares of Metamor Common Stock issuable upon the exercise of such
    Metamor Option by the Exchange Ratio at an exercise price per share
    equal to the per share exercise price of such Metamor Option divided by
    the Exchange Ratio. If the foregoing calculation results in an Assumed
    Metamor Option being exercisable for a fraction of a share of PSINet
    Common Stock, the number of shares of PSINet Common Stock subject to
    such Assumed Metamor Option shall be rounded down to the nearest whole
    number of shares. The Assumed Metamor Option (A) shall provide the
    optionee with the same vesting and other rights, limitations and
    obligations that the optionee had under the Metamor Option before such
    assumption, and (B) shall not give the optionee additional vesting or
    other rights, limitations or obligations that he did not have under the
    Metamor Option before such assumption.

       (ii) As soon as practicable after the Effective Time, PSINet (A)
    shall deliver to the holders of the Metamor Options appropriate
    agreements evidencing PSINet's assumption of such options, and (B)
    shall file a registration statement on Form S-8 (or any successor or
    other appropriate forms) with respect to the shares of PSINet Common
    Stock issuable in respect of the Assumed Metamor Options. PSINet shall
    use all reasonable efforts to maintain the effectiveness of such
    registration statement (and maintain the current status of the
    prospectus or prospectuses contained therein) for so long as such
    Assumed Metamor Options remain outstanding.

       (iii) At the Effective Time, PSINet agrees to assume the Metamor
    Stock Option Plans with such amendments thereto as may be required to
    reflect the Merger, including the substitution of PSINet Common Stock
    for Metamor Common Stock thereunder.

       (iv) The Board of Directors of Metamor (or a duly appointed
    committee thereof responsible for the administration of the Metamor
    Stock Option Plans in accordance with the terms of each such plan)
    shall, prior to or as of the Effective Time, take all necessary
    actions, pursuant to and in accordance with the terms of the Metamor
    Stock Option Plans and the instruments evidencing the Metamor Options,
    to provide for the conversion of the Metamor Options into the Assumed
    Metamor Options in accordance with subparagraph (i) above.

       (v) All Metamor Options shall, prior to and subsequent to the
    Effective Time, continue to vest and be exercisable under the terms of
    the respective Metamor Option and associated Metamor Stock Option Plan.

                                      1-3
<PAGE>

   Section 3.2 Stockholders' Rights at the Effective Time. On and after the
Effective Time, the certificates that immediately prior to the Effective Time
represented shares of Metamor Common Stock (the "Certificates"), shall cease to
represent any rights with respect to Metamor Common Stock and shall only
represent the right to receive the Merger Consideration, together with the
amount of cash, if any, payable in lieu of fractional shares of PSINet Common
Stock otherwise issuable as Merger Consideration; provided, however, that no
dividends or other distributions, if any, in respect of the shares of PSINet
Common Stock, declared after the Effective Time and payable to holders of
record after the Effective Time, shall be paid to the holders of any
unsurrendered Certificates until such Certificates and transmittal letters are
surrendered and delivered as provided in Section 3.3 of this Agreement. Subject
to applicable New York Law, after the surrender and exchange of Certificates,
the record holders thereof will be entitled to receive any such dividends or
other distributions declared after the Effective Time without interest thereon,
which theretofore have become payable with respect to the number of shares of
PSINet Common Stock for which such Certificates were exchangeable. As of the
Effective Time, the holders of Metamor Common Stock as of the Effective Time
who are entitled to receive shares of PSINet Common Stock as Merger
Consideration shall be deemed to be record owners of such shares of PSINet
Common Stock as of the Effective Time and shall thereupon be entitled to
exercise any rights as a holder of PSINet Common Stock, including the right to
vote such PSINet Common Stock, whether or not the Certificates are surrendered
and exchanged pursuant to this Agreement.

   Section 3.3 Surrender and Exchange of Share Certificates.

   (a) Promptly after the Closing Date, PSINet shall make available to a paying
agent reasonably acceptable to the parties (the "Paying Agent") such
certificates evidencing such number of shares of PSINet Common Stock to enable
the Paying Agent to deliver the PSINet Common Stock as Merger Consideration
pursuant to Section 3.1(a) and an amount of cash as shall be reasonably
estimated as needed to make cash payments in lieu of fractional shares.
Notwithstanding any other provision of this Agreement, no fractional shares of
PSINet Common Stock will be issued in connection with the Merger, and any
holder of Metamor Common Stock entitled to receive a fractional share of PSINet
Common Stock but for this Section 3.3(a) shall be entitled to receive a cash
payment in lieu thereof, which payment shall represent such holder's
proportionate interest in such share of PSINet Common Stock. For purposes of
determining the amount of the cash payable in lieu of a fractional share, one
full share of PSINet Common Stock shall be deemed to have a value equal to $50.

   (b) On the Closing Date, PSINet shall instruct the Paying Agent to mail to
each Person who was a holder of record of shares of Metamor Common Stock
immediately prior to the Effective Time (other than holders whose shares were
canceled pursuant to Section 3.1(a)(ii)): (i) a letter of transmittal, and (ii)
instructions for use in effecting the surrender of the Certificates nominally
representing Metamor Common Stock in exchange for the Merger Consideration.

   (c) After the Closing, each holder of a Certificate shall surrender and
deliver such Certificate to the Paying Agent together with a duly completed and
executed transmittal letter. Upon such surrender and delivery, the holder shall
receive the Merger Consideration. Until so surrendered and exchanged, each
Certificate formerly representing an outstanding share of Metamor Common Stock
shall, after the Effective Time, be deemed for all purposes to evidence only
the right to receive the Merger Consideration as provided in Section
3.1(a)(iii), together with cash in lieu of any fractional share of PSINet
Common Stock.

   (d) At the Effective Time, the stock transfer books of Metamor shall be
closed and no transfer of shares of Metamor Common Stock shall be recorded
thereafter, other than transfers of shares of Metamor Common Stock that have
occurred prior to the Effective Time. In the event that, after the Effective
Time, Certificates are presented for transfer to the transfer agent for
Metamor, Merger Subsidiary or PSINet, they shall be delivered to the Paying
Agent and exchanged for the Merger Consideration as provided for in this
Section 3.3.

   (e) Any Merger Consideration that remains undistributed to the stockholders
of Metamor as of the Effective Time after four months have elapsed following
the Effective Time shall be delivered to PSINet by the

                                      1-4
<PAGE>

Paying Agent, upon demand, and any former stockholders of Metamor who have not
previously complied with this Section 3.3 shall thereafter look only to PSINet
for payment of their claim for the Merger Consideration or dividends or
distributions with respect to PSINet Common Stock.

   (f) Neither the Paying Agent, nor any of Metamor, Merger Subsidiary or
PSINet shall be liable to any holder of shares of Metamor Common Stock with
respect to any Merger Consideration (or dividends or distributions with respect
to PSINet Common Stock) delivered to a public official pursuant to any
applicable abandoned property, escheat or similar Law.

   (g) In the event any Certificates shall have been lost, stolen or destroyed,
the Paying Agent shall deliver the Merger Consideration and any dividends or
other distributions with respect to PSINet Common Stock to which such holder is
entitled in exchange for such lost, stolen or destroyed Certificates, upon the
making of an affidavit of that fact by the record holder thereof and the
delivery of such bond as the Paying Agent may reasonably require.

   (h) No transfer taxes shall be payable by any stockholder of Metamor in
respect of the issuance of the PSINet Common Stock under this Section 3.3,
except that if any PSINet Common Stock is to be issued in a name other than
that in which the Certificate surrendered has been registered, it shall be a
condition of such issuance that the Person requesting such issuance shall pay
to PSINet any transfer taxes payable by reason thereof, or of any prior
transfer of such surrendered Certificate, or establish to the satisfaction of
PSINet that such taxes have been paid or are not payable.

   Section 3.4 No Further Rights. From and after the Effective Time, holders of
Certificates theretofore evidencing shares of Metamor Common Stock shall cease
to have any rights as stockholders of Metamor, except as provided herein or by
Law.

                                   ARTICLE IV

                   Representations and Warranties of Metamor

   Metamor represents and warrants to PSINet and Merger Subsidiary that, except
as disclosed in the Metamor Disclosure Schedule which has been delivered to
PSINet prior to the execution of this Agreement (the "Metamor Disclosure
Schedule"):

   Section 4.1 Organization and Qualification. Metamor is a corporation duly
incorporated, validly existing and in good standing under the laws of the State
of Delaware. Each of Metamor's Subsidiaries is a corporation or limited
liability company duly organized, validly existing and, if applicable, in good
standing under the laws of the jurisdiction in which it is formed. Each of
Metamor and its Subsidiaries has the requisite corporate power and authority to
carry on its business as it is now being conducted and is duly qualified or
licensed to do business, and, if applicable, is in good standing, in each
jurisdiction where the character of its properties owned or held under lease or
the nature of its activities makes such qualification or licensing necessary,
except where the failure to be so organized, qualified, licensed or in good
standing, or to have such power and authority, when taken together with all
other such failures would not have a Metamor Material Adverse Effect. Metamor
has heretofore made available to PSINet and Merger Subsidiary a complete and
correct copy of the certificate of incorporation, by-laws or other governing
documents, each as amended to the date hereof, of Metamor and each of its
Subsidiaries.

   Section 4.2 Capitalization.

   (a) The authorized capital stock of Metamor consists of 100,000,000 shares
of Metamor Common Stock and 5,000,000 shares of preferred stock, par value
$0.01 per share (the "Metamor Preferred Stock"). As of March 8, 2000: (a)
34,692,972 shares of Metamor Common Stock were issued and outstanding, all of
which

                                      1-5
<PAGE>

were validly issued, fully paid and non-assessable, (b) an aggregate of
8,000,000 shares of Metamor Common Stock were reserved for issuance under stock
options to be issued pursuant to Metamor's employee and director stock option
plans, (c) an aggregate of 3,450,000 shares of Metamor Common Stock were
reserved for issuance under rights to purchase Metamor Common Stock pursuant to
Metamor's Employee Stock Purchase Plan, and (d) no shares of Metamor Preferred
Stock were issued or outstanding. As of March 8, 2000, there were outstanding
Metamor Options to purchase 3,851,042 shares of Metamor Common Stock. Except as
set forth on the Metamor Disclosure Schedule, no Metamor Options will be
subject to accelerated vesting or exercisability in connection with the
execution and delivery of this Agreement or the Merger. No shares of capital
stock of Metamor or any of its Subsidiaries other than Xpedior have been issued
between March 8, 2000 and the date hereof other than pursuant to the exercise
or conversion of any Metamor Options. Since March 8, 2000 through the date
hereof, options to purchase 747,100 shares of shares of Metamor Common Stock
have been granted.

   (b) The authorized capital stock of Xpedior Incorporated, a Delaware
corporation and Subsidiary of Metamor ("Xpedior"), consists of 100,000,000
shares of common stock, par value $.01 per share ("Xpedior Common Stock") and
5,000,000 shares of preferred stock, par value $0.01 per share (the "Xpedior
Preferred Stock"). As of March 20, 2000: (a) 50,000,000 shares of Xpedior
Common Stock were issued and outstanding, all of which were validly issued,
fully paid and non-assessable and 40,005,048 of which are owned beneficially
and of record by Metamor, (b) an aggregate of 15,000,000 shares of Xpedior
Common Stock were reserved for issuance under stock options issued pursuant to
the Xpedior's Stock Incentive Plan (the "Xpedior Stock Options"), and (c) no
shares of Xpedior Preferred Stock were issued or outstanding. As of January 31,
2000, there were outstanding Xpedior Stock Options to purchase 10,109,350
shares of Xpedior Common Stock. Except as set forth on the Metamor Disclosure
Schedule, no Xpedior Stock Options will be subject to accelerated vesting or
exercisability in connection with the execution and delivery of this Agreement
or the Merger. No shares of capital stock of Xpedior or any of its Subsidiaries
have been issued between March 20, 2000 and the date hereof.

   (c) Except for the Metamor Notes or as set forth in this Section 4.2 or the
Metamor Disclosure Schedule, there are no preemptive or other outstanding
rights, options, warrants, conversion rights (including pursuant to convertible
securities), stock appreciation rights, redemption rights, repurchase rights,
agreements, arrangements, calls, commitments or rights of any kind relating to
the issued or unissued capital stock of Metamor or any of its Subsidiaries or
obligating Metamor or any of its Subsidiaries to issue or sell any shares of
capital stock of, or other equity interests in, Metamor or any of its
Subsidiaries. All shares of capital stock of Metamor and its Subsidiaries
subject to issuance pursuant to the Metamor Options, upon issuance on the terms
and conditions specified in the instruments pursuant to which they are
issuable, will be duly authorized, validly issued, fully paid and non-
assessable. Without limiting the generality of the foregoing, neither Metamor
nor any of its Subsidiaries has adopted a shareholder rights plan or similar
plan or arrangement. As of the date of this Agreement, there are no outstanding
contractual obligations of Metamor or any of its Subsidiaries to repurchase,
redeem or otherwise acquire any shares of capital stock of Metamor or any of
its Subsidiaries or to provide material funds to, or make any material
investment (in the form of a loan, capital contribution or otherwise) in, any
Person except as set forth on the Metamor Disclosure Schedule.

   Section 4.3 Authority Relative to this Agreement and the
Transactions. Metamor has all necessary power and authority to execute and
deliver this Agreement and the Metamor Related Agreement, to perform its
obligations hereunder and thereunder and to consummate the Merger. The
execution and delivery by Metamor of this Agreement and the Metamor Related
Agreement, and the consummation by Metamor of the Transactions to which it is a
party, have been duly and validly authorized by all necessary corporate action
and no other corporate proceedings on the part of Metamor are necessary to
authorize the execution and delivery of this Agreement or the Metamor Related
Agreement to which Metamor is a party or to consummate the Transactions to
which it is a party other than, with respect to the Merger, the adoption of
this Agreement by the affirmative vote of the holders of a majority of the
outstanding shares of Metamor Common Stock entitled to be voted at the Metamor
Special Meeting and the filing and recordation of appropriate merger documents
as

                                      1-6
<PAGE>

required by Delaware Law. This Agreement and the Metamor Related Agreement have
been duly and validly executed and delivered by Metamor and, assuming the due
authorization, execution and delivery by the other parties hereto and thereto,
each constitutes a legal, valid and binding obligation of Metamor, enforceable
against Metamor in accordance with its terms.

   Section 4.4 No Conflicts, Required Filings and Consents.

   (a) The execution and delivery of this Agreement by Metamor does not, and
the performance of this Agreement and consummation of the Transactions by
Metamor will not: (i) conflict with or violate the certificate of incorporation
or by-laws of Metamor or any of its Subsidiaries, (ii) assuming the consents,
approvals, authorizations and waivers specified in Section 4.4(b) have been
received and the waiting periods referred to therein have expired, and any
condition precedent to such consent, approval, authorization, or waiver has
been satisfied, conflict with or violate any Law applicable to Metamor or any
of its Subsidiaries or by which any property or asset of Metamor or any of its
Subsidiaries is bound or affected, or (iii) result in any breach of or
constitute a default (or an event which with notice or lapse of time or both
would become a default) under, or give to others any right of termination,
amendment, acceleration, or cancellation of, or result in the creation of a
lien or other encumbrance on any property or asset of Metamor or any of its
Subsidiaries pursuant to, any contract, agreement, note, bond, mortgage,
indenture, credit agreement, lease, license, permit, franchise or other
instrument or obligation to which Metamor or any of its Subsidiaries is a party
or by which Metamor or any of its Subsidiaries or any property or asset of
Metamor or any of its Subsidiaries is bound or affected, except in the case of
clauses (ii) and (iii) for any such conflicts, violations, breaches, defaults
or other occurrences of the type referred to above which would not have a
Metamor Material Adverse Effect or would not prevent or materially delay the
consummation of the Merger.

   (b) The execution and delivery of this Agreement by Metamor does not, and
the performance of this Agreement by Metamor will not, require any consent,
approval, authorization, waiver or permit of, or filing with or notification
to, any governmental or regulatory authority, domestic, foreign or
supranational (a "Governmental Entity"), except for applicable requirements of
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), the
Securities Act of 1933, as amended (the "Securities Act"), state securities or
"blue sky" laws ("Blue Sky Laws"), the pre-merger notification requirements of
the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the
rules and regulations thereunder (the "HSR Act"), such filings, approvals,
consents and waivers as may be required under other Merger Control Laws, filing
and recordation of the Certificate of Merger as required by Delaware Law, and
applications for listing and other filings required by the rules of the Nasdaq
National Market System, except where failure to obtain such consents,
approvals, authorizations or permits, or to make such filings or notifications,
would not have a Metamor Material Adverse Effect or would not prevent or
materially delay the consummation of the Merger.

   Section 4.5 Reports and Financial Statements.

   (a) Metamor has filed with the U.S. Securities and Exchange Commission (the
"SEC") all forms, reports, schedules, registration statements, definitive proxy
statements, information statements and other filings (the "Metamor SEC
Reports") required to be filed by it with the SEC since January 1, 1998.
Xpedior has filed with the SEC only a registration statement under the
Securities Act on Form S-1 and amendments thereto, a final Prospectus pursuant
to Rule 424(b)(1) of the Securities Act (the "Final Prospectus") and a
registration statement under the Exchange Act on Form 8-A (such filings,
together with all forms, reports, schedules, registration statements,
definitive proxy statements, information statements and other filings hereafter
filed with the SEC, the "Xpedior SEC Reports" and, together with the Metamor
SEC Reports, the "SEC Reports"). As of their respective dates, the SEC Reports
complied as to form in all material respects with the requirements of the
Exchange Act and the Securities Act, as the case may be, and the rules and
regulations of the SEC thereunder applicable to such SEC Reports. As of their
respective dates and as of the date any information from such SEC Reports has
been incorporated by reference, the SEC Reports did not contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements

                                      1-7
<PAGE>

therein, in light of the circumstances under which they were made, not
misleading. Metamor and Xpedior have filed all material contracts and
agreements and other documents or instruments required to be filed as exhibits
to the SEC Reports.

   (b) The consolidated balance sheets of Metamor as of December 31, 1998, 1997
and 1996 and the related consolidated statements of operations, stockholders'
equity and cash flows for each of the three years in the three-year period
ended December 31, 1998 (including the related notes and schedules thereto)
contained in Metamor's Form 10-K for the year ended December 31, 1998 (the
"Metamor Financial Statements") present fairly, in all material respects, the
consolidated financial position and the consolidated results of operations,
retained earnings and cash flows of Metamor and its consolidated Subsidiaries
as of the dates or for the periods presented therein in conformity with United
States generally accepted accounting principles ("GAAP") applied on a
consistent basis during the periods involved except as otherwise noted therein,
including in the related notes. The consolidated balance sheets of Xpedior as
of September 30, 1999 and December 31, 1998 and 1997 and the related
consolidated statements of operations, stockholders' equity and cash flows for
the nine months ended September 30, 1999, the year ended December 31, 1998 and
the period from March 27, 1997 through December 31, 1997 (including the related
notes and schedules thereto) contained in the Final Prospectus (the "Xpedior
Financial Statements") present fairly, in all material respects, the
consolidated financial position and the consolidated results of operations,
retained earnings and cash flows of Xpedior and its consolidated Subsidiaries
as of the dates or for the periods presented therein in conformity with GAAP
applied on a consistent basis during the periods involved except as otherwise
noted therein, including in the related notes.

   (c) The consolidated balance sheets and the related statements of operations
and cash flows (including, in each case, the related notes thereto) of Metamor
contained in the Form 10-Q for the quarterly period ended September 30, 1999
(the "Metamor Quarterly Financial Statements") have been prepared in accordance
with the requirements for interim financial statements contained in Regulation
S-X, which do not require all the information and footnotes necessary for a
fair presentation of financial position, results of operations and cash flows
in conformity with GAAP. The Metamor Quarterly Financial Statements reflect all
adjustments necessary to present fairly in accordance with GAAP (except as
indicated), in all material respects, the consolidated financial position,
results of operations and cash flows of Metamor and its consolidated
Subsidiaries for all periods presented therein.

   (d) The adoption of SEC Staff Accounting Bulletin No. 101 (Revenue
Recognition in Financial Statements) effective January 1, 2000 will not
adversely impact, in any material respect, the amount or timing of revenue
recognition by Metamor and its Subsidiaries as compared to their prior revenue
recognition practices.

   (e) Except for those liabilities that are fully reflected or reserved
against on the Metamor Financial Statements, the Metamor Quarterly Financial
Statements or the Xpedior Financial Statements or as set forth in the Metamor
Disclosure Schedule, neither Metamor nor any of its Subsidiaries has
outstanding any liability of any nature whatsoever (whether absolute, accrued,
contingent, or otherwise and whether due or to become due) which would be
required to be reflected on a balance sheet or in the notes thereto prepared in
accordance with GAAP, except for (i) liabilities and obligations which have
been incurred since September 30, 1999 in the ordinary course of business which
are not material in nature or amount, or (ii) liabilities and obligations which
individually or in the aggregate would not have a Metamor Material Adverse
Effect.

   Section 4.6 Information.

   (a) None of the information supplied or to be supplied by Metamor for
inclusion or incorporation by reference in the Joint Proxy Statement/Prospectus
will, at the time of filing with the SEC, at the time of the mailing of the
Joint Proxy Statement/Prospectus or any amendments or supplements thereto to
Metamor's and PSINet's stockholders or at the time of the Metamor Special
Meeting or the PSINet Special Meeting, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary in order to make the statements therein, in light of the
circumstances under which they are made, not

                                      1-8
<PAGE>

misleading. The portion of the Joint Proxy Statement/Prospectus based on
information supplied by Metamor for inclusion or incorporation by reference
therein will comply as to form in all material respects with the applicable
provisions of the Securities Act and the Exchange Act and the rules and
regulations thereunder.

   (b) As of the date of this Agreement, Metamor does not know of any reason
(A) why it would not be able to deliver to the respective counsel to PSINet and
Metamor, at the date of the legal opinions referred to below, certificates
substantially in compliance with published Internal Revenue Service ("IRS")
advance ruling guidelines, with customary exceptions and modifications thereto,
to enable such firms to deliver the legal opinions contemplated by Sections
8.2(c) and 8.3(c), or (B) why counsel to PSINet and Metamor would not be able
to deliver the opinions required by Sections 8.2(c) and 8.3(c).

   Section 4.7 Litigation. Except as disclosed in the SEC Reports or on the
Metamor Disclosure Schedule, as of the date hereof, there is no civil, criminal
or administrative suit, action or proceeding pending or, to the knowledge of
Metamor, threatened against or affecting Metamor or any of its Subsidiaries
that is reasonably expected to have a Metamor Material Adverse Effect, nor is
there any judgment, decree, injunction or order of any Governmental Entity or
arbitrator outstanding against Metamor or any of its Subsidiaries having, or
which is reasonably expected to have, individually or in the aggregate, a
Metamor Material Adverse Effect.

   Section 4.8 Absence of Certain Changes or Events. Except as disclosed in the
SEC Reports, in the Metamor Financial Statements, in the Metamor Quarterly
Financial Statements or on the Metamor Disclosure Schedule or as permitted by
Section 6.1 for events after the date hereof, since September 30, 1999 each of
Metamor and its Subsidiaries has conducted its business only in the ordinary
course and in a manner consistent with past practice and since such date there
has not been (i) any Metamor Material Adverse Effect, (ii) any declaration,
setting aside or payment of any dividend or other distribution (whether in
cash, stock or property) with respect to any of Metamor's or any of its
Subsidiaries' capital stock, or, any redemption, purchase or other acquisition
of any of its or any of its Subsidiaries' capital stock, (iii) any split,
combination or reclassification of any of Metamor's or its Subsidiaries'
capital stock or, except with respect to Metamor Options or Xpedior Stock
Options, any issuance or the authorization of any issuance of any other
securities in respect of, in lieu of or in substitution for shares of Metamor's
or its Subsidiaries' capital stock, (iv) any granting by Metamor or any of its
Subsidiaries to any officer of Metamor or any of its Subsidiaries of any
increase in compensation or any rights with respect to compensation in the
event of a "change in control" (however defined) of Metamor, except in the
ordinary course of business consistent with prior practice or as required under
employment agreements in effect as of September 30, 1999, (v) any granting by
Metamor or any of its Subsidiaries to any officer or any group or class of
employees of Metamor of any increase in severance or termination pay, except as
required under employment, severance or termination agreements or plans in
effect as of September 30, 1999 or as previously disclosed to PSINet, (vi) any
entry by Metamor or any of its Subsidiaries into any employment, severance or
termination agreement with any officer of Metamor, or any increase in benefits
available under or establishment of any Benefit Plan except in the ordinary
course of business consistent with past practice or as previously disclosed to
PSINet, or (vii) any material change in accounting methods, principles or
practices by Metamor, except insofar as may have been required by a change in
GAAP.

   Section 4.9 Employee Benefit Plans.

   (a) Schedule 4.9 sets forth a complete and correct list of all existing (i)
"employee benefit plans", as defined in Section 3(3) of the Employee Retirement
Income Security Act of 1974, as amended ("ERISA"), and (ii) any other material
pension plans or employee benefit arrangements or payroll practices (including
severance pay, vacation pay, company awards, salary continuation for
disability, sick leave, deferred compensation, bonus or other incentive
compensation, stock option or stock purchase arrangements or policies)
maintained, or contributed to, by Metamor, its Subsidiaries or any trade or
business (whether or not incorporated) which is treated with Metamor or its
Subsidiaries as a single employer under Section 414(b), (c), (m) or (o) of the
Code (an "ERISA Affiliate") with respect to employees of Metamor, its
Subsidiaries or their ERISA Affiliates (all such plans, arrangements or
practices that currently exist or have been in existence at any

                                      1-9
<PAGE>

time during the last three (3) years are hereinafter referred to as the
"Benefit Plans"). Each Benefit Plan is in writing and Metamor has previously
made available to PSINet a true and complete copy of each existing Benefit Plan
document, including all amendments thereto, and a true and complete copy of
each material document, if any, prepared in connection with each such Benefit
Plan, including: (A) a copy of each trust or other funding arrangement, (B)
each summary plan description and summary of material modifications, (C) the
most recently filed Form 5500, including all attachments thereto, (D) the most
recently received IRS determination letter for each such Benefit Plan, and (E)
the most recently prepared actuarial report and financial statement in
connection with each such Benefit Plan. Neither Metamor nor any of its
Subsidiaries have any express or implied commitment (X) to create or incur
material liability with respect to or cause to exist any other employee benefit
plan, program or arrangement, (Y) to enter into any material contract or
agreement to provide compensation or benefits to any individual, or (Z) to
materially modify, change or terminate any Benefit Plan, other than with
respect to a modification, change or termination required by ERISA or the Code
or a merger of a previously acquired 401(k) or welfare plan.

   (b) No "accumulated funding deficit" as defined in Section 412 of the Code
exists with respect to any Benefit Plan, whether or not waived. No "reportable
event" within the meaning of Section 4043 of ERISA, and no event described in
Section 4062 or 4063 of ERISA has occurred with respect to any Benefit Plan.
Neither Metamor nor any ERISA Affiliate of Metamor has: (i) engaged in, or is a
successor corporation or parent corporation to an entity that has engaged in, a
transaction described in sections 4069 or 4212(c) of ERISA or (ii) incurred or
reasonably expects to incur (A) any material liability under Title IV of ERISA
arising in connection with the termination of, or a complete or partial
withdrawal from, any plan covered or previously covered by Title IV of ERISA,
or (B) any material liability under Section 4971 of the Code that in either
case could become a liability of the Surviving Corporation or PSINet or any of
its Affiliates after the Effective Time. As of September 30, 1999, there was no
material unfunded liability under any of the Benefit Plans, computed using
reasonable actuarial assumptions and determined as if all benefits under such
Benefit Plans were vested and payable as of such date. No event has occurred
since September 30, 1999 which would cause Metamor to believe that as of the
date of this Agreement there is any such material unfunded liability.

   (c) Each of the Benefit Plans intended to qualify under Section 401(a) of
the Code has received a favorable determination letter (or opinion letter in
the case of a prototype plan) from the IRS that such Benefit Plan is so
qualified or is within the remedial amendment period for applying for such a
determination letter, and, except as disclosed on the Metamor Disclosure
Schedule, nothing has occurred with respect to the operation of any such
Benefit Plan which, either individually or in the aggregate, would cause the
loss of such qualification or the imposition of any material liability, penalty
or tax under ERISA or the Code.

   (d) There has been no non-exempt prohibited transaction (within the meaning
of Section 406 of ERISA or Section 4975 of the Code) with respect to any
Benefit Plan. Metamor, its Subsidiaries and their ERISA Affiliates are not
currently liable for any excise tax or penalty in connection with any Benefit
Plan arising under the Code or ERISA, including but not limited to Section
4971, 4972, 4975, 4979, 4980, 4980B or 4980D of the Code or Section 502 of
ERISA, and to the knowledge of Metamor no fact or event exists which could give
rise to any liability except, in each case, for any such liability set forth on
the Metamor Disclosure Schedule or which would not have a Metamor Material
Adverse Effect.

   (e) All contributions and premiums required by Law or by the terms of any
Benefit Plan or any agreement relating thereto have been timely made (without
regard to any waivers granted with respect thereto) in all material respects.

   (f) The liabilities of each Benefit Plan that has been terminated or
otherwise wound up, have been fully discharged in material compliance with
applicable Law.

   (g) There has been no violation of ERISA with respect to the filing of
applicable returns, reports, documents and notices regarding any of the Benefit
Plans with the Secretary of Labor or the Secretary of the Treasury or the
furnishing of such notices or documents to the participants or beneficiaries of
the Benefit Plans which, either individually or in the aggregate, could result
in a material liability to Metamor or any of its Subsidiaries.

                                      1-10
<PAGE>

   (h) To the knowledge of Metamor, there are no pending legal proceedings
which have been asserted or instituted against any of the Benefit Plans or
their assets, Metamor, any of its Subsidiaries, any ERISA Affiliate, or the
plan administrator or any fiduciary of any of the Benefit Plans with respect to
the operation of such plans (other than routine, uncontested benefits claims).

   (i) Each of the Benefit Plans has been maintained, in all material respects,
in accordance with its terms and all provisions of applicable Laws. All
amendments and actions required to bring each of the Benefit Plans into
conformity in all material respects with all of the applicable provisions of
ERISA and other applicable Laws have been made or taken except to the extent
that such amendments or actions are not required by Law to be made or taken
until a date after the Closing Date.

   (j) Metamor, its Subsidiaries and their ERISA Affiliates do not maintain and
have no liability under a welfare benefit plan providing continuing benefits
after the termination of employment (other than as required by Section 4980B of
the Code and at the former employee's own expense). Except as set forth on the
Metamor Disclosure Schedule, Metamor, its Subsidiaries and each of their ERISA
Affiliates have complied in all material respects with the notice and
continuation requirements of Section 4980B of the Code and the regulations
thereunder. Other than money purchase pension plans, Metamor, its Subsidiaries
and their ERISA Affiliates do not maintain, sponsor or contribute to, and to
the knowledge of Metamor have never maintained, sponsored or contributed to,
any benefit plan subject to Title IV of ERISA, including but not limited to a
multiple employer plan subject to Sections 4063 and 4064 of ERISA or a
multiemployer plan as defined in Section 4001(a)(3) of ERISA.

   (k) Except as set forth on the Metamor Disclosure Schedule, neither the
execution and delivery of this Agreement nor the consummation of the
Transactions will (i) result in any material payment (including severance,
unemployment compensation or golden parachute) becoming due to any director,
employee or independent contractor of Metamor or its Subsidiaries, (ii)
materially increase any benefits otherwise payable under any Benefit Plan, or
(iii) result in the acceleration of the time of payment or vesting of any such
benefits to any material extent other than vesting of Metamor Options in
accordance with their terms.

   (l) Metamor and its Subsidiaries are in compliance in all material respects
with applicable Laws and collective bargaining agreements with respect to all
benefit plans, contracts and arrangements covering non-U.S. employees ("Non-
U.S. Benefit Plans"). Metamor and its Subsidiaries have no material unfunded
liabilities under any Metamor Non-U.S. Benefit Plan in violation of local Law
or that would, if the plan were covered by ERISA, violate the funding
obligations prescribed by ERISA. All benefits payable under each of the Non-
U.S. Benefit Plans are provided in accordance with the terms of the governing
provisions of the relevant Metamor Non-U.S. Benefit Plan. Metamor and its
Subsidiaries are not aware of any failure to comply with any applicable Law
which would or might result in the loss of tax approval or qualification of any
Non-U.S. Benefit Plans.

   (m) To the knowledge of Metamor, all individuals providing services to
Metamor, its Subsidiaries and their ERISA Affiliates have been properly
characterized and treated as being either an employee or an independent
contractor of such Person.

   Section 4.10 Labor Relations. There are no labor controversies pending or
threatened with respect to Metamor or its Subsidiaries, and neither Metamor nor
any of its U.S. Subsidiaries is a party to any collective bargaining agreement
with any labor union or other representative of employees. Except as set forth
in the Metamor Disclosure Schedule, no non-U.S. Subsidiary of Metamor is a
party to any collective bargaining agreement with any labor union or other
representative of employees or any works' council or similar entity under
applicable Laws. To the knowledge of Metamor, there is no pending or threatened
union organization activity by or among any of its or its Subsidiaries'
employees.

   Section 4.11 Taxes. Metamor and its Subsidiaries have duly filed all
material federal, state, local and foreign income, franchise, excise, real and
personal property and other Tax returns and reports (including, but

                                      1-11
<PAGE>

not limited to, those filed on a consolidated, combined or unitary basis)
required to have been filed by Metamor and its Subsidiaries prior to the date
hereof. All of the foregoing returns and reports are true and correct in all
material respects, and Metamor and its Subsidiaries have paid or, prior to the
Closing Date will pay, all Taxes shown on such returns or reports as being due.
Metamor and its Subsidiaries have paid and will pay all installments of
estimated taxes due on or before the Closing Date. Metamor and its Subsidiaries
have paid or made adequate provision in accordance with GAAP in the SEC
Reports, the Metamor Financial Statements, the Metamor Quarterly Financial
Statements and the Xpedior Financial Statements for all Taxes payable in
respect of all periods ending on or prior to the date of this Agreement and
will have paid or provided for all Taxes payable in respect of all periods
covered thereby. As of the date hereof, all deficiencies proposed as a result
of any audits have been paid or settled. Metamor and each of its Subsidiaries
has paid, collected or withheld, or caused to be paid, collected or withheld,
all amounts of Tax required to be paid, collected or withheld, other than such
Taxes for which adequate reserves in the SEC Reports, the Metamor Financial
Statements, the Metamor Quarterly Financial Statements or the Xpedior Financial
Statements have been established or which are being contested in good faith,
except as would not have a Metamor Material Adverse Effect. There are no claims
or assessments pending against Metamor or any of its Subsidiaries for any
alleged deficiency in any Tax, and neither Metamor nor any of its Subsidiaries
has been notified in writing of any proposed Tax claims or assessments against
Metamor or any Subsidiary. Neither Metamor nor any of its Subsidiaries has been
a member of a consolidated group filing a consolidated federal income Tax
return (other than a consolidated group of which Metamor is the common parent),
or has any liability for Taxes of any other Person (other than a member of the
Metamor consolidated group) arising from the application of Treasury
Regulations section 1.1502-6 promulgated under the Code or any analogous Law.
No consent under Section 341(f) of the Code has been filed with respect to
Metamor or any of its Subsidiaries. Except as set forth in the Metamor
Disclosure Schedule, there is no contract, agreement, plan or arrangement
covering any Person that, individually or collectively, could give rise to the
payment of any amount that would not be deductible by PSINet, Metamor, or any
of the Subsidiaries of Metamor by reason of Section 280G of the Code.

   Section 4.12 Compliance with Applicable Laws. Metamor and its Subsidiaries
hold all permits, licenses, variances, exemptions, orders and approvals of all
Governmental Entities (the "Metamor Permits") necessary for them to own, lease
or operate their properties and assets and to carry on their businesses
substantially as now conducted or presently intended to be conducted, except
for such permits, licenses, variances, exemptions, orders and approvals the
failure of which to hold would not have a Metamor Material Adverse Effect. The
Metamor Permits are valid and in full force and effect except as would not have
a Metamor Material Adverse Effect. Except as set forth in the SEC Reports filed
prior to the date hereof, the businesses of each of Metamor and its
Subsidiaries have not been, and are not being, conducted in violation of any
Metamor Permit or any Law, arbitration award, agency requirement, license or
permit of any Governmental Entity (a "Governmental Regulation"), except for
violations or possible violations that, individually or in the aggregate, are
not reasonably likely to have a Metamor Material Adverse Effect or prevent or
materially burden or materially impair the ability of Metamor to consummate the
Transactions. Except as set forth in the SEC Reports filed prior to the date
hereof, no material investigation or review by any Governmental Entity with
respect to Metamor or any of its Subsidiaries is pending or, to Metamor's
knowledge, threatened, nor has any Governmental Entity indicated an intention
to conduct any such investigation or review. No material change is required in
Metamor's or any of its Subsidiaries' operations, properties or procedures to
comply with any Metamor Permit or Governmental Regulation, and Metamor has not
received any notice or communication of any material noncompliance with any
Metamor Permit or Governmental Regulation that has not been cured as of the
date hereof, except as would not have a Metamor Material Adverse Effect.

   Section 4.13 Voting Requirements. The affirmative vote of the holders of a
majority of the Metamor Common Stock outstanding as of the record date for the
Metamor Special Meeting is the only vote of the holders of any class or series
of Metamor's capital stock or other securities necessary to adopt this
Agreement and the Transactions on behalf of Metamor.

   Section 4.14 Assets of Metamor and Its Subsidiaries. Metamor and each of its
Subsidiaries has good and defensible title to all of its material properties
and assets, free and clear of all liens, charges and

                                      1-12
<PAGE>

encumbrances, except liens for Taxes not yet due and payable and such liens or
other imperfections of title that do not individually or in the aggregate
constitute a Metamor Material Adverse Effect. All leases, easements, licenses,
rights of way, and other rights pursuant to which Metamor or any of its
Subsidiaries lease from others or otherwise have the right to use material real
or personal property, individually or in the aggregate material to the business
of Metamor (the "Metamor Property Rights"), are valid and binding and are in
full force and effect and enforceable against Metamor or its Subsidiaries and
the other parties thereto, as applicable, in accordance with their respective
terms and there is not, under any such Metamor Property Right, any existing
default or event of default (or event which with notice or lapse of time, or
both, would constitute a default or event of default), except where the lack of
such validity and effectiveness or the existence of such default or event of
default does not and will not constitute a Metamor Material Adverse Effect.
Metamor has made available to PSINet true and accurate copies of the documents
creating or reflecting the Metamor Property Rights. No consent of any Person is
needed in order for each Metamor Property Right to continue in full force and
effect in accordance with its terms without penalty, acceleration or rights of
early termination by reason of the consummation of the Transactions, except for
consents the absence of which would not have a Metamor Material Adverse Effect.
The tangible and intangible assets owned or leased by Metamor and its
Subsidiaries are all of the assets used in their respective businesses or
necessary for them to conduct their respective businesses as presently
conducted or presently intended to be conducted. All material items of tangible
property used by Metamor or its Subsidiaries in their businesses are in
operable condition and adequate for the purposes used (normal wear and tear
excepted).

   Section 4.15 Material Contracts. Neither Metamor nor any of its Subsidiaries
is a party or is subject to any contract, note, bond, mortgage, indenture,
credit agreement, lease, license, agreement, understanding, instrument, bid or
proposal (excluding any contract or arrangement that is or is associated with a
Benefit Plan), and any amendment or modification thereto (collectively,
"Contracts"), that is required to be described in or filed as an exhibit to any
Metamor SEC Report that is not so described in or filed as required by the
Securities Act or the Exchange Act, as the case may be. All Contracts to which
Metamor or any of its Subsidiaries is a party, or by which any of them is
bound, are valid and binding and are in full force and effect and enforceable
against Metamor, its Subsidiaries and, to the knowledge of Metamor, the other
party or parties thereto in accordance with their respective terms, and no
consent of any Person is needed in order for each such contract to continue in
full force and effect in accordance with its terms without penalty,
acceleration or rights of early termination by reason of the consummation of
the Transactions, except for any failure to be in full force and effect or
failure to obtain a consent that would not, in the aggregate with all other
such failures, have a Metamor Material Adverse Effect. Neither Metamor nor any
of its Subsidiaries is in violation or breach of or default in any material
respect under any Contract to which it is a party or by which it is bound, nor,
to Metamor's knowledge, is any other party to any such Contract in violation or
breach of or default in any material respect under any such Contract.

   Section 4.16 Intellectual Property.

   (a) Metamor and its Subsidiaries, directly or indirectly, own, license or
otherwise have legally enforceable rights to use, or can acquire on reasonable
terms and without material expense, all patents, trademarks, trade names,
service marks, copyrights and any applications therefor, technology, know-how,
computer software and applications and tangible or intangible proprietary
information or materials, that are material to and used in the business of
Metamor and its Subsidiaries as presently conducted (the "Intellectual Property
Rights").

   (b) In the case of Intellectual Property Rights owned by Metamor or one of
its Subsidiaries, either Metamor or one of its Subsidiaries owns such
Intellectual Property Rights free and clear of any material liens, charges or
encumbrances. Metamor or one of its Subsidiaries has an adequate right to the
use of the Intellectual Property Rights or the material covered thereby in
connection with the services or products in respect of which such Intellectual
Property Rights are being used. The manufacture, sale, licensing, or use of any
of the services or products of Metamor or any of its Subsidiaries as now
manufactured, sold, licensed or used or proposed for manufacture, sale,
licensing or use by Metamor or any of its Subsidiaries in the ordinary course
of Metamor's business as presently conducted does not infringe on any
copyright, patent, trade mark, service mark or trade

                                      1-13
<PAGE>

secret of a third party where such infringement would have a Metamor Material
Adverse Effect. The use by Metamor or any of its Subsidiaries of any
trademarks, service marks, trade names, trade secrets, copyrights, patents,
technology or know-how and applications used in the business of Metamor and any
of its Subsidiaries as presently conducted does not infringe on any other
Person's trademarks, service marks, trade names, trade secrets, copyrights,
patents, technology or know-how and applications where such infringement would
have a Metamor Material Adverse Effect. Except as set forth in the Metamor
Disclosure Schedule, Metamor has not received any information challenging the
ownership by Metamor or any of its Subsidiaries or the validity of any of the
Intellectual Property Rights. All registered patents, trademarks, service marks
and copyrights held by Metamor and its Subsidiaries are valid and subsisting,
except to the extent any failure to be valid and subsisting does not constitute
a Metamor Material Adverse Effect. To the knowledge of Metamor, there is no
material unauthorized use, infringement or misappropriation of any of the
Intellectual Property Rights by any third party, including any employee or
former employee of Metamor or any of its Subsidiaries. Metamor or one of its
Subsidiaries has valid, binding and enforceable agreements with each employee,
former employee and contractor who has or has had access to confidential or
proprietary intellectual property of Metamor or any of its Subsidiaries
pursuant to which such Person is required to maintain the confidentiality of
such information for a reasonable period of time or such agreements are not
necessary to adequately protect the interests of Metamor or such Subsidiary. No
Metamor Intellectual Property Right is subject to any known outstanding decree,
order, judgment, or stipulation restricting in any manner the licensing thereof
by Metamor or any of its Subsidiaries, except to the extent any such
restriction does not constitute a Metamor Material Adverse Effect.

   (c) The computer systems, software, hardware, firmware, middleware and other
information technology (collectively, "Information Technology") of Metamor and
its Subsidiaries are Year 2000 Ready except as would not have a Metamor
Material Adverse Effect, and none of Metamor nor any of its Subsidiaries has
experienced any material disruption in their Information Technology or in the
services and products provided to them by their vendors and suppliers as a
result of the occurrence of the year 2000. "Year 2000 Ready" means that
Information Technology is designed to be used prior to, during and after the
calendar year 2000 A.D. and such Information Technology will accurately
receive, provide and process date/time data (including calculating, comparing,
sequencing and making leap year calculations) from, into and between the
twentieth and twenty-first centuries A.D., and will not malfunction, cease to
function or provide invalid or incorrect results as a result of date/time data
(including to the extent that other Information Technology used in combination
with such Information Technology properly exchanges date/time data with it).

   Section 4.17 Interested Party Transactions. Since December 31, 1998, or as
described in the SEC Reports, no event has occurred that would be required to
be reported by Metamor or Xpedior pursuant to Item 404 of Regulation S-K
promulgated by the SEC. Except as expressly set forth in the SEC Reports or the
Metamor Disclosure Schedule, there are no material agreements, arrangements,
understandings or commitments (including Debt, guarantees, financial support or
keep whole arrangements) between or involving Metamor or any one or more of its
Subsidiaries (other than Xpedior and its Subsidiaries) on the one hand, and
Xpedior or any one or more of its Subsidiaries, on the other hand.

   Section 4.18 Environmental Matters. Except as disclosed on the Metamor
Disclosure Schedule or in the SEC Reports and excluding matters that would not
have a Metamor Material Adverse Effect:

   (a) Metamor and its Subsidiaries (i) are in compliance with all
Environmental Laws, and are not subject to any asserted liability or, to
Metamor's knowledge, any unasserted liability (including liability with respect
to current or former Subsidiaries or operations), under any Environmental Laws,
(ii) hold or have applied for all Environmental Permits required for their
properties or operations, and (iii) are in compliance with their respective
Environmental Permits;

   (b) none of Metamor nor any of its Subsidiaries has received any written
notice, demand, letter, claim or request for information alleging that Metamor
or any of its Subsidiaries is or may be in violation of, or liable under, any
Environmental Law;

                                      1-14
<PAGE>

   (c) none of Metamor nor any of its Subsidiaries (i) has entered into or
agreed to any consent decree or order or is subject to any judgment, decree or
judicial order relating to compliance with Environmental Laws, Environmental
Permits or the investigation, sampling, monitoring, treatment, remediation,
removal or cleanup of Hazardous Materials and, to the knowledge of Metamor and
the Subsidiaries, no investigation, litigation or other proceeding is pending
or threatened in writing with respect thereto, or (ii) has received written
notice asserting that it is an indemnitor in connection with any threatened or
asserted claim by any third-party indemnitee for any liability under any
Environmental Law or relating to any Hazardous Materials; and

   (d) none of the real property owned or leased by Metamor or any of its
Subsidiaries is listed on or, to the knowledge of Metamor, proposed for listing
on the "National Priorities List" under CERCLA, as updated through the date
hereof, or any similar state or foreign list of sites requiring investigation
or cleanup.

   For purposes of this Agreement:

   "CERCLA" means the Comprehensive Environmental Response, Compensation and
Liability Act of 1980, as amended as of the date hereof.

   "Environmental Laws" means any applicable federal, state, local, foreign or
supranational statute, Law, ordinance, regulation, rule, code, treaty, writ or
order and any enforceable judicial or administrative interpretation thereof,
including any judicial or administrative order, consent decree, judgment,
stipulation, injunction, permit, authorization, policy, opinion, or agency
requirement, in each case having the force and effect of Law, relating to the
pollution, protection, investigation or restoration of the environment, health
and safety or natural resources, including those relating to the use, handling,
presence, transportation, treatment, storage, disposal, release, threatened
release or discharge of Hazardous Materials or noise, odor, wetlands,
pollution, contamination or any injury or threat of injury to Persons or
property or to the siting, construction, operation, closure and post-closure
care of waste disposal, handling and transfer facilities.

   "Environmental Permits" means any permit, approval, identification number,
license or other authorization required under any Environmental Law.

   "Hazardous Materials" means (i) any petroleum, petroleum products, by-
products or breakdown products, radioactive materials, asbestos-containing
materials or polychlorinated biphenyls, or (ii) any chemical, material or other
substance defined or regulated as toxic or hazardous or as a pollutant or
contaminant or waste under any Environmental Law.

   Section 4.19 Restrictions on Business Activities. Except as set forth on the
Metamor Disclosure Schedule, there is no Contract, judgment, injunction, order
or decree binding upon Metamor or any of its Subsidiaries or any of their
properties which has had or could reasonably be expected to have the effect of
prohibiting or materially impairing (i) any material business practices of
Metamor, any of its Subsidiaries or, to the knowledge of Metamor or its
Subsidiaries, PSINet or its Affiliates, or (ii) the conduct of any material
business by Metamor, any of its Subsidiaries or, to the knowledge of Metamor or
its Subsidiaries, PSINet or its Affiliates, as currently conducted or as
proposed to be conducted by Metamor and its Subsidiaries.

   Section 4.20 Certain Business Practices. Neither Metamor nor any of its
Subsidiaries nor any director, officer, employee or agent of Metamor or any of
its Subsidiaries has in any material respect (i) used any funds for unlawful
contributions, gifts, entertainment or other unlawful payments relating to
political activity, (ii) made any unlawful payment to any foreign or domestic
government official or employee or to any foreign or domestic political party
or campaign or violated any provision of the Foreign Corrupt Practices Act of
1977, as amended, (iii) consummated any transaction, made any payment, entered
into any agreement or arrangement or taken any other action in violation of
Section 1128B(b) of the Social Security Act, as amended, or (iv) made any other
unlawful payment.

                                      1-15
<PAGE>

   Section 4.21 Insurance. Metamor has adequate insurance covering all of the
customarily insurable liabilities, including product liability, director and
officer liability, and general and casualty liabilities, with financially
secure insurers.

   Section 4.22 Brokers; Expenses. Except for Lazard Freres & Co. LLC
("Metamor's Fairness Opinion Advisor") and Donaldson, Lufkin & Jenrette
Securities Corporation whose fees shall be paid by Metamor, no agent, broker,
finder, investment banker or other firm or Person is or will be entitled to any
broker's or finder's fee or other similar commission or fee in connection with
the Transactions based upon arrangements made by or on behalf of Metamor.
Metamor has provided to PSINet a good faith estimate and description of the
expenses of Metamor and its Subsidiaries that Metamor expects to incur or has
incurred in connection with the Transactions.

   Section 4.23 Board Approval. The Board of Directors of Metamor by
resolutions duly adopted by unanimous vote of those voting at a meeting duly
called and held and not subsequently rescinded or modified in any way (the
"Metamor Board Approval"), has duly (i) determined that this Agreement and the
Merger are advisable, fair to and in the best interests of Metamor and its
stockholders, (ii) approved this Agreement and the Metamor Related Agreement
and the Merger, (iii) recommended that the stockholders of Metamor adopt this
Agreement and approve the Merger, and (iv) directed that this Agreement and the
Transactions be submitted for consideration by Metamor's stockholders at the
Metamor Special Meeting. The Metamor Board Approval constitutes approval of
this Agreement and the Merger for purposes of Section 203 of the Delaware Law
so that consummation of the Merger does not cause PSINet to become an
interested stockholder of Metamor for purposes of Section 203 of the Delaware
Law. To the knowledge of Metamor, except for Section 203 of the Delaware Law
(the restriction on business combinations of which has been rendered
inapplicable), no state takeover statute is applicable to the Merger or the
other Transactions. Xpedior has taken action to cause Section 203 of the
Delaware Law to be inapplicable to Xpedior. The consummation of the Merger will
not cause PSINet to become an interested stockholder of Xpedior for purposes of
Section 203 of the Delaware Law.

   Section 4.24 Opinion of Metamor's Fairness Opinion Advisor. Metamor has
received the opinion of Metamor's Fairness Opinion Advisor, dated the date of
this Agreement, to the effect that, as of such date, the Exchange Ratio is fair
to the holders of Metamor Common Stock from a financial point of view, a copy
of which opinion will be provided to PSINet.

                                   ARTICLE V

                    Representations and Warranties of PSINet

   PSINet represents and warrants to Metamor that, except as disclosed in the
PSINet Disclosure Schedule which has been delivered to Metamor prior to the
execution of this Agreement (the "PSINet Disclosure Schedule"):

   Section 5.1 Organization and Qualification. PSINet is a corporation duly
organized, validly existing and in good standing under the laws of the State of
New York, and Merger Subsidiary is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware. Each of
PSINet's Subsidiaries is duly organized, validly existing and in good standing
(to the extent such concept is applicable) in the jurisdiction of its formation
or organization. Each of PSINet and its Subsidiaries has the requisite
corporate power and authority to carry on its business as it is now being
conducted and is duly qualified or licensed to do business, and is in good
standing, in each jurisdiction where the character of its properties owned or
held under lease or the nature of its activities makes such qualification
necessary, except where the failure to be so qualified will not have a PSINet
Material Adverse Effect. PSINet has heretofore made available to Metamor a
complete and correct copy of the organizational documents, each as amended to
the date hereof, of PSINet and Merger Subsidiary.


                                      1-16
<PAGE>

   Section 5.2 Capitalization. As of the date of this Agreement, the authorized
capital stock of PSINet consists of 500,000,000 shares of PSINet Common Stock
and 30,000,000 shares of preferred stock, par value $.01 per share, of which
1,000,000 shares have been designated as Series A Junior Participating
Preferred Stock, 4,570,665 shares have been designated as 6 3/4% Series C
Cumulative Convertible Preferred Stock (the "PSINet Series C Preferred Stock")
and 16,500,000 shares have been designated as 7% Series D Cumulative
Convertible Preferred Stock (the "PSINet Series D Preferred Stock"). As of
March 20, 2000: (a) 164,341,575 shares of PSINet Common Stock were issued and
outstanding, all of which were validly issued, fully paid and non-assessable
subject to Section 630 of the New York Business Corporation Law, (b) 7,422,676
shares of PSINet Common Stock were held in the treasury of PSINet, (c) an
aggregate of 41,916,110 shares of PSINet Common Stock were reserved for
issuance under stock options issued pursuant to PSINet's employee and director
stock option plans (the "PSINet Stock Options"), (d) an aggregate of 100,000
shares of PSINet Common Stock were reserved for issuance pursuant to
outstanding warrants, and (e) 4,570,665 shares of PSINet Series C Preferred
Stock and 16,500,000 shares of PSINet Series D Preferred Stock were
outstanding, all of which were validly issued, fully paid and non-assessable
subject to Section 630 of the New York Business Corporation Law. Except as set
forth in this Section 5.2 and the PSINet Disclosure Schedule, there are no
options, warrants or other rights, agreements, arrangements or commitments of
any character relating to the issued or unissued capital stock of PSINet or
obligating PSINet to issue or sell any shares of capital stock of, or other
equity interests in, PSINet. All shares of capital stock of PSINet subject to
issuance pursuant to the PSINet Stock Options, upon issuance on the terms and
conditions specified in the instruments pursuant to which they are issuable,
will be duly authorized, validly issued, fully paid and non-assessable subject
to Section 630 of the New York Business Corporation Law.

   Section 5.3 Authority Relative to this Agreement. Each of PSINet and Merger
Subsidiary has all necessary power and authority to execute and deliver this
Agreement, to perform its obligations hereunder and to consummate the
Transactions to which each of them is a party. The execution and delivery of
this Agreement by PSINet and Merger Subsidiary and the consummation by PSINet
and Merger Subsidiary of the Transactions have been duly and validly authorized
by all necessary corporate action and no other corporate proceedings on the
part of PSINet or Merger Subsidiary are necessary to authorize the execution
and delivery of this Agreement or to consummate the Transactions other than,
with respect to the Merger, the approval of the issuance of the shares of
PSINet Common Stock as the Merger Consideration by the affirmative vote of the
holders of a majority of the total votes cast by holders of outstanding shares
of PSINet Common Stock entitled to be voted at the PSINet Special Meeting and
the filing and recordation of appropriate merger documents as required by
Delaware Law. This Agreement has been duly and validly executed and delivered
by PSINet and Merger Subsidiary and, assuming the due authorization, execution
and delivery hereof by the other parties hereto, constitutes a legal, valid and
binding obligation of PSINet and Merger Subsidiary, enforceable against PSINet
and Merger Subsidiary in accordance with its terms.

   Section 5.4 No Conflicts, Required Filings and Consents.

   (a) The execution and delivery of this Agreement by PSINet and Merger
Subsidiary does not, and the performance of this Agreement and consummation of
the Transactions by PSINet and Merger Subsidiary will not: (i) conflict with or
violate the certificate of incorporation or by-laws of PSINet and Merger
Subsidiary, (ii) assuming the consents, approvals, authorizations and waivers
specified in Section 5.4(b) have been received and the waiting periods referred
to therein have expired, and any condition precedent to such consent, approval,
authorization, or waiver has been satisfied, conflict with or violate any Laws
applicable to PSINet or its Subsidiaries or by which any property or asset of
PSINet or any of its Subsidiaries is bound or affected, or (iii) result in any
breach of or constitute a default (or an event which with notice or lapse of
time or both would become a default) under, or give to others any right of
termination, amendment, acceleration, or cancellation of, or result in the
creation of a lien or other encumbrance on any property or asset of PSINet or
any of its Subsidiaries pursuant to, any note, bond, mortgage, indenture or
credit agreement, or, to PSINet's knowledge as of the date of this Agreement,
any other contract, agreement, lease, license, permit, franchise or other
instrument or obligation to which PSINet or any of its Subsidiaries is a party
or by which PSINet or any of its Subsidiaries or any property or asset of
PSINet or any of its Subsidiaries is bound or affected, except in the

                                      1-17
<PAGE>

case of clauses (ii) or (iii) for any such conflicts, violations, breaches,
defaults or other occurrences of the type referred to above which would not
have a PSINet Material Adverse Effect or would not prevent or materially delay
the consummation of the Merger.

   (b) The execution and delivery of this Agreement by PSINet and Merger
Subsidiary does not, and the performance of this Agreement by PSINet and Merger
Subsidiary will not, require any consent, approval, authorization, waiver or
permit of, or filing with or notification to, any Governmental Entity, except
for applicable requirements of the Exchange Act, the Securities Act, Blue Sky
Laws, the HSR Act, such filings, filings, approvals, consents and waivers as
may be required under the Merger Control Laws, filing and recordation of the
Certificate of Merger as required by Delaware Law and applications for listing
and other filings required by the rules of the NASD National Market System and
except where failure to obtain such consents, approvals, authorizations or
permits, or to make such filings or notifications, would not have a PSINet
Material Adverse Effect or would not prevent or materially delay the
consummation of the Merger.

   Section 5.5 Reports and Financial Statements.

   (a) PSINet has filed with the SEC all forms, reports, schedules,
registration statements and definitive proxy statements (the "PSINet SEC
Reports") required to be filed by it with the SEC since January 1, 1998. As of
their respective dates, the PSINet SEC Reports complied as to form in all
material respects with the requirements of the Exchange Act or the Securities
Act, as the case may be, and the rules and regulations of the SEC thereunder
applicable to such PSINet SEC Reports. As of their respective dates and as of
the date any information from such PSINet SEC Reports has been incorporated by
reference, the PSINet SEC Reports did not contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading. PSINet has filed all material contracts
and agreements and other documents or instruments required to be filed as
exhibits to the PSINet SEC Reports.

   (b) The consolidated balance sheets of PSINet as of December 31, 1998, 1997
and 1996 and the related consolidated statements of operations, stockholders'
equity and cash flows for each of the three years in the three-year period
ended December 31, 1998 (including the related notes and schedules thereto)
contained in PSINet's Form 10-K for the year ended December 31, 1998 (the
"PSINet Financial Statements") present fairly, in all material respects, the
consolidated financial position and the consolidated results of operations,
retained earnings and cash flows of PSINet and its consolidated Subsidiaries as
of the dates or for the periods presented therein in conformity with GAAP
applied on a consistent basis during the periods involved except as otherwise
noted therein, including in the related notes.

   (c) The consolidated balance sheets and the related statements of operations
and cash flows (including, in each case, the related notes thereto) of PSINet
contained in the Form 10-Q for the quarterly period ended September 30, 1999
(the "PSINet Quarterly Financial Statements") have been prepared in accordance
with the requirements for interim financial statements contained in Regulation
S-X, which do not require all the information and footnotes necessary for a
fair presentation of financial position, results of operations and cash flows
in conformity with GAAP. The PSINet Quarterly Financial Statements reflect all
adjustments necessary to present fairly in accordance with GAAP (except as
indicated), in all material respects, the consolidated financial position,
results of operations and cash flows of PSINet and its consolidated
Subsidiaries for all periods presented therein.

   (d) Except for those liabilities that are fully reflected or reserved
against on the PSINet Financial Statements or the PSINet Quarterly Financial
Statements or as disclosed in the PSINet SEC Reports or as set forth in the
PSINet Disclosure Schedule, neither PSINet nor any of its Subsidiaries has
outstanding any liability of any nature whatsoever (whether absolute, accrued,
contingent, or otherwise and whether due or to become due) which would be
required to be reflected on a balance sheet or in the notes thereto prepared in
accordance with GAAP, except for (i) liabilities and obligations which have
been incurred since September 30, 1999 in the

                                      1-18
<PAGE>

ordinary course of business which are not material in nature or amount or (ii)
liabilities and obligations which individually or in the aggregate would not
have a PSINet Material Adverse Effect.

   Section 5.6 Information.

   (a) None of the information supplied or to be supplied by PSINet or Merger
Subsidiary for inclusion or incorporation by reference in the Joint Proxy
Statement/Prospectus will, at the time of filing with the SEC, at the time of
the mailing of the Joint Proxy Statement/Prospectus or any amendments or
supplements thereto to Metamor's and PSINet's stockholders or at the time of
the Metamor Special Meeting or the PSINet Special Meeting, contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein, in light
of the circumstances under which they are made, not misleading. The portion of
the Joint Proxy Statement/Prospectus based on information supplied by PSINet
and Merger Subsidiary for inclusion or incorporation by reference therein will
comply as to form in all material respects with the applicable provisions of
the Securities Act and the Exchange Act and the rules and regulations
thereunder.

   (b) As of the date of this Agreement, PSINet does not know of any reason (i)
why it would not be able to deliver to the respective counsel to PSINet and
Metamor, at the date of the legal opinions referred to below, certificates
substantially in compliance with published IRS advance ruling guidelines, with
customary exceptions and modifications thereto, to enable such firms to deliver
the legal opinions contemplated by Sections 8.2(c) and 8.3(c), or (ii) why
counsel to PSINet or Metamor would not be able to deliver the opinions required
by Sections 8.2(c) and 8.3(c).

   Section 5.7 Litigation. Except as disclosed in the PSINet SEC Reports, as of
the date hereof, there is no suit, action or proceeding pending or, to the
knowledge of PSINet, threatened against or affecting PSINet or any of its
Subsidiaries that is reasonably expected to have a PSINet Material Adverse
Effect, nor is there any judgment, decree, injunction or order of any
Governmental Entity or arbitrator outstanding against PSINet or its
Subsidiaries having, or which is reasonably expected to have, individually or
in the aggregate, a PSINet Material Adverse Effect.

   Section 5.8 Absence of Certain Changes or Events. Except as disclosed in the
PSINet SEC Reports, in the PSINet Financial Statements or PSINet Quarterly
Financial Statements, or on the PSINet Disclosure Schedule or as contemplated
by this Agreement, since September 30, 1999, PSINet has conducted its business
only in the ordinary course and in a manner consistent with past practice and,
since such date, there has not been any PSINet Material Adverse Effect.

   Section 5.9 Voting Requirements. The affirmative vote of the holders of at
least a majority of the total number of votes cast by the holders of the PSINet
Common Stock outstanding as of the record date for the PSINet Special Meeting
is the only vote of the holders of any class or series of PSINet's capital
stock or other securities necessary to approve this Agreement and the Merger.

   Section 5.10 Brokers. Except for FleetBoston Robertson Stephens Inc. and
Donaldson, Lufkin & Jenrette Securities Corporation whose fees shall be paid by
PSINet, no agent, broker, finder, investment banker or other firm or Person is
or will be entitled to any broker's or finder's fee or other similar commission
or fee in connection with the Transactions based upon arrangements made by or
on behalf of PSINet.

   Section 5.11 Ownership of Metamor Common Stock. PSINet and its Subsidiaries
do not own and, to PSINet's knowledge, have not owned at any time during the
past five years, any shares of Metamor Common Stock.

   Section 5.12 Board Approval. The Board of Directors of PSINet by resolutions
duly adopted by unanimous vote of those voting at a meeting duly called and
held and not subsequently rescinded or modified in any way (the "PSINet Board
Approval"), has duly (i) approved this Agreement and the issuance of

                                      1-19
<PAGE>

the PSINet Common Stock in the Merger, and (ii) recommended that the
stockholders of PSINet approve the issuance of the PSINet Common Stock in the
Merger.

                                   ARTICLE VI

                     Conduct of Business Pending The Merger

   Section 6.1 Conduct of Business by Metamor and its Subsidiaries Pending the
Merger.

   (a) From and after the date hereof until the Closing Date, except as
contemplated by this Agreement or unless PSINet shall otherwise agree in
writing, Metamor covenants and agrees that it shall, and shall cause its
Subsidiaries to: (i) carry on their respective businesses in the usual, regular
and ordinary course in substantially the same manner as heretofore conducted
and to use reasonable efforts to conduct their businesses in a manner
consistent with the budgets and plans heretofore made available to PSINet,
including all capital expenditure plans, (ii) use all reasonable efforts to
preserve intact their present business organizations, keep available the
services of their employees and consultants and preserve their relationships
and goodwill with customers, suppliers, licensors, licensees, distributors and
others having business dealings with them, and (iii) use commercially
reasonable efforts to protect the Intellectual Property Rights to the end that
its and its Subsidiaries' goodwill and on-going businesses shall not be
impaired in any material respect as of the Closing Date. Without limiting the
generality of the foregoing, except as expressly contemplated by this Agreement
or as set forth on EXHIBIT 6.1 or unless PSINet shall otherwise agree in
writing, prior to the Closing, Metamor shall not and shall not permit its
Subsidiaries to:

     (i) declare, set aside, or pay any dividends on, or make any other
  distributions in respect of, any of its capital stock, other than dividends
  and distributions by any direct or indirect Subsidiary of Metamor to its
  parent; split, combine or reclassify any of its capital stock or, other
  than pursuant to the exercise or conversion of Metamor Options, Xpedior
  Stock Options, Metamor Notes or other convertible securities outstanding on
  the date of this Agreement, issue or authorize the issuance of any other
  securities in respect of, in lieu of or in substitution for shares of its
  capital stock; purchase, redeem or otherwise acquire, other than pursuant
  to the exercise or conversion of Metamor Options, Xpedior Stock Options,
  Metamor Notes or other convertible securities outstanding on the date of
  this Agreement, any shares of capital stock of Metamor or any of its
  Subsidiaries or any other equity securities thereof or any rights,
  warrants, or options to acquire any such shares or other securities other
  than purchases, redemptions or acquisitions of equity securities of wholly-
  owned Subsidiaries of Metamor or rights, warrants or options to acquire
  such securities;

     (ii) grant, award or enter into any compensation or change of control
  arrangement with any employee of Metamor or any of its Subsidiaries;

     (iii) except for issuances of capital stock of a Subsidiary of Metamor
  to Metamor or a wholly-owned Subsidiary of Metamor, issue, deliver, sell,
  pledge, dispose of or otherwise encumber any shares of Metamor's or any of
  its Subsidiaries' capital stock including any Metamor Options, Xpedior
  Stock Options, Metamor Notes or other convertible securities, any other
  voting securities of Metamor or its Subsidiaries or any securities
  convertible into, or any rights, warrants or options to acquire, any such
  shares or voting securities (other than the issuance of Metamor Common
  Stock upon the exercise of Metamor Options, Metamor Notes or other
  convertible securities outstanding on the date of this Agreement or the
  issuance of Xpedior Common Stock upon the exercise or conversion of Xpedior
  Stock Options or other Xpedior convertible securities outstanding on the
  date of this Agreement) or amend the terms of any such securities, rights,
  warrants or options or take any action to accelerate the vesting thereof;

     (iv) amend the certificate of incorporation or by-laws of Metamor or any
  of its Subsidiaries;

     (v) acquire or agree to acquire by merging or consolidating with, or by
  purchasing a substantial portion of the assets of, or by any other manner,
  any business or any corporation, partnership, joint venture, association or
  other business organization or division thereof, or any assets that are
  material,

                                      1-20
<PAGE>

  individually or in the aggregate, to Metamor or any of its Subsidiaries,
  except, in any such case, in the ordinary course of business, and except
  transactions between a wholly-owned Subsidiary of Metamor and Metamor or
  another wholly-owned Subsidiary of Metamor;

     (vi) subject to a lien, charge or encumbrance or sell, lease, license or
  otherwise dispose of any of its material properties or assets or any
  Intellectual Property Rights, except in the ordinary course of business
  consistent with past practices and except transactions between a wholly-
  owned Subsidiary of Metamor and Metamor or another wholly-owned Subsidiary
  of Metamor, or adopt a plan of complete or partial liquidation;

     (vii) incur or modify any indebtedness for borrowed money or guarantee
  any such indebtedness of another Person; issue or sell any debt securities
  of Metamor or any of its Subsidiaries; guarantee any debt securities of
  another Person (other than indebtedness to, guarantees of, or issuances or
  sales to Metamor or a wholly-owned Subsidiary of Metamor); or enter into
  any "keep well" or other agreement to maintain any financial condition of
  another Person, except, in any such case, for borrowings or other
  transactions incurred in the ordinary course of business under existing
  credit facilities including the repayment of existing indebtedness pursuant
  to the terms thereof;

     (viii) except in the ordinary course of business, make any loans,
  advances or capital contributions to, or investments in, any other Person,
  other than to Metamor or any direct or indirect Subsidiary of Metamor or
  settle or compromise any material claims or litigation;

     (ix) alter, amend or delay in any material respect the implementation of
  its plans for capital expenditures;

     (x) take any action or omit to take any action that would result in
  Metamor owning less than eighty percent (80%) of the outstanding Xpedior
  Common Stock; or

     (xi) take any action or omit to take any action that would cause any of
  its representations and warranties herein to become untrue in any material
  respect; or

     (xii) authorize any of, or commit or agree to take any of, the foregoing
  actions.

   (b) Metamor shall promptly provide PSINet with copies of all filings made by
it or its Subsidiaries with any Governmental Entity in connection with this
Agreement and the Transactions contemplated hereby.

   (c) Metamor shall, before filing a material amended Tax return, changing any
material method of Tax accounting, or settling or compromising any material
litigation, claim, income Tax or other liability of Metamor or any of its
Subsidiaries, consult with PSINet and its advisors as to the positions and
elections that will be taken or made with respect to such matter and shall not
enter into any such settlement or compromise without the consent of PSINet.

   Section 6.2 Covenant of Buyer. From and after the date hereof until the
Closing Date, except as contemplated by this Agreement or unless Metamor shall
otherwise agree in writing, PSINet covenants and agrees that it shall not:

   (a) declare, set aside, or pay any dividends on, or make any other
distributions in respect of, any of its PSINet Common Stock, except such
dividends or distributions as would give rise to an adjustment pursuant to
Section 3.1(b);

   (b) enter into, or permit any of its Subsidiaries to enter into, any written
Contract (i) pursuant to which PSINet expressly agrees not to consummate the
Merger, (ii) which is otherwise conditioned upon the Merger not occurring, or
(iii) by its express terms would prohibit the Merger; or

   (c) take any action or omit to take any action that would cause any of its
representations and warranties herein to become untrue in any material respect.

                                      1-21
<PAGE>

   Section 6.3 Special Meetings. Metamor and PSINet shall each take all actions
necessary, in accordance with applicable Law and its respective certificate of
incorporation and by-laws, to convene a special meeting (the "Metamor Special
Meeting" and "PSINet Special Meeting," respectively) as promptly as reasonably
practicable after the date on which the Joint Proxy Statement/Prospectus have
been mailed to Metamor's stockholders for the purpose of considering and taking
action upon the Merger and this Agreement. Metamor and PSINet will hold the
Metamor Special Meeting and PSINet Special Meeting within 45 days after the
effective date of the Registration Statement. Subject to Section 7.8(b),
Metamor's board of directors shall recommend such approval and shall take all
lawful action to solicit and obtain such approval. PSINet's board of directors
shall recommend that its shareholders approve the issuance of the shares of
PSINet Common Stock in the Merger and shall take all lawful action to solicit
and obtain such approval.

   Section 6.4 Further Action; Consents; Filings.

   (a) Upon the terms and subject to the conditions hereof, each of the parties
hereto shall use its reasonable best efforts to take, or cause to be taken, all
appropriate actions and do, or cause to be done, all things necessary, proper
or advisable under applicable Law or otherwise to consummate and make effective
as promptly as practicable the Transactions and to cooperate with each other in
connection with the foregoing. Without limiting the generality of the
foregoing, each of the parties agrees to take all appropriate actions to obtain
from Governmental Entities any Governmental Authorizations required to be
obtained or made by PSINet, Metamor or any of their Subsidiaries in connection
with the authorization, execution and delivery of this Agreement and the
consummation of the Transactions, and to make all necessary filings, and
thereafter make any other required submissions that are required under (A) the
Exchange Act, the Securities Act or the Blue Sky Laws, (B) the HSR Act and any
other Merger Control Laws, and (C) any other applicable Law. The parties hereto
shall cooperate with each other in connection with the making of all such
filings, including by providing copies of all such documents to the nonfiling
party and its advisors prior to filing and, if requested, by accepting all
reasonable additions, deletions or changes suggested in connection therewith.

   (b) Each of PSINet and Metamor shall file, as soon as practicable after the
date of this Agreement but in no event more than ten business days after the
date of this Agreement, notifications under the HSR Act. PSINet and Metamor
shall, and shall cause their Subsidiaries who are required to do so to, file
any other applications or notices required under other Merger Control Laws,
shall respond as promptly as practicable to all inquiries or requests that may
be made pursuant to any Merger Control Laws for additional information or
documentation and shall respond as promptly as practicable to all inquiries and
requests received from any Governmental Entity in connection with antitrust
matters or matters relating to Metamor Permits. Each of PSINet and Metamor, to
the extent applicable, further agrees to file contemporaneously with the filing
of the applications any requests for waivers of applicable Governmental
Authorizations as may be available and to expeditiously prosecute such waiver
requests and diligently submit any additional information or amendments for
which any Governmental Entity may ask with respect to such waiver requests. The
parties shall cooperate with each other in connection with the making of all
such filings or responses, including providing copies of all such documents to
the other parties and its advisors prior to filing or responding.

   (c) Prior to the Closing Date, Metamor shall, and shall cause its
Subsidiaries to, use its reasonable best efforts to assist PSINet in its
integration of the acquisition of Metamor, including the prompt and orderly
transition of employees, customers and suppliers of Metamor's and its
Subsidiaries businesses and providing assistance to PSINet in connection with
the integration of Metamor's and its Subsidiaries lines of business and
services with those of PSINet.

   Section 6.5 Plan of Reorganization.

   (a) The Merger is intended to constitute a "plan of reorganization" under
the provisions of Sections 368(a)(1)(A) and 368(a)(2)(E) of the Code. From and
after the date of this Agreement and until the Closing, each party hereto shall
use its reasonable best efforts to cause the Merger to qualify, and will not
knowingly take any action, cause any action to be taken, fail to take any
action or cause any action to fail to be taken

                                      1-22
<PAGE>

which action or failure to act could prevent the Merger from qualifying as a
reorganization under the provisions of Section 368(a) of the Code. Following
the Closing, neither Surviving Corporation, PSINet nor any of their Affiliates
shall knowingly take any action, cause any action to be taken, fail to take any
action or cause any action to fail to be taken, which action or failure to act
could cause the Merger to fail to qualify as a reorganization under Section
368(a) of the Code.

   (b) Metamor and PSINet each hereby agrees to deliver certificates
substantially in compliance with IRS published advance ruling guidelines, with
customary exceptions and modifications thereto, to enable counsel to Metamor
and PSINet to deliver the legal opinions contemplated by Sections 8.2(c) and
8.3(c), which certificates shall be effective as of the date of such opinions.

   Section 6.6 Letters Of Accountants.

   (a) PSINet shall use its reasonable best efforts to cause to be delivered to
Metamor "comfort" letters of PricewaterhouseCoopers LLP, PSINet's independent
auditors, dated and delivered the date on which the Registration Statement
shall become effective and addressed to Metamor, in form and substance
reasonably satisfactory to Metamor and reasonably customary in scope and
substance for letters delivered by independent public accountants in connection
with transactions such as those contemplated by this Agreement.

   (b) Metamor shall use its reasonable best efforts to cause to be delivered
to PSINet "comfort" letters of Ernst & Young LLP, Metamor's independent
accountants, dated and delivered the date on which the Registration Statement
shall become effective and addressed to PSINet, in form and substance
reasonably satisfactory to PSINet and reasonably customary in scope and
substance for letters delivered by independent public accountants in connection
with transactions such as those contemplated by this Agreement.

   Section 6.7 Group Debt. PSINet will cooperate with Metamor to provide funds
for the payment of or satisfaction and discharge of all Group Debt at or prior
to Closing other than Metamor Notes that shall have been converted into Metamor
Common Stock in accordance with the terms of the Metamor Notes, and subject to
obtaining necessary funds from PSINet Metamor will cause the payment of or
satisfaction and discharge of all Group Debt effective as of the Effective Time
except to the extent that the failure to do so would not, either by itself or
with the giving of notice, passage of time or both, result in a breach of or
default under any agreement, instrument or indenture relating to Debt of PSINet
or any of its Subsidiaries.


                                  ARTICLE VII

                             Additional Agreements

   Section 7.1 Access to Information.

   (a) From the date hereof until the Closing or the earlier termination of
this Agreement in accordance with its terms, each of Metamor and its
Subsidiaries shall afford to PSINet and PSINet's accountants, counsel and other
representatives full and reasonable access during normal business hours (and at
such other times as the parties may mutually agree) to its properties, books,
contracts, commitments, records and personnel and, during such period, shall
furnish promptly to PSINet (i) a copy of each report, schedule and other
document filed or received by it pursuant to the requirements of the Exchange
Act and the Securities Act, and (ii) all other information concerning its
business, properties and personnel as PSINet may reasonably request, including
information regarding customers, suppliers and personnel and the opportunity to
meet with such Persons to discuss their business and relations with Metamor or
its Subsidiaries. Metamor and its Subsidiaries will permit PSINet full access
to the Intellectual Property Rights. PSINet shall conduct its review in a
manner reasonably calculated not to disrupt Metamor's or its Subsidiaries'
business and operations. PSINet shall hold, and shall cause its employees,
agents and representatives to hold, in confidence all "Confidential
Information" in accordance with the terms of the Nondisclosure Agreement, dated
March 10, 2000 between PSINet and

                                      1-23
<PAGE>

Metamor (the "Confidentiality Agreement"), which shall remain in full force and
effect in accordance with the terms thereof, including in the event of any
termination of this Agreement. No investigation pursuant to this Section 7.1(a)
shall limit any representation or warranty of Metamor.

   (b) From the date hereof until the Closing or the earlier termination of
this Agreement in accordance with its terms, PSINet shall afford to Metamor and
its accountants, counsel and other representatives full and reasonable access
during normal business hours (and at such other times as the parties may
mutually agree) to its properties, books, contracts, commitments, records and
personnel and, during such period, shall furnish promptly to Metamor (i) a copy
of each report, schedule and other document filed or received by it pursuant to
the requirements of the Exchange Act or the Securities Act, and (ii) all other
information concerning its business, properties and personnel as Metamor may
reasonably request, including information regarding customers, suppliers and
personnel and the opportunity to meet with such Persons to discuss their
business and relations with PSINet and its Subsidiaries. Metamor shall conduct
its review in a manner reasonably calculated not to disrupt PSINet's or its
Subsidiaries' business and operations. Metamor shall hold, and shall cause its
employees, agents and representatives to hold, in confidence all "Confidential
Information" in accordance with the terms of the Confidentiality Agreement,
which shall remain in full force and effect in accordance with the terms
thereof, including in the event of any termination of this Agreement. No
investigation pursuant to this Section 7.1(b) shall limit any representation or
warranty of PSINet.

   (c) As soon as practicable after the date hereof, Metamor shall use its best
efforts to cooperate and assist PSINet and PSINet's independent public
accountants in the compilation and preparation of all financial statements and
financial statement schedules of Metamor in accordance with GAAP and to obtain
such reports and consents of Metamor's independent public accountants as may be
necessary or deemed advisable by PSINet to comply with SEC reporting and
disclosure requirements. Metamor shall deliver to PSINet's independent public
accountants and/or Metamor's independent public accountants all engagement
letters and management representation letters as may be reasonably requested by
PSINet or such accountants. Metamor shall use its best efforts to cause its
independent public accountants to cooperate with and assist PSINet and its
independent public accountants in the preparation of the financial statements
contemplated by this Section 7.1(c).

   Section 7.2 Registration Statement; Joint Proxy Statement/Prospectus.

   (a) For the purposes of (i) registering the issuance of PSINet Common Stock
to holders of the shares of Metamor Common Stock in connection with the Merger
with the SEC under the Securities Act and complying with applicable Blue Sky
Laws and (ii) holding the Metamor Special Meeting and the PSINet Special
Meeting, PSINet and Metamor will cooperate in the preparation of a registration
statement on Form S-4 relating to the Merger (together with any and all
amendments and supplements to such registration statement, the "Registration
Statement"). The Registration Statement shall include a joint proxy
statement/prospectus satisfying all requirements of the Securities Act, the
Exchange Act and applicable Blue Sky Laws. Such joint proxy
statement/prospectus in the form mailed by Metamor and PSINet to their
respective stockholders, together with any and all amendments or supplements
thereto, are herein referred to as the "Joint Proxy Statement/Prospectus."

   (b) Metamor will furnish PSINet with such information concerning it and its
Subsidiaries as is necessary in order to cause the Joint Proxy
Statement/Prospectus, insofar as it relates to Metamor and its Subsidiaries, to
comply with applicable Law. Metamor agrees to promptly advise PSINet if, at any
time prior to the Metamor Special Meeting, any information provided by it in
the Joint Proxy Statement/Prospectus is or becomes incorrect or incomplete in
any material respect and to provide PSINet with the information needed to
correct such inaccuracy or omission. Metamor will furnish PSINet with such
supplemental information as may be necessary in order to cause the Joint Proxy
Statement/Prospectus, insofar as it relates to Metamor and its Subsidiaries, to
comply with applicable Law after the mailing thereof to the stockholders of
Metamor and PSINet.


                                      1-24
<PAGE>

   (c) PSINet will include in the Joint Proxy Statement/Prospectus such
information concerning PSINet and its Subsidiaries as is necessary in order to
cause such Joint Proxy Statement/Prospectus, insofar as it relates to PSINet
and its Subsidiaries, to comply with applicable Law. If, at any time prior to
the Metamor Special Meeting, any information included or incorporated by
reference by PSINet in the Joint Proxy Statement/Prospectus is or becomes
incorrect or incomplete in any material respect, PSINet shall correct such
inaccuracy or omission. PSINet will furnish such supplemental information as
may be necessary in order to cause the Joint Proxy Statement/Prospectus,
insofar as it relates to PSINet and its Subsidiaries, to comply with applicable
Law after the mailing thereof to the stockholders of Metamor and PSINet.

   (d) Metamor and PSINet agree to cooperate in making any preliminary filings
of the Joint Proxy Statement/Prospectus with the SEC, as promptly as
practicable, pursuant to Rule 14a-6 under the Securities Exchange Act, and
shall cooperate in responding to any comments with respect thereto received
from the SEC.

   (e) PSINet will file the Registration Statement with the SEC and appropriate
materials with applicable state securities agencies as promptly as practicable
and will use all reasonable efforts to cause the Registration Statement to
become effective under the Securities Act and all such state filed materials to
comply with applicable Blue Sky Laws. Metamor authorizes PSINet to utilize in
the Registration Statement and the Joint Proxy Statement/Prospectus and all
such state filed materials, the information concerning Metamor and its
Subsidiaries provided to PSINet in connection with, or contained or
incorporated by reference in, the Joint Proxy Statement/Prospectus. PSINet will
promptly advise Metamor when the Registration Statement has become effective
and of any supplements or amendments thereto, and PSINet will furnish Metamor
with copies of all such documents. Except for the Joint Proxy
Statement/Prospectus or the preliminary joint proxy statement/prospectus,
neither PSINet nor Metamor shall distribute any written material that might
constitute a "prospectus" relating to the Merger within the meaning of the
Securities Act or any applicable state securities Law without the prior written
consent of the other.

   (f) Each of Metamor and PSINet shall mail the Joint Proxy
Statement/Prospectus to its stockholders as promptly as practicable after the
date the Registration Statement is declared effective under the Securities Act.

   Section. 7.3 Employee Retention. Metamor and PSINet shall consult with each
other promptly after the date of this Agreement on the design and
implementation of retention arrangements and non-competition agreements to
retain key employees of Metamor and its Subsidiaries. Each of Metamor and
PSINet will act in good faith to implement the arrangements agreed upon and to
encourage the retention of such key employees, and Metamor hereby waives any
claim that it may have against PSINet, its Affiliates or such employees
resulting from any employment negotiations which they may undertake. PSINet
further agrees to cooperate in good faith to assist Metamor in complying with
its agreements under Section 6.1(a)(ii).

   Section 7.4 Public Announcements. On or before the Closing Date, neither
PSINet nor Metamor shall (nor shall they permit any of their respective
Affiliates to), without prior consultation with the other parties and such
other parties' review of and consent to any public announcement concerning the
Transactions, issue any press release or make any public announcement with
respect to Transactions during such period, and PSINet and Metamor shall, to
the extent practicable, allow the other parties reasonable time to review and
comment on such release or announcement in advance of its issuance and use
reasonable efforts in good faith to reflect the reasonable and good faith
comments of such other party; provided, however, no party shall be prevented
from making any disclosure required by Law at the time so required because of
any delay on the part of another party. The parties intend that the initial
announcement of the terms of the Transactions shall be made by a joint press
release of PSINet and Metamor.

   Section 7.5 Indemnification of Metamor's Directors and Officers and
Insurance.

   (a) To the extent, if any, not provided by an existing right of
indemnification or other agreement or policy, from and after the Effective
Time, PSINet shall, to the extent not permitted by applicable Law, indemnify,
defend and hold harmless the present and former directors, officers and
management employees of

                                      1-25
<PAGE>

Metamor and its Subsidiaries, other than a Person in his or her capacity as a
director, officer or management employee of Xpedior and its Subsidiaries unless
such Person is also a director, officer or management employee of Metamor who
so served as a director, officer or employee of Xpedior at the request of
Metamor (each, an "Indemnified Party" and, collectively, the "Indemnified
Parties"), against (i) all losses, expenses (including reasonable attorneys'
fees and expenses), claims, damages, costs, liabilities, judgments or (subject
to the proviso of the next succeeding sentence) amounts that are paid in
settlement of or in connection with any claim, action, suit, proceeding or
investigation based in whole or in part on or arising in whole or in part out
of the fact that such person is or was a director, officer or management
employee of Metamor or applicable Subsidiaries, whether pertaining to any
matter existing or occurring at or prior to the Effective Time and whether
asserted or claimed prior to, at or after the Effective Time, and (ii) all
liabilities based in whole or in part on, or arising in whole or in part out
of, or pertaining to this Agreement or the Transactions. In the event of any
such loss, expense, claim, damage, cost, liability, judgment or settlement
(whether or not incurred before the Effective Time), (x) the PSINet shall pay
the reasonable fees and expenses of counsel selected by the Indemnified
Parties, which counsel shall be reasonably satisfactory to the PSINet, promptly
after statements therefor are received, and otherwise advance to the
Indemnified Parties upon request reimbursement of documented expenses
reasonably incurred, in either case to the extent not prohibited by applicable
Law, (y) PSINet shall cooperate in the defense of any such matter, and (z) any
determination required to be made with respect to whether an Indemnified
Party's conduct complies with the standards under applicable Law or as set
forth in PSINet's certificate of incorporation or bylaws shall be made by
independent counsel mutually acceptable to PSINet and the Indemnified Party;
provided, however, that PSINet shall not be liable for any settlement effected
without its written consent (which consent shall not be unreasonably withheld
or delayed). The Indemnified Parties as a group may retain only one law firm
(other than local counsel) with respect to each related matter except to the
extent there is, in the sole opinion of counsel to an Indemnified Party, under
applicable standards of professional conduct, a conflict on any significant
issue between positions of any two or more Indemnified Parties, in which case
each Indemnified Party with a conflicting position on a significant issue shall
be entitled to separate counsel. In the event any Indemnified Party is required
to bring any action to enforce rights or to collect moneys due under this
Agreement and is successful in such action, PSINet shall reimburse such
Indemnified Party for all of its expenses in bringing and pursuing such action.
Each Indemnified Party shall be entitled to the advancement of expenses to the
full extent contemplated in this Section 7.5(a) in connection with any such
action. The rights of Indemnified Parties to indemnification and advancement
and reimbursement of expenses for matters arising after the Effective Time
shall be governed by the certificate of incorporation and by-laws of the
Surviving Corporation and Metamor's Subsidiaries and any applicable agreements
or other arrangements.

   (b) The Surviving Corporation shall cause to be maintained in effect for a
period of three years, the current policies of directors' and officers'
liability insurance and fiduciary liability insurance maintained by Metamor
(provided that the Surviving Corporation may substitute therefor policies of at
least the same coverage and amounts containing terms and conditions which are,
in the aggregate, no less advantageous to the insured) with respect to claims
arising from facts or events that occurred on or before the Effective Time;
provided, however, that in no event shall the Surviving Corporation be required
to expend in any one year an amount in excess of 200% of the annual premiums
currently paid by Metamor for such insurance; and, provided, further, that if
the annual premiums of such insurance coverage exceed such amount, the
Surviving Corporation shall be obligated to obtain a policy with the greatest
coverage available for a cost not exceeding such amount.

   (c) In the event the PSINet or any of its successors or assigns (i)
consolidates with or merges into any other person and shall not be the
continuing or surviving corporation or entity of such consolidation or merger,
or (ii) transfers all or substantially all of its properties and assets to any
person, then and in either such case, proper provision shall be made so that
the successors and assigns of the PSINet shall assume the obligations set forth
in this Section 7.5.

   (d) To the extent not prohibited by Law, from and after the Effective Time,
all rights to indemnification now existing in favor of the employees, agents,
directors or officers of Metamor and its Subsidiaries with

                                      1-26
<PAGE>

respect to their activities as such prior to or at the Effective Time, as
provided in their respective certificates of incorporation or bylaws or
indemnification agreements in effect on the date of such activities or
otherwise in effect on the date hereof, shall survive the Merger and shall
continue in full force and effect for a period of not less than six years from
the Effective Time, provided that, in the event any claim or claims are
asserted or made within such six year period, all such rights to
indemnification in respect of any claim or claims shall continue until final
disposition of such claim or claims and provided further that nothing in this
Section 7.5 shall preclude any amendment or termination of such rights with
respect to activities after the Effective Time.

   Section 7.6 Notice of Breaches. Metamor shall give prompt notice to PSINet,
and PSINet shall give prompt notice to Metamor, of (i) any representation or
warranty made by it contained in this Agreement which has become untrue or
inaccurate in any material respect, or (ii) the failure by it to comply with or
satisfy in any material respect any covenant, condition, or agreement to be
complied with or satisfied by it under this Agreement; provided, however, that
such notification shall not excuse or otherwise affect the representations,
warranties, covenants or agreements of the parties or the conditions to the
obligations of the parties under this Agreement.

   Section 7.7 Transfer and Gains Taxes and Certain Other Taxes and
Expenses. PSINet agrees that the Surviving Corporation will pay all real
property transfer, gains and other similar taxes and all documentary stamps,
filing fees, recording fees and sales and use taxes, if any, and any penalties
or interest with respect thereto, payable in connection with consummation of
the Merger without any offset, deduction, counterclaim or deferment of the
payment of the Merger Consideration. Metamor shall update its good faith
estimate and description of the expenses of Metamor and its Subsidiaries that
they expect to incur or have incurred in connection with the Transactions not
fewer than five days prior to the Closing Date and at such other times as may
be reasonably requested by PSINet.

   Section 7.8 Acquisition Proposals.

   (a) Metamor agrees that it shall not nor shall any of its Subsidiaries or
any of its or its Subsidiaries' officers, directors, employees, agents and
representatives (including any investment banker, attorney or accountant
retained by it or any of its Subsidiaries), directly or indirectly, initiate,
solicit, induce, encourage or knowingly facilitate (including by way of
furnishing information) any inquiries or the making of any proposal or offer
with respect to a merger, reorganization, share exchange, consolidation,
business combination, recapitalization, liquidation, dissolution or similar
transaction involving, or any purchase or sale of all or any significant
portion of the assets of Metamor or more than 10% of the Metamor Common Stock
or the assets or capital stock of any of its Subsidiaries (any such proposal or
offer (other than a proposal or offer made by PSINet or an Affiliate thereof)
being hereinafter referred to as an "Acquisition Proposal"). Metamor further
agrees that neither it nor any of its Subsidiaries nor any of its or its
Subsidiaries' officers or directors shall, and that it shall direct and use its
reasonable best efforts to cause its and its Subsidiaries' employees, agents
and representatives (including any investment banker, attorney or accountant
retained by it or any of its Subsidiaries) not to, directly or indirectly, have
any discussion with or provide any confidential information or data to any
Person relating to an Acquisition Proposal, or engage in any negotiations
concerning an Acquisition Proposal, or knowingly facilitate any effort or
attempt to make or implement an Acquisition Proposal or accept an Acquisition
Proposal. Notwithstanding the foregoing, Metamor and its Board of Directors
shall be permitted to comply with Rule 14e-2 promulgated under the Exchange Act
with regard to an Acquisition Proposal or in response to an unsolicited bona
fide written Acquisition Proposal by any Person, to engage in any discussions
or negotiations with, or provide any information to, any Person in response to
an unsolicited bona fide written Acquisition Proposal by any such Person, if
and only to the extent that: (i) the Metamor Special Meeting shall not have
occurred; (ii) the Board of Directors of Metamor, following consultation with
Metamor's financial advisors, concludes in good faith that such Acquisition
Proposal could reasonably be expected to result in a Superior Proposal; (iii)
prior to providing any information or data to any Person in connection with an
Acquisition Proposal by any such Person, the Metamor Board of Directors
receives from such Person an executed confidentiality agreement on terms
substantially similar to those contained in the Confidentiality Agreement
(including the standstill provisions contained therein, unless Metamor shall
have amended the

                                      1-27
<PAGE>

Confidentiality Agreement to modify the standstill provisions therein to be no
more restrictive of PSINet than such Person is restricted pursuant to such
confidentiality agreement); and (iv) at least one day prior to providing any
information or data to any Person or entering into discussions or negotiations
with any Person, the Board of Directors of Metamor notifies PSINet promptly of
such inquiries, proposals or offers received by, any such information requested
from, or any such discussions or negotiations sought to be initiated or
continued with, any of its representatives indicating, in connection with such
notice, the material terms and conditions of any proposals or offers other than
the name of such Person. Metamor agrees that it will keep PSINet informed, on a
current basis, of the status and terms of any Acquisition Proposals and the
status of any such discussions or negotiations. Metamor agrees that it will
immediately cease and cause to be terminated any existing activities,
discussions or negotiations with any Persons conducted heretofore with respect
to any Acquisition Proposal and, to the fullest extent permitted by any
confidentiality or non-disclosure agreements with such Persons, use
commercially reasonable efforts to enforce the right to recover or cause to be
destroyed all information regarding Metamor or its Subsidiaries in the
possession of such Persons and their respective Affiliates, representatives and
advisors. Metamor agrees that it will take the necessary steps to promptly
inform the individuals or entities referred to in the first sentence of this
Section 7.8(a) of the obligations undertaken in this Section 7.8(a) and that
any breach of the provisions of this Section 7.8(a) by any officer or director
of Metamor or its Subsidiaries or any investment banker, financial advisor,
attorney, accountant or other representative of Metamor or its Subsidiaries
will be deemed a breach by Metamor.

   (b) Except as permitted in this Section 7.8(b), neither the Board of
Directors of Metamor nor any committee thereof shall (i) withdraw or modify, or
propose publicly to withdraw or modify, in a manner adverse to PSINet, or take
any action not explicitly permitted by this Agreement that would be
inconsistent with, the approval or recommendation by such Board of Directors or
such committee of the Transactions, (ii) approve or recommend, or propose
publicly to approve or recommend, any Acquisition Proposal, or (iii) cause
Metamor to enter into any letter of intent, agreement in principle, acquisition
agreement or other similar agreement (each, an "Acquisition Agreement") related
to any Acquisition Proposal. Notwithstanding the foregoing, in the event that
prior to the vote on the Merger at the Metamor Special Meeting, the Board of
Directors of Metamor determines in good faith, that an Acquisition Proposal
constitutes a Superior Proposal, the Board of Directors of Metamor may (x)
withdraw or modify its approval or recommendation of the Merger in connection
with the Metamor Special Meeting, (y) approve or recommend a Superior Proposal
and (z) if it so chooses, cause Metamor to enter into an Acquisition Agreement
with respect to such Superior Proposal but, in each of the cases, only if: (A)
three (3) days have elapsed following PSINet's receipt of written notice from
Metamor advising PSINet that the Board of Directors of Metamor has received a
Superior Proposal, specifying the material terms and conditions of such
Superior Proposal, identifying the Person making such Superior Proposal, and
advising PSINet that the Board of Directors of Metamor has determined that it
will no longer recommend approval of the Merger; (B) Metamor has paid the
Termination Fee to PSINet; and (C) Metamor has terminated this Agreement in
accordance with its terms. During the three-day period referred to in clause
(A) of the immediately preceding sentence, PSINet shall not enter into an
agreement with the Person making the Superior Proposal concerning an
Acquisition Proposal with regard to Metamor.

   Section 7.9 Metamor Related Agreement and PSINet Related
Agreement. Simultaneously with the execution and delivery of this Agreement and
as material consideration for the execution and delivery of this Agreement by
PSINet and Merger Subsidiary, Peter T. Dameris is entering into the Metamor
Related Agreement pursuant to which he, among other things, agrees to vote the
shares of Metamor Common Stock owned by him in favor of the Merger at the
Metamor Special Meeting. Simultaneously with the execution and delivery of this
Agreement and as material consideration for the execution and delivery of this
Agreement by Metamor, William L. Schrader is entering into the PSINet Related
Agreement pursuant to which he, among other things, agrees to vote the shares
of PSINet Common Stock owned by him in favor of the issuance of the shares of
PSINet Common Stock in the Merger.

   Section 7.10 Employee Benefits.

   (a) As of the Effective Time, PSINet shall cause the employees of Metamor
and its Subsidiaries other than Xpedior and its Subsidiaries (collectively, the
"Metamor Employees") to be covered under the

                                      1-28
<PAGE>

PSINet's "employee benefit plans" as defined in ERISA ("PSINet Benefit Plans")
and for at least two years after the Effective Time, PSINet shall, or shall
cause the Surviving Corporation to, provide benefits, in the aggregate, that
are no less favorable than the benefits provided, in the aggregate, to the
Metamor Employees under the Benefit Plans of Metamor immediately prior to the
Effective Time. Notwithstanding the foregoing, except as specifically provided
in this Agreement, nothing herein shall require: (i) the continuation of any
Benefit Plan or prevent the amendment or termination thereof (subject to the
maintenance, in the aggregate, of the benefits as provided in the preceding
sentence); or (ii) require PSINet or the Surviving Corporation to continue or
maintain any stock purchase or other equity plan related to the equity of
Metamor or the Surviving Corporation or to change the eligibility requirements
of any stock or other equity plan of PSINet; or (iii) constitute any obligation
on the part of PSINet, the Surviving Corporation or any of their Affiliates to
change the employment status of any of the Metamor Employees to other than "at
will."

   (b) With respect to any PSINet Benefit Plans in which the Metamor Employees
participate, PSINet shall, or shall cause the Surviving Corporation to, to the
extent permitted under the PSINet Benefits Plans: (i) not impose any
limitations more onerous than those currently in effect as to pre-existing
conditions, exclusions and waiting periods with respect to participation and
coverage requirements applicable to the Metamor Employees under which any
welfare benefit plan in which such employees may be eligible to participate
after the Effective Time, (ii) provide each Metamor Employee with credit for
any co-payments and deductibles paid prior to the Effective Time in satisfying
any applicable deductible or out-of-pocket requirements under any welfare
benefit plan in which such employees may be eligible to participate after the
Effective Time, and (iii) recognize all service of each Metamor Employee with
Metamor for all purposes (including purposes of eligibility to participate,
vesting credit, entitlement for benefits and benefit accrual) in any benefit
plan in which such employees may be eligible to participate after the Effective
Time, to the same extent taken into account under a comparable Benefit Plan
immediately prior to the Closing Date.

   Section 7.11 Nasdaq Listing and Delisting. PSINet shall promptly prepare and
submit to the Nasdaq National Market System a listing application covering the
PSINet Common Stock to be issued in the Merger and upon exercise of the Assumed
Metamor Options, and shall use its reasonable efforts to obtain, prior to the
Closing Date, approval for the listing of such PSINet Common Shares, subject to
official notice of issuance, and Metamor shall cooperate with PSINet with
respect to such listing, which cooperation shall include, but not be limited
to, taking all necessary actions to delist the Metamor Common Stock from the
Nasdaq National Market System effective after the Effective Time.

                                  ARTICLE VIII

                              Conditions Precedent

   Section 8.1 Conditions to Each Party's Obligation to Effect the Merger. The
respective obligations of each party to effect the Merger shall be subject to
the fulfillment at or prior to the Effective Time of the following conditions:

   (a) This Agreement and the Merger shall have been approved and adopted by
the requisite vote of the holders of Metamor Common Stock at the Metamor
Special Meeting in the manner required by Law and the issuance of the shares of
PSINet Common Stock in the Merger shall have been approved and adopted by the
requisite vote of the holders of PSINet Common Stock at the PSINet Special
Meeting in accordance with applicable Law and the Rules of the Nasdaq National
Market System.

   (b) The waiting period applicable to the consummation of the Merger under
the HSR Act and other applicable Merger Control Laws shall have expired or been
terminated and any material consents from third parties listed on EXHIBIT
8.1(B) hereto which are required to be received prior to the Closing Date with
respect to the Transactions shall have been received.


                                      1-29
<PAGE>

   (c) The shares of PSINet Common Stock to be issued in the Merger and upon
exercise of the Metamor Assumed Options and such other shares to be reserved
for issuance in connection with the Merger shall have been approved for listing
on the Nasdaq National Market System upon official notice of issuance.

   (d) The Registration Statement shall have been declared effective by the SEC
under the Securities Act, no stop order suspending the effectiveness of the
Registration Statement shall have been issued by the SEC, and no proceedings
for that purpose shall have been initiated or threatened by the SEC.

   (e) The consummation of the Merger shall not be restrained, enjoined or
prohibited by any order, judgment, decree, injunction or ruling of a court of
competent jurisdiction.

   Section 8.2 Conditions to Obligation of Metamor to Effect the Merger. The
obligation of Metamor to effect the Merger shall be subject to the fulfillment
at or before the Effective Time of the following additional conditions, unless
waived by Metamor:

   (a) The representations and warranties of PSINet contained in this Agreement
shall be true and correct in all respects on the date hereof and as of the
Closing Date as if made on the Closing Date; provided, however, (i) this
condition shall be deemed to be satisfied if (A) all inaccuracies in the
representations and warranties of PSINet (other than those set forth in
Sections 5.1 through 5.3), without taking into account any qualifications as to
materiality or PSINet Material Adverse Effect, in the aggregate, do not
constitute a PSINet Material Adverse Effect, and (B) the representations and
warranties set forth in Sections 5.1 through 5.3 are true and correct in all
material respects; and (ii) that such representations and warranties which are
made as of a specific date need only be true as of such date. Metamor shall
have received a certificate of an authorized officer of PSINet, on behalf of
PSINet, to such effect.

   (b) PSINet and Merger Subsidiary shall have performed or complied in all
material respects with all agreements and covenants required to be performed by
each of them under this Agreement on or before the Closing Date, and Metamor
shall have received a certificate of an authorized officer of PSINet and Merger
Subsidiary, on behalf of PSINet and Merger Subsidiary, to such effect.

   (c) Metamor shall have received from Vinson & Elkins, LLP, counsel to
Metamor, at or prior to the date of mailing of the Joint Proxy
Statement/Prospectus and on the Closing Date, a written opinion dated as of
such date, based on appropriate representations, including representations of
PSINet and Metamor, that the Merger qualifies as a reorganization within the
meaning of Section 368(a) of the Code; provided, however, in the event that
counsel to Metamor is unwilling to render such opinion this condition shall be
satisfied if counsel to PSINet renders such an opinion that is reasonably
satisfactory to Metamor.

   Section 8.3 Conditions to Obligations of PSINet and Merger Subsidiary to
Effect the Merger. The obligations of PSINet and Merger Subsidiary to effect
the Merger shall be subject to the fulfillment at or before the Effective Time
of the following additional conditions, unless waived by PSINet:

   (a) The representations and warranties of Metamor contained in this
Agreement shall be true and correct in all respects on the date hereof and as
of the Closing Date as if made on the Closing Date; provided, however, (i) this
condition shall be deemed to be satisfied if (A) all inaccuracies in the
representations and warranties of Metamor (other than those set forth in
Sections 4.1 through 4.3), without taking into account any qualifications as to
materiality or Metamor Material Adverse Effect, in the aggregate, do not
constitute a Metamor Material Adverse Effect, and (B) the representations and
warranties set forth in Sections 4.1 through 4.3 are true and correct in all
material respects; and (ii) that such representations and warranties which are
made as of a specific date need only be true as of such date. PSINet shall have
received a certificate of an authorized officer of Metamor, on behalf of
Metamor, to such effect.

   (b) Metamor shall have performed or complied in all material respects with
all agreements and covenants required to be performed by it under this
Agreement on or before the Closing Date and PSINet shall have received a
certificate of an authorized officer of Metamor, on behalf of Metamor, to such
effect.

                                      1-30
<PAGE>

   (c) PSINet shall have received from Nixon Peabody LLP, counsel to PSINet, on
the Closing Date, a written opinion dated as of such date, based on appropriate
representations, including representations of PSINet and Metamor, that the
Merger qualifies as a reorganization within the meaning of Section 368(a) of
the Code; provided, however, in the event that counsel to PSINet is unwilling
to render such opinion this condition shall be satisfied if counsel to Metamor
renders such an opinion that is reasonably satisfactory to PSINet.

   (d) Provided that PSINet shall have made funds available therefor, the Group
Debt shall have been paid or satisfied and discharged except to the extent that
the failure to do so would not, either by itself or with the giving of notice,
passage of time or both, result in a breach of or default under any agreement,
instrument or indenture relating to Debt of PSINet or any of its Subsidiaries.

                                   ARTICLE IX

                       Termination, Amendment and Waiver

   Section 9.1 Termination. This Agreement may be terminated at any time prior
to the Effective Time, whether before or after approval by the stockholders of
Metamor:

   (a) by mutual written consent of PSINet and Metamor;

   (b) by Metamor, upon a material breach of this Agreement on the part of
PSINet or Merger Subsidiary which has not been cured and which would cause the
condition set forth in Section 8.2 to be incapable of being satisfied by
October 31, 2000;

   (c) by PSINet, upon a material breach of this Agreement on the part of
Metamor which has not been cured and which would cause the conditions set forth
in Section 8.3 to be incapable of being satisfied by October 31, 2000;

   (d) by PSINet or Metamor if any court of competent jurisdiction shall have
issued, enacted, entered, promulgated or enforced any order, judgment, decree,
injunction or ruling which, after reasonable efforts on the part of PSINet and
Metamor to resist, resolve or lift, permanently restrains, enjoins or otherwise
prohibits the Merger and such order, judgment, decree, injunction or ruling
shall have become final and nonappealable;

   (e) by PSINet or Metamor if the Merger shall not have been consummated on or
before October 31, 2000 provided that the right to terminate this Agreement
under this Section 9.1(e) shall not be available to any party whose failure to
perform any material covenant or obligation under this Agreement has been the
cause of or resulted in the failure of the Merger to occur on or before such
date;

   (f) by PSINet or Metamor if the Metamor Special Meeting or the PSINet
Special Meeting (as any of them may be adjourned from time to time) shall have
concluded without Metamor or PSINet, as the case may be, having obtained the
required stockholder approval;

   (g) by PSINet if the Board of Directors of Metamor, prior to the Metamor
Special Meeting (i) shall withdraw or modify in any adverse manner the Metamor
Board Approval, or (ii) shall approve or recommend a Superior Proposal pursuant
to Section 7.8(b), or (iii) shall resolve to take any of the actions specified
in clauses (i) or (ii) above; or

   (h) by Metamor at any time prior to the Metamor Special Meeting, upon three
days' prior notice to PSINet, if the Board of Directors of Metamor shall
approve a Superior Proposal; provided, however, that (i) Metamor shall have
complied with Section 7.8, (ii) the Board of Directors of Metamor shall have
concluded in good faith, after giving effect to all concessions which may be
offered by PSINet pursuant to clause (iii) below, after consultation with its
financial advisors and outside counsel, that such proposal is a Superior
Proposal, and (iii) prior to any such termination, Metamor shall, and shall
cause its financial and legal advisors to, negotiate with PSINet to make such
adjustments in the terms and conditions of this Agreement as would enable
PSINet

                                      1-31
<PAGE>

to proceed with the Transactions; provided, however, that it shall be a
condition to termination by Metamor pursuant to this Section 9.l(h) that
Metamor shall have made the payment of the Termination Fee to PSINet required
by Section 9.3(b).

   Section 9.2 Effect of Termination. In the event of termination of this
Agreement as provided in Section 9.1, this Agreement shall forthwith terminate
and there shall be no liability hereunder on the part of any of Metamor, PSINet
or Merger Subsidiary or their respective officers or directors; provided that
Sections 4.22 and 5.9 (Brokers); the second sentence of Sections 7.1(a) and (b)
(Confidentiality), Section 7.8 to the extent that the Termination Fee is
required to be paid, until such Termination Fee is paid; this Section 9.2,
Section 9.3 (Fees and Expenses); and Section 10.6 (Governing Law) shall survive
the termination and remain in full force and effect and; provided, further,
that (i) each party shall remain liable for any breaches prior to the
termination of this Agreement with respect to such party's covenants hereunder
and representations and warranties hereunder which were known by such party to
be untrue when made, and (ii) PSINet and Metamor shall each pay one-half of the
fees and expenses incurred in connection with the filing and printing of the
Registration Statement and Joint Proxy Statement/Prospectus (including any
preliminary joint proxy statement/prospectus) and the filing fees under the
Merger Control Laws.

   Section 9.3 Fees and Expenses.

   (a) Whether or not the Merger is consummated, all costs and expenses
incurred in connection with this Agreement and the Transactions shall be paid
by the party incurring such expenses, except as otherwise provided in Section
7.7 and Section 9.2.

   (b) PSINet and Metamor agree that Metamor shall be obligated to pay to
PSINet the sum of $45,000,000 (the "Termination Fee") solely as follows: (i) if
PSINet shall terminate this Agreement pursuant to Sections 9.1(g)(ii) or if
Metamor shall terminate this Agreement pursuant to Section 9.1(h); (ii) if (A)
Metamor or PSINet shall terminate this Agreement pursuant to Section 9.1(f) due
to the failure of Metamor's stockholders to approve and adopt this Agreement,
(B) at any time after the date of this Agreement and at or before the time of
the event giving rise to such termination an Acquisition Proposal with respect
to Metamor shall be publicly disclosed, and (C) within 12 months of the
termination of this Agreement, Metamor enters into a definitive agreement with
any third party with respect to an Acquisition Proposal or an Acquisition
Proposal is consummated; or (iii) if (A) PSINet shall terminate this Agreement
pursuant to Section 9.1(c), 9.1(e), 9.1(g)(i) or 9.1(g)(iii), (B) at any time
after the date of this Agreement and at or before the time of the event giving
rise to such termination there shall exist an Acquisition Proposal, (C)
following the existence of such Acquisition Proposal and prior to any such
termination, Metamor shall have intentionally breached (and not cured after
notice thereof) any of its material covenants or agreements set forth in this
Agreement in any material respect, and (D) within 12 months of any such
termination of this Agreement, Metamor shall enter into a definitive agreement
with any third party with respect to an Acquisition Proposal or an Acquisition
Proposal is consummated.

   (c) The Termination Fee shall be paid prior to, and shall be a pre-condition
to the effectiveness of, any termination of this Agreement by Metamor pursuant
to Section 9.1(h). The Termination Fee shall be paid within two business days
following any termination of this Agreement by PSINet pursuant to Section
9.1(g)(ii). Any other payment of the Termination Fee shall be made not later
than two business days after the entering into of an Acquisition Agreement with
respect to, or the consummation of, an Acquisition Proposal, as applicable. All
payments under Section 9.3(a) and (b) shall be made by wire transfer of
immediately available funds to an account designated by PSINet.

   (d) PSINet and Metamor agree that PSINet shall be obligated to pay to
Metamor the sum of $45,000,000 (the "PSINet Termination Fee") if and only if
(i) in the event that the PSINet Special Meeting (as it may be adjourned from
time to time) shall have concluded without PSINet having obtained the required
stockholder approval, and (ii) either (A) prior to the PSINet Special Meeting,
the Board of Directors of PSINet shall have approved a bona fide written
proposal or offer or entered into a definitive agreement with respect to a
merger,

                                      1-32
<PAGE>

reorganization, share exchange, consolidation, business combination,
recapitalization, liquidation, dissolution or similar transaction involving
PSINet, as the acquired entity, or with respect to the acquisition of a
majority of the voting power of the shares of PSINet Common Stock then
outstanding or all or substantially all the assets of PSINet for consideration
consisting of cash and/or securities (a "PSINet Acquisition Proposal"), or (B)
a PSINet Acquisition Proposal is announced to the public at any time after the
date of this Agreement and prior to the PSINet Special Meeting and, within 12
months following the final adjournment of the PSINet Special Meeting, PSINet
enters into a definitive agreement with any third party with respect to a
PSINet Acquisition Proposal or a PSINet Acquisition Proposal is consummated.
The PSINet Termination Fee shall be payable by PSINet at the time of the Board
of Directors action approving the PSINet Acquisition Proposal in the case of
clause (ii)(A) above and at the time of the entering into of the definitive
agreement relating to, or the consummation of, the PSINet Acquisition Proposal
in the case of clause (ii)(B) above. All payments under this Section 9.3(d)
shall be made by wire transfer of immediately available funds to an account
designated by Metamor.

   Section 9.4 Amendment. This Agreement may be amended by the parties hereto
at any time before or after approval hereof by the stockholders of Metamor and
PSINet, but, after such approval, no amendment shall be made which under
applicable Law would require approval of Metamor's or PSINet's stockholders
without the further approval of such stockholders, as the case may be. This
Agreement may not be amended except by an instrument in writing signed on
behalf of each of the parties hereto.

   Section 9.5 Waiver. At any time prior to the Closing, the parties hereto
may, to the extent permitted by applicable Law, (i) extend the time for the
performance of any of the obligations or other acts of any other party hereto,
(ii) waive any inaccuracies in the representations and warranties by any other
party contained herein or in any documents delivered by any other party
pursuant hereto and (iii) waive compliance with any of the agreements of any
other party or with any conditions to its own obligations contained herein. Any
agreement on the part of a party hereto to any such extension or waiver shall
be valid only if set forth in an instrument in writing signed on behalf of such
party.

                                   ARTICLE X

                               General Provisions

   Section 10.1 Non-Survival of Representations, Warranties and Agreements. The
representations and warranties in this Agreement shall not survive the Merger.

   Section 10.2 Notices. All notices or other communications under this
Agreement shall be in writing and shall be given (and shall be deemed to have
been duly given upon receipt) by delivery in person, by telecopy (with
confirmation of receipt), or by registered or certified mail, postage prepaid,
return receipt requested, addressed as follows:

                      If to Metamor:

                          Metamor Worldwide, Inc.
                          4400 Post Oak Parkway
                          Suite 1100
                          Houston, Texas 77027-3413
                          Attention: Chief Executive Officer
                          Telecopy No.: (713) 627-1059

                      With copies to:

                          Vinson & Elkins L.L.P.
                          1001 Fannin Street
                          Houston, Texas 77002
                          Attention: Jeffery B. Floyd, Esq.
                          Telecopy: (713) 615-5660

                                      1-33
<PAGE>

                      If to PSINet or Merger Subsidiary:

                          PSINet Inc.
                          510 Huntmar Park Drive
                          Herndon, Virginia 22070
                          Attention: Chairman and Chief Executive Officer
                          Telecopy: (703) 904-1608

                      With a copy to:

                          PSINet Inc.
                          510 Huntmar Park Drive
                          Herndon, Virginia 22070
                          Attention:Kathleen B. Horne, Esq., Senior Vice
                                President and General Counsel
                          Telecopy: (703) 397-5394

                      and to:

                          Nixon Peabody LLP
                          437 Madison Avenue
                          New York, New York 10022
                          Attention: Richard F. Langan, Jr., Esq.
                          Telecopy: (212) 940-9940

or to such other address as any party may have furnished to the other parties
in writing in accordance with this Section 10.2.

   Section 10.3 Specific Performance. The parties hereto agree that irreparable
damage would occur in the event that any of the provisions of this Agreement
were not performed in accordance with their specific terms or were otherwise
breached. Accordingly, the parties further agree that each party shall be
entitled to an injunction or restraining order to prevent breaches of this
Agreement and to enforce specifically the terms and provisions hereof in any
court of the United States or any state having jurisdiction, this being in
addition to any other right or remedy to which such party may be entitled under
this Agreement, at Law or in equity.

   Section 10.4 Entire Agreement. This Agreement (including the documents and
instruments referred to herein), together with the Confidentiality Agreement,
constitutes the entire agreement and supersedes all other prior agreements and
understandings, both written and oral, among the parties, or any of them, with
respect to the subject matter hereof.

   Section 10.5 Assignments; Parties in Interest. Neither this Agreement nor
any of the rights, interests or obligations hereunder may be assigned by any of
the parties hereto (whether by operation of Law or otherwise) without the prior
written consent of the other parties. Subject to the foregoing, this Agreement
shall be binding upon and inure solely to the benefit of each party hereto, and
nothing in this Agreement, express or implied, is intended to or shall confer
upon any Person not a party hereto any right, benefit or remedy of any nature
whatsoever under or by reason of this Agreement, including to confer third
party beneficiary rights, except for the provisions of Article III and Section
7.5.

   Section 10.6 Governing Law. This Agreement shall be governed in all respects
by the laws of the State of Delaware (without giving effect to the provisions
thereof relating to conflicts of Law). The exclusive venue for the adjudication
of any dispute or proceeding arising out of this Agreement or the performance
hereof shall be the courts located in Newcastle County, Delaware, and the
parties hereto and their Affiliates each consents to and hereby submits to the
jurisdiction of any court located in Newcastle County Delaware or Federal
courts in Delaware.


                                      1-34
<PAGE>

   Section 10.7 Headings; Disclosure. The descriptive headings herein are
inserted for convenience of reference only and are not intended to be part of
or to affect the meaning or interpretation of this Agreement. Any disclosure by
Metamor or PSINet in any portion of its respective Disclosure Schedule shall be
deemed disclosure in each other portion of such Disclosure Schedule to which
such disclosure reasonably relates on its face.

   Section 10.8 Certain Definitions and Rules of Construction.

   (a) As used in this Agreement:

   "Acquisition Agreement" has the meaning set forth in Section 7.8(b).

   "Acquisition Proposal" has the meaning set forth in Section 7.8(a).

   "Affiliate" as applied to any Person, shall mean any other Person directly
or indirectly controlling, controlled by, or under common control with, that
Person; for purposes of this definition, "control" (including, with correlative
meanings, the terms "controlling," "controlled by" and "under common control
with"), as applied to any Person, means the possession, directly or indirectly,
of the power to direct or cause the direction of the management and policies of
that Person, whether through the ownership of voting securities, by contract or
otherwise.

   "Agreement" has the meaning set forth in the preamble to this Agreement.

   "Assumed Metamor Options" has the meaning set forth in Section 3.1(e).

   "Blue Sky Laws" has the meaning set forth in Section 4.4(b).

   "Benefit Plans" has the meaning set forth in Section 4.9(a).

   "CERCLA" has the meaning set forth in Section 4.18.

   "Certificate Of Merger" has the meaning set forth in Section 1.3.

   "Certificates" has the meaning set forth in Section 3.2.

   "Closing" has the meaning set forth in Section 1.2.

   "Closing Date" has the meaning set forth in Section 1.2.

   "Code" has the meaning set forth in the preamble to this Agreement.

   "Confidentiality Agreement" has the meaning set forth in Section 7.1(a).

   "Contracts" has the meaning set forth in Section 4.15.

   "Debt" means, with respect to any Person, all indebtedness of such Person
for borrowed money or the deferred purchase price of property or services
(excluding trade payables and other accrued current liabilities arising in the
ordinary course of business), obligations of such Person evidenced by bonds,
notes, indentures or similar instruments, obligations of such Person under
interest rate agreements, currency hedging agreements, commodity price
protection agreements or similar hedging instruments, capital lease obligations
of such Person, redeemable capital stock of such Person and any other
obligations of such Person classified as indebtedness under GAAP.

   "Delaware Law" has the meaning set forth in Section 1.3.

   "Effective Time" has the meaning set forth in Section 1.3.

   "Environmental Laws" has the meaning set forth in Section 4.18.

   "Environmental Permits" has the meaning set forth in Section 4.18.

                                      1-35
<PAGE>

   "ERISA" shall have the meaning set forth in Section 4.9(a).

   "ERISA Affiliate" has the meaning set forth in Section 4.9(a).

   "Exchange Act" has the meaning set forth in Section 4.4(b).

   "Exchange Ratio" has the meaning set forth in Section 3.1(a)(iii).

   "Final Prospectus" has the meaning set forth in Section 4.5(a).

   "GAAP" has the meaning set forth in Section 4.5(b).

   "Governmental Entity" has the meaning set forth in Section 4.4(b).

   "Governmental Regulation" has the meaning set forth in Section 4.12.

   "Group Debt" means all Debt of Metamor or any one or more of its
Subsidiaries other than any Xpedior Debt.

   "Hazardous Materials" has the meaning set forth in Section 4.18.

   "HSR Act" has the meaning set forth in Section 4.4(b).

   "Indemnified Parties" has the meaning set forth in Section 7.5(a).

   "Information Technology" has the meaning set forth in Section 4.16(c).

   "Intellectual Property Rights" has the meaning set forth in Section 4.16(a).

   "IRS" has the meaning set forth in Section 4.6(b).

   "Joint Proxy Statement/Prospectus" has the meaning set forth in Section
7.2(a).

   "Laws" means any domestic (federal, state or local) or foreign law, rule,
regulation, order, judgment or decree.

   "Merger" has the meaning set forth in the preamble to this Agreement.

   "Merger Consideration" has the meaning set forth in Section 3.1(a)(iii).

   "Merger Control Laws" means the HSR Act and the Laws of any other
Governmental Entity with respect to competition, mergers or other business
combinations.

   "Merger Subsidiary" has the meaning set forth in the preamble to this
Agreement.

   "Metamor" has the meaning set forth in the preamble to this Agreement.

   "Metamor Board Approval" has the meaning set forth in Section 4.23.

   "Metamor Common Stock" has the meaning set forth in Section 3.1(a)(ii).

   "Metamor Disclosure Schedule" has the meaning set forth in Article IV,
Introduction.

   "Metamor Employees" has the meaning set forth in Section 7.10(a).

   "Metamor Financial Statements" has the meaning set forth in Section 4.5(b).

   "Metamor Material Adverse Effect" shall be any circumstance, event or
occurrence or series of circumstances, events or occurrences which individually
or in the aggregate with all other circumstances, events or occurrences would
be reasonably likely to have a material adverse effect on the business, assets,
operations, financial condition, revenues, results of operations or, solely
with respect to clause (iv) of this paragraph, prospects of Metamor and its
Subsidiaries taken as a whole, other than any change, circumstances or effect
relating to (i) a change after the date of this Agreement in Law, rule, or
regulation or generally accepted accounting principles or interpretations
thereof that applies to Metamor or its Subsidiaries, (ii) the economy or
securities markets in general, (iii) the industries in which Metamor operates
in general and not specifically

                                      1-36
<PAGE>

relating to Metamor, or (iv) this Agreement, the execution hereof or the
announcement of the Transactions, other than, with respect to this clause (iv),
changes, circumstances, events, occurrences or effects that would cause
irreparable harm to the long-term business prospects of the combined business
of PSINet, Metamor and their respective Subsidiaries following the Effective
Time.

   "Metamor Notes" means the 2.94% Convertible Subordinated Notes due 2004 of
Metamor issued under the Indenture dated as of August 15, 1997 between Metamor
and The Bank of New York, as Trustee.

   "Metamor Options" has the meaning set forth in Section 3.1(c)(i).

   "Metamor Permits" has the meaning set forth in Section 4.12.

   "Metamor Preferred Stock" has the meaning set forth in Section 4.2(a).

   "Metamor Property Rights" has the meaning set forth in Section 4.14.

   "Metamor Quarterly Financial Statements" has the meaning set forth in
Section 4.5(c).

   "Metamor Related Agreement" has the meaning set forth in the preamble to
this Agreement.

   "Metamor SEC Reports" has the meaning set forth in Section 4.5(a).

   "Metamor Special Meeting" has the meaning set forth in Section 6.3.

   "Metamor Stock Option Plan" has the meaning set forth in Section 3.1(c).

   "Metamor's Fairness Opinion Advisor" has the meaning set forth in Section
4.22.

   "Non-U.S. Benefit Plans" has the meaning set forth in Section 4.9(l).

   "Paying Agent" has the meaning set forth in Section 3.3(a).

   "Person" shall include individuals, corporations, partnerships, limited
liability companies, trusts, other entities and groups (which term shall
include a "group" as such term is defined in Section 13(d)(3) of the Exchange
Act).

   "PSINet" has the meaning set forth in the preamble to this Agreement.

   "PSINet Acquisition Proposals" has the meaning set forth in Section 9.3(d).

   "PSINet Benefit Plans" has the meaning set forth in Section 7.10(a).

   "PSINet Common Stock" has the meaning set forth in Section 3.1(a)(iii).

   "PSINet Disclosure Schedule" has the meaning set forth in Article V,
Introduction.

   "PSINet Financial Statements" has the meaning set forth in Section 5.5(b).

   "PSINet Material Adverse Effect" shall be any circumstance, event or
occurrence or series of circumstances, events or occurrences which individually
or in the aggregate with all other circumstances, events or occurrences would
be reasonably likely to have a material adverse effect on the business,
operations, financial condition or results of operations of PSINet and its
Subsidiaries taken as a whole, other than any change, circumstances or effect
relating to (i) a change after the date of this Agreement in Law or generally
accepted accounting principles or interpretations thereof that applies to
PSINet or its Subsidiaries, (ii) the economy or securities markets in general,
or (iii) the industries in which PSINet operates in general and not
specifically relating to PSINet.

   "PSINet Quarterly Financial Statements" has the meaning set forth in Section
5.5(c).

   "PSINet Related Agreement" has the meaning set forth in the preamble to this
Agreement.

   "PSINet SEC Reports" has the meaning set forth in Section 5.5(a).

   "PSINet Special Meeting" has the meaning set forth in Section 6.3.

   "PSINet Series C Preferred Stock" has the meaning set forth in Section 5.2.

                                      1-37
<PAGE>

   "PSINet Series D Preferred Stock" has the meaning set forth in Section 5.2.

   "PSINet Stock Options" has the meaning set forth in Section 5.2.

   "PSINet Termination Fee" has the meaning set forth in Section 9.3(d).

   "PSINet Termination Proposal" has the meaning set forth in Section 9.3(d).

   "Registration Statement" has the meaning set forth in Section 7.2(a).

   "SEC" has the meaning set forth in Section 4.5(a).

   "SEC Reports" has the meaning set forth in Section 4.5(a).

   "Securities Act" has the meaning set forth in Section 4.4(b).

   "Subsidiary" or "Subsidiaries" means, with respect to PSINet, Metamor or any
other Person, any corporation, partnership, joint venture or other legal entity
of which PSINet, Metamor or such other Person, as the case may be (either alone
or through or together with any other subsidiary), owns, directly or
indirectly, stock or other equity interests the holders of which are generally
entitled to more than 50% of the vote for the election of the board of
directors or other governing body of such corporation or other legal entity.

   "Superior Proposal" means a bona fide unsolicited written Acquisition
Proposal to acquire a majority of the voting power of the shares of Metamor
Common Stock then outstanding or all or substantially all the assets of Metamor
for consideration consisting of cash and/or securities which the Board of
Directors of Metamor concludes in good faith (after consultation with its
financial advisors and legal counsel), taking into account all legal,
financial, regulatory and other aspects of the proposal and the Person making
the proposal, (i) would, if consummated, result in a transaction that is
materially more favorable to Metamor's stockholders (in their capacities as
stockholders), from a financial point of view, than the Transactions, and (ii)
is reasonably capable of being completed, including a conclusion that its
financing, to the extent required, is then committed or is in the good faith
judgment of the Board of Directors of Metamor, reasonably capable of being
financed by such third party.

   "Surviving Corporation" has the meaning set forth in Section 1.1.

   "Tax" shall mean any federal, state, local, foreign or provincial income,
gross receipts, property, sales, service, use, license, lease, excise,
franchise, employment, payroll, withholding, employment, unemployment
insurance, workers' compensation, social security, alternative or added
minimum, ad valorem, value added, stamp, business license, occupation, premium,
environmental, windfall profit, customs, duties, estimated, transfer or excise
tax, or any other tax, custom, duty, premium, governmental fee or other
assessment or charge of any kind whatsoever, together with any interest,
penalty or addition to tax imposed by any Governmental Entity.

   "Termination Fee" has the meaning set forth in Section 9.3(b).

   "Transactions" shall mean the transactions contemplated by this Agreement
and the other agreements referenced herein including the Merger.

   "Xpedior" has the meaning set forth in Section 4.2(b).

   "Xpedior Common Stock" has the meaning set forth in Section 4.2(b).

   "Xpedior Debt" means any Debt of Xpedior or any one or more of its
Subsidiaries other than Debt payable to Metamor or a Subsidiary of Metamor
(other than Xpedior or a Subsidiary of Xpedior).

   "Xpedior Financial Statements" has the meaning set forth in Section 4.5(b).

   "Xpedior Preferred Stock'" has the meaning set forth in Section 4.2(b).

   "Xpedior SEC Reports" has the meaning set forth in Section 4.5(a).

   "Xpedior Stock Options" has the meaning set forth in Section 4.2(b).

                                      1-38
<PAGE>

   "Year 2000 Ready" has the meaning set forth in Section 4.16(c).

   (b) Other Rules of Construction.

     (i) References in this Agreement to any gender shall include references
  to all genders. Unless the context otherwise requires, references in the
  singular include references in the plural and vice versa. References to a
  party to this Agreement or to other agreements described herein means those
  Persons executing such agreements.

     (ii) The words "include", "including" or "includes" shall be deemed to
  be followed by the phrase "without limitation" or the phrase "but not
  limited to" in all places where such words appear in this Agreement. The
  word "or" shall be deemed to be inclusive.

     (iii) This Agreement is the joint drafting product of PSINet and
  Metamor, and each provision has been subject to negotiation and agreement
  and shall not be construed for or against either party as drafter thereof.

     (iv) In each case in this Agreement where this Agreement or a Contract
  is represented or warranted to be enforceable will be deemed to include as
  a limitation to the extent that enforceability may be subject to applicable
  bankruptcy, insolvency, reorganization, fraudulent conveyance, moratorium
  or similar Laws affecting the enforcement of creditors' rights generally
  and to general equitable principles, whether applied in equity or at Law.

     (v) All references in this Agreement to financial terms shall be deemed
  to refer to such terms as they are defined under GAAP, consistently
  applied.

   Section 10.9 Counterparts. This Agreement may be executed in two or more
counterparts which together shall constitute a single agreement.

   Section 10.10 Severability. If any term or other provision of this Agreement
is invalid, illegal or incapable of being enforced by any rule of Law or public
policy, all other terms and provisions of this Agreement shall nevertheless
remain in full force and effect so long as the economics or legal substance of
the Transactions are not affected in any manner materially adverse to any
party. Upon determination that any term or other provision hereof is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the
parties as closely as possible to the fullest extent permitted by applicable
Law in an acceptable manner to the end that the Transactions are fulfilled to
the extent possible.

   Section 10.11 Xpedior. Notwithstanding anything in this Agreement to the
contrary, in no event shall Metamor be required to take any action to cause
Xpedior or any of its Subsidiaries to take any action or refrain from taking
any action solely to the extent that the taking of such action by Metamor would
violate any duties under Delaware Law owed by Metamor, as a majority
stockholder, to the minority stockholders of Xpedior.

                                      1-39
<PAGE>

   IN WITNESS WHEREOF, PSINet, Merger Subsidiary and Metamor have caused this
Agreement to be signed by their respective officers thereunto duly authorized
all as of the date first written above.

                                          PSINet Inc.

                                                    /s/ Harold S. Wills
                                          By: _________________________________
                                                     Harold S. Wills,
                                                         President

                                          PSINet Shelf IV Inc.

                                                    /s/ Harold S. Wills
                                          By: _________________________________
                                                     Harold S. Wills,
                                                         President

                                          Metamor Worldwide, Inc.

                                                   /s/ Peter T. Dameris
                                          By: _________________________________
                                                     Peter T. Dameris,
                                                Chief Executive Officer and
                                                         President

                                      1-40
<PAGE>

                                                                         Annex 2

                      FLEETBOSTON ROBERTSON STEPHENS INC.
                             555 California Street
                                   Suite 2600
                        San Francisco, California 94104
                                 (415) 781-9700

                                 March 21, 2000

Board of Directors
PSINet Inc.
510 Huntmar Park Drive
Reston, Virginia 22070

Members of the Board:

   We understand that PSINet Inc. ("PSINet"), Metamor Worldwide, Inc.
("Metamor") and PSINet Merger Sub, Inc. (a wholly owned subsidiary of PSINet,
"Merger Sub") are proposing to enter into an Agreement and Plan of Merger (the
"Agreement") which will provide, among other things, for the merger (the
"Merger") of Merger Sub with and into Metamor. Upon consummation of the Merger,
Metamor will become a wholly owned subsidiary of PSINet. Under the terms set
forth in a draft of the Agreement dated March 20, 2000 (the "Draft Agreement"),
at the effective time of the Merger (the "Effective Time"), the shares of
common stock of Metamor, par value $.01 per share ("Metamor Common Stock"),
issued and outstanding immediately prior to the Effective Time, other than
certain shares to be canceled pursuant to the Agreement, will be converted into
the right to receive shares of the common stock of PSINet, par value $.01 per
share ("PSINet Common Stock"), at an exchange ratio (the "Exchange Ratio") of
0.9000 share(s) of PSINet Common Stock for each share of Metamor Common Stock.
The terms and conditions of the Merger are set out more fully in the Draft
Agreement.

   You have asked us whether, in our opinion, the Exchange Ratio is fair from a
financial point of view and as of the date hereof to PSINet.

   For purposes of rendering this opinion we have, among other things:

  (i) reviewed certain publicly available financial statements and other
      business and financial information of Metamor, Xpedior Incorporated (an
      approximately 67%-owned (on a fully diluted as-converted basis)
      subsidiary of Metamor, "Xpedior") and PSINet, respectively;

  (ii) reviewed certain internal financial statements and other financial and
       operating data, including certain financial forecasts and other
       forward looking information, concerning (a) Metamor prepared by the
       managements of Metamor and PSINet, respectively and (b) Xpedior
       prepared by the managements of Xpedior, Metamor and PSINet,
       respectively;

  (iii) reviewed certain internal financial statements and other financial
        and operating data, including certain financial forecasts and other
        forward looking information (including, specifically, forecasts of
        certain revenue synergies and cost savings that are expected to
        result from the Merger ("Expected Synergies")), concerning PSINet
        prepared by the management of PSINet;

  (iv) reviewed certain publicly available research estimates of research
       analysts regarding Metamor, Xpedior and PSINet, respectively;

  (v) held discussions with the respective managements of Metamor, Xpedior
      and PSINet concerning the businesses, past and current operations,
      financial condition and future prospects of each of Metamor, Xpedior
      and PSINet, independently and combined, including discussions with the
      managements of Metamor, Xpedior and PSINet concerning the Expected
      Synergies as well as their views regarding the strategic rationale for
      the Merger;

                                      2-1
<PAGE>

  (vi) reviewed the financial terms and conditions set forth in the Draft
       Agreement;

  (vii) reviewed the stock price and trading history of Metamor, Xpedior and
        PSINet;

  (viii) compared the financial performance of Metamor and Xpedior and the
         prices and trading activity of Metamor Common Stock and the common
         stock of Xpedior with that of certain other publicly traded
         companies which we deemed comparable to Metamor and Xpedior;

  (ix) compared the financial terms of the Merger with the financial terms,
       to the extent publicly available, of other transactions that we deemed
       relevant;

  (x) reviewed the pro forma impact of the Merger on PSINet EBITDA per share
      and revenue per share;

  (xi) prepared a discounted cash flow analysis for each of Metamor and
       Xpedior;

  (xii) participated in discussions among representatives of Metamor, Xpedior
        and PSINet and their financial and legal advisors; and

  (xiii) made such other studies and inquiries, and reviewed such other data,
         as we deemed relevant.

   In our review and analysis, and in arriving at our opinion, we have assumed
and relied upon the accuracy and completeness of all of the financial and other
information provided to us (including information furnished to us orally or
otherwise discussed with us by the managements of Metamor, Xpedior and PSINet)
or publicly available and have neither attempted to verify, nor assumed
responsibility for verifying, any of such information. We have relied upon the
assurances of the managements of Metamor, Xpedior and PSINet that they are not
aware of any facts that would make such information inaccurate or misleading.
Furthermore, we did not obtain or make, or assume any responsibility for
obtaining or making, any independent evaluation or appraisal of the properties,
assets or liabilities (contingent or otherwise) of Metamor, Xpedior or PSINet,
nor were we furnished with any such evaluation or appraisal. With respect to
the financial forecasts and projections (and the assumptions and bases
therefor) for each of Metamor, Xpedior and PSINet that we have reviewed
(including the Expected Synergies), we have assumed that such forecasts and
projections (including the Expected Synergies) have been reasonably prepared in
good faith on the basis of reasonable assumptions and reflect the best
currently available estimates and judgments as to the future financial
condition and performance of Metamor, Xpedior and PSINet, respectively, and we
have further assumed that such projections and forecasts (including the
Expected Synergies) will be realized in the amounts and in the time periods
currently estimated. In this regard, we note that each of Metamor, Xpedior and
PSINet face exposure to the Year 2000 problem. We have not undertaken any
independent analysis to evaluate the reliability or accuracy of the assumptions
made with respect to the potential effect that the Year 2000 problem might have
on Metamor's, Xpedior' and PSINet' respective forecasts. With your permission,
we have relied upon statements from PSINet' management to us regarding the
strategic value of the Merger and its assessment that the Merger represents a
compelling and significant strategic opportunity for PSINet in the eServices
segment. We have assumed that the Merger will be consummated upon the terms set
forth in the Draft Agreement without material alteration thereof, including,
among other things, that the Merger will be accounted for as a "purchase"
business combination in accordance with U.S. generally accepted accounting
principles ("GAAP"). In addition, we have assumed that the historical financial
statements of each of Metamor, Xpedior and PSINet reviewed by us have been
prepared and fairly presented in accordance with U.S. GAAP consistently
applied. We have relied as to all legal matters relevant to rendering our
opinion on the advice of counsel.

   This opinion is necessarily based upon market, economic and other conditions
(including the interest rate environment) as in effect on, and information made
available to us as of, the date hereof. It should be understood that subsequent
developments may affect the conclusion expressed in this opinion and that we
disclaim any undertaking or obligation to advise any person of any change in
any matter affecting this opinion which may come or be brought to our attention
after the date of this opinion. Our opinion is limited to the fairness, from a
financial point of view and as to the date hereof, of the Exchange Ratio to
PSINet. We do not express any opinion as to (i) the value of any employee
agreement or other arrangement entered into in connection with the Merger, (ii)
any tax or other consequences that might result from the Merger or (iii) what
the value of PSINet Common Stock will be when issued to Metamor's stockholders
pursuant to the Merger or

                                      2-2
<PAGE>

the price at which the shares of PSINet Common Stock may be traded in the
future. Our opinion does not address the relative merits of the Merger and the
other business strategies that PSINet Board of Directors has considered or may
be considering, nor does it address the decision of PSINet Board of Directors
to proceed with the Merger.

   We have been engaged by PSINet to render a fairness opinion in connection
with the Merger and will receive (i) a fee contingent upon the delivery of this
opinion and (ii) an additional fee contingent upon the consummation of the
Merger. In addition, PSINet has agreed to indemnify us for certain liabilities
that may arise out of our engagement. In the past, we have provided certain
investment banking services to PSINet for which we have been paid fees,
including acting as financial advisor to PSINet with respect to certain
acquisitions and minority investments. We maintain a market in the shares of
PSINet Common Stock. In the ordinary course of business, we may trade in
PSINet' securities, Metamor's securities and Xpedior' securities for our own
account and the account of our customers and, accordingly, may at any time hold
a long or short position in PSINet' securities, Metamor's securities or
Xpedior' securities.

   Our opinion expressed herein is provided for the information of the Board of
Directors of PSINet in connection with its evaluation of the Merger. Our
opinion is not intended to be and does not constitute a recommendation to any
stockholder of PSINet or Metamor as to how such stockholder should vote, or
take any other action, with respect to the Merger. This opinion may not be
summarized, described or referred to or furnished to any party except with our
express prior written consent.

   Based upon and subject to the foregoing considerations, it is our opinion
that the Exchange Ratio is fair from a financial point of view and as of the
date hereof to PSINet.

                                          Very truly yours,

                                          FleetBoston Robertson Stephens Inc.

                                            /s/ FleetBoston Roberston Stephens
                                                           Inc.
                                          By___________________________________

                                      2-3
<PAGE>

                                                                         Annex 3

                                                        LAZARD FRERES & CO. LLC
                                                        30 Rockefeller Plaza
                                                        New York, New York 10020
                                                        Phone: 212-632-6000
                                                        Fax: 212-632-6060
                                                        www.lazard.com
                                                        March 21, 2000

The Board of Directors
Metamor Worldwide, Inc.
4400 Post Oak Parkway
Suite 1100
Houston, TX 77027-3413

Dear Members of the Board:

   We understand that Metamor Worldwide, Inc. (the "Company"), PSINet Inc. (the
"Purchaser") and PSINet Shelf IV Inc., a wholly owned subsidiary of the
Purchaser ("Merger Sub"), propose to enter into an Agreement and Plan of Merger
(the "Merger Agreement"), pursuant to which Merger Sub will be merged with and
into the Company (the "Merger") as a result of which the Company will become a
wholly owned subsidiary of the Purchaser. Pursuant to the Merger Agreement,
each share of common stock, par value $0.01 per share, of the Company (the
"Company Common Stock"), issued and outstanding immediately prior to the
effective time of the Merger, other than shares of the Company Common Stock
held in the treasury of the Company and shares of the Company Common Stock held
by the Purchaser or any of its subsidiaries, will be converted into the right
to receive 0.90 shares (the "Exchange Ratio") of common stock of the Purchaser,
par value $0.01 per share (the "Purchaser Common Stock").

   You have requested our opinion as to the fairness, from a financial point of
view, to the holders of the Company Common Stock of the Exchange Ratio. In
connection with this opinion, we have:

  (i) Reviewed the financial terms and conditions of a draft Merger Agreement
      dated March 21, 2000;

  (ii) Analyzed certain historical business and financial information
       relating to the Purchaser and the Company, including Xpedior
       Incorporated, a subsidiary of the Company ("Xpedior");

  (iii) Reviewed various financial forecasts and other data provided to us by
        the Purchaser and the Company relating to their respective
        businesses, including in the case of the Company relating to
        Xpedior's business;

                                      3-1
<PAGE>


  (iv) Held discussions with members of senior management of the Purchaser,
       the Company and Xpedior with respect to the businesses and prospects
       of the Purchaser, the Company and Xpedior, respectively, and the
       strategic objectives of each;

  (v) Reviewed public information with respect to certain other companies in
      lines of business we believe to be generally comparable to those of the
      Purchaser, the Company and Xpedior;

  (vi) Reviewed the financial terms of certain business combinations
       involving companies in lines of business we believe to be generally
       comparable to those of the Company and Xpedior;

  (vii) Reviewed the historical stock prices and trading volumes of the
        Purchaser Company Stock, Company Common Stock and the common stock of
        Xpedior; and

  (viii) Conducted such other financial studies, analyses and investigations
         as we deemed appropriate.

   We have relied upon the accuracy and completeness of the foregoing
information and have not assumed any responsibility for any independent
verification of such information or any independent valuation or appraisal of
any of the assets or liabilities of the Purchaser, the Company or Xpedior, or
concerning the solvency of or issues relating to solvency concerning the
Purchaser, the Company or Xpedior. With respect to financial forecasts, we have
assumed that they have been reasonably prepared on bases reflecting the best
currently available estimates and judgments of the management of the Purchaser,
the Company and Xpedior as to the future financial performance of the Purchaser,
the Company and Xpedior, respectively. We assume no responsibility for and
express no view as to such forecasts or the assumptions on which they are based.

   Further, our opinion is necessarily based on economic, monetary, market and
other conditions as in effect on, and the information made available to us as
of, the date hereof. In rendering our opinion, we did not address the relative
merits of the Merger, any alternative potential transaction or the Company's
underlying decision to effect the Merger. In that regard, we have not been
authorized by the Company to solicit, nor have we solicited, third-party
indications of interest for the acquisition of all or any part of the Company.

   In rendering our opinion, we have assumed that the Merger will be consummated
on the terms described in the Merger Agreement, without any waiver of any
                                     3-2
<PAGE>
material terms or conditions by the Company and that obtaining the necessary
regulatory approvals, if any, for the Merger will not have an adverse effect on
the Purchaser, the Company or Xpedior. We have also assumed that the definitive
Merger Agreement will not differ in any material respect from the draft thereof
furnished to us.

   Lazard Freres & Co. LLC is acting as investment banker to the Company in
connection with the Merger and will receive a fee for our services, a
substantial portion of which is contingent upon the consummation of the Merger.
We have in the past provided investment banking services to the Company for
which we received usual and customary compensation.

   Our engagement and the opinion expressed herein are for the benefit of the
Company's Board of Directors and our opinion is rendered to the Company's Board
of Directors in connection with its consideration of the Merger. This opinion
is not intended to and does not constitute a recommendation to any holder of
the Company Common Stock as to whether such stockholder should vote for the
Merger. We are not expressing any opinion herein as to the prices at which the
Company Common Stock or the Purchaser Common Stock will trade following the
announcement or consummation of the Merger. It is understood that this letter
may not be disclosed or otherwise referred to without our prior consent, except
as may otherwise be required by law or by a court of competent jurisdiction.

   Based on and subject to the foregoing, we are of the opinion that the
Exchange Ratio in connection with the Merger is fair to the holders of the
Company Common Stock from a financial point of view.

                                          Very truly yours,

                                          Lazard Freres & Co. LLC

                                                     /s/ Patrick Sayer
                                          By___________________________________
                                                       Patrick Sayer
                                                     Managing Director

                                      3-3
<PAGE>


                                                                    Annex 4

                        AMENDMENT NUMBER ONE TO THE

                                PSINET INC.

                     1999 EMPLOYEE STOCK PURCHASE PLAN

   This Amendment Number One to the PSINet Inc. 1999 Employee Stock Purchase
Plan (the "Plan") was approved and adopted pursuant to Section 17 of the Plan
by the Committee (as defined in the Plan) and the Board of Directors of PSINet
Inc. (the "Company") subject to the approval of the shareholders of the
Company. Capitalized terms used herein which are not otherwise defined shall
have the meanings ascribed to them in the Plan.

   The Plan is hereby amended, effective only upon obtaining shareholder
approval, to: (i) reflect an increase in the number of shares of the Company's
Common Stock with respect to which options may be granted under the Plan as a
result of a two-for-one stock split effected by the Company on February 11,
2000, (ii) increase the number of shares of the Company's Common Stock with
respect to which options may be granted under the Plan by an additional
2,000,000 shares, and (iii) permit the Committee to establish special Offering
Periods for employees of acquired companies. The specific provisions of the
Plan are amended as follows:

  1. The first sentence of Section 4.1 is amended to read in its entirety as
     follows:

    The number of shares of Common Stock for which options may be granted
    under the Plan is 4,115,000 shares less any shares issued under the
    Company's 1999 International Employee Stock Purchase Plan.

  2. Section 2.12 of the Plan is amended by adding the following language at
     the end thereof:

    Notwithstanding the foregoing, if a Subsidiary of the Company becomes a
    Designated Subsidiary or if a trade or business is acquired by the
    Company in an asset acquisition during a regular Offering Period, the
    Committee in its discretion may provide for a special, one-time
    Offering Period for the Employees of such Designated Subsidiary or
    acquired trade or business that begins on a payroll period designated
    by the Committee and that ends on the last day of the regular Offering
    Period then in progress. All matters in the Plan relating to an
    Offering Period, including without limitation the fixing of the
    Enrollment Date and the determination of the Purchase Price, shall for
    such special Offering Period be based on the beginning of such special
    Offering Period and not on the beginning of the regular Offering Period
    then in progress.

   Except as specifically amended hereby, the Plan shall continue in full force
and effect.

   In witness whereof, PSINet Inc. has caused this Amendment Number One to be
executed by its duly authorized officer this 11th day of May, 2000.

                                          PSINet Inc.

                                              /s/ William L. Schrader

                                          By: ___________________________

                                            William L. Schrader, Chairman and

                                              Chief Executive Officer

                                      4-1
<PAGE>


                        AMENDMENT NUMBER ONE TO THE

                                PSINET INC.

              1999 INTERNATIONAL EMPLOYEE STOCK PURCHASE PLAN

   This Amendment Number One to the PSINet Inc. 1999 International Employee
Stock Purchase Plan (the "Plan") was approved and adopted pursuant to Section
17 of the Plan by the Committee (as defined in the Plan) and the Board of
Directors of PSINet Inc. (the "Company") subject to the approval of the
shareholders of the Company. Capitalized terms used herein which are not
otherwise defined shall have the meanings ascribed to them in the Plan.

   The Plan is hereby amended, effective only upon obtaining shareholder
approval, to: (i) reflect an increase in the number of shares of the Company's
Common Stock with respect to which options may be granted under the Plan as a
result of a two-for-one stock split effected by the Company on February 11,
2000, (ii) increase the number of shares of the Company's Common Stock with
respect to which options may be granted under the Plan by an additional
2,000,000 shares, and (iii) permit the Committee to establish special Offering
Periods for employees of acquired companies. The specific provisions of the
Plan are amended as follows:

  1. The first sentence of Section 4.1 is amended to read in its entirety as
     follows:

    The number of shares of Common Stock for which options may be granted
    under the Plan is 4,115,000 shares less any shares issued under the
    Company's 1999 Employee Stock Purchase Plan.

  2. Section 2.13 of the Plan is amended by adding the following language at
     the end thereof:

    Notwithstanding the foregoing, if a Subsidiary of the Company becomes a
    Designated Subsidiary or if a trade or business is acquired by the
    Company in an asset acquisition during a regular Offering Period, the
    Committee in its discretion may provide for a special, one-time
    Offering Period for the Employees of such Designated Subsidiary or
    acquired trade or business that begins on a payroll period designated
    by the Committee and that ends on the last day of the regular Offering
    Period then in progress. All matters in the Plan relating to an
    Offering Period, including without limitation the fixing of the
    Enrollment Date and the determination of the Purchase Price, shall for
    such special Offering Period be based on the beginning of such special
    Offering Period and not on the beginning of the regular Offering Period
    then in progress.

   Except as specifically amended hereby, the Plan shall continue in full force
and effect.

   In witness whereof, PSINet Inc. has caused this Amendment Number One to be
executed by its duly authorized officer this 11th day of May, 2000.

                                          PSINet Inc.

                                              /s/ William L. Schrader

                                          By: ___________________________

                                            William L. Schrader, Chairman and

                                              Chief Executive Officer

                                      4-2
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20. INDEMNIFICATION OF OFFICERS AND DIRECTORS

   Under Sections 721 through 725 of the Business Corporation Law of the State
of New York (the "BCL"), the Registrant has broad powers to indemnify its
directors, officers and other employees. These sections (i) provide that the
statutory indemnification and advancement of expenses provision of the BCL are
not exclusive, provided that no indemnification may be made to or on behalf of
any director or officer if a judgment or other final adjudication adverse to
the director or officer establishes that his acts were committed in bad faith
or were the result of active and deliberate dishonesty and were material to the
cause of action as adjudicated, or that he personally gained in fact a
financial profit or other advantage to which he was not legally entitled, (ii)
establish procedures for indemnification and advancement of expenses that may
be contained in the certificate of incorporation or by-laws, or, when
authorized by either of the foregoing, set forth in a resolution of the
shareholders or directors of an agreement providing for indemnification and
advancement of expenses, (iii) apply a single standard for statutory
indemnification for third-party and derivative suits by providing that
indemnification is available if the director or officer acted in good faith,
for a purpose which he reasonably believed to be in the best interests of the
corporation, and, in criminal actions, had no reasonable cause to believe that
his conduct was unlawful and (iv) permit the advancement of litigation expenses
upon receipt of an undertaking to repay such advance if the director or officer
is ultimately determined not to be entitled to indemnification or to the extent
the expenses advanced exceed the indemnification to which the director or
officer is entitled. Section 726 of the BCL permits the purchase of insurance
to indemnify a corporation or its officers and directors to the extent
permitted.

   As permitted by Section 721 of the BCL, the Registrant's By-laws provide
that the Registrant shall indemnify its officers and directors, as such, to the
fullest extent permitted by applicable law, and that expenses reasonably
incurred by any such officer or director in connection with a threatened or
actual action or proceeding shall be advanced or promptly reimbursed by the
Registrant in advance of the final disposition of such action or proceeding
upon receipt of an undertaking by or on behalf of such officer or director to
repay such amount if and to the extent that it is ultimately determined that
such officer or director is not entitled to indemnification.

   Article EIGHTH of the Registrant's Certificate of Incorporation provides
that no director of the Registrant shall be held personally liable to the
Registrant or its shareholders for damages for any breach of duty in his
capacity as a director occurring after authorization of such Article EIGHTH by
the shareholders unless a judgment or other final adjudication adverse to him
establishes that (1) his acts or omissions were in bad faith or involved
intentional misconduct or a knowing violation of law, or (2) he personally
gained in fact a financial profit or other advantage to which he was not
legally entitled, or (3) his acts violated section 719 of the BCL. The
Registrant has entered into Indemnity Agreements with its directors and certain
key officers pursuant to which the Registrant generally is obligated to
indemnify its directors and such officers to the full extent permitted by the
BCL as described above. PSINet also has purchased directors' and officers'
liability insurance.

ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

   The following is a list of all exhibits filed as part of this Registration
Statement.

   See Exhibit Index.

   FINANCIAL STATEMENTS AND FINANCIAL STATEMENTS SCHEDULES:

   Financial Statements and Financial Statements Schedules:

   Incorporated by reference in this registration statement from PSINet's
Annual Report on Form 10-K for the year ended December 31, 1999.

                                      II-1
<PAGE>

ITEM 22. UNDERTAKINGS.

   (a) The undersigned Registrant hereby undertakes that insofar as
indemnification for liabilities arising under the Securities Act of 1933, as
amended (the "Act") may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the foregoing provisions, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.

   (b) The undersigned Registrant hereby undertakes:

     (1) To file, during any period in which offers or sales are being made,
  a post-effective amendment to this registration statement:

       (i) To include any prospectus required by Section 10(a)(3) of the
    Securities Act of 1933;

       (ii) To reflect in the prospectus any facts or events arising after
    the effective date of the registration statement (or the most recent
    post-effective amendment thereof) which, individually or in the
    aggregate, represent a fundamental change in the information set forth
    in the registration statement. Notwithstanding the foregoing, any
    increase or decrease in volume of securities offered (if the total
    dollar value of securities offered would not exceed that which was
    registered) and any deviation from the low or high end of the estimated
    maximum offering range may be reflected in the form of prospectus filed
    with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes
    in volume and price represent no more than a 20 percent change in the
    maximum aggregate offering price set forth in the "Calculation of
    Registration Fee" table in the effective registration statement;

       (iii) To include any material information with respect to the plan
    of distribution not previously disclosed in the registration statement
    or any material change to such information in the registration
    statement;

     (2) That, for the purpose of determining any liability under the
  Securities Act of 1933, each such post-effective amendment shall be deemed
  to be a new registration statement relating to the securities offered
  therein, and the offering of such securities at that time shall be deemed
  to be the initial bona fide offering thereof.

     (3) To remove from registration by means of a post-effective amendment
  any of the securities being registered which remain unsold at the
  termination of the offering.

   (c) The undersigned Registrant hereby undertakes:

     (1) To deliver or cause to be delivered with the prospectus, to each
  person to whom the prospectus is sent or given, the latest annual report to
  security holders that is incorporated by reference in the prospectus and
  furnished pursuant to and meeting the requirements of Rule 14a-3 or Rule
  14c-3 under the Securities and Exchange Act of 1934; and, where interim
  financial information required to be presented by Article 3 of Regulation
  S-X is not set forth in the prospectus, to deliver, or cause to be
  delivered to each person to whom the prospectus is sent or given, the
  latest quarterly report that is specifically incorporated by reference in
  the prospectus to provide such interim financial information.

     (2) To respond to requests for information that is incorporated by
  reference into the prospectus pursuant to Items 4, 10(b), 11 or 13 of this
  Form, within one business day of receipt of such request, and to send the
  incorporated documents by first class mail or other equally prompt means.
  This includes

                                      II-2
<PAGE>

  information contained in documents filed subsequent to the effective date
  of the registration statement through the date of responding to the
  request.

   (d) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934)
that is incorporated by reference in the registration statement shall be deemed
to be a new registration statement relating to the securities offered therein,
and the offering of such securities at that time shall be deemed to be the
initial bona fide offering thereof.

   (e) The undersigned Registrant hereby undertakes to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the registration statement when it became effective.


                                      II-3
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant has duly caused this amendment no. 1 to registration statement to be
signed on its behalf by the undersigned, thereunto duly authorized in the City
of Ashburn, Commonwealth of Virginia on May 11, 2000.

                                          PSINet Inc.

                                          By: /s/ William L. Schrader
                                          -------------------------------------

                                             William L. Schrader Chairman and
                                             Chief Executive Officer


   Pursuant to the requirements of the Securities Act of 1933, as amended, this
amendment no. 1 to registration statement has been signed by the following
persons in the capacities and on the dates indicated.

<TABLE>
<CAPTION>
              Signature                          Title                   Date
              ---------                          -----                   ----
<S>                                    <C>                        <C>
       /s/ William L. Schrader         Chairman, Chief Executive     May 11, 2000
______________________________________  Officer and Director
         William L. Schrader            (Principal Executive
                                        Officer)

                  *                    President, Chief Operating    May 11, 2000
______________________________________  Officer and Director
           Harold S. Wills

                  *                    Vice Chairman, Executive      May 11, 2000
______________________________________  Vice President and
           David H. Kunkel              Director

                  *                    Vice President and Acting     May 11, 2000
______________________________________  Chief Financial Officer
           Jorge R. Forgues             (Principal Financial and
                                        Accounting Officer)

                  *                    Director                      May 11, 2000
______________________________________
          William H. Baumer

                  *                    Director                      May 11, 2000
______________________________________
            Ralph J. Swett

                  *                    Director                      May 11, 2000
______________________________________
</TABLE>     Ian P. Sharp

*By:   /s/ William L. Schrader

  ------------------------------

     William L. Schrader

      Attorney-in-fact
<PAGE>

<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                      DESCRIPTION                             LOCATION
 -------                     -----------                             --------
 <C>     <C>                                                 <S>
 2.1     Agreement and Plan of Merger, dated August 22,      Incorporated by
         1999, among PSINet, PSINet Shelf I Inc. and         reference from Exhibit
         Transaction Network Services, Inc.                  2.1 to PSINet's Current
                                                             Report on Form 8-K dated
                                                             August 24, 1999 located
                                                             under Securities and
                                                             Exchange Commission File
                                                             No. 0-25812

 2.2     Amendment No. 1, dated October 14, 1999, to         Incorporated by
         Agreement and Plan of Merger dated August 22,       reference from Annex 1
         1999, among PSINet, PSINet Shelf IV Inc. and        to Amendment No. 1 to
         Transaction Network Services, Inc.                  PSINet's Registration
                                                             Statement on Form S-4
                                                             filed on October 19,
                                                             1999 located under
                                                             Securities and Exchange
                                                             Commission File No. 333-
                                                             88325.

 2.3     Agreement and Plan of Merger, dated as of March 21, Included as Annex 1 to
         2000 among PSINet, Inc. PSINet Shelf I Inc. and     the Proxy
         Metamor Worldwide, Inc.                             Statement/Prospectus
                                                             which forms a part of
                                                             this registration
                                                             statement. The exhibits
                                                             listed in the table of
                                                             contents to the
                                                             Agreement and Plan of
                                                             Merger have been omitted
                                                             pursuant to Item
                                                             601(b)(2) of Regulation
                                                             S-K. The registrant
                                                             agrees to furnish
                                                             supplementally a copy of
                                                             any omitted exhibit to
                                                             the Commission upon
                                                             request.

 3.1     Restated Certificate of Incorporation dated         Incorporated by
         November 9, 1999                                    reference from Exhibit
                                                             3.1 to PSINet's Current
                                                             Report on Form 8-K dated
                                                             November 23, 1999,
                                                             located under Securities
                                                             and Exchange Commission
                                                             File No. 0-25812
                                                             ("November 23, 1999 8-
                                                             K")

 3.2     Certificate of Correction of Restated Certificate   Incorporated by
         Incorporation dated as of December 2, 1999          reference from Exhibit
                                                             3.1 to PSINet's Current
                                                             Report on Form 8-K dated
                                                             November 24, 1999,
                                                             located under Securities
                                                             and Exchange Commission
                                                             File No. 0-25812
                                                             ("November 24, 1999 8-
                                                             K")

 3.3     Certificate of Amendment of Certificate of          Incorporated by
         Incorporation dated as of January 31, 2000          reference from Exhibit
                                                             3.3 to PSINet's
                                                             Registration Statement
                                                             on Form S-4 filed on
                                                             February 9, 2000 located
                                                             under Securities and
                                                             Exchange Commission File
                                                             No. 333-96459

 3.4     Amended and Restated By-laws of PSINet              Incorporated by
                                                             reference from Exhibit
                                                             3.4 to PSINet's Annual
                                                             Report on Form 10K for
                                                             the year ended December
                                                             31, 1999 located under
                                                             Securities and Exchange
                                                             Commission File No. 0-
                                                             25812 ("1999 Form 10-K")

 4.1     Form of 10% Senior Notes due 2005                   Incorporated by
                                                             reference from Exhibit
                                                             4.1 to PSINet's Current
                                                             Report on Form 8-K dated
                                                             April 22, 1998 located
                                                             under Securities and
                                                             Exchange Commission File
                                                             No. 0-25812 ("April 22,
                                                             1998 8-K")
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                      DESCRIPTION                             LOCATION
 -------                     -----------                             --------
 <C>     <C>                                                 <S>
  4.2    Indenture dated as of April 13, 1998 between PSINet Incorporated by
         and Wilmington Trust Company, as Trustee            reference from Exhibit
                                                             4.2 to the April 22,
                                                             1998 8-K

  4.3    Form of 11% Senior Notes due 2008                   Incorporated by
                                                             reference from PSINet's
                                                             Registration Statement
                                                             on Form S-4 declared
                                                             effective on February
                                                             16, 1999 located under
                                                             Securities and Exchange
                                                             Commission File No. 333-
                                                             68385

  4.4    Indenture dated as of November 3, 1998 between      Incorporated by
         PSINet and Wilmington Trust Company, as trustee     reference from Exhibit
                                                             4.1 to the November 10,
                                                             1998 8-K

  4.5    First Supplemental Indenture dated as of November   Incorporated by
         12, 1998 between PSINet and Wilmington Trust        reference from Exhibit
         Company, as trustee                                 4.1 to PSINet's
                                                             Quarterly Report on Form
                                                             10-Q for the quarter
                                                             ended September 30, 1998
                                                             located under Securities
                                                             and Exchange Commission
                                                             File No. 0-25812
                                                             ("September 1998 10-Q")

  4.6    Form of unregistered Dollar-denominated             Incorporated by
         11% Senior Notes due 2009                           reference from Exhibit
                                                             4.6 to PSINet's
                                                             Registration Statement
                                                             on Form S-4 filed on
                                                             August 6, 1999 located
                                                             under Securities and
                                                             Exchange Commission File
                                                             No. 333-84721 ("August
                                                             1999 Registration
                                                             Statement")

  4.7    Form of unregistered Euro-denominated               Incorporated by
         11% Senior Notes due 2009                           Reference from Exhibit
                                                             4.7 to August 1999
                                                             Registration Statement

  4.8    Form of registered 11% Senior Notes due 2009        Incorporated by
                                                             Reference from Exhibit
                                                             4.8 to August 1999
                                                             Registration Statement

  4.9    Indenture dated as of July 23, 1999 between PSINet  Incorporated by
         and Wilmington Trust Company, as Trustee            Reference from Exhibit
                                                             4.9 to August 1999
                                                             Registration Statement

  4.10   Form of Common Stock Certificate                    Incorporated by
                                                             reference from Exhibit
                                                             4.1 to the May 1995
                                                             Registration Statement

  4.11   Form of Common Stock Certificate (name change)      Incorporated by
                                                             reference from Exhibit
                                                             4.1A to PSINet's
                                                             Registration Statement
                                                             on Form S-1 declared
                                                             effective on December
                                                             14, 1995 located under
                                                             Securities and Exchange
                                                             Commission File No. 33-
                                                             99610 ("December 1995
                                                             Registration Statement")

  4.12   Form of 6% Series C Cumulative Convertible          Incorporated by
         Preferred Stock Certificate                         reference from Exhibit
                                                             4.1 to the May 7, 1999
                                                             8-K

  4.13   Article Fourth of the Restated Certificate          See Exhibit 3.1
         Incorporation of PSINet, as amended

  4.14   Article I of the Amended and Restated By-laws of    See Exhibit 3.9
         PSINet, as amended
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                     DESCRIPTION                                         LOCATION
 -------                    -----------                                         --------
 <C>     <C>                                                <S>
  4.15   Form of Rights Agreement, dated as of May 8, 1996, Incorporated by reference from Exhibit 1 to
         between PSINet and First Chicago Trust             PSINet's Registration Statement on Form 8-A
         Company of New York, as Rights Agent, which        dated June 3, 1996 located under Securities and
         includes as Exhibit A--Certificate of Amendment;   Exchange Commission File No. 0-25812
         Exhibit B--Form of Rights Certificate; and Exhibit
         C--Summary of Rights to Purchase Shares of
         Preferred Stock

  4.16   Amendment No. 1, dated as of July 21, 1997, to     Incorporated by reference from Exhibit 4.1.1 to
         Rights Agreement, dated as of May 8, 1996,         PSINet's Current Report on Form 8-K dated
         between PSINet and First Chicago Trust Company     August 1, 1997 located under Securities and
         of New York, as Rights Agent.                      Exchange Commission File No. 0-25812

  4.17   Amendment No. 2, dated as of July 31, 1997, to     Incorporated by reference from Exhibit 4.1.2
         Rights Agreement, dated as of May 8, 1996          PSINet's Current Report on Form 8-K dated
         between PSINet and First Chicago Trust Company     August 20, 1997 located under Securities and
         of New York, as Rights Agent.                      Exchange Commission File No. 0-25812

  4.18   Amendment No. 3, dated as of November 5, 1999, to  Incorporated by reference from Exhibit 4 to
         Rights Agreement, dated as of May 8, 1996,         PSINet's Registration Statement on Form 8/A
         between PSINet and First Chicago Trust Company     filed on November 5, 1999
         of New York

  4.19   Deposit Agreement dated as of May 4, 1999 between  Incorporated by reference from Exhibit 4.2 to
         PSINet and Wilmington Trust Company,               the May 7, 1999 8-K.
         as deposit agent

  4.20   Form of unregistered Dollar-denominated 10% Senior Incorporated by reference from Exhibit 4.2 to
         Notes due 2006                                     PSINet's November 24, 1999 8-K

  4.21   Form of unregistered Euro-denominated 10% Senior   Incorporated by reference from Exhibit 4.3 to
         Notes due 2006                                     PSINet's November 24, 1999 8-K

  4.22   Form of registered 10% Senior Notes due 2006       Incorporated by reference from Exhibit 4.4 to
                                                            PSINet's Current Report on Form 8-K dated
                                                            February 1, 2000 located under Securities and
                                                            Exchange Commission File No. 0-25812 ("February
                                                            1, 2000 8-K")

  4.23   Indenture dated as of December 2, 1999 between     Incorporated by reference from Exhibit 4.1 to
         PSINet and Wilmington Trust Company, as Trustee    the November 24, 1999 8-K

  4.24   Form of 7% Series D Cumulative Convertible         Incorporated by reference from Exhibit 4.3 to
         Preferred Stock                                    the February 1, 2000 8-K

  4.25   Deposit Agreement dated as of February 1, 2000     Incorporated by reference from Exhibit 4.1 to
         between PSINet and Wilmington Trust Company,       the February 1, 2000 8-K
         as deposit agent

  4.26   First Amendment to Deposit Agreement dated as of   Incorporated by reference from Exhibit 4.2 to
         February 7, 2000, between PSINet and Wilmington    the February 1, 2000 8-K
         Trust Company, as deposit agent
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                        DESCRIPTION                               LOCATION
 -------                       -----------                               --------
 <C>     <C>                                                     <S>
  5      Opinion of Nixon Peabody LLP                            Filed herewith

  8.1    Opinion of Nixon Peabody LLP regarding tax matters      Filed herewith
         (included in Exhibit 5)

  8.2    Opinion of Vinson & Elkins L.L.P. regarding tax matters Filed herewith

  12     Computation of Ratio of Earnings to Combined            Incorporated by
         Fixed Charges and Preferred Stock Dividends             reference from Exhibit
                                                                 12 to the 1999 Form 10-K

  21     Significant subsidiaries of PSINet                      Incorporated by
                                                                 reference from Exhibit
                                                                 21 to the 1999 Form 10-K

  23.1   Consent of PricewaterhouseCoopers LLP                   Filed herewith

  23.2   Consent of Ernst & Young LLP                            Filed herewith

  23.3   Consent of Nixon Peabody LLP (included in Exhibit 5)    Filed herewith

  23.4   Consent of Vinson & Elkins L.L.P. (included in          Filed herewith
         Exhibit 8.2)

  24.1   Power of Attorney                                       Included in the
                                                                 signature page to the
                                                                 initial filing of this
                                                                 registration statement

  24.2   Power of Attorney for David Moir and Jorge R. Forgues   Filed herewith

  99.1   Form of Proxy for holders of PSINet Inc. common         Filed herewith
         stock

  99.2   Form of Proxy for holders of Metamor Worldwide,         Filed herewith
         Inc. common stock

  99.3   Stockholder Agreement, dated as of March 21,            Previously filed
         2000, among William L. Schrader, Metamor
         Worldwide, Inc. and PSINet Inc.

  99.4   Stockholder Agreement, dated as of March 21,            Previously filed
         2000, among Peter T. Dameris, PSINet Inc. and
         Metamor Worldwide, Inc.

  99.5   Consent of FleetBoston Robertson Stephens Inc.          Previously filed

  99.6   Consent of Lazard Freres & Co. LLC                      Filed herewith

  99.7   Additional soliciting material for PSINet Inc.          Filed herewith
         shareholders

  99.8   Additional soliciting material for Metamor              Filed herewith
         Worldwide, Inc. stockholders
</TABLE>

<PAGE>

                                                                       EXHIBIT 5
                               Nixon Peabody LLP
                               437 Madison Avenue
                         New York, New York  10022-7001
                                 (212) 940-3000
                              Fax:  (212) 940-3111

                                 May 11, 2000

PSINet Inc.
44983 Knoll Square
Ashburn, Virginia  20147

Ladies and Gentlemen:

     We have acted as counsel to PSINet Inc., a New York corporation (the
"Company"), in connection with the Registration Statement on Form S-4, File No.
333-34802, as amended by Amendment No. 1 (the "Registration Statement"), filed
by the Company with the Securities and Exchange Commission (the "Commission")
under the Securities Act of 1933, as amended (the "Act"), relating to the
offering of up to 40,750,647 shares of common stock of the Company, par value
$.01 per share (the "Securities"), to be issued in connection with the merger of
the Company's wholly owned subsidiary, PSINet Shelf IV Inc., a Delaware
corporation, into Metamor Worldwide, Inc., a Delaware corporation (the
"Merger"), pursuant to the Agreement and Plan of Merger (the "Merger Agreement")
by and among the Company, PSINet Shelf IV Inc. and Metamor Worldwide, Inc.,
dated as of March 21, 2000, filed as Annex 1 to the Joint Proxy
Statement/Prospectus which forms a part of the Registration Statement (the
"Joint Proxy Statement/Prospectus ").

     This opinion is being delivered to you in connection with the Registration
Statement.

     In connection with the foregoing, we have examined the Registration
Statement, the Joint Proxy Statement/Prospectus and the Merger Agreement.  We
also have examined originals or copies, certified or otherwise identified to our
satisfaction, of such corporate records, certificates and other documents and
have made such investigations of law as we have deemed necessary or appropriate
as a basis for the opinions expressed below.

     As to questions of fact material to our opinions expressed herein, we have,
when relevant facts were not independently established, relied upon certificates
of, and information received from, the Company and/or representatives of the
Company.  We have made no independent investigation of the facts stated in such
certificates or as to any information received from the Company and/or
representatives of the Company and do not opine as to the accuracy of such
factual matters.  We also have relied, without investigation, upon certificates
and other documents from, and conversations with, public officials.

     In rendering the following opinions, we have assumed, without
investigation, the authenticity of any document or other instrument submitted to
us as an original, the conformity to the originals of any document or other
instrument submitted to us as a copy, the genuineness
<PAGE>

PSINet Inc.
May 11, 2000
Page 2

of all signatures on such originals or copies, and the legal capacity of natural
persons who executed any such document or instrument at the time of execution
thereof.

     Members of our firm involved in the preparation of this opinion are
licensed to practice law in the State of New York and we do not purport to be
experts on, or to express any opinion herein concerning, the laws of any other
jurisdiction other than the laws of the State of New York.

     Based upon and subject to the foregoing, and the other qualifications and
limitations contained herein, and after (a) the Commission shall have entered an
appropriate order declaring effective the above-referenced Registration
Statement, as amended, (b) the shares of Common Stock have, if required, been
duly qualified or registered, as the case may be, for sale under applicable
state securities laws, and (c) the shareholders of the Company shall have
approved the issuance of the securities contemplated by the Joint
Proxy Statement/Prospectus we are of the opinion that:

     1.    The Securities, when issued in accordance with the Merger Agreement,
will be duly authorized and validly issued and will be fully paid and non-
assessable, subject to Section 630 of the Business Corporation Law of the State
of New York.

     2.    The discussion in the Joint Proxy Statement/Prospectus included in
the Registration Statement under the caption "Material United States Federal
Income Tax Consequences of the Merger" fairly summarizes the federal income tax
consequences that are likely to be material to the shareholders of Metamor
Worldwide, Inc. who are United States citizens or residents or domestic
corporations who hold their shares as capital assets within the meaning of
Section 1221 of the Internal Revenue Code (the "Code") and who are not subject
to special treatment under the tax laws.

     Our opinions expressed herein in paragraph number 2 are based upon our
interpretation of the current provisions of the Code and existing judicial
decisions, administrative regulations and published rulings and procedures.  Our
opinions are not binding upon the Internal Revenue Service or courts and there
is no assurance that the Internal Revenue Service will not successfully
challenge the conclusions set forth herein.  No assurance can be given that
future legislative, judicial or administrative changes, on either a prospective
or retroactive basis, would not adversely affect the accuracy of the conclusions
stated herein.  We undertake no obligation to advise you of changes in law which
may occur after the date hereof.

     Our opinions in paragraph number 2 are limited to the federal income tax
matters and the federal law of the United States of America addressed herein,
and no other opinions are rendered with respect to any other matter not
specifically set forth in the foregoing opinion and we assume no responsibility
as to the applicability thereto, or the effect thereon, of the laws of any other
jurisdiction.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the use of our name as it appears under the
caption "Legal Matters" in the Registration Statement.  In giving such consent,
we do not thereby admit that we come within the category of
<PAGE>

PSINet Inc.
May 11, 2000
Page 3

persons whose consent is required under Section 7 of the Act or the rules and
regulations of the Commission thereunder.

     We further consent to the filing of this opinion as an exhibit to
applications to the securities commissioners of the various states of the United
States, to the extent so required, in connection with the registration of the
Securities.

     This opinion is intended solely for your benefit in connection with the
transactions described above and, except as provided in the two immediately
preceding paragraphs, may not be otherwise communicated to, reproduced, filed
publicly or relied upon by, any other person or entity for any other purpose
without our express prior written consent.  This opinion is limited to the
matters stated herein, and no opinion or belief is implied or may be inferred
beyond the matters expressly stated herein.

     We wish to advise you that certain attorneys who are partners or employees
of Nixon Peabody LLP own certain shares of the Company's common stock.

                                        Very truly yours,

                                        /s/  Nixon Peabody LLP

<PAGE>

                                                                     EXHIBIT 8.2

                                ATTORNEYS AT LAW
                             VINSON & ELKINS L.L.P.
                             2300 FIRST CITY TOWER
                               1001 FANNIN STREET
                           HOUSTON, TEXAS 77002-6760
                            TELEPHONE (713) 758-2222
                               FAX (713) 758-2346
    WRITER'S TELEPHONE                                      WRITER'S FAX
    (713) 758-2192                                          (713) 615-5210

                                 May 9, 2000


Metamor Worldwide, Inc.
4400 Post Oak Parkway, Suite 1100
Houston, Texas 77027-3413


Gentlemen:

        We participated in the preparation of the Registration Statement and
Amendment No. 1 thereto filed with the Securities and Exchange Commission with
respect to the merger of PSINet Shelf IV Inc., a Delaware corporation and a
wholly-owned subsidiary of PSINet Inc., a New York corporation, with and into
Metamor Worldwide, Inc., a Delaware corporation (the "Registration Statement").

        We hereby confirm that the conclusions of law with respect to federal
income tax matters set forth in the Registration Statement under the heading
"Material United States Federal Income Tax Consequences of the Merger" are
accurate and complete in all material respects.

        We hereby consent to the use of our name in the Registration Statement
and to the filing of this letter as an exhibit to the Registration Statement. In
giving such consent, however, we do not admit that we are within the category of
persons whose consent is required under Section 7 of the Securities Act of 1933.


                                                Very truly yours,



                                                /s/ VINSON & ELKINS L.L.P.





<PAGE>

                                                                    Exhibit 23.1

                       Consent of Independent Accountants
                       ----------------------------------

We hereby consent to the incorporation by reference in this Amendment No. 1 to
the Registration Statement on Form S-4 of our report dated March 20, 2000
relating to the consolidated financial statements and financial statement
schedule, which appears in PSINet Inc.'s Annual Report on Form 10-K for the year
ended December 31, 1999. We also consent to the reference to us under the
heading "Experts" in such Registration Statement.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Washington, DC
May 10, 2000

<PAGE>

                                                                    Exhibit 23.2


                        CONSENT OF INDEPENDENT AUDITORS
                        -------------------------------

     We consent to the reference to our firm under the caption "Experts" in
Amendment No. 1 to the Registration Statement (Form S-4) and related joint
prospectus/proxy statement of PSINet Inc. and Metamor Worldwide, Inc. for the
registration of PSINet Inc.'s common stock and to the incorporation by reference
therein of our report dated February 8, 2000 with respect to the consolidated
financial statements of Metamor Worldwide, Inc. included in its Annual Report
(Form 10-K) for the year ended December 31, 1999, filed with the Securities and
Exchange Commission.


/s/ Ernst & Young LLP

Houston, Texas
May 10, 2000

<PAGE>

                                                                    Exhibit 24.2
                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints William L. Schrader, Harold S. Wills,
David N. Kunkel, Kathleen B. Horne and Emory Donelson, and each or any of them,
his true and lawful attorney-in-fact and agent, with full power of substitution
and resubstitution, for him and in his name, place and stead, in any and all
capacities, to sign any registration statement on Form S-4 relating to the
transactions contemplated by the Agreement and Plan of Merger dated as of March
21, 2000 between PSINet Inc., PSINet Shelf IV Inc. and Metamor Worldwide, Inc.,
including any registration statements filed pursuant to Rule 462(b) under the
Securities Act of 1933 and any and all amendments (including post-effective
amendments) to the registration statement and to any registration statement
filed pursuant to Rule 462(b), and to file the same, with all exhibits thereto
and other documents in connection therewith, with the Securities and Exchange
Commission, granting unto each said attorney-in-fact and agent full power and
authority to do and perform each and every act and thing requisite and necessary
to be done in and about the foregoing, as fully to all intents and purposes as
he might or could do in person, hereby ratifying and confirming all that said
attorney-in-fact and agent or any of them, or their, his or her substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.


                                             Dated as of May 11, 2000

/s/ David L. Moir
- -----------------
David L. Moir


/s/ Jorge R. Forgues
- --------------------
Jorge R. Forgues




<PAGE>

                                                                    EXHIBIT 99.1
                                  PSINET INC.
                              44983 Knoll Square
                            Ashburn, Virginia 20147

        SOLICITED BY THE BOARD OF DIRECTORS FOR THE SPECIAL MEETING OF
                         SHAREHOLDERS ON JUNE 15, 2000

    The undersigned hereby appoints as Proxies, David N. Kunkel and Kathleen B.
Horne, each with the power to appoint his or her substitute, and hereby
authorizes each of them to represent and to vote, as designated below, all
shares of Common Stock of PSINet Inc. (the "Company") held of record by the
undersigned on April 25, 2000 at the Special Meeting of Shareholders to be held
on June 15, 2000 and any adjournments thereof.

                                                                SEE REVERSE SIDE

- --------------------------------------------------------------------------------
                         /\ FOLD AND DETACH HERE /\

You may also vote the shares held in this account by telephone or electronically
through the Internet. Voting by telephone or via the Internet will eliminate the
need to mail voted proxy card(s) representing shares held in this account. To
vote by telephone or electronically please follow the steps below:

o Have your proxy card and social security number available.

o Be ready to enter the PIN number indicated on the reverse side of the card
  just below the perforation.

To vote using the telephone:

o Using a touch-tone telephone, dial 1-877-PRX-VOTE (1-877-779-8683) 24 hours a
  day 7 days a week.

To vote using the Internet:

o Log on to the Internet and go to the website http://www.eproxyvote.com/psix-1

Both voting systems preserve the confidentiality of your vote and will confirm
your voting instructions with you. You may also change your selections on any or
all of the proposals to be voted.

              YOUR VOTE IS IMPORTANT TO US. THANK YOU FOR VOTING.
<PAGE>

                                                                  |
[ X ] Please mark your                                            |    5912
      votes as in this                                            |_____
      example.

THIS PROXY, WHEN PROPERLY EXECUTED WILL BE VOTED AS DIRECTED. IF NO DIRECTION IS
GIVEN WITH RESPECT TO A PARTICULAR PROPOSAL, THIS PROXY WILL BE VOTED FOR
PROPOSALS 1 AND 2.
       _________________________________________________________________
        THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR PROPOSALS 1 AND 2.
       _________________________________________________________________

1. To approve the issuance of stock in connection with the agreement and plan of
   merger among PSINet Inc., PSINet Shelf IV Inc. (a wholly-owned subsidiary of
   PSINet Inc.) and Metamor Worldwide, Inc.

        FOR     AGAINST    ABSTAIN
       [   ]     [   ]      [   ]


2. To approve amendments to the Company's Employee Stock Purchase Plans.

        FOR     AGAINST    ABSTAIN
       [   ]     [   ]      [   ]


3. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON ANY
   OTHER BUSINESS THAT MAY PROPERLY COME BEFORE THE MEETING.

I PLAN TO ATTEND THE    [   ]
  SPECIAL MEETING

If shares are registered in more than one name, the signatures of all such
persons are required. A corporation should sign in its full corporate name by a
duly authorized officer stating his title. Trustees, guardians, executors and
other fiduciaries should sign in their official capacity giving their full title
as such. If a partnership, please sign in the partnership name by authorized
persons. Note: Please sign exactly as name appears hereon.


PLEASE MARK, DATE, SIGN AND RETURN THIS PROXY CARD PROMPTLY, USING THE ENCLOSED
ENVELOPE. NO POSTAGE IS REQUIRED IF MAILED IN THE UNITED STATES OF AMERICA.


                                           -------------------------------------


                                           -------------------------------------
                                            SIGNATURE(S)               DATE


- --------------------------------------------------------------------------------
                          /\ FOLD AND DETACH HERE /\

                                  PSINET INC.
                              44983 Knoll Square
                               Ashburn, VA 20147

Dear Shareholder:

You are cordially invited to attend the Special Meeting of Shareholders of
PSINet Inc., which will be held at the Company's offices located at 44983 Knoll
Square, Ashburn, Virginia, at 10:00 a.m., on Thursday, June 15, 2000.

The accompanying Notice of Special Meeting of Shareholders and Joint
Proxy Statement/Prospectus describe the items to be considered and acted upon by
the Shareholders. Please mark the boxes on the proxy card to indicate how your
shares are to be voted. Alternatively, you may vote your shares by telephone or
electronically through the Internet. Please see reverse.

Whether or not you plan to attend this meeting, please sign, date and return
your proxy card above (or vote via telephone or the Internet) as soon as
possible so that your shares can be voted at the meeting in accordance with your
instructions. If you attend the meeting, you may revoke your proxy, if you
wish, and vote in person. It is very important that your shares be represented.

Sincerely,

PSINet Inc.

<PAGE>

                                                                    EXHIBIT 99.2

                                FRONT OF PROXY

                            METAMOR WORLDWIDE, INC.

         This proxy is solicited on behalf of the board of directors.

  The undersigned appoints Peter T. Dameris, Edward L. Pierce and Margaret G.
Reed, as Proxies, with the power of substitution, and authorizes them to
represent and to vote at the Special Meeting of Stockholders to be held June 15,
2000, or any adjournment thereof, all the shares of common stock of Metamor
Worldwide, Inc. held of record by the undersigned on April 25, 2000, as
designated below.

                                 BACK OF PROXY

                       SPECIAL MEETING OF STOCKHOLDERS of

                             METAMOR WORLDWIDE, INC.

                                  June 15, 2000

- --------------------------------------------------------------------------------
                            PROXY VOTING INSTRUCTIONS
- --------------------------------------------------------------------------------


TO VOTE BY MAIL
- ---------------
Please date, sign and mail your proxy card in the envelope provided as soon as
possible.

TO VOTE BY TELEPHONE (TOUCH-TONE PHONE ONLY)
- --------------------------------------------
Please call toll-free 1-800-PROXIES and follow the instructions. Have your
control number and the proxy card available when you call.

TO VOTE BY INTERNET
- -------------------
Please access the web page at "www.voteproxy.com" and follow the on-screen
instructions. Have your control number available when you access the web page.


YOUR CONTROL NUMBER IS  -->        ________________________________________


                 Please Detach and Mail in the Envelope Provided

 /  X  / Please mark your votes as in this example


  1. To adopt the agreement and plan of merger among PSINet Inc., PSINet Shelf
     IV Inc. and Metamor Worldwide, Inc.:

       [_]  FOR                [_]  AGAINST            [_]  ABSTAIN

  2. The Proxies are authorized to vote in their best judgment upon such other
     business as may properly be brought before the meeting or any
     adjournment(s) thereof.

  This Proxy when properly executed, will be voted in the manner directed by the
undersigned stockholder.  IF NO DIRECTION IS GIVEN, THIS PROXY WILL BE VOTED FOR
THE PROPOSAL.

PLEASE MARK, SIGN, DATE AND PROMPTLY RETURN THIS PROXY CARD USING THE ENCLOSED
ENVELOPE.


Signature ____________________  Signature, if held jointly ____________________

Dated ________, 2000


NOTE: Please sign exactly as name appears below.  When shares are held by joint
tenants, both should sign.  If acting as attorney, executor, trustee, or in any
other representative capacity, sign name and title.

<PAGE>

                                                                    EXHIBIT 99.6

                                        LAZARD FRERES & CO. LLC
                                        30 Rockefeller Plaza
                                        New York, NY  10020

                                        Phone 212-632-6000
                                        Fax   212-632-6060
                                        www.lazard.com



                                        May 10, 2000





The Board of Directors
Metamor Worldwide, Inc.
4400 Post Oak Parkway
Suite 1100
Houston, TX 77027-3413

    We hereby consent to (i) the use of our opinion letter, dated March 21,
2000, to the Board of Directors of Metamor Worldwide, Inc. ("Metamor"), included
as Annex 3 to the joint prospectus/proxy statement which forms a part of the
Registration Statement on Form S-4 relating to the proposed merger between
PSINet Inc.'s wholly owned subsidiary PSINet Shelf IV Inc. and Metamor, and (ii)
references to such opinion in such joint prospectus/proxy statement under the
captions "Summary--Fairness Opinions of Financial Advisors," "The Merger--
Background to the Merger," "The Merger--Metamor's Reasons for the Merger and
Board of Directors' Recommendation," and "The Merger--Opinion of Metamor's
Financial Advisor." In giving such consent, we do not thereby admit that we come
within the category of persons whose consent is required under Section 7 of the
Securities Act of 1933, as amended, or the rules and regulations of the
Securities and Exchange Commission promulgated thereunder nor do we thereby
admit that we are experts with respect to any part of such Registration
Statement within the meaning of the term "experts" as used in the Securities Act
of 1933, as amended, or the rules and regulations of the Securities and Exchange
Commission promulgated thereunder.

                                        Very truly yours,

                                        LAZARD FRERES & CO. LLC


                                        By: /s/ Patrick Sayer
                                           ------------------------------
                                           Patrick Sayer
                                           Managing Director

<PAGE>

                                                                    Exhibit 99.7


                   ATTENTION:  IMPORTANT MATERIALS ENCLOSED.
                     PLEASE READ BEFORE CASTING YOUR VOTE.

     The enclosed proxy material relates to a Special Meeting of PSINet
shareholders to be held on June 15, 2000 to approve the issuance of PSINet
shares in connection with a proposed merger with Metamor Worldwide, Inc. and to
approve certain amendments to PSINet's Employee Stock Purchase Plans. This
material is being mailed to all PSINet shareholders who were owners as of the
April 25 record date for the Special Meeting.

     In order to have your shares voted at the Special Meeting, you must sign
and return the enclosed proxy card. In addition to returning your signed proxy
card in the pre-paid envelope provided, you can vote via the Internet or
telephone by following the instructions on the proxy card.

     Please note that PSINet has recently solicited proxies for its May 15
Annual Meeting as well. This Special Meeting is different than the Annual
Meeting and the actions scheduled to be taken at the Special Meeting are
different from those taken at the Annual Meeting. Whether or not you voted at
the Annual Meeting, we urge you to vote on the actions to be taken at the
Special Meeting by taking the time to vote the enclosed proxy card.

     If you have any questions, please call MacKenzie Partners, Inc. at (800)
322-2885.


                   ATTENTION:  IMPORTANT MATERIALS ENCLOSED.
                     PLEASE READ BEFORE CASTING YOUR VOTE.

<PAGE>

                                                                Exhibit 99.8


                   ATTENTION:  IMPORTANT MATERIALS ENCLOSED.
                     PLEASE READ BEFORE CASTING YOUR VOTE.

     The enclosed proxy material relates to a Special Meeting of Metamor
Worldwide stockholders to be held on June 15, 2000, to approve a proposed merger
with PSINet.  This material is being mailed to all Metamor stockholders who were
owners of common stock of Metamor as of the April 25, 2000 record date for the
Special Meeting.

     In order to have your shares voted at the Special Meeting, you must sign
and return the enclosed proxy card. In addition to returning your signed proxy
card in the pre-paid envelope provided, you can vote via the Internet or by
telephone by following the instructions on the proxy card.

     Please note that Metamor is concurrently soliciting proxies for its May 18,
2000 Annual Meeting.  If you were a stockholder on March 20, 2000, the Annual
Meeting record date, you should have received an Annual Report, proxy statement
and proxy card for the Annual Meeting.   To vote on the Annual Meeting
proposals, you will need to use the proxy card that was included with the Annual
Meeting materials.  Please take the time to vote the enclosed proxy card, as
well as the Annual Meeting proxy card which was sent to you separately.

     If you have any questions, please call Georgeson Shareholder Communications
Inc. at (800) 223-2064.


                   ATTENTION:  IMPORTANT MATERIALS ENCLOSED.
                     PLEASE READ BEFORE CASTING YOUR VOTE.




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