MCLEODUSA INC
424B3, 2000-11-02
RADIOTELEPHONE COMMUNICATIONS
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<PAGE>
                                                               Filed pursuant to
                                                                  Rule 424(b)(3)
                                                      Registration No. 333-48248

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PROSPECTUS                                                                            [LOGO]
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                                  $150,000,000

                             MCLEODUSA INCORPORATED

                               OFFER TO EXCHANGE
                  MCLEODUSA 12% SENIOR NOTES DUE JULY 15, 2008
                              FOR ALL OUTSTANDING
        CAPROCK COMMUNICATIONS CORP. 12% SENIOR NOTES DUE JULY 15, 2008

      INTEREST PAYABLE JANUARY 15 AND JULY 15, COMMENCING JANUARY 15, 2001

                      MATERIAL TERMS OF THE EXCHANGE OFFER

    - We are offering to exchange all outstanding CapRock 12% senior notes due
      July 15, 2008 that are validly tendered and not validly withdrawn for an
      equal amount of a new series of McLeodUSA 12% senior notes due July 15,
      2008.

    - The exchange offer will expire at 5:00 P.M., New York City time, on
      December 5, 2000, unless extended.

    - We will accept the CapRock notes for exchange only if holders of at least
      a majority of the aggregate principal amount of each of the CapRock notes
      and the CapRock 11 1/2% senior notes due 2009 have consented to certain
      amendments to the indentures governing such notes. Such consents were
      received by CapRock as of October 27, 2000.

    - The exchange offer is further subject to the consummation of the merger of
      CapRock with a wholly-owned subsidiary of McLeodUSA and to customary
      conditions, including that the exchange offer not violate applicable law.
    - You may withdraw the tender of your CapRock notes at any time before the
      expiration of the exchange offer.

    - We will not receive any proceeds from the exchange offer.

    - You may tender your CapRock notes only in denominations of $1,000 and
      multiples of $1,000.

    - The exchange of notes should not result in recognition of gain or loss to
      exchanging noteholders for U.S. federal income tax purposes.

PLEASE SEE "RISK FACTORS" BEGINNING ON PAGE 18 FOR A DISCUSSION OF FACTORS YOU
SHOULD CONSIDER IN CONNECTION WITH THE EXCHANGE OFFER.

WE ARE NOT MAKING THIS EXCHANGE OFFER IN ANY STATE OR JURISDICTION WHERE IT IS
NOT PERMITTED.
<PAGE>
  NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
  COMMISSION HAS APPROVED THE NOTES TO BE DISTRIBUTED IN THE EXCHANGE OFFER, NOR
  HAVE ANY OF THESE ORGANIZATIONS DETERMINED THAT THIS PROSPECTUS IS TRUTHFUL OR
  COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                The date of this prospectus is October 30, 2000.
<PAGE>
                               TABLE OF CONTENTS

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                                                                PAGE
                                                              --------
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Summary.....................................................      1
Risk Factors................................................     18
Cautionary Note Regarding Forward-Looking Statements........     26
The Exchange Offer..........................................     27
Use of Proceeds.............................................     37
Information About McLeodUSA.................................     38
Selected Consolidated Financial Data of McLeodUSA...........     41
Pro Forma Financial Data....................................     45
Description of the McLeodUSA Notes..........................     50
Other McLeodUSA Indebtedness................................     84
Information About CapRock...................................     86
Selected Consolidated Financial Data of CapRock.............     88
Description of the CapRock Notes............................     91
Legal Matters...............................................    130
Experts.....................................................    130
Where You Can Find More Information.........................    131
Index to Consolidated Financial Statements of Splitrock
  Services, Inc.............................................    F-1
</TABLE>

    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS. WE HAVE NOT AUTHORIZED ANY OTHER PERSON TO PROVIDE
YOU WITH DIFFERENT INFORMATION. IF ANYONE PROVIDES YOU WITH DIFFERENT OR
INCONSISTENT INFORMATION, YOU SHOULD NOT RELY ON IT. WE ARE NOT MAKING AN OFFER
TO SELL THESE SECURITIES IN ANY JURISDICTION WHERE THE OFFER OR SALE IS NOT
PERMITTED. YOU SHOULD ASSUME THAT THE INFORMATION APPEARING IN THIS PROSPECTUS
IS ACCURATE ONLY AS OF THE DATE ON THE FRONT COVER OF THIS PROSPECTUS. OUR
BUSINESS, FINANCIAL CONDITION, RESULTS OF OPERATIONS AND PROSPECTS MAY HAVE
CHANGED SINCE THAT DATE.

    WE HAVE NOT TAKEN NOR WILL WE TAKE ANY ACTION IN ANY JURISDICTION TO PERMIT
A PUBLIC OFFERING OF THE MCLEODUSA NOTES OR THE POSSESSION OR DISTRIBUTION OF
THIS PROSPECTUS OTHER THAN IN THE UNITED STATES.

    THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH ARE NOT PRESENTED
IN OR DELIVERED WITH THIS PROSPECTUS. THIS INFORMATION IS AVAILABLE TO YOU
WITHOUT CHARGE UPON YOUR ORAL OR WRITTEN REQUEST. YOUR REQUESTS SHOULD BE
DIRECTED TO MCLEODUSA INCORPORATED, MCLEODUSA TECHNOLOGY PARK, 6400 C STREET SW,
POST OFFICE BOX 3177, CEDAR RAPIDS, IOWA 52406-3177, ATTENTION: GENERAL COUNSEL
(TELEPHONE (319) 790-7775). IN ORDER TO ENSURE DELIVERY OF THE DOCUMENTS IN
ADVANCE OF THE EXPIRATION OF THE EXCHANGE OFFER, ANY REQUEST SHOULD BE MADE AT
LEAST FIVE BUSINESS DAYS PRIOR TO THE DATE OF SUCH EXPIRATION.
<PAGE>
                                    SUMMARY

    THIS DOCUMENT IS A PROSPECTUS OF MCLEODUSA. THIS SUMMARY HIGHLIGHTS SELECTED
INFORMATION FROM THIS PROSPECTUS. IT DOES NOT CONTAIN ALL OF THE INFORMATION
THAT MAY BE IMPORTANT TO YOU. YOU SHOULD CAREFULLY READ THIS ENTIRE PROSPECTUS
AND THE OTHER DOCUMENTS TO WHICH THIS DOCUMENT REFERS YOU, INCLUDING THE LETTER
OF TRANSMITTAL. SEE "WHERE YOU CAN FIND MORE INFORMATION." IN ADDITION, YOU
SHOULD CAREFULLY CONSIDER THE FACTORS SET FORTH UNDER THE CAPTION "RISK
FACTORS."

                                 THE COMPANIES

MCLEODUSA INCORPORATED

McLeodUSA Technology Park
6400 C Street SW, P.O. Box 3177
Cedar Rapids, Iowa 52406-3177
(319) 790-7800

McLeodUSA provides selected telecommunications services to customers nationwide.
We provide integrated communications services, including local services, in many
Midwest and Rocky Mountain states and long distance and advanced data services
in all 50 states. We are a facilities-based telecommunications provider with 361
ATM switches, 37 voice switches, nearly 824,000 local lines and more than 9,000
employees. We expanded our marketplace for advanced data and Internet services
to all 50 states through our March 30, 2000 acquisition of Splitrock
Services, Inc. The network acquired in the Splitrock transaction is capable of
transmitting integrated next-generation data, video and voice services, reaching
800 cities and 90% of the U.S. population. In the next 12 months, we plan to
distribute 30 million telephone directories in 26 states, serving a population
of 51 million. We are a Nasdaq-100 company traded under the symbol "MCLD."

We offer local, long distance, Internet access, data, voice mail and paging
services from a single company on a single bill. We believe we are the first
company in many of our markets to offer one-stop shopping for communications
services tailored to customers' specific needs.

Our core business is providing communications services in competition with
existing local telephone companies, including:

    - local and long distance services

    - dial and dedicated Internet access

    - higher bandwidth Internet access services, such as digital subscriber line
      (DSL) and cable modem

    - value-added services such as virtual private networks and web hosting

    - bandwidth leasing and colocation services

    - facilities and services dedicated for a particular customer's use

    - telephone and computer sales, leasing, networking, service and
      installation

    - other communications services, including video, cellular, operator,
      payphone, mobile radio, wireless communications and paging services

We also derive revenue from the following services related to our core business:

    - sale of advertising in print and electronic telephone directories

    - traditional local telephone company services in east central Illinois and
      southeast South Dakota

    - telemarketing services

In most of our markets, we compete with the existing local phone company by
leasing its lines and switches. We provide long distance services by using our
own facilities and by leasing capacity from others. We are actively developing
fiber optic communications networks in many of our target local markets to carry
additional communications traffic on our own network. We are actively developing
enhancements to our national network and associated next-generation services to
provide increased control and service quality and a base for growth.

                                       1
<PAGE>
CAPROCK COMMUNICATIONS CORP.

15601 Dallas Parkway, Suite 700
Dallas, Texas 75001
(972) 982-9550

CapRock is a facilities-based integrated communications service provider
primarily to small and medium-sized business and communications carrier
customers in the Southwestern United States. CapRock offers business customers
an integrated bundle of communications products and services including local
exchange, domestic and international long distance, enhanced voice, data,
Internet, DSL and dedicated private line services. Additionally, CapRock offers
its communications-intensive business and carrier customers dark fiber, high
bandwidth dedicated fiber infrastructure, terminating access for domestic and
international long distance and ATM, frame relay and IP data transport services.

CapRock's communications services are provided through resale and over its
fiber, voice and data networks. As of June 30, 2000, the CapRock network covered
approximately 4,500 route miles (including 22 metro fiber loops in key markets).
Additionally, as of June 30, 2000, CapRock provided switch-based competitive
local exchange services in 13 markets. As of June 30, 2000, CapRock had 12 voice
and 17 data switches installed and operational on its network.

                                   THE MERGER

On October 2, 2000, CapRock and McLeodUSA entered into a definitive agreement
and plan of merger pursuant to which McLeodUSA, through a newly-formed,
wholly-owned subsidiary, will acquire 100% of the voting securities of CapRock.
In the transaction, each share of CapRock common stock will be exchanged for
0.3876 of a share of McLeodUSA Class A common stock. The merger agreement
provides that the McLeodUSA subsidiary will merge with and into CapRock so that
CapRock will be the surviving corporation and will be wholly-owned by McLeodUSA.
In connection with the proposed merger, McLeodUSA has agreed to file with the
SEC and use its commercially reasonable efforts to cause to become effective a
registration statement with respect to the exchange of CapRock 12% senior notes
due 2008 for McLeodUSA 12% senior notes due 2008 and with respect to the
exchange of CapRock 11 1/2% senior notes due 2009 for McLeodUSA 11 1/2% senior
notes due 2009.

                                       2
<PAGE>
                         SUMMARY OF THE EXCHANGE OFFER

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THE EXCHANGE OFFER..............  We are offering to exchange $1,000 principal amount of
                                  McLeodUSA 12% senior notes due July 15, 2008, which we
                                  refer to as the McLeodUSA notes, for each $1,000 principal
                                  amount of CapRock's outstanding 12% senior notes due July
                                  15, 2008, which we refer to as the CapRock notes.

                                  In order for your CapRock notes to be exchanged, you must
                                  properly tender them before the exchange offer expires.
                                  All CapRock notes that are validly tendered and not
                                  validly withdrawn will be exchanged. We will issue the
                                  McLeodUSA notes promptly after the exchange offer expires.

                                  You may tender your CapRock notes for exchange in whole or
                                  in part in integral multiples of $1,000 principal amount.

THE MERGER AGREEMENT............  In connection with the proposed merger of CapRock with a
                                  wholly-owned subsidiary of McLeodUSA, we have agreed to
                                  file and to use our commercially reasonable efforts to
                                  cause to become effective with the SEC a registration
                                  statement with respect to the exchange of the CapRock
                                  notes for McLeodUSA notes. We are making the exchange
                                  offer to satisfy our contractual obligations under the
                                  merger agreement. After the exchange offer is completed,
                                  you will no longer be entitled to any exchange with
                                  respect to your CapRock notes.

CONSEQUENCES OF FAILURE TO
EXCHANGE YOUR CAPROCK NOTES.....  Any CapRock notes that are not tendered to us or are not
                                  accepted for exchange will remain outstanding and will
                                  continue to accrue interest in accordance with and
                                  otherwise be entitled to all of the rights and privileges
                                  under the indenture governing the CapRock notes. However,
                                  as of October 27, 2000, CapRock had received the requisite
                                  consents to amend this indenture to, among other things,
                                  eliminate most of the restrictive covenants and reporting
                                  requirements contained in the indenture. CapRock expects
                                  shortly to amend the indenture. Therefore, the holders of
                                  any CapRock notes that remain outstanding after the
                                  exchange offer has been completed will be without the
                                  protection that the deleted restrictive covenants and
                                  reporting requirements gave them. See "The Exchange
                                  Offer--Consent Solicitation; Consequences of Failure to
                                  Tender Your CapRock Notes."

EXPIRATION DATE.................  The exchange offer will expire at 5:00 p.m., New York City
                                  time, on December 5, 2000, unless extended by us, in which
                                  case the term "expiration date" will mean the latest date
                                  and time to which the exchange offer is extended. See "The
                                  Exchange Offer--Expiration Date; Extensions; Amendments."
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                                       3
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CONDITIONS TO THE EXCHANGE
OFFER...........................  The exchange offer is subject to the conditions that:

                                      - CapRock receives the consent of the holders of at
                                      least a majority of the aggregate principal amount of
                                        each of the CapRock notes and the CapRock 11 1/2%
                                        senior notes due 2009 to certain amendments to the
                                        indentures governing such notes, which consents were
                                        received by CapRock as of October 27, 2000

                                      - the proposed merger of CapRock with a wholly-owned
                                        subsidiary of McLeodUSA is consummated

                                  The exchange offer is further subject to several customary
                                  conditions which we may waive. There is no guarantee that
                                  these conditions will be satisfied.

                                  The exchange offer is not conditioned upon any minimum
                                  principal amount of CapRock notes being tendered for
                                  exchange. See "The Exchange Offer--Conditions to the
                                  Exchange Offer."

                                  We reserve the right, subject to applicable law, at any
                                  time and from time to time:

                                      - to delay the acceptance of the CapRock notes

                                      - to terminate the exchange offer if specified
                                      conditions have not been satisfied

                                      - to extend the expiration date of the exchange offer
                                      and retain all tendered CapRock notes subject,
                                        however, to the right of tendering holders to
                                        withdraw their tender of CapRock notes

                                      - to waive any condition or otherwise amend the terms
                                      of the exchange offer in any respect

                                  See "The Exchange Offer--Expiration Date; Extensions;
                                  Amendments."

PROCEDURES FOR TENDERING
CAPROCK NOTES...................  If you wish to tender your CapRock notes for exchange, you
                                  must:

                                      - complete and sign a Letter of Transmittal according
                                      to the instructions contained in the Letter of
                                        Transmittal

                                      - forward the Letter of Transmittal by mail, facsimile
                                        transmission or hand delivery, together with any
                                        other required documents, to the exchange agent,
                                        either with the CapRock notes that you tender or in
                                        compliance with the specified procedures for
                                        guaranteed delivery of your CapRock notes
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                                       4
<PAGE>

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                                  Some brokers, dealers, commercial banks, trust companies
                                  and other nominees may also effect tenders by book-entry
                                  transfer. Please do not send your Letter of Transmittal or
                                  certificates representing your CapRock notes to us. You
                                  should send those documents only to the exchange agent.
                                  You should direct any information requests or questions
                                  regarding how to tender your CapRock notes to the exchange
                                  agent. See "The Exchange Offer--Exchange Agent."

SPECIAL PROCEDURES FOR
BENEFICIAL OWNERS...............  If your CapRock notes are registered in the name of a
                                  broker, dealer, commercial bank, trust company or other
                                  nominee, we urge you to contact such person promptly if
                                  you wish to tender your CapRock notes pursuant to the
                                  exchange offer. See "The Exchange Offer--Procedures for
                                  Tendering CapRock Notes."

WITHDRAWAL RIGHTS...............  You may withdraw the tender of your CapRock notes at any
                                  time before the expiration date by delivering a written
                                  notice of your withdrawal to the exchange agent according
                                  to the withdrawal procedures described under the heading
                                  "The Exchange Offer--Withdrawal Rights."

EXCHANGE AGENT..................  The exchange agent for the exchange offer is United States
                                  Trust Company of New York. The address, telephone number
                                  and facsimile number of the exchange agent are set forth
                                  under the heading "The Exchange Offer--Exchange Agent" and
                                  in the Letter of Transmittal.

USE OF PROCEEDS.................  We will not receive any cash proceeds from the issuance of
                                  the McLeodUSA notes offered by this prospectus. See "Use
                                  of Proceeds."

UNITED STATES FEDERAL INCOME
TAX CONSEQUENCES................  Your acceptance of the exchange offer and the related
                                  exchange of your CapRock notes for McLeodUSA notes should
                                  not cause you to recognize any taxable gain or loss for
                                  federal income tax purposes. See "The Exchange
                                  Offer--United States Federal Income Tax Consequences."

CONSENT SOLICITATION............  On October 11, 2000, CapRock commenced a solicitation of
                                  consents from the holders of the CapRock notes to amend
                                  the indenture under which the CapRock notes were issued
                                  to:

                                      - modify certain restrictive covenants contained in
                                      the indenture in order to permit the merger of CapRock
                                        with a wholly-owned subsidiary of McLeodUSA

                                      - allow the merger of CapRock and the McLeodUSA
                                        subsidiary to be consummated without triggering the
                                        change of control provisions of the indenture

                                      - eliminate most of the restrictive covenants and
                                      reporting requirements contained in the indenture
</TABLE>

                                       5
<PAGE>

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                                  As of October 27, 2000, CapRock had received consents from
                                  holders of a majority to the aggregate principal amount of
                                  the CapRock notes to such amendments.

CONCURRENT EXCHANGE OFFER.......  Concurrently with this exchange offer and by a separate
                                  prospectus, we are offering to exchange our 11 1/2% senior
                                  notes due 2009 for CapRock's 11 1/2% senior notes due
                                  2009. The completion of the exchange offer contemplated by
                                  this prospectus and the concurrent offering of our 11 1/2%
                                  senior notes due 2009 are not dependent on one another.
</TABLE>

See "The Exchange Offer" for more detailed information concerning the terms of
the exchange offer.

                                       6
<PAGE>
                    SUMMARY OF TERMS OF THE MCLEODUSA NOTES

    The exchange offer relates to the exchange of up to $150,000,000 principal
amount of McLeodUSA 12% senior notes due July 15, 2008 for up to an equal
principal amount of CapRock 12% senior notes due July 15, 2008.

<TABLE>
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SECURITIES OFFERED..............  $150 million principal amount of McLeodUSA 12% senior
                                  notes due July 15, 2008.

INTEREST........................  Interest on the McLeodUSA notes will accrue at the rate of
                                  12% per year and will be payable in cash semi-annually in
                                  arrears on January 15 and July 15, commencing on January
                                  15, 2001. Interest on the McLeodUSA notes will be deemed
                                  to accrue from July 15, 2000.

RANKING.........................  The McLeodUSA notes will not be secured by any assets and:

                                      - will be subordinated to all of our existing and
                                      future secured indebtedness, including our Senior
                                        Secured Credit Facilities and any other Senior
                                        Credit Facility or Qualified Receivable Facility,
                                        each as defined in this prospectus

                                      - will be subordinated to all liabilities of our
                                      subsidiaries, including trade payables

                                      - will be effectively subordinated in certain respects
                                      to any CapRock notes and any CapRock 11 1/2% senior
                                        notes due 2009 that remain outstanding after this
                                        exchange offer and our concurrent exchange offer for
                                        CapRock's 11 1/2% senior notes due 2009

                                      - will rank equal in right of payment with all of our
                                      existing and future senior unsecured indebtedness

                                      - will rank senior in right of payment to all of our
                                      existing and future subordinated indebtedness

                                  As of June 30, 2000:

                                      - we and our subsidiaries had total secured
                                      indebtedness of $631.7 million

                                      - our subsidiaries had total liabilities of $700.9
                                        million

                                      - we had $1.7 billion of outstanding senior unsecured
                                        indebtedness that will rank equal in right of
                                        payment with the McLeodUSA notes

                                      - we had no outstanding subordinated indebtedness

                                  See "Description of the McLeodUSA Notes--General."
</TABLE>

                                       7
<PAGE>

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OPTIONAL REDEMPTION.............  We may redeem the McLeodUSA notes at our option, in whole
                                  or in part, at any time on or after July 15, 2003 at the
                                  redemption prices set forth in this prospectus, plus
                                  accrued and unpaid interest, if any, to the date of
                                  redemption. See "Description of the McLeodUSA
                                  Notes--Optional Redemption."

CHANGE OF CONTROL...............  Upon a Change of Control, as defined in this prospectus,
                                  you will have the right to require us to repurchase all or
                                  any part of your McLeodUSA notes at a purchase price equal
                                  to 101% of their principal amount plus accrued and unpaid
                                  interest. However, we cannot assure you we will have the
                                  financial resources necessary to repurchase the McLeodUSA
                                  notes upon a Change of Control. See "Description of the
                                  McLeodUSA Notes--Repurchase at the Option of Holders upon
                                  a Change of Control."

RESTRICTIVE COVENANTS...........  The indenture governing the McLeodUSA notes contains
                                  several covenants which, among other things, restrict our
                                  ability and the ability of our subsidiaries to:

                                      - incur additional indebtedness

                                      - pay dividends

                                      - make distributions in respect of our or our
                                      subsidiaries' capital stock

                                      - make other restricted payments

                                      - enter into sale and leaseback transactions

                                      - pledge or mortgage assets

                                      - enter into transactions with affiliates

                                      - sell assets

                                      - consolidate, merge or sell all or substantially all
                                      of our or our subsidiaries' assets

                                  These covenants are subject to important exceptions and
                                  qualifications. See "Description of the McLeodUSA Notes--
                                  Covenants."
</TABLE>

                                       8
<PAGE>
                COMPARISON OF MCLEODUSA NOTES AND CAPROCK NOTES

<TABLE>
<CAPTION>
                                    MCLEODUSA NOTES                  CAPROCK NOTES
                             ------------------------------  ------------------------------
<S>                          <C>                             <C>
AGGREGATE PRINCIPAL AMOUNT   $150 million                    $150 million

INTEREST RATE                12%                             12%

MATURITY                     July 15, 2008                   July 15, 2008

PAYMENT DATES                January 15 and                  January 15 and
                             July 15                         July 15

RANKING                      The McLeodUSA notes will not    The CapRock notes are not
                             be secured by any assets and    secured by any assets and are
                             will be subordinated to all of  subordinated to all of
                             McLeodUSA's existing and        CapRock's existing and future
                             future secured indebtedness     secured indebtedness and to
                             and to all liabilities of       all liabilities of CapRock's
                             McLeodUSA's subsidiaries. The   subsidiaries. The CapRock
                             McLeodUSA notes will rank       notes rank equal in right of
                             equal in right of payment with  payment with all of CapRock's
                             all of McLeodUSA's existing     existing and future senior
                             and future senior unsecured     unsecured indebtedness and
                             indebtedness and will rank      rank senior in right of
                             senior in right of payment to   payment to all of CapRock's
                             all of McLeodUSA's existing     existing and future
                             and future subordinated         subordinated indebtedness.
                             indebtedness. The McLeodUSA
                             notes will be effectively
                             subordinated in certain
                             respects to any CapRock notes
                             and any CapRock 11 1/2% senior
                             notes due 2009 that remain
                             outstanding after this
                             exchange offer and our
                             concurrent exchange offer for
                             CapRock's 11 1/2% senior notes
                             due 2009.

OPTIONAL REDEMPTION          McLeodUSA may redeem the        CapRock may redeem the CapRock
                             McLeodUSA notes at any time on  notes at any time on or after
                             or after July 15, 2003 at the   July 15, 2003 at the
                             redemption prices set forth in  redemption prices set forth in
                             this prospectus.                this prospectus.

MANDATORY REDEMPTION         None                            None

CHANGE OF CONTROL            Upon a change of control, a     Upon a change of control, a
                             McLeodUSA noteholder will be    CapRock noteholder can require
                             able to require McLeodUSA to    CapRock to repurchase all or
                             repurchase all or any part of   any part of its CapRock notes
                             its McLeodUSA notes at a        at a purchase price equal to
                             purchase price equal to 101%    101% of their principal amount
                             of their principal amount plus  plus accrued and unpaid
                             accrued and unpaid interest.    interest.
</TABLE>

                                       9
<PAGE>

<TABLE>
<CAPTION>
                                  MCLEODUSA NOTES                    CAPROCK NOTES
                          --------------------------------  --------------------------------
<S>                       <C>                               <C>
PUBLIC EQUITY OFFERING    None                              None
AND STRATEGIC EQUITY
SALE OPTIONAL REDEMPTION

RESTRICTIVE COVENANTS     Subject to important exceptions   Subject to important exceptions
                          and qualifications, the           and qualifications, the
                          indenture governing the           indenture governing the CapRock
                          McLeodUSA notes contains several  notes contains several covenants
                          covenants which, among other      which, among other things,
                          things, restrict the ability of   restrict the ability of CapRock
                          McLeodUSA and its subsidiaries    and its subsidiaries to:
                          to:

                          - incur additional indebtedness   - incur additional indebtedness

                          - pay dividends                   - pay dividends

                          - make distributions in respect   - make distributions in respect
                          of capital stock of McLeodUSA or  of capital stock of CapRock or
                            its subsidiaries                  its subsidiaries

                          - make other restricted payments  - make other restricted payments

                          - enter into sale and leaseback   - enter into sale and leaseback
                            transactions                      transactions

                          - pledge or mortgage assets       - pledge or mortgage assets

                          - enter into transactions with    - enter into transactions with
                            affiliates                        affiliates

                          - sell assets                     - sell assets

                          - consolidate, merge or sell all  - consolidate, merge or sell all
                          or substantially all assets of    or substantially all assets of
                            McLeodUSA or its subsidiaries     CapRock or its subsidiaries
</TABLE>

    On October 11, 2000, CapRock commenced a solicitation of consents from the
holders of the CapRock notes to amend the indenture under which the CapRock
notes were issued to (a) modify certain restrictive covenants contained in the
indenture in order to permit the merger of CapRock with a wholly-owned
subsidiary of McLeodUSA, (b) allow the merger of CapRock and the McLeodUSA
subsidiary to be consummated without triggering the change of control provisions
of the indenture and (c) eliminate most of the restrictive covenants and
reporting requirements contained in the indenture. As of October 27, 2000,
CapRock had received consents from holders of a majority of the aggregate
principal amount of the CapRock notes to such amendments.

                                  RISK FACTORS

    You should carefully consider the factors set forth under the caption "Risk
Factors" before tendering your CapRock notes for McLeodUSA notes.

                                       10
<PAGE>
               SELECTED CONSOLIDATED FINANCIAL DATA OF MCLEODUSA

    The information in the following unaudited table is based on historical
financial information included in the prior SEC filings of McLeodUSA, including
the McLeodUSA Annual Report on Form 10-K for the fiscal year ended December 31,
1999 and the Quarterly Report on Form 10-Q for the quarter ended June 30, 2000.
The following summary financial information should be read in connection with
this historical financial information including the notes which accompany such
financial information. This historical financial information is considered a
part of this document. See "Where You Can Find More Information." The audited
historical financial statements of McLeodUSA as of December 31, 1999, 1998 and
1997, and for each of the three years in the period ended December 31, 1999 were
audited by Arthur Andersen LLP, independent public accountants.

    The information in the following table reflects financial information for
the following companies McLeodUSA has acquired:

<TABLE>
<CAPTION>
ACQUIRED COMPANY                                            DATE ACQUIRED
----------------                                            -------------
<S>                                                       <C>
MWR Telecom, Inc........................................    April 28, 1995
Ruffalo, Cody & Associates, Inc.........................    July 15, 1996
Telecom*USA Publishing Group, Inc.......................  September 20, 1996
Consolidated Communications, Inc........................  September 24, 1997
Ovation Communications, Inc.............................    March 31, 1999
Splitrock Services, Inc.................................    March 30, 2000
</TABLE>

    The operations statement data and other financial data in the table include
the operations of these companies beginning on the dates they were acquired. The
balance sheet data in the table include the financial position of these
companies at the end of the periods presented. These acquisitions affect the
comparability of the financial data for the periods presented.

    The pro forma information presented in the operations statement data and
other financial data in the table includes the operations of Ovation, Splitrock
and CapRock as if they had been acquired at the beginning of the periods
presented and the as adjusted information in the balance sheet data in the table
includes the Ovation, Splitrock and CapRock financial position as of the date
presented. The 1999 pro forma amounts include adjustments to the CapRock 1999
historical financial statements to give effect to the issuance by CapRock in May
1999 of $210 million of its 11 1/2% senior notes as if the note issuance had
occurred at the beginning of such period.

    The information in the table also reflects the following debt and equity
securities that McLeodUSA has outstanding:

<TABLE>
<CAPTION>
DESCRIPTION OF SECURITIES                                  PRINCIPAL AMOUNT      DATE ISSUED
-------------------------                                  ----------------      -----------
<S>                                                        <C>                <C>
10 1/2% senior discount notes due March 1, 2007..........    $500 million       March 4, 1997
9 1/4% senior notes due July 15, 2007....................    $225 million       July 21, 1997
8 3/8% senior notes due March 15, 2008...................    $300 million       March 10, 1998
9 1/2% senior notes due November 1, 2008.................    $300 million      October 30, 1998
8 1/8% senior notes due February 15, 2009................    $500 million     February 22, 1999
Series A preferred stock.................................    $287 million      August 23, 1999
Series B preferred stock.................................    $687 million     September 15, 1999
Series C preferred stock.................................    $313 million     September 15, 1999
Senior Secured Credit Facilities.........................    $575 million        May 30, 2000
</TABLE>

    The operations statement data and other financial data in the table include
the effects of the issuances beginning on the dates the securities were issued.
The balance sheet data in the table include the effects of these issuances at
the end of the periods presented. The pro forma information presented in the
operations statement data and other financial data in the table includes the
effects of the

                                       11
<PAGE>
issuance of the 8 1/8% senior notes, the Series A, B and C preferred stock and
the Senior Secured Credit Facilities as if they had occurred at the beginning of
1999.

    On June 30, 1999, McLeodUSA announced that its board of directors had
declared a two-for-one stock split to be effected in the form of a stock
dividend. The record date for the stock split was July 12, 1999. Stockholders of
record at the market close on that date received one additional share of
McLeodUSA Class A common stock for each share held. Distribution of the
additional shares took place on July 26, 1999. On February 29, 2000, McLeodUSA
announced that its board of directors had declared a three-for-one stock split
to be effected in the form of a stock dividend. The record date for the stock
split was April 4, 2000. Stockholders of record at the market close on that date
received two additional shares of McLeodUSA Class A common stock for each share
held. Distribution of the additional shares took place on April 24, 2000. All
information in the selected consolidated financial data has been adjusted to
reflect the two-for-one stock split and the three-for-one stock split.

    The ratio of earnings to fixed charges is calculated as follows: earnings
consist of net loss before income taxes plus fixed charges (excluding
capitalized interest). Fixed charges consist of interest on all debt (including
capitalized interest), amortization of debt discount and deferred loan costs and
the portion of rental expense that is representative of the interest component
of rental expense (deemed to be one-third of rental expense which management
believes is a reasonable approximation of the interest component). For each of
the years ended December 31, 1995, 1996, 1997, 1998 and 1999, earnings were
insufficient to cover fixed charges by $11.4 million, $22.6 million, $84.4
million, $135.5 million, and $243.3 million, respectively. For the six months
ended June 30, 1999 and 2000, earnings were insufficient to cover fixed charges
by $118.5 million and $207.7 million, respectively. On a pro forma basis,
earnings would not have been sufficient to cover fixed charges by $523.3 million
and $313.5 million for the year ended December 31, 1999 and the six months ended
June 30, 2000, respectively.

                                                 (TABLE BEGINS ON THE NEXT PAGE)

                                       12
<PAGE>
               SELECTED CONSOLIDATED FINANCIAL DATA OF MCLEODUSA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                             YEAR ENDED DECEMBER 31,
                                       --------------------------------------------------------------------
                                                                                                 PRO FORMA
                                         1995       1996       1997       1998        1999         1999
                                       --------   --------   --------   ---------   ---------   -----------
                                                                                                (UNAUDITED)
<S>                                    <C>        <C>        <C>        <C>         <C>         <C>
OPERATIONS STATEMENT DATA:
  Revenue............................  $ 28,998   $ 81,323   $267,886   $ 604,146   $ 908,792   $1,210,667
                                       --------   --------   --------   ---------   ---------   ----------
  Operating expenses:
    Cost of service..................    19,667     52,624    151,190     323,208     457,085      699,401
    Selling, general and
      administrative.................    18,054     46,044    148,158     260,931     392,687      481,488
    Depreciation and amortization....     1,835      8,485     33,275      89,107     190,695      346,131
    Other............................        --      2,380      4,632       5,575          --           --
                                       --------   --------   --------   ---------   ---------   ----------
    Total operating expenses.........    39,556    109,533    337,255     678,821   1,040,467    1,527,020
  Operating loss.....................   (10,558)   (28,210)   (69,369)    (74,675)   (131,675)    (316,353)
  Interest income (expense), net.....      (771)     5,369    (11,967)    (52,234)    (94,244)    (191,068)
  Other income.......................        --        495      1,426       1,997       5,637        7,163
  Income taxes.......................        --         --         --          --          --           --
                                       --------   --------   --------   ---------   ---------   ----------
  Net loss...........................   (11,329)   (22,346)   (79,910)   (124,912)   (220,282)    (500,528)
  Preferred stock dividends..........        --         --         --          --     (17,727)     (54,375)
                                       --------   --------   --------   ---------   ---------   ----------
  Loss applicable to common stock....  $(11,329)  $(22,346)  $(79,910)  $(124,912)  $(238,009)  $ (554,633)
                                       ========   ========   ========   =========   =========   ==========
  Loss per common share..............  $   (.07)  $   (.09)  $   (.24)  $    (.33)  $    (.54)  $     (.99)
                                       ========   ========   ========   =========   =========   ==========
  Weighted average common shares
    outstanding......................   168,024    243,036    329,844     376,842     443,130      559,751
                                       ========   ========   ========   =========   =========   ==========
  Ratio of earnings to fixed
    charges..........................        --         --         --          --          --           --
                                       ========   ========   ========   =========   =========   ==========
</TABLE>

<TABLE>
<CAPTION>
                                                                     SIX MONTHS ENDED JUNE 30,
                                                              ---------------------------------------
                                                                                           PRO FORMA
                                                                 1999          2000          2000
                                                              -----------   -----------   -----------
                                                              (UNAUDITED)   (UNAUDITED)   (UNAUDITED)
<S>                                                           <C>           <C>           <C>
OPERATIONS STATEMENT DATA:
  Revenue...................................................   $ 403,771     $ 620,082     $ 769,055
                                                               ---------     ---------     ---------
  Operating expenses:
    Cost of service.........................................     205,507       344,426       466,226
    Selling, general and administrative.....................     178,339       256,563       309,973
    Depreciation and amortization...........................      78,708       163,193       213,415
    Other...................................................          --            --           872
                                                               ---------     ---------     ---------
    Total operating expenses................................     462,554       764,182       990,486
  Operating loss............................................     (58,783)     (144,100)     (221,431)
  Interest income (expense), net............................     (50,666)      (42,077)      (70,486)
  Other income..............................................         562         1,971         1,996
  Income taxes..............................................          --            --            --
                                                               ---------     ---------     ---------
  Net loss..................................................    (108,887)     (184,206)     (289,921)
  Preferred stock dividends.................................          --       (27,204)      (27,204)
                                                               ---------     ---------     ---------
  Loss applicable to common stock...........................   $(108,887)    $(211,410)    $(317,125)
                                                               =========     =========     =========
  Loss per common share.....................................   $    (.26)    $    (.40)    $    (.54)
                                                               =========     =========     =========
  Weighted average common shares outstanding................     423,210       529,109       590,221
                                                               =========     =========     =========
  Ratio of earnings to fixed charges........................          --            --            --
                                                               =========     =========     =========
</TABLE>

                                       13
<PAGE>
               SELECTED CONSOLIDATED FINANCIAL DATA OF MCLEODUSA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                 DECEMBER 31,                                JUNE 30, 2000
                          ----------------------------------------------------------   -------------------------
                            1995       1996        1997         1998         1999        ACTUAL       PRO FORMA
                          --------   --------   ----------   ----------   ----------   -----------   -----------
                                                                                       (UNAUDITED)   (UNAUDITED)
<S>                       <C>        <C>        <C>          <C>          <C>          <C>           <C>
BALANCE SHEET DATA:
  Current assets........  $ 8,507    $224,401   $  517,869   $  793,192   $1,569,473   $1,647,070    $1,879,002
  Working capital
    (deficit)...........  $(1,208)   $185,968   $  378,617   $  613,236   $1,272,794   $  859,997    $  913,955
  Property and
    equipment, net......  $16,119    $ 92,123   $  373,804   $  629,746   $1,270,032   $1,897,962    $2,321,001
  Total assets..........  $28,986    $452,994   $1,345,652   $1,925,197   $4,203,147   $7,069,543    $7,791,496
  Long-term debt........  $ 3,600    $  2,573   $  613,384   $1,245,170   $1,763,725   $2,370,370    $2,718,588
  Redeemable convertible
    preferred stock.....  $    --    $     --   $       --   $       --   $1,000,000   $1,000,000    $1,000,000
  Stockholders'
    equity..............  $14,958    $403,429   $  559,379   $  462,806   $1,108,542   $2,878,436    $3,074,207
</TABLE>

<TABLE>
<CAPTION>
                                                       YEAR ENDED DECEMBER 31,
                                  ------------------------------------------------------------------
                                                                                          PRO FORMA
                                    1995       1996       1997       1998       1999        1999
                                  --------   --------   --------   --------   --------   -----------
                                                                                         (UNAUDITED)
<S>                               <C>        <C>        <C>        <C>        <C>        <C>
OTHER FINANCIAL DATA:
  Capital expenditures
    Property, plant and
      equipment.................  $ 6,364    $ 79,845   $179,255   $289,923   $580,003   $  820,756
    Business acquisitions.......  $ 8,333    $ 93,937   $421,882   $ 49,737   $736,626   $3,376,180
  EBITDA(1) ....................  $(8,723)   $(17,345)  $(31,462)  $ 20,007   $ 59,020   $   29,778
</TABLE>

<TABLE>
<CAPTION>
                                                                   SIX MONTHS ENDED JUNE 30,
                                                            ---------------------------------------
                                                                                         PRO FORMA
                                                               1999          2000          2000
                                                            -----------   -----------   -----------
                                                            (UNAUDITED)   (UNAUDITED)   (UNAUDITED)
<S>                                                         <C>           <C>           <C>
OTHER FINANCIAL DATA:
  Capital expenditures
    Property, plant and equipment.........................    $220,390    $  559,834    $  804,163
    Business acquisitions.................................    $525,161    $2,052,925    $2,415,523
  EBITDA(1) ..............................................    $ 19,925    $   19,093    $   (7,144)
</TABLE>

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

(1) EBITDA consists of operating loss before depreciation, amortization and
    other nonrecurring operating expenses. McLeodUSA has included EBITDA data
    because it is a measure commonly used in the industry. EBITDA is not a
    measure of financial performance under generally accepted accounting
    principles and should not be considered an alternative to net income as a
    measure of performance or to cash flows as a measure of liquidity.

                                       14
<PAGE>
                SELECTED CONSOLIDATED FINANCIAL DATA OF CAPROCK
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

    The following table sets forth financial data as of and for the years ended
December 31, 1995, 1996, 1997, 1998 and 1999 and as of and for the six months
ended June 30, 1999 and 2000. The business combination among CapRock's
predecessor companies was completed on August 26, 1998 and was accounted for as
a pooling of interests. Accordingly, these Consolidated Financial Statements
include CapRock's three predecessor companies (CapRock Telecommunications Corp.,
CapRock Fiber Network, LTD. and IWL Communications, Incorporated) as though
these entities were always a part of CapRock.

    In May 1998, IWL Communications changed its fiscal year end to coincide with
the fiscal years of CapRock, CapRock Telecommunications and CapRock Fiber. The
Consolidated Statement of Operations for the year ended December 31, 1996
combines the operating activity of IWL Communications for the year ended June
30, 1996 with the operating activity of CapRock Telecommunications and CapRock
Fiber for the year ended December 31, 1996. The net income of IWL Communications
in the amount of approximately $260,000 for the six month period ended December
31, 1996 was excluded from the Consolidated Statement of Operations for the year
ended December 31, 1996 as a result of the non-conforming year ends for such
period. This amount was included as an adjustment to retained earnings in the
Consolidated Statement of Stockholders' Equity and Comprehensive Income in 1997.
IWL Communications' cash flow for this period was added to the 1997 beginning
balance in the Consolidated Statement of Cash Flows.

<TABLE>
<CAPTION>
                                                                   AS OF AND FOR THE YEAR ENDED DECEMBER 31,
                                                              ----------------------------------------------------
                                                                1995       1996       1997       1998       1999
                                                              --------   --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenues....................................................  $29,407    $50,970    $75,349    $121,774   $192,623
Costs of Services...........................................   21,185     39,357     52,471      83,221    115,676
                                                              -------    -------    -------    --------   --------
    Gross profit............................................    8,222     11,613     22,878      38,553     76,947
Operating expenses:
  Selling, general and administrative.......................    7,326      8,983     14,074      23,528     56,535
  Merger related expenses...................................       --         --         --       2,313         --
  Depreciation and amortization.............................    1,186      1,536      3,346       4,887      9,698
                                                              -------    -------    -------    --------   --------
    Total operating expenses................................    8,512     10,519     17,420      30,728     66,233
                                                              -------    -------    -------    --------   --------
Operating income (loss).....................................     (290)     1,094      5,458       7,825     10,714
Interest expense, net.......................................     (484)      (585)    (1,603)     (6,441)   (17,861)
Other income (expense)......................................      151         42        220         106      1,526
                                                              -------    -------    -------    --------   --------
Income (loss) before income taxes and extraordinary item....     (623)       551      4,075       1,490     (5,621)
Income tax expense (benefit)................................       48        227      1,513       1,267     (2,080)
                                                              -------    -------    -------    --------   --------
Income (loss) before extraordinary item.....................     (671)       324      2,562         223     (3,541)
Extraordinary item -- extinguishment of debt................      645         --         --          --         --
                                                              -------    -------    -------    --------   --------
    Net income (loss).......................................  $   (26)   $   324    $ 2,562    $    223   $ (3,541)
                                                              =======    =======    =======    ========   ========
Pro forma net income (loss):
  Income (loss) before income taxes and extraordinary
    item....................................................  $  (623)   $   551    $ 4,075    $  1,490   $ (5,621)
  Pro forma income taxes, as if CapRock Fiber were a C
    corporation.............................................     (211)       143      1,475       1,267     (2,080)
                                                              -------    -------    -------    --------   --------
  Income (loss) before extraordinary item...................     (412)       408      2,600         223     (3,541)
  Extraordinary item, net of taxes..........................      397         --         --          --         --
                                                              -------    -------    -------    --------   --------
    Pro forma net income (loss).............................  $   (15)   $   408    $ 2,600    $    223   $ (3,541)
                                                              =======    =======    =======    ========   ========
Historical and pro forma income (loss) per common share:
  Income (loss) before extraordinary item...................  $ (0.02)   $  0.01    $  0.09    $   0.01   $  (0.11)
  Extraordinary item, net of tax............................  $  0.02         --         --          --         --
                                                              -------    -------    -------    --------   --------
  Basic and diluted.........................................  $    --    $  0.01    $  0.09    $   0.01   $  (0.11)
                                                              =======    =======    =======    ========   ========
Weighted average shares outstanding:
  Basic.....................................................   25,926     27,146     27,984      28,899     31,727
  Diluted...................................................   25,936     27,156     28,481      30,028     31,727
</TABLE>

                                       15
<PAGE>
                SELECTED CONSOLIDATED FINANCIAL DATA OF CAPROCK
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                SIX MONTHS ENDED
                                                                    JUNE 30,
                                                              --------------------
                                                                1999       2000
                                                              --------   ---------
<S>                                                           <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenues....................................................  $ 74,596   $ 113,936
Costs of Services...........................................    44,919      79,220
                                                              --------   ---------
    Gross profit............................................    29,677      34,716
Operating expenses:
  Selling, general and administrative.......................    25,012      43,398
  Merger related expenses...................................        --          --
  Depreciation and amortization.............................     3,337       9,077
                                                              --------   ---------
    Total operating expenses................................    28,349      52,475
                                                              --------   ---------
Operating income (loss).....................................     1,328     (17,759)
Interest expense, net.......................................    (7,134)     (7,021)
Other income (expense)......................................      (135)         25
                                                              --------   ---------
Income (loss) before income taxes and extraordinary item....    (5,941)    (24,755)
Income tax expense (benefit)................................    (2,335)     (9,118)
                                                              --------   ---------
Income (loss) before extraordinary item.....................    (3,606)    (15,637)
Extraordinary item--extinguishment of debt..................        --          --
                                                              --------   ---------
    Net income (loss).......................................  $  3,606   $ (15,637)
                                                              ========   =========
Pro forma net income (loss):
  Income (loss) before income taxes and extraordinary
    item....................................................  $ (5,941)  $ (24,755)
  Pro forma income taxes, as if CapRock Fiber were a C
    corporation.............................................    (2,335)     (9,118)
                                                              --------   ---------
  Income (loss) before extraordinary item...................    (3,606)    (15,637)
  Extraordinary item, net of taxes..........................        --          --
                                                              --------   ---------
    Pro forma net income (loss).............................  $ (3,606)  $ (15,637)
                                                              ========   =========
Historical and pro forma income (loss) per common share:
  Income (loss) before extraordinary item...................  $  (0.12)  $   (0.47)
  Extraordinary item, net of tax............................        --          --
                                                              --------   ---------
  Basic and diluted.........................................  $  (0.12)  $   (0.47)
                                                              ========   =========
Weighted average shares outstanding:
  Basic.....................................................    30,321      33,406
  Diluted...................................................    30,321      33,406
</TABLE>

                                       16
<PAGE>
                SELECTED CONSOLIDATED FINANCIAL DATA OF CAPROCK
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                      AS OF AND FOR THE YEAR ENDED DECEMBER 31,
                                                ------------------------------------------------------
                                                  1995       1996       1997       1998        1999
                                                --------   --------   --------   ---------   ---------
<S>                                             <C>        <C>        <C>        <C>         <C>
BALANCE SHEET DATA:
Working capital (deficit).....................  $  (797)   $ (2,153)  $   (305)  $ 102,489   $ 216,145
Property, plant and equipment, net............    6,705      15,901     27,341      59,607     228,601
Total assets..................................   13,198      28,522     49,389     191,966     548,835
Long-term debt and capital lease
  obligations.................................    2,443      13,254     21,062     145,187     347,502
Stockholders' equity..........................    3,552       3,886     14,086      16,062      96,030

OPERATING DATA:
EBITDA(1) ....................................  $   896    $  2,630   $  8,804   $  15,025   $  20,412
Cash flows provided by (used in) operations...      827         781      4,112       7,125     (13,302)
Cash flows used in investing activities.......   (1,919)     (9,350)   (12,987)   (134,350)   (264,623)
Cash flows provided by financing activities...      903       8,605     12,114     123,990     283,338
Capital expenditures..........................   (2,282)    (10,212)   (13,631)    (36,855)   (201,289)
</TABLE>

<TABLE>
<CAPTION>
                                                                SIX MONTHS ENDED
                                                                    JUNE 30,
                                                              ---------------------
                                                                1999        2000
                                                              ---------   ---------
<S>                                                           <C>         <C>
BALANCE SHEET DATA:
Working capital (deficit)...................................  $ 337,555   $ 104,312
Property, plant and equipment, net..........................     97,360     423,039
Total assets................................................    479,533     676,174
Long-term debt and capital lease obligations................    347,012     348,218
Stockholders' equity........................................     94,939     177,738

OPERATING DATA:
EBITDA(1) ..................................................  $  (4,665)  $  (8,682)
Cash flows provided by (used in) operations.................    (14,897)     50,799
Cash flows used in investing activities.....................   (258,169)   (159,910)
Cash flows provided by financing activities.................    283,872     107,113
Capital expenditures........................................    (45,717)   (216,263)
</TABLE>

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

(1) EBITDA consists of operating income or loss before interest, income taxes,
    depreciation and amortization and other nonrecurring operating expenses.
    EBITDA is a measure commonly used in the communications industry. EBITDA is
    not a measure of financial performance under generally accepted accounting
    principles and should not be considered as an alternative to net income as a
    measure of performance nor as an alternative to cash flow as a measure of
    liquidity.

                                       17
<PAGE>
                                  RISK FACTORS

    YOU SHOULD CAREFULLY CONSIDER THE FOLLOWING RISK FACTORS BEFORE TENDERING
YOUR CAPROCK NOTES FOR MCLEODUSA NOTES. YOU SHOULD ALSO CONSIDER THE OTHER
INFORMATION IN THIS PROSPECTUS, INCLUDING THE SEC REPORTS ON FORMS 10-K, 10-Q
AND 8-K AND IN THE OTHER DOCUMENTS CONSIDERED A PART OF THIS PROSPECTUS. SEE
"WHERE YOU CAN FIND MORE INFORMATION." THE TERMS "WE," "US," "OUR" OR OTHER
VARIATIONS THEREOF, AS USED IN THIS "RISK FACTORS" SECTION, REFER TO MCLEADUSA
AND ITS SUBSIDIARIES UNLESS THE CONTEXT REQUIRES A DIFFERENT MEANING.

WE MAY NOT BE ABLE TO SUCCESSFULLY INTEGRATE ACQUIRED COMPANIES, INCLUDING
CAPROCK, INTO OUR OPERATIONS, WHICH COULD SLOW OUR GROWTH.

    The integration of acquired companies, including the proposed acquisition of
CapRock, into our operations involves a number of risks, including:

    - difficulty integrating operations and personnel

    - diversion of management attention

    - potential disruption of ongoing business

    - inability to retain key personnel

    - inability to successfully incorporate acquired assets and rights into our
      service offerings

    - inability to maintain uniform standards, controls, procedures and policies

    - impairment of relationships with employees, customers or vendors

    Failure to overcome these risks or any other problems encountered in
connection with the merger or other similar transactions could slow our growth
or lower the quality of our services, which could reduce customer demand and
have a negative impact upon the price at which the McLeodUSA notes trade after
this exchange offer.

CONTINUED RAPID GROWTH OF OUR NETWORK, SERVICES AND SUBSCRIBERS COULD BE SLOWED
IF WE CANNOT MANAGE THIS GROWTH.

    We have rapidly expanded and developed our network, services and
subscribers. This has placed and will continue to place, in part as a result of
the merger, significant demands on our management, operational and financial
systems and procedures and controls. We may not be able to manage our
anticipated growth effectively, which could harm our business, results of
operations and financial condition. Further expansion and development will
depend on a number of factors, including:

    - cooperation of existing local telephone companies

    - regulatory, legislative and other governmental developments

    - changes in the competitive climate in which we operate

    - development of customer billing, order processing and network management
      systems

    - availability of financing

    - technological developments

    - availability of rights-of-way, franchises, building access and antenna
      sites

    - existence of strategic alliances or relationships

    - emergence of future opportunities

    We will need to continue to improve our operational and financial systems
and our procedures and controls as we grow. We must also develop, train and
manage our employees.

WE EXPECT TO INCUR SIGNIFICANT LOSSES OVER THE NEXT SEVERAL YEARS.

    If we do not become profitable in the future, we could have difficulty
obtaining funds to continue our operations or repay the McLeodUSA notes. We have
incurred net losses every year since we began operations. Since

                                       18
<PAGE>
January 1, 1995, our net losses applicable to common stock have been as follows:

<TABLE>
<CAPTION>
PERIOD                             AMOUNT
------                             ------
<S>                            <C>
1995.........................  $ 11.3 million
1996.........................  $ 22.3 million
1997.........................  $ 79.9 million
1998.........................  $124.9 million
1999.........................  $238.0 million
First 6 months of 2000.......  $211.4 million
</TABLE>

    We expect to incur significant operating losses during the next several
years while we develop our business and expand our fiber optic communications
network.

FAILURE TO RAISE NECESSARY CAPITAL COULD RESTRICT OUR ABILITY TO DEVELOP OUR
NETWORK AND SERVICES AND ENGAGE IN STRATEGIC ACQUISITIONS.

    We need significant capital to continue to expand our operations,
facilities, network and services including, following the merger, the expansion
and operation of CapRock. We cannot assure you that our capital resources will
permit us to fund our planned network deployment and operations or achieve
operating profitability. Failure to generate or raise sufficient funds may
require us to delay or abandon some of our expansion plans or expenditures,
which could harm our business and competitive position.

    As of June 30, 2000, based on the combined McLeodUSA and CapRock business
plans, capital requirements and growth projections as of that date, we estimated
that we would require approximately $1.7 billion through 2002 to fund our
planned capital expenditures and operating expenses. We expect to meet these
funding needs through the existing cash balances of McLeodUSA and CapRock, our
existing lines of credit and income from future operations. Our estimated
aggregate capital requirements include the projected costs of:

    - expanding its fiber optic communications network, including national and
      intra-city fiber optic networks

    - adding voice and ATM switches

    - expanding operations in existing and new markets

    - developing wireless services in limited markets

    - funding general corporate expenses

    - completing recent acquisitions, including the merger

    - constructing, acquiring, developing or improving telecommunications assets

    Our estimate of future capital requirements is a "forward-looking statement"
within the meaning of the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995. The actual amount and timing of our future
capital requirements may differ substantially from our estimate due to factors
such as:

    - strategic acquisition costs and effects of acquisitions on our business
      plan, capital requirements and growth projections

    - unforeseen delays

    - cost overruns

    - engineering design changes

    - changes in demand for our services

    - regulatory, technological or competitive developments

    - new opportunities

    We also expect to evaluate potential acquisitions, joint ventures and
strategic alliances on an ongoing basis. We may require additional financing if
we pursue any of these opportunities.

    Our projected funding plan assumes that (a) the indentures governing the
CapRock notes and the CapRock 11 1/2% senior notes due 2009 are amended to
provide that the acquisition of CapRock does not constitute a change of control
and (b) such notes will either remain outstanding as amended to remove various
covenants or be exchanged for a like principal amount of our notes pursuant to
the terms of the exchange offers.

    We may meet any additional capital needs by issuing additional debt or
equity securities or borrowing funds from one or more lenders. We cannot assure
you that we will have timely access to additional financing sources on
acceptable terms. If we do not, we may not be able to expand our markets,
operations, facilities,

                                       19
<PAGE>
network and services as we intend. See "Information About McLeodUSA."

OUR HIGH LEVEL OF DEBT COULD LIMIT OUR FLEXIBILITY IN RESPONDING TO BUSINESS
DEVELOPMENTS AND PUT US AT A COMPETITIVE DISADVANTAGE.

    We have substantial debt, which could adversely affect us in a number of
ways, including:

    - limiting our ability to obtain necessary financing in the future

    - limiting our flexibility to plan for, or react to, changes in our business

    - requiring us to use a substantial portion of our cash flow from operations
      to pay debt rather than for other purposes, such as working capital or
      capital expenditures

    - making us more highly leveraged than some of our competitors, which may
      place us at a competitive disadvantage

    - making us more vulnerable to a downturn in our business

    As of June 30, 2000, we had $2.4 billion of long-term debt, including $1.7
billion of debt under our senior notes and $575 million under our credit
facilities. We also had $1.0 billion of redeemable convertible preferred stock
and $2.9 billion of stockholders' equity. In addition, upon completion of the
merger and the exchange offers, we expect to have $360 million of long-term debt
resulting from the exchange of McLeodUSA notes for the CapRock notes and the
exchange of our 11 1/2% senior notes due 2009 for the CapRock 11 1/2% senior
notes due 2009. As a result, we expect our fixed charges to exceed our earnings
for the foreseeable future.

COVENANTS IN DEBT INSTRUMENTS RESTRICT OUR CAPACITY TO BORROW AND INVEST, WHICH
COULD IMPAIR OUR ABILITY TO EXPAND OR FINANCE OUR OPERATIONS.

    The indentures governing the terms of our long-term debt impose operating
and financial restrictions. In addition, under the terms of our credit
facilities, we have granted a security interest in substantially all of our and
our subsidiaries' assets. These restrictions and encumbrances limit our
discretion in some business matters, which could make it more difficult for us
to expand, finance our operations or engage in other business activities that
may be in our interest. These restrictions limit or prohibit our ability to:

    - incur additional debt

    - pay dividends or make other distributions

    - make investments or other restricted payments

    - enter into sale and leaseback transactions

    - pledge, mortgage or permit liens upon assets

    - enter into transactions with affiliates

    - sell assets

    - consolidate, merge or sell all or substantially all of our assets

    If we fail to comply with these restrictions, all of our long-term debt
could become immediately due and payable.

OUR DEPENDENCE ON THE MEGABELLS TO PROVIDE MOST OF OUR COMMUNICATIONS SERVICES
COULD MAKE IT MORE DIFFICULT FOR US TO OFFER OUR SERVICES AT A PROFIT.

    The original seven regional Bell operating companies that resulted from the
divestiture by AT&T in 1984 of its local telephone systems are now concentrated
into four large incumbent "MegaBells." We depend on these MegaBells to provide
most of our core local and some of our long distance services. Today, without
using the communications facilities of these companies, we could not provide
bundled local and long distance services to most of our customers. Because of
this dependence, our communications services are highly susceptible to changes
in the conditions for access to these facilities and to inadequate service
quality provided by the MegaBells, and therefore we may have difficulty offering
our services on a profitable and competitive basis.

    Qwest Communications International Inc. (successor to U S WEST
Communications, Inc.) and SBC Communications Inc. (including its wholly-owned
subsidiary Ameritech Corporation) are our primary suppliers of local lines to
our customers and communications services that

                                       20
<PAGE>
allow us to transfer and connect calls. Upon completion of the merger, BellSouth
will also become our supplier. The communications facilities of the MegaBells
allow us to provide local service, long distance service and private lines
dedicated to our customers' use. If the MegaBells or other companies deny or
limit our access to their communications network elements or wholesale services,
we may not be able to offer our communications services at profitable rates.

    Our plan to provide local service using our own communications network
equipment also depends on the MegaBells. In order to interconnect our network
equipment and other communications facilities to network elements controlled by
the MegaBells, we must first negotiate and enter into interconnection agreements
with them. Interconnection obligations imposed on the MegaBells by the
Telecommunications Act of 1996 have been and continue to be subject to a variety
of legal proceedings, the outcome of which could affect our ability to obtain
interconnection agreements on acceptable terms. There can be no assurance that
we will succeed in obtaining interconnection agreements on terms that would
permit usto offer local services using our own communications network facilities
at profitable and competitive rates.

ACTIONS BY THE MEGABELLS MAY MAKE IT MORE DIFFICULT FOR US TO OFFER OUR
COMMUNICATIONS SERVICES.

    The MegaBells have pursued several measures that may make it more difficult
for us to offer our communications services. For example, in February 1996, U S
WEST, which has since been acquired by Qwest, filed tariffs and other notices
with the public utility commissions in its fourteen-state service region to
limit future Centrex access to its switches. Centrex access allows us to
aggregate lines, have control over several characteristics of those lines and
provide a set of standard features on those lines. We use Qwest's Centrex
services to provide most of our local communications services in Qwest's service
territories.

    In January 1997, U S WEST proposed interconnection surcharges in several of
the states in its service region, which would increase our costs in providing
communications services in those states.

    In addition, during the past year Qwest filed proposals with the Iowa
Utilities Board to reduce the retail prices charged by Qwest for various
business services which, if approved, would have the effect of reducing our
margins on competitive local business services in Iowa.

    We have challenged or are challenging these actions before the FCC or
applicable state public utility commissions. We cannot assure you we will
succeed in our challenges to these or other actions by Qwest that would prevent
or deter us from using Qwest's Centrex service or communications network
elements. If Qwest successfully withdraws or limits our access to Centrex
services in any jurisdiction, we may not be able to offer communications
services in that jurisdiction, which could harm our business.

    We anticipate that Qwest will also pursue legislation in states within our
target market area to reduce state regulatory oversight over its rates and
operations. If adopted, these initiatives could make it more difficult for us to
challenge Qwest's actions in the future.

    SBC/Ameritech has also introduced measures that may make it more difficult
for us to offer certain types of communications services. For example, in 1998
and 1999, Ameritech assessed extra special construction charges to install
service for customers when we leased a line from them. Ameritech did not assess
comparable charges to retail customers that ordered service directly from SBC/
Ameritech, which put us at a disadvantage. We have challenged or are challenging
these actions by SBC/Ameritech before the applicable state public utility
commissions. Though we have succeeded in three such challenges, there can be no
assurance that we will succeed in our challenges to these or other actions by
SBC/ Ameritech that would prevent or deter us from competing with them. If
SBC/Ameritech can successfully charge us extraordinary costs to install service
when it does not assess the same charges to retail customers, we may not be able
to offer communications services in that location, which would harm our
business.

                                       21
<PAGE>
COMPETITION IN THE COMMUNICATIONS SERVICES INDUSTRY COULD CAUSE US TO LOSE
CUSTOMERS AND REVENUE AND COULD MAKE IT MORE DIFFICULT FOR US TO ENTER NEW
MARKETS.

    We face intense competition in all of our markets. This competition could
result in loss of customers and lower our revenue. It could also make it more
difficult for us to enter new markets. Existing local telephone companies,
including Qwest, SBC/Ameritech, BellSouth and Verizon, currently dominate their
local telecommunications markets. Three major competitors, AT&T, WorldCom and
Sprint, dominate the long distance market. Hundreds of other companies also
compete in the long distance marketplace. AT&T, WorldCom and Sprint also offer
local telecommunications services in many locations.

    Our local and long distance services also compete with the services of other
communications services companies competing with the existing local telephone
companies in some markets.

    Other competitors may include cable television companies, providers of
communications network facilities dedicated to particular customers, microwave
and satellite carriers, wireless telecommunications providers, private networks
owned by large end-users, and telecommunications management companies.

    These and other firms may enter the markets where we focus our sales
efforts, which may create downward pressure on the prices for our services and
negatively affect our returns. Many of our existing and potential competitors
have financial and other resources far greater than ours. In addition, the trend
toward mergers and strategic alliances in the communications industry may
strengthen some of our competitors and could put us at a significant competitive
disadvantage.

IF THE MEGABELLS ARE ALLOWED TO OFFER BUNDLED LOCAL AND LONG DISTANCE SERVICES
IN OUR MARKETS IT COULD CAUSE US TO LOSE CUSTOMERS AND REVENUES AND COULD MAKE
IT MORE DIFFICULT FOR US TO ENTER NEW MARKETS.

    Presently the MegaBells are prohibited from offering interLATA long distance
services to customers in their regions until they have shown compliance with the
Telecommunications Act of 1996. The MegaBells are attempting to show compliance
and are seeking authority to offer in-region interLATA long distance service.
Southwestern Bell has obtained such authority in Texas.

    If the MegaBells, which have resources far greater than ours, are authorized
to bundle interLATA long distance service and local service in our markets
before the MegaBells' local markets are effectively open to competition, such an
offering by the MegaBells could cause McLeodUSA to lose customers and revenues
and make it more difficult for us to compete in those markets.

WE MAY NOT SUCCEED IN DEVELOPING OR MAKING A PROFIT FROM WIRELESS SERVICES.

    Our effort to offer wireless services involves a high degree of risk and
will impose significant demands on our management and financial resources.
Developing wireless services may require us to, among other things, spend
substantial time and money to acquire, build and test a wireless infrastructure
and enter into roaming arrangements with wireless operators in other markets.
Our business plan does not currently include substantial funds for the
development of wireless services. In order to offer wireless services on a
widespread basis, we would need to obtain additional funding by issuing
additional debt or equity securities or by borrowing funds from one or more
lenders. We may not succeed in developing wireless services. Even if we spend
substantial amounts to develop wireless services, we may not make a profit from
wireless operations.

    Our ability to successfully offer wireless services will also depend on a
number of factors beyond our control, including:

    - changes in communications service rates charged by other companies

    - changes in the supply and demand for wireless services due to competition
      with other wireline and wireless operators in the same geographic area

                                       22
<PAGE>
    - changes in the federal, state or local regulatory requirements affecting
      the operation of wireless systems

    - changes in wireless technologies that could render obsolete the technology
      and equipment we choose for our wireless services

COMPETITION IN THE WIRELESS TELECOMMUNICATIONS INDUSTRY COULD MAKE IT MORE
DIFFICULT FOR US TO SUCCESSFULLY OFFER WIRELESS SERVICES.

    The wireless telecommunications industry is experiencing increasing
competition and significant technological change. This will make it more
difficult for us to gain a share of the wireless communications market. We
expect up to eight wireless competitors in each of our potential target wireless
markets. We could face additional competition from mobile satellite services.

    Many of our potential wireless competitors have financial and other
resources far greater than ours and have more experience testing new or improved
products and services. In addition, several wireless competitors operate or plan
to operate wireless telecommunications systems that encompass most of the United
States, which could give them a significant competitive advantage, particularly
if we offer only regional wireless services.

THE SUCCESS OF OUR COMMUNICATIONS SERVICES WILL DEPEND ON OUR ABILITY TO KEEP
PACE WITH RAPID TECHNOLOGICAL CHANGES IN OUR INDUSTRY.

    Communications technology is changing rapidly. These changes influence the
demand for our services. We need to be able to anticipate these changes and to
develop new and enhanced products and services quickly enough for the changing
market. This will determine whether we can continue to increase our revenue and
number of subscribers and remain competitive.

THE LOSS OF KEY PERSONNEL COULD WEAKEN OUR TECHNICAL AND OPERATIONAL EXPERTISE,
DELAY OUR INTRODUCTION OF NEW SERVICES OR ENTRY INTO NEW MARKETS AND LOWER THE
QUALITY OF OUR SERVICES.

    We may not be able to attract, develop, motivate and retain experienced and
innovative personnel. There is intense competition for qualified personnel in
our lines of business. The loss of the services of key personnel, or the
inability to attract additional qualified personnel, could cause us to make less
successful strategic decisions, which could hinder the introduction of new
services or the entry into new markets. We could also be less prepared for
technological or marketing problems, which could reduce our ability to serve its
customers and lower the quality of our services. As a result, our financial
condition could be adversely affected.

    Our future success depends on the continued employment of our senior
management team, particularly Clark E. McLeod, the Chairman and Chief Executive
Officer of McLeodUSA, Stephen C. Gray, the President and Chief Operating Officer
of McLeodUSA and the President and Chief Executive Officer of the Local Services
operations of McLeodUSA, and Roy A. Wilkens, the Chief Technology Officer of
McLeodUSA and the President and Chief Executive Officer of the Network and Data
Services operations of McLeodUSA.

FAILURE TO OBTAIN AND MAINTAIN NECESSARY PERMITS AND RIGHTS-OF-WAY COULD DELAY
INSTALLATION OF OUR NETWORKS AND INTERFERE WITH OUR OPERATIONS.

    To obtain access to rights-of-way needed to install our fiber optic cable,
we must reach agreements with state highway authorities, local governments,
transit authorities, local telephone companies and other utilities, railroads,
long distance carriers and other parties. The failure to obtain or maintain any
rights-of-way could delay our planned network expansion, interfere with our
operations and harm our business. For example, if we lose access to a
right-of-way, we may need to spend significant sums to remove and relocate our
facilities.

GOVERNMENT REGULATION MAY INCREASE OUR COST OF PROVIDING SERVICES, SLOW OUR
EXPANSION INTO NEW MARKETS AND SUBJECT OUR SERVICES TO ADDITIONAL COMPETITIVE
PRESSURES.

    Our facilities and services are subject to federal, state and local
regulations. The time and expense of complying with these regulations could slow
down our expansion into new

                                       23
<PAGE>
markets, increase our costs of providing services and subject us to additional
competitive pressures. One of the primary purposes of the Telecommunications Act
of 1996 was to open the local telephone services market to competition. While
this has presented us with opportunities to enter local telephone markets, it
also provides important benefits to the existing local telephone companies, such
as the ability, under specified conditions, to provide out-of-region long
distance service to customers in their respective regions. In addition, we need
to obtain and maintain licenses, permits and other regulatory approvals in
connection with some of our services. Any of the following could harm our
business:

    - failure to maintain proper federal and state tariffs

    - failure to maintain proper state certifications

    - failure to comply with federal, state or local laws and regulations

    - failure to obtain and maintain required licenses and permits

    - burdensome license or permit requirements to operate in public rights-
      of-way

    - burdensome or adverse regulatory requirements

    - delays in obtaining or maintaining required authorizations

WE DEPEND UPON PAYMENTS FROM OUR SUBSIDIARIES TO PAY PRINCIPAL AND INTEREST ON
OUR DEBT OBLIGATIONS.

    We are a holding company, which means we conduct all of our operations and
derive all of our operating income from our subsidiaries. Our ability to pay our
obligations, including our obligation to pay principal and interest on the
McLeodUSA notes, depends on receiving dividends and other payments from our
subsidiaries, raising additional funds in a public or private equity or debt
offering or selling assets. Our subsidiaries constitute separate legal entities
and have no obligation to pay any amounts due on the McLeodUSA notes or to make
funds available to us. Our subsidiaries' ability to pay dividends or make other
payments or advances to us will depend on their operating results and the
requirements of applicable law.

THE MCLEODUSA NOTES ARE SUBORDINATE TO OUR SUBSIDIARIES' OBLIGATIONS AND OUR OWN
SECURED OBLIGATIONS.

    The McLeodUSA notes will be effectively subordinated in right of payment to
all liabilities of our subsidiaries. This means that in the event of a
bankruptcy, liquidation or reorganization, our subsidiaries must pay their
creditors in full before we could use their assets to pay you. As of June 30,
2000, our subsidiaries had total liabilities after the elimination of loans and
advances from us to our subsidiaries of approximately $700.9 million. In
addition, the indenture governing the McLeodUSA notes and the indentures
governing our 10 1/2% senior discount notes, 9 1/4% senior notes, 8 3/8% senior
notes, 9 1/2% senior notes and 8 1/8% senior notes, which we refer to
collectively as our indentures, permit us and our subsidiaries to incur
additional debt.

    The McLeodUSA notes will be unsecured and will be subordinated to our
secured debt. This means if we default on any of our secured debt, our secured
creditors could foreclose on their collateral and receive payment out of the
proceeds of that collateral before we could use those assets to pay you. If the
value of the collateral is less than the amount owed, our secured creditors will
have equal rights with you to our remaining assets. As of June 30, 2000, we had
total secured debt of approximately $631.7 million. The indentures permit us and
our subsidiaries to incur additional secured debt, including unlimited purchase
money debt.

THERE IS NO ESTABLISHED TRADING MARKET FOR THE MCLEODUSA NOTES WHICH COULD MAKE
IT MORE DIFFICULT FOR YOU TO SELL MCLEODUSA NOTES AND COULD ADVERSELY AFFECT
THEIR PRICE.

    The McLeodUSA notes constitute a new issue of securities for which no
established trading market exists. Consequently, it may be more difficult for
you to sell McLeodUSA notes. If McLeodUSA notes are traded after their initial
issuance, they may trade at a discount, depending upon:

    - our financial condition

                                       24
<PAGE>
    - prevailing interest rates

    - the market for similar securities

    - other factors beyond our control, including general economic conditions

    We do not intend to apply for a listing or quotation of McLeodUSA notes on
any securities exchange. We cannot assure you of the development or liquidity of
any trading market for the McLeodUSA notes following the exchange offer.

HOLDERS OF CAPROCK NOTES WHO FAIL TO TENDER MAY EXPERIENCE DIMINISHED LIQUIDITY
AFTER THE EXCHANGE OFFER.

    We have not conditioned the exchange offer on receipt of any minimum or
maximum principal amount of CapRock notes. As CapRock notes are tendered and
accepted in the exchange offer, the principal amount of remaining CapRock notes
will decrease. This decrease will reduce the liquidity of the trading market for
the CapRock notes which may make it more difficult for you to sell them. We
cannot assure you of the liquidity, or even the continuation, of the trading
market for the CapRock notes following the exchange offer.

HOLDERS OF CAPROCK NOTES WHO FAIL TO TENDER WILL HAVE FEWER RIGHTS UNDER THE
CAPROCK INDENTURE FOLLOWING EFFECTIVENESS OF THE PROPOSED AMENDMENTS TO THE
CAPROCK INDENTURE.

    On October 11, 2000, CapRock commenced a solicitation of consents from the
holders of the CapRock notes to amend the indenture under which the CapRock
notes were issued. As of October 27, 2000, CapRock had received consents from
holders of a majority of the aggregate principal amount of the CapRock notes to
such amendments. CapRock expects shortly to amend the indenture, which is a
condition to consummation of the exchange offer. Upon the effectiveness of the
amendments, the CapRock notes will no longer be entitled to the benefits of
certain restrictive covenants and certain other provisions of the indenture that
will have been eliminated by the amendments. The CapRock indenture, as so
amended, will continue to govern the terms of all CapRock notes that remain
outstanding after the amendments are operative. The elimination of these
restrictive covenants and other provisions will permit CapRock to, among other
things, incur indebtedness, pay dividends and make other restricted payments,
incur liens and make investments which would otherwise not have been permitted
under the CapRock indenture. It is possible that any such actions that CapRock
will be permitted to take as a result of the changes to the CapRock indenture
will increase the risk with respect to the CapRock notes.

THE OBLIGATION TO MAKE PAYMENTS UNDER THE CAPROCK NOTES THAT REMAIN OUTSTANDING
AFTER THE EXCHANGE OFFER WILL REMAIN WITH CAPROCK.

    As a result of the proposed merger of our wholly-owned subsidiary into
CapRock, CapRock will become our wholly-owned subsidiary. In addition,
notwithstanding the merger, CapRock will remain the obligor under the CapRock
indenture and any CapRock notes that remain outstanding after consummation of
the exchange offer. Neither we nor any of our subsidiaries, other than CapRock,
will guarantee or otherwise agree to pay the interest on or repay the principal
amount of the CapRock notes. Holders will have no direct claim against us or any
of our subsidiaries, other than CapRock, for payment under the CapRock indenture
and the CapRock notes.

                                       25
<PAGE>
              CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

    This prospectus and the information incorporated by reference in it include
"forward-looking statements" within the meaning of Section 27A of the Securities
Act and Section 21E of the Securities Exchange Act. We intend the
forward-looking statements to be covered by the safe harbor provisions for
forward-looking statements in these sections. All statements regarding our
expected financial position and operating results, our business strategy, our
financing plans, our future capital requirements, forecasted demographic and
economic trends relating to our industry, our ability to complete acquisitions,
including the merger of CapRock with a subsidiary of McLeodUSA, to realize
anticipated cost savings and other benefits from acquisitions and to recover
acquisition-related costs, and similar matters are forward-looking statements.
These statements are subject to known and unknown risks, uncertainties and other
factors that could cause events or our actual results to differ materially from
the statements. The forward-looking information is based on various factors and
was derived using numerous assumptions. In some cases, you can identify these
statements by our use of forward-looking words such as "may," "will," "should,"
"anticipate," "estimate," "expect," "plan," "believe," "predict," "potential" or
"intend." You should be aware that these statements only reflect our
predictions. Actual events or results may differ substantially. Important
factors that could cause events or our actual results to be materially different
from our expectations include those discussed in this prospectus under the
caption "Risk Factors" and those discussed in documents incorporated by
reference in this prospectus. We undertake no obligation to update or revise
publicly any forward-looking statements, whether as a result of new information,
future events or otherwise.

                                       26
<PAGE>
                               THE EXCHANGE OFFER

PURPOSE AND EFFECT OF THE EXCHANGE OFFER

    In connection with the proposed merger of CapRock with a wholly-owned
subsidiary of McLeodUSA, we have agreed to file and to use our commercially
reasonable efforts to cause to become effective with the SEC a registration
statement with respect to the exchange of the CapRock notes for McLeodUSA notes.
A copy of the merger agreement has been filed as an exhibit to the registration
statement of which this prospectus is a part. We are making the exchange offer
to satisfy our contractual obligations under the merger agreement.

    If you tender your CapRock notes in exchange for McLeodUSA notes, you will
represent to us that:

    - you have full power and authority to tender, exchange, sell, assign and
      transfer the tendered CapRock notes

    - we will acquire good, marketable and unencumbered title to the CapRock
      notes you tender, free and clear of all liens, restrictions, charges and
      encumbrances

    - the CapRock notes you tender for exchange are not subject to any adverse
      claims or proxies (other than consents or proxies granted in connection
      with the consent solicitation currently being conducted by CapRock)

    You also will warrant and agree that you will, upon request, execute and
deliver any additional documents deemed by us or the exchange agent to be
necessary or desirable to complete the exchange, sale, assignment and transfer
of the CapRock notes you tender in the exchange offer.

    The exchange offer is not being made to, nor will we accept tenders for
exchange from, holders of CapRock notes in any jurisdiction in which the
exchange offer or the acceptance thereof would not be in compliance with the
securities or blue sky laws of such jurisdiction.

    Unless the context requires otherwise, the term "holder" or "noteholder"
with respect to the exchange offer means any person in whose name the CapRock
notes are registered on CapRock's books or any other person who has obtained a
properly completed bond power from the registered holder, or any participant in
DTC whose name appears on a security position listing as a holder of CapRock
notes, which, for purposes of the exchange offer, include beneficial interests
in the CapRock notes held by direct or indirect participants in DTC and CapRock
notes held in definitive form.

TERMS OF THE EXCHANGE OFFER

    We hereby offer, upon the terms and subject to the conditions set forth in
this prospectus and in the accompanying Letter of Transmittal, to exchange
$1,000 principal amount of McLeodUSA notes for each $1,000 principal amount of
CapRock notes properly tendered prior to the expiration date and not properly
withdrawn according to the procedures described below. Holders may tender their
CapRock notes in whole or in part in integral multiples of $1,000 principal
amount.

    The exchange offer is not conditioned upon any minimum principal amount of
CapRock notes being tendered for exchange. We reserve the right to purchase or
make offers for any CapRock notes that remain outstanding after the expiration
date or, as set forth under "--Conditions to the Exchange Offer," to terminate
the exchange offer and, to the extent permitted by applicable law, purchase
CapRock notes in the open market, in privately negotiated transactions or
otherwise. The terms of any such purchases or offers could differ from the terms
of the exchange offer. As of the date of this prospectus, $150 million principal
amount of CapRock notes is outstanding.

    Holders of CapRock notes do not have any appraisal or dissenters' rights in
connection with the exchange offer. CapRock notes which are not tendered for, or
are tendered but not accepted in connection with, the exchange offer will remain
outstanding. For a description of the consequences of

                                       27
<PAGE>
not tendering CapRock notes for exchange, see "--Consent Solicitation;
Consequences of Failure to Tender Your CapRock Notes."

    If any tendered CapRock notes are not accepted for exchange because of an
invalid tender, the occurrence of other events set forth in this prospectus or
otherwise, certificates for the unaccepted CapRock notes will be returned,
without expense, to the tendering holder of those notes promptly after the
expiration date.

    Holders who tender CapRock notes in connection with the exchange offer will
not be required to pay brokerage commissions or fees or, subject to the
instructions in the Letter of Transmittal, transfer taxes with respect to the
exchange of CapRock notes in connection with the exchange offer. We will pay all
charges and expenses, other than applicable taxes described below, in connection
with the exchange offer. See "--Fees and Expenses" for a description of the fees
and expenses that we will pay in connection with the exchange offer.

    Neither the McLeodUSA nor the CapRock board of directors makes any
recommendation to holders of CapRock notes as to whether to tender or refrain
from tendering all or any portion of their CapRock notes in the exchange offer.
In addition, no one has been authorized to make any similar recommendation.
Holders of CapRock notes must make their own decision whether to tender in the
exchange offer and, if so, the aggregate amount of CapRock notes to tender after
reading this prospectus and the Letter of Transmittal and consulting with their
advisors, if any, based on their financial position and requirements.

EXPIRATION DATE; EXTENSIONS; AMENDMENTS

    The term "expiration date" means 5:00 p.m., New York City time, on
December 5, 2000, unless we extend the exchange offer, in which case the term
"expiration date" shall mean the latest date and time to which the exchange
offer is extended.

    We expressly reserve the right in our sole discretion, subject to applicable
law, at any time and from time to time,

    - to delay the acceptance of the CapRock notes for exchange

    - to terminate the exchange offer, whether or not any CapRock notes have
      been accepted for exchange, if we determine, in our sole discretion, that
      any of the events or conditions referred to under "--Conditions to the
      Exchange Offer" has occurred or exists or has not been satisfied

    - to extend the expiration date of the exchange offer and retain all CapRock
      notes tendered in the exchange offer, subject, however, to the right of
      holders of CapRock notes to withdraw their tendered CapRock notes as
      described under "--Withdrawal Rights"

    - to waive any condition or otherwise amend the terms of the exchange offer
      in any respect

    If the exchange offer is amended in a manner that we determine to constitute
a material change, or if we waive a material condition of the exchange offer, we
will promptly disclose such amendment or waiver by means of a prospectus
supplement that will be distributed to the registered holders of the CapRock
notes, and we will extend the exchange offer to the extent required by
Rule 14e-1 under the Securities Exchange Act.

    Any delay in acceptance, termination, extension or amendment will be
followed promptly by:

    - oral or written notice of the change to the exchange agent, with any such
      oral notice to be promptly confirmed in writing

    - a public announcement of the change, which announcement, in the case of an
      extension, will be made no later than 9:00 a.m., New York City time, on
      the next business day after the previously scheduled expiration date

                                       28
<PAGE>
    Without limiting the manner in which we may choose to make any public
announcement, and subject to applicable laws, we shall have no obligation to
publish, advertise or otherwise communicate any such public announcement other
than by issuing a release to an appropriate news agency.

ACCEPTANCE FOR EXCHANGE AND ISSUANCE OF MCLEODUSA NOTES

    Upon the terms and subject to the conditions of the exchange offer, promptly
after the expiration date we will exchange, and will issue to the exchange
agent, McLeodUSA notes for CapRock notes validly tendered and not withdrawn as
described under "--Withdrawal Rights."

    In all cases, delivery of McLeodUSA notes in exchange for CapRock notes
tendered and accepted for exchange in the exchange offer will be made only after
timely receipt by the exchange agent of:

    - CapRock notes or a book-entry confirmation of a book-entry transfer of
      CapRock notes into the exchange agent's account at DTC

    - the Letter of Transmittal, or a facsimile of the letter, properly
      completed and duly executed, with any required signature guarantees

    - any other documents required by the Letter of Transmittal

    Accordingly, the delivery of McLeodUSA notes might not be made to all
tendering holders at the same time, and will depend upon when CapRock notes,
book-entry confirmations with respect to CapRock notes and other required
documents are received by the exchange agent.

    The term "book-entry confirmation" means a timely confirmation of a
book-entry transfer of CapRock notes into the exchange agent's account at DTC.

    Subject to the terms and conditions of the exchange offer, we will be deemed
to have accepted for exchange, and thereby exchanged, CapRock notes validly
tendered and not withdrawn as, if and when we give oral or written notice to the
exchange agent of our acceptance of those CapRock notes for exchange in the
exchange offer. Any such oral notice shall be promptly confirmed in writing. Our
acceptance for exchange of CapRock notes tendered through any of the procedures
described above will constitute a binding agreement between the tendering holder
and us upon the terms and subject to the conditions of the exchange offer. The
exchange agent will act as our agent for the purpose of receiving tenders of
CapRock notes, Letters of Transmittal and related documents, and as agent for
tendering holders for the purpose of receiving CapRock notes, Letters of
Transmittal and related documents and transmitting McLeodUSA notes to holders
who validly tendered CapRock notes. The exchange will be made promptly after the
expiration date. If for any reason whatsoever the acceptance for exchange or the
exchange of any CapRock notes tendered in the exchange offer is delayed, whether
before or after our acceptance for exchange of CapRock notes, or we extend the
exchange offer or are unable to accept for exchange or exchange CapRock notes
tendered in the exchange offer, then, without prejudice to our rights set forth
in this prospectus, the exchange agent may, nevertheless, on our behalf and
subject to Rule 14e-1(c) under the Securities Exchange Act, retain tendered
CapRock notes and such CapRock notes may not be withdrawn except to the extent
tendering holders are entitled to withdrawal rights as described under
"--Withdrawal Rights."

CONSENT SOLICITATION; CONSEQUENCES OF FAILURE TO TENDER YOUR CAPROCK NOTES

    On October 11, 2000, CapRock commenced a solicitation of consents from the
holders of the CapRock notes to amend the indenture under which the CapRock
notes were issued to (a) modify certain restrictive covenants contained in the
indenture in order to permit the merger of CapRock with a wholly-owned
subsidiary of McLeodUSA, (b) allow the merger of CapRock and the McLeodUSA
subsidiary to be consummated without triggering the change of control provisions
of the indenture and (c) eliminate most of the restrictive covenants and
reporting requirements contained in the indenture.

                                       29
<PAGE>
As of October 27, 2000, CapRock had received consents from holders of a majority
of the aggregate principal amount of the CapRock notes to such amendments.

    Any CapRock notes that are not tendered to us or are not accepted for
exchange will remain outstanding and will continue to accrue interest in
accordance with and otherwise be entitled to all of the rights and privileges
under the indenture governing the CapRock notes. CapRock expects shortly to
amend the indenture as summarized in the preceding paragraph and the holders of
any CapRock notes that remain outstanding after the exchange offer will be
without the protection that the deleted restrictive covenants and reporting
requirements gave them. The elimination of these restrictive covenants and other
provisions will permit CapRock to, among other things, incur indebtedness, pay
dividends and make other restricted payments, incur liens and make investments
which would otherwise not have been permitted under the CapRock indenture. It is
possible that any such actions that CapRock will be permitted to take as a
result of the changes to the CapRock indenture will increase the risk with
respect to the CapRock notes.

    Notwithstanding the merger, CapRock will remain the obligor under the
CapRock indenture and any CapRock notes that remain outstanding after
consummation of the exchange offer.

CONCURRENT EXCHANGE OFFER

    Concurrently with this exchange offer and by a separate prospectus, we are
offering to exchange our 11 1/2% senior notes due 2009 for CapRock's 11 1/2%
senior notes due 2009. We refer to this exchange offer as the "Concurrent
Exchange Offer." The completion of the exchange offer contemplated by this
prospectus and the Concurrent Exchange Offer are not dependent on one another.

PROCEDURES FOR TENDERING CAPROCK NOTES

    VALID TENDER.  Except as set forth below, in order for CapRock notes to be
validly tendered in the exchange offer, either:

    1.  before the expiration date,

       - a properly completed and duly executed Letter of Transmittal, or
         facsimile of the letter with any required signature guarantees and any
         other required documents, must be received by the exchange agent at the
         address set forth under "--Exchange Agent," and

       - tendered CapRock notes must be received by the exchange agent, or such
         CapRock notes must be tendered according to the procedures for
         book-entry transfer described below and a book-entry confirmation must
         be received by the exchange agent, or

    2.  the guaranteed delivery procedures set forth below must be complied
       with.

    If less than all of the CapRock notes are being tendered, a tendering holder
should fill in the amount of CapRock notes being tendered in the appropriate box
on the Letter of Transmittal. The entire amount of CapRock notes delivered to
the exchange agent will be deemed to have been tendered unless otherwise
indicated.

    If any Letter of Transmittal, endorsement, bond power, power of attorney, or
any other document required by the Letter of Transmittal is signed by a trustee,
executor, administrator, guardian, attorney-in-fact, officer of a corporation or
other person acting in a fiduciary or representative capacity, such person
should so indicate when signing, and unless waived by us, evidence satisfactory
to us, in our sole discretion, of such person's authority to so act must be
submitted.

    Any beneficial owner of CapRock notes that are held by or registered in the
name of a broker, dealer, commercial bank, trust company or other nominee or
custodian is urged to contact such entity promptly if such beneficial owner
wishes to participate in the exchange offer.

                                       30
<PAGE>
    The method of delivery of CapRock notes, the Letter of Transmittal and all
other required documents is at the option and sole risk of the tendering holder,
and delivery will be deemed made only when actually received by the exchange
agent. Instead of delivery by mail, we recommend that holders use an overnight
or hand delivery service. In all cases, holders should allow sufficient time to
assure timely delivery and should obtain proper insurance. No Letter of
Transmittal or CapRock notes should be sent to McLeodUSA. Holders may request
their respective brokers, dealers, commercial banks, trust companies or nominees
to effect these transactions for them.

    BOOK-ENTRY TRANSFER.  The exchange agent will make a request to establish an
account with respect to the CapRock notes at DTC for purposes of the exchange
offer within two business days after the date of this prospectus. Any financial
institution that is a participant in DTC's book-entry transfer facility system
may make a book-entry delivery of the CapRock notes by causing DTC to transfer
those CapRock notes into the exchange agent's account at DTC according to DTC's
procedures for transfers. However, although delivery of CapRock notes may be
effected through book-entry transfer into the exchange agent's account at DTC,
the Letter of Transmittal, or facsimile of the letter, properly completed and
duly executed, with any required signature guarantees and any other required
documents, must in any case be delivered to and received by the exchange agent
at its address set forth under "--Exchange Agent" before the expiration date, or
the guaranteed delivery procedure set forth below must be complied with.

DELIVERY OF DOCUMENTS TO DTC DOES NOT CONSTITUTE DELIVERY TO THE EXCHANGE AGENT.

    SIGNATURE GUARANTEES.  Tendering holders do not need to endorse their
certificates for CapRock notes and signature guarantees on a Letter of
Transmittal or a notice of withdrawal, as the case may be, are unnecessary
unless:

    1.  a certificate for CapRock notes is registered in a name other than that
       of the person surrendering the certificate, or

    2.  a registered holder completes the box entitled "Special Issuance
       Instructions" or "Special Delivery Instructions" in the Letter of
       Transmittal

In either of these cases, the certificates for CapRock notes must be duly
endorsed or accompanied by a properly executed bond power, with the endorsement
or signature on the bond power and on the Letter of Transmittal or the notice of
withdrawal, as the case may be, guaranteed by a firm or other entity identified
in Rule 17Ad-15 under the Securities Exchange Act as an "eligible guarantor
institution," including, as such terms are defined in that rule:

    - a bank

    - a broker, dealer, municipal securities broker or dealer or government
      securities broker or dealer

    - a credit union

    - a national securities exchange, registered securities association or
      clearing agency

    - a savings association that is a participant in a Securities Transfer
      Association

unless surrendered on behalf of such eligible institution. See the instructions
to the Letter of Transmittal.

    GUARANTEED DELIVERY.  If a holder desires to tender CapRock notes in the
exchange offer and the certificates for the CapRock notes are not immediately
available or time will not permit all required documents to reach the exchange
agent before the expiration date, or the procedures for book-entry transfer
cannot be completed on a timely basis, the CapRock notes may nevertheless be
tendered, provided that all of the following guaranteed delivery procedures are
complied with:

    - the tenders are made by or through an eligible institution

                                       31
<PAGE>
    - before the expiration date, the exchange agent receives from the eligible
      institution a properly completed and duly executed Notice of Guaranteed
      Delivery, substantially in the form accompanying the Letter of
      Transmittal, stating the name and address of the holder of CapRock notes
      and the amount of CapRock notes tendered, stating that the tender is being
      made by the notice and guaranteeing that within three New York Stock
      Exchange trading days after the date of execution of the Notice of
      Guaranteed Delivery, the certificates for all physically tendered CapRock
      notes, in proper form for transfer, or a book-entry confirmation, as the
      case may be, and any other documents required by the Letter of Transmittal
      will be deposited by the eligible institution with the exchange agent. The
      Notice of Guaranteed Delivery may be delivered by hand, or transmitted by
      facsimile or mail to the exchange agent and must include a guarantee by an
      eligible institution in the form set forth in the Notice of Guaranteed
      Delivery

    - the certificates (or book-entry confirmation) representing all tendered
      CapRock notes, in proper form for transfer, together with a properly
      completed and duly executed Letter of Transmittal, with any required
      signature guarantees and any other documents required by the Letter of
      Transmittal, are received by the exchange agent within three New York
      Stock Exchange trading days after the date of execution of the Notice of
      Guaranteed Delivery

    DETERMINATION OF VALIDITY.  All questions as to the form of documents,
validity, eligibility, including time of receipt, and acceptance for exchange of
any tendered CapRock notes will be determined by us, and that determination
shall be final and binding on all parties. We reserve the right to reject any
and all tenders that we determine are not in proper form or the acceptance for
exchange of which may, in the view of our counsel, be unlawful. We also reserve
the right, subject to applicable law, to waive any of the conditions of the
exchange offer as set forth under "--Conditions to the Exchange Offer" or any
defect or irregularity in any tender of CapRock notes of any particular holder
whether or not we waive similar defects or irregularities in the case of other
holders.

    Our interpretation of the terms and conditions of the exchange offer,
including the Letter of Transmittal and its instructions, will be final and
binding on all parties. No tender of CapRock notes will be deemed to have been
validly made until all defects or irregularities with respect to such tender
have been cured or waived. Neither we, any of our affiliates, the exchange agent
or any other person shall be under any duty to give any notification of any
defects or irregularities in tenders or incur any liability for failure to give
any such notification.

WITHDRAWAL RIGHTS

    Except as otherwise provided herein, tenders of CapRock notes may be
withdrawn at any time before the expiration date.

    In order for a withdrawal to be effective, a written, telegraphic or
facsimile transmission of such notice of withdrawal must be timely received by
the exchange agent at its address set forth under "--Exchange Agent" before the
expiration date. Any notice of withdrawal must specify the name of the person
who tendered the CapRock notes to be withdrawn, the principal amount of CapRock
notes to be withdrawn and, if certificates for such CapRock notes have been
tendered, the name of the registered holder of the CapRock notes as set forth on
the certificates, if different from that of the person who tendered the CapRock
notes.

    If certificates for CapRock notes have been delivered or otherwise
identified to the exchange agent, the notice of withdrawal must specify the
serial numbers on the particular certificates for the CapRock notes to be
withdrawn and the signature on the notice of withdrawal must be guaranteed by an
eligible institution, except in the case of CapRock notes tendered for the
account of an eligible institution.

    If CapRock notes have been tendered by the procedures for book-entry
transfer set forth in "--Procedures for Tendering CapRock Notes," the notice of
withdrawal must specify the name and

                                       32
<PAGE>
number of the account at DTC to be credited with the withdrawal of CapRock notes
and must otherwise comply with the procedures of DTC. Withdrawals of tenders of
CapRock notes may not be rescinded. CapRock notes properly withdrawn will not be
deemed validly tendered for purposes of the exchange offer, but may be
retendered at any subsequent time before the expiration date by following any of
the procedures described above under "--Procedures for Tendering CapRock Notes."

    All questions as to the validity, form and eligibility, including time of
receipt, of such withdrawal notices will be determined by us, which
determination shall be final and binding on all parties. Neither we, any of our
affiliates, the exchange agent or any other person shall be under any duty to
give any notification of any defects or irregularities in any notice of
withdrawal or incur any liability for failure to give any such notification. Any
CapRock notes which have been tendered but which are withdrawn will be returned
to the holder of those notes promptly after withdrawal.

INTEREST ON THE MCLEODUSA NOTES

    Interest on the McLeodUSA notes will be payable semi-annually in arrears on
January 15 and July 15 of each year at a rate of 12% per annum, commencing
January 15, 2001. Interest on the McLeodUSA notes will be deemed to accrue from
July 15, 2000.

CONDITIONS TO THE EXCHANGE OFFER

    Notwithstanding any other provisions of the exchange offer or any extension
of the exchange offer, we will not be required to accept for exchange, or to
exchange, any CapRock notes for any McLeodUSA notes and will not be required to
issue McLeodUSA notes in exchange for any CapRock notes and, as described below,
may, at any time and from time to time, terminate or amend the exchange offer,
whether or not any CapRock notes have been accepted for exchange, or may waive
any conditions to or amend the exchange offer, if any of the following
conditions have occurred or exists or have not been satisfied before the
expiration date:

    - CapRock has not received sufficient consents to amend the indentures
      governing each of the CapRock notes and the CapRock 11 1/2% senior notes
      due 2009 to (a) modify certain restrictive covenants contained in both
      indentures in order to permit the merger of CapRock with a wholly-owned
      subsidiary of McLeodUSA, (b) allow the merger of CapRock and the McLeodUSA
      subsidiary to be consummated without triggering the change of control
      provisions of both indentures and (c) eliminate most of the restrictive
      covenants and reporting requirements contained in both indentures

    - the merger of CapRock with the wholly-owned subsidiary of McLeodUSA has
      not occurred

    - any action or proceeding shall have been instituted or threatened in any
      court or by or before any governmental agency or body with respect to the
      exchange offer or the acquisition of CapRock which, in our judgment, would
      reasonably be expected to impair our ability to proceed with the exchange
      offer or the acquisition of CapRock

    - any law, statute, rule or regulation shall have been adopted or enacted
      which, in our judgment, would reasonably be expected to impair our ability
      to proceed with the exchange offer or the acquisition of CapRock

    - a stop order shall have been issued by the SEC or any state securities
      authority suspending the effectiveness of the registration statement of
      which this prospectus is a part, or proceedings shall have been initiated
      or, to our knowledge, threatened for that purpose

    - any governmental approval has not been obtained, which approval we shall,
      in our judgment, deem necessary for the consummation of the exchange offer
      as contemplated hereby or the acquisition of CapRock

                                       33
<PAGE>
    - any change, or any development involving a prospective change, in our
      business or financial affairs has occurred which, in our judgment, might
      materially impair our ability to proceed with the exchange offer or the
      acquisition of CapRock

    If we determine that any of the foregoing events or conditions has occurred
or exists or has not been satisfied at any time prior to the expiration date, we
may, subject to applicable law, terminate the exchange offer, whether or not any
CapRock notes have been accepted for exchange, or may waive any such condition
or otherwise amend the terms of the exchange offer in any respect. If such
waiver or amendment constitutes a material change to the exchange offer, we will
promptly disclose such waiver or amendment by means of a prospectus supplement
that will be distributed to the registered holders of the CapRock notes, and we
will extend the exchange offer to the extent required by Rule 14e-1 under the
Securities Exchange Act.

    As of October 27, 2000, CapRock had received consents from holders of a
majority of the aggregate principal amount of each of the CapRock notes and the
CapRock 11 1/2% senior notes due 2009 to the amendments to such notes decribed
above.

UNITED STATES FEDERAL INCOME TAX CONSEQUENCES

    The following discussion summarizes, subject to the limitations set forth
below, certain U.S. federal income tax consequences of the exchange offer. The
discussion is based upon provisions of the U.S. Internal Revenue Code of 1986,
as amended (the "Code"), its legislative history, judicial authority, current
administrative rulings and practice, and existing and proposed Treasury
Regulations, all as in effect and existing on the date of this prospectus.
Legislative, judicial or administrative changes or interpretations may be
forthcoming that could alter or modify the validity of the statements and
conclusions set forth below. Any such changes or interpretations may be
retroactive and could adversely affect an exchanging noteholder. This discussion
assumes that the CapRock notes and the McLeodUSA notes are held as capital
assets (as defined in Section 1221 of the Code) by the noteholders. This
discussion applies only to a person who is (a) a citizen or resident of the
United States for United States federal income tax purposes, (b) treated as a
corporation, partnership or other entity created or organized in or under the
laws of the United States or of any political subdivision thereof, (c) an estate
the income of which is subject to United States federal income taxation
regardless of its source, (d) a trust that is subject to the primary supervision
of a court within the United States and the control of a United States person as
described in Section 7701(a)(30) of the Code, or (e) a trust that has a valid
election in effect under applicable Treasury Regulations to be treated as a
United States person (each, a "U.S. Holder"). This discussion does not purport
to deal with all aspects of U.S. federal income taxation that might be relevant
to particular noteholders in light of their personal investment circumstances or
status, nor does it discuss the U.S. federal income tax consequences to certain
types of noteholders subject to special treatment under the U.S. federal income
tax laws, such as certain financial institutions, insurance companies,
corporations that accumulate earnings to avoid federal income tax, dealers in
securities or foreign currency, traders in securities that elect to apply a
mark-to-market method of accounting, tax-exempt organizations, or persons that
hold CapRock notes that are a hedge against, or that are hedged against,
currency risk or that are part of a straddle or conversion transaction, or
persons whose functional currency is not the U.S. dollar. Moreover, the effect
of any applicable state, local or foreign tax laws is not discussed.

    If CapRock notes are held by a partnership, the tax treatment of a partner
will generally depend upon the status of the partner and the activities of the
partnership. Partners of partnerships holding CapRock notes should consult their
tax advisors.

    THE FOLLOWING DISCUSSION IS FOR GENERAL INFORMATION ONLY. EACH HOLDER OF
CAPROCK NOTES IS STRONGLY URGED TO CONSULT WITH ITS OWN TAX ADVISORS TO
DETERMINE THE IMPACT OF SUCH NOTEHOLDER'S PERSONAL TAX SITUATION ON THE

                                       34
<PAGE>
ANTICIPATED TAX CONSEQUENCES OF THE EXCHANGE OFFER, INCLUDING THE TAX
CONSEQUENCES UNDER STATE, LOCAL, FOREIGN OR OTHER TAX LAWS.

    THE MERGER.  As explained above, in connection with the proposed merger of
CapRock with a wholly-owned subsidiary of McLeodUSA, we have entered into a
merger agreement pursuant to which we agreed to file and use our commercially
reasonable efforts to cause to become effective with the SEC a registration
statement with respect to the exchange of the CapRock notes for McLeodUSA notes.
For federal income tax purposes, we believe that the merger and the exchange
offer should be treated as occurring under a single integrated plan.

    The obligation of CapRock to consummate the merger is conditioned upon the
receipt by CapRock of the opinion of Munsch Hardt Kopf & Harr, P.C., counsel to
CapRock, that on the basis of the facts, representations and assumptions set
forth or referred to in such opinion, for U.S. federal income tax purposes, the
merger will qualify as a tax free reorganization under Section 368(a) of the
Code, and that each of McLeodUSA and CapRock will be a party to the
reorganization within the meaning of Section 368(b) of the Code. However,
CapRock has not requested nor will it request an advance ruling from the
Internal Revenue Service as to the tax consequences of the merger, and there can
be no assurance that the Internal Revenue Service will agree with the
conclusions set forth in this opinion.

    FEDERAL INCOME TAX CONSEQUENCES TO EXCHANGING NOTEHOLDERS.  The federal
income tax consequences to CapRock noteholders who exchange their CapRock notes
for McLeodUSA notes will depend in part upon whether their CapRock notes and the
McLeodUSA notes constitute "securities." The term "security" is not defined in
the Code or applicable regulations and has not been clearly defined by court
decisions. Although there are a number of factors that may affect the
determination of whether a debt instrument is a "security," one of the most
important factors is the original term of the instrument, or the length of time
between the issuance of the instrument and its maturity. In general, instruments
with an original term of more than ten years are likely to be treated as
"securities," and instruments with an original term of less than five years are
unlikely to be treated as "securities." Although it is not entirely free from
doubt, we believe that the CapRock notes and the McLeodUSA notes should be
treated as "securities" for federal income tax purposes.

    Assuming that (a) the CapRock notes and the McLeodUSA notes constitute
"securities" for federal income tax purposes, and (b) consistent with the tax
opinion discussed above, the merger qualifies as a "reorganization" under
Section 368(a) of the Code and each of McLeodUSA and CapRock will be parties to
the reorganization within the meaning of Section 368(b) of the Code, the
exchange of outstanding CapRock notes for McLeodUSA notes pursuant to the
exchange offer should qualify as an exchange of securities issued by parties to
a reorganization occurring pursuant to the merger agreement under Section 354 of
the Code. In such case, the exchanging noteholder will not recognize gain or
loss on the exchange because the principal amount of McLeodUSA notes received in
the exchange will equal the principal amount of the CapRock notes exchanged for
such McLeodUSA notes. A CapRock noteholder who participates in the exchange will
generally have a tax basis in the McLeodUSA notes received equal to the
noteholder's adjusted tax basis in the CapRock notes exchanged, and the
exchanging noteholder's holding period for the McLeodUSA notes will include the
holding period for the CapRock notes exchanged. Notwithstanding the foregoing,
an exchanging noteholder will recognize ordinary income attributable to any
consideration received as payment for accrued interest on the CapRock notes that
was not previously included in the noteholder's income.

EXCHANGE AGENT

    We have appointed United States Trust Company of New York as exchange agent
for the exchange offer. Delivery of the Letters of Transmittal and any other
required documents, questions, requests for assistance, and requests for
additional copies of this prospectus or of the Letter of Transmittal should be
directed to the exchange agent as follows:

                                       35
<PAGE>
       BY REGISTERED OR CERTIFIED MAIL
       United States Trust Company of New York
       P.O. Box 112
       Bowling Green Station
       New York, New York 10274-0112

       BY HAND DELIVERY TO 4:30 P.M.
       United States Trust Company of New York
       30 Broad Street, B-Level
       New York, New York 10004-2304

       BY OVERNIGHT COURIER AND BY HAND DELIVERY AFTER 4:30 P.M. ON EXPIRATION
       DATE
       United States Trust Company of New York
       30 Broad Street, 14th Floor
       New York, New York 10004-2304

       BY FACSIMILE
       (212) 422-0183 or (646) 458-8111
       Confirm by telephone: (800) 548-6565

    Delivery to other than the above addresses or facsimile number will not
constitute a valid delivery.

FEES AND EXPENSES

    We will bear the expenses of soliciting tenders. The principal solicitation
is being made by mail. Additional solicitation may be made personally or by
telephone or other means by our officers, directors or employees.

    D.F. King, Inc. has been retained to act as the information agent in
connection with the exchange offer. The information agent may contact holders of
CapRock notes by mail, telephone, telex, telegraph and personal interviews and
may request brokers, dealers and other nominee holders to forward the exchange
offer materials to beneficial owners of CapRock notes. The information agent has
been retained pursuant to customary terms and conditions.

    We have not retained any dealer-manager or similar agent in connection with
the exchange offer and will not make any payments to brokers, dealers or others
soliciting acceptances of the exchange offer (other than the information agent).
We have agreed to pay the exchange agent reasonable and customary fees for its
services and will reimburse it for its reasonable out-of-pocket expenses. We
will also pay brokerage houses and other custodians, nominees and fiduciaries
the reasonable out-of-pocket expenses incurred by them in forwarding copies of
this prospectus and related documents to the beneficial owners of CapRock notes,
and in handling or tendering for their customers.

    Holders who tender their CapRock notes for exchange will not be obligated to
pay any transfer taxes in connection with the tender, except that if McLeodUSA
notes are to be delivered to, or are to be issued in the name of, any person
other than the registered holder of the CapRock notes tendered, or if a transfer
tax is imposed for any reason other than the exchange of CapRock notes in
connection with the exchange offer, then the amount of any such transfer tax,
whether imposed on the registered holder or any other persons, will be payable
by the tendering holder. If satisfactory evidence of payment of such transfer
tax or exemption therefrom is not submitted with the Letter of Transmittal, the
amount of such transfer tax will be billed directly to such tendering holder.

                                       36
<PAGE>
                                USE OF PROCEEDS

    The exchange offer is intended to satisfy our obligations under the merger
agreement. We will not receive any cash proceeds from the issuance of the
McLeodUSA notes offered by this prospectus. In consideration for issuing the
McLeodUSA notes as contemplated in this prospectus, we will receive, in
exchange, an equal number of CapRock notes in like principal amount. The CapRock
notes surrendered in exchange for McLeodUSA notes will be retired and canceled
by us and cannot be reissued.

                                       37
<PAGE>
                          INFORMATION ABOUT MCLEODUSA

GENERAL

    We provide selected telecommunications services to customers nationwide. We
provide integrated communications services, including local services, in many
Midwest and Rocky Mountain states and long distance and advanced data services
in all 50 states. We are a facilities-based telecommunications provider with 361
ATM switches, 37 voice switches, nearly 824,000 local lines and more than 9,000
employees. We expanded our marketplace for advanced data and Internet services
to all 50 states through our March 30, 2000 acquisition of Splitrock Services.
The network acquired in the Splitrock transaction is capable of transmitting
integrated next-generation data, video and voice services, reaching 800 cities
and 90% of the U.S. population. In the next 12 months, we plan to distribute 30
million telephone directories in 26 states, serving a population of 51 million.
We are a Nasdaq-100 company traded under the symbol "MCLD."

    We offer local, long distance, Internet access, data, voice mail and paging
services from a single company on a single bill. We believe we are the first
company in many of our markets to offer one-stop shopping for communications
services tailored to customers' specific needs.

    Our core business is providing communications services in competition with
existing local telephone companies, including:

    - local and long distance services

    - dial and dedicated Internet access

    - higher bandwidth Internet access services, such as digital subscriber line
      (DSL) and cable modem

    - value-added services such as virtual private networks and web hosting

    - bandwidth leasing and colocation services

    - facilities and services dedicated for a particular customer's use

    - telephone and computer sales, leasing, networking, service and
      installation

    - other communications services, including video, cellular, operator,
      payphone, mobile radio, wireless communications and paging services

    We also derive revenue from the following services related to our core
business:

    - sale of advertising in print and electronic telephone directories

    - traditional local telephone company services in east central Illinois and
      southeast South Dakota

    - telemarketing services

    In most of our local service markets, we compete with the existing local
phone company by leasing its lines and switches. In certain limited local
service markets in Illinois, Iowa, Minnesota and South Dakota, we operate our
own lines and switches. We provide long distance services by using our own
communications network facilities and leasing capacity from long distance and
local communications providers.

    We have developed and continue to develop fiber optic communications
networks in many of our target local markets in the Midwest and Rocky Mountain
regions to carry additional communications traffic on our own network. We are
actively developing enhancements to our national network and associated
next-generation services.

                                       38
<PAGE>
    We own and operate a broadband access network that is marketed to various
businesses throughout the United States. As part of our ongoing efforts to
enhance our network and data services, we are acquiring indefeasible rights to
use dark fiber optic strands in a nationwide network that will cover more than
15,000 route miles. This national network allows us to transmit integrated next-
generation data, video and voice services on both a retail and wholesale basis,
provides increased control and service quality and establishes a base for
growth.

    We want to be the leading and most admired provider of integrated
communications services in our markets. To achieve this goal, we are:

    - aggressively capturing customer share and generating revenue using leased
      communications network capacity

    - concurrently building our own communications network

    - migrating customers to our own communications network to provide enhanced
      services and reduce operating costs

    The principal elements of our business strategy are to:

    PROVIDE INTEGRATED COMMUNICATIONS SERVICES.  We believe we can rapidly
penetrate our target markets and build customer loyalty by providing an
integrated product offering to business and residential customers.

    BUILD CUSTOMER SHARE THROUGH BRANDING.  We believe we can create and
strengthen brand awareness in our target markets by branding our communications
services with the trade name McLeodUSA in combination with the distinctive
black-and-yellow motif of our telephone directories.

    PROVIDE OUTSTANDING CUSTOMER SERVICE.  Our customer service representatives
are available 24 hours a day, seven days a week, to answer customer calls. Our
customer-focused software and systems allow our representatives immediate access
to our customer and network data, enabling a rapid and effective response to
customer requests.

    EMPHASIZE SMALL AND MEDIUM SIZED BUSINESSES.  We primarily target small and
medium sized businesses because we believe we can rapidly capture customer share
by providing face-to-face business sales and strong service support to these
customers.

    EXPAND OUR FIBER OPTIC COMMUNICATIONS NETWORK.  We are building a
state-of-the-art fiber optic communications network to deliver multiple services
and reduce operating costs.

    EXPAND OUR INTRA-CITY FIBER OPTIC COMMUNICATIONS NETWORK.  Within selected
cities, we plan to extend our network directly to our customers' locations. This
will allow us to provide expanded services and reduce the expense of leasing
communications facilities from the local exchange carrier.

    EXPLORE ACQUISITIONS AND STRATEGIC ALLIANCES.  We plan to pursue
acquisitions, joint ventures and strategic alliances to expand or complement our
business.

    LEVERAGE PROVEN MANAGEMENT TEAM.  Our executive management team consists of
veteran telecommunications managers who successfully implemented similar
customer-focused telecommunications strategies in the past.

    As of June 30, 2000, we estimated, based on the combined McLeodUSA and
CapRock business plans, capital requirements and growth projections as of that
date, that we would require approximately $1.7 billion through 2002 to fund our
planned capital expenditures and operating expenses. We expect to meet these
funding needs through the existing cash balances of McLeodUSA and CapRock, our
existing lines of credit and income from future operations. Our estimated
aggregate capital requirements include the projected cost of:

                                       39
<PAGE>
    - expanding our fiber optic communications network, including national and
      intra-city fiber optic communications networks

    - adding voice and ATM switches

    - expanding operations in existing and new markets

    - developing wireless services in limited markets

    - funding general corporate purposes

    - completing recent acquisitions, including the merger

    - constructing, acquiring, developing or improving telecommunications assets

    Our projected funding plan assumes that (a) the indentures governing the
CapRock notes and the CapRock 11 1/2% senior notes due 2009 are amended to
provide that the acquisition of CapRock does not constitute a change of control
and (b) such notes will either remain outstanding as amended to remove various
covenants or be exchanged for a like principal amount of our notes pursuant to
the terms of the exchange offers. We may meet any additional capital needs by
issuing additional debt or equity securities or borrowing funds from one or more
lenders.

    The actual amount and timing of our future capital requirements are subject
to risks and uncertainties and may differ materially from our estimates.
Accordingly, we may need additional capital to continue to expand our markets,
operations, facilities, network and services. See "Risk Factors--Failure to
Raise Necessary Capital Could Restrict Our Ability to Develop Our Network and
Services and Engage in Strategic Acquisitions."

    Our principal executive offices are located at McLeodUSA Technology Park,
6400 C Street SW, P.O. Box 3177, Cedar Rapids, Iowa 52406-3177, and our phone
number is (319) 790-7800.

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

ADDITIONAL INFORMATION

    A detailed description of our business, executive compensation, various
benefit plans, including stock option plans, voting securities and the principal
holders of these securities, relationships and transactions between us and our
directors, executive officers and principal stockholders, financial statements
and other matters related to us is incorporated by reference or set forth in our
Annual Report on Form 10-K for the year ended December 31, 1999 and our
Quarterly Reports on Form 10-Q for the quarters ended March 31, 2000 and
June 30, 2000, incorporated by reference into this prospectus. Holders of
CapRock notes desiring copies of these documents may contact us at our address
or telephone number indicated under "Where You Can Find More Information."

                                       40
<PAGE>
               SELECTED CONSOLIDATED FINANCIAL DATA OF MCLEODUSA

    The information in the following unaudited table is based on historical
financial information included in the prior SEC filings of McLeodUSA, including
the McLeodUSA Annual Report on Form 10-K for the fiscal year ended December 31,
1999 and the Quarterly Report on Form 10-Q for the quarter ended June 30, 2000.
The following summary financial information should be read in connection with
this historical financial information including the notes which accompany such
financial information. This historical financial information is considered a
part of this document. See "Where You Can Find More Information." The audited
historical financial statements of McLeodUSA as of December 31, 1999, 1998 and
1997, and for each of the three years in the period ended December 31, 1999 were
audited by Arthur Andersen LLP, independent public accountants.

    The information in the following table reflects financial information for
the following companies McLeodUSA has acquired:

<TABLE>
<CAPTION>
ACQUIRED COMPANY                                            DATE ACQUIRED
----------------                                            -------------
<S>                                                       <C>
MWR Telecom, Inc........................................    April 28, 1995
Ruffalo, Cody & Associates, Inc.........................    July 15, 1996
Telecom*USA Publishing Group, Inc.......................  September 20, 1996
Consolidated Communications, Inc........................  September 24, 1997
Ovation Communications, Inc.............................    March 31, 1999
Splitrock Services, Inc.................................    March 30, 2000
</TABLE>

    The operations statement data and other financial data in the table include
the operations of these companies beginning on the dates they were acquired. The
balance sheet data in the table include the financial position of these
companies at the end of the periods presented. These acquisitions affect the
comparability of the financial data for the periods presented.

    The pro forma information presented in the operations statement data and
other financial data in the table includes the operations of Ovation, Splitrock
and CapRock as if they had been acquired at the beginning of the periods
presented and the as adjusted information in the balance sheet data in the table
includes the Ovation, Splitrock and CapRock financial position as of the date
presented. The 1999 pro forma amounts include adjustments to the CapRock 1999
historical financial statements to give effect to the issuance by CapRock in May
1999 of $210 million of its 11 1/2% senior notes as if the note issuance had
occurred at the beginning of such period.

    The information in the table also reflects the following debt and equity
securities that McLeodUSA has outstanding:

<TABLE>
<CAPTION>
DESCRIPTION OF SECURITIES                                  PRINCIPAL AMOUNT      DATE ISSUED
-------------------------                                  ----------------      -----------
<S>                                                        <C>                <C>
10 1/2% senior discount notes due March 1, 2007..........    $500 million       March 4, 1997
9 1/4% senior notes due July 15, 2007....................    $225 million       July 21, 1997
8 3/8% senior notes due March 15, 2008...................    $300 million       March 10, 1998
9 1/2% senior notes due November 1, 2008.................    $300 million      October 30, 1998
8 1/8% senior notes due February 15, 2009................    $500 million     February 22, 1999
Series A preferred stock.................................    $287 million      August 23, 1999
Series B preferred stock.................................    $687 million     September 15, 1999
Series C preferred stock.................................    $313 million     September 15, 1999
Senior Secured Credit Facilities.........................    $575 million        May 30, 2000
</TABLE>

    The operations statement data and other financial data in the table include
the effects of the issuances beginning on the dates the securities were issued.
The balance sheet data in the table include the effects of these issuances at
the end of the periods presented. The pro forma information presented in the
operations statement data and other financial data in the table includes the
effects of the

                                       41
<PAGE>
issuance of the 8 1/8% senior notes, the Series A, B and C preferred stock and
the Senior Secured Credit Facilities as if they had occurred at the beginning of
1999.

    On June 30, 1999, McLeodUSA announced that its board of directors had
declared a two-for-one stock split to be effected in the form of a stock
dividend. The record date for the stock split was July 12, 1999. Stockholders
record at the market close on that date received one additional share of
McLeodUSA Class A common stock for each share held. Distribution of the
additional shares took place on July 26, 1999. On February 29, 2000, McLeodUSA
announced that its board of directors had declared a three-for-one stock split
to be effected in the form of a stock dividend. The record date for the stock
split was April 4, 2000. Stockholders of record at the market close on that date
received two additional shares of McLeodUSA Class A common stock for each share
held. Distribution of the additional shares took place on April 24, 2000. All
information in the selected consolidated financial data has been adjusted to
reflect the two-for-one stock split and the three-for-one stock split.

    The ratio of earnings to fixed charges is calculated as follows: earnings
consist of net loss before income taxes plus fixed charges (excluding
capitalized interest). Fixed charges consist of interest on all debt (including
capitalized interest), amortization of debt discount and deferred loan costs and
the portion of rental expense that is representative of the interest component
of rental expense (deemed to be one-third of rental expense which management
believes is a reasonable approximation of the interest component). For each of
the years ended December 31, 1995, 1996, 1997, 1998 and 1999, earnings were
insufficient to cover fixed charges by $11.4 million, $22.6 million, $84.4
million, $135.5 million and $243.3 million, respectively. For the six months
ended June 30, 1999 and 2000, earnings were insufficient to cover fixed charges
by $118.5 million and $207.7 million, respectively. On a pro forma basis,
earnings would not have been sufficient to cover fixed charges by $523.3 million
and $313.5 million for the year ended December 31, 1999 and the six months ended
June 30, 2000, respectively.

                                                 (TABLE BEGINS ON THE NEXT PAGE)

                                       42
<PAGE>
               SELECTED CONSOLIDATED FINANCIAL DATA OF MCLEODUSA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                       ---------------------------------------------------------------------
                                                                                                  PRO FORMA
                                         1995       1996       1997       1998         1999         1999
                                       --------   --------   --------   ---------   ----------   -----------
                                                                                                 (UNAUDITED)
<S>                                    <C>        <C>        <C>        <C>         <C>          <C>
OPERATIONS STATEMENT DATA:
  Revenue............................  $ 28,998   $ 81,323   $267,886   $ 604,146   $  908,792   $1,210,667
                                       --------   --------   --------   ---------   ----------   ----------
  Operating expenses:
    Cost of service..................    19,667     52,624    151,190     323,208      457,085      699,401
    Selling, general and
      administrative.................    18,054     46,044    148,158     260,931      392,687      481,488
    Depreciation and amortization....     1,835      8,485     33,275      89,107      190,695      346,131
    Other............................        --      2,380      4,632       5,575           --           --
                                       --------   --------   --------   ---------   ----------   ----------
    Total operating expenses.........    39,556    109,533    337,255     678,821    1,040,467    1,527,020
  Operating loss.....................   (10,558)   (28,210)   (69,369)    (74,675)    (131,675)    (316,353)
  Interest income (expense), net.....      (771)     5,369    (11,967)    (52,234)     (94,244)    (191,068)
  Other income.......................        --        495      1,426       1,997        5,637        7,163
  Income taxes.......................        --         --         --          --           --           --
                                       --------   --------   --------   ---------   ----------   ----------
  Net loss...........................   (11,329)   (22,346)   (79,910)   (124,912)    (220,282)    (500,528)
  Preferred stock dividends..........        --         --         --          --      (17,727)     (54,375)
                                       --------   --------   --------   ---------   ----------   ----------
  Loss applicable to common stock....  $(11,329)  $(22,346)  $(79,910)  $(124,912)  $ (238,009)  $ (554,633)
                                       ========   ========   ========   =========   ==========   ==========
  Loss per common share..............  $   (.07)  $   (.09)  $   (.24)  $    (.33)  $     (.54)  $     (.99)
                                       ========   ========   ========   =========   ==========   ==========
  Weighted average common shares
    outstanding......................   168,024    243,036    329,844     376,842      443,130      559,751
                                       ========   ========   ========   =========   ==========   ==========
  Ratio of earnings to fixed
    charges..........................        --         --         --          --           --           --
                                       ========   ========   ========   =========   ==========   ==========
</TABLE>

<TABLE>
<CAPTION>
                                                                     SIX MONTHS ENDED JUNE 30
                                                              ---------------------------------------
                                                                                           PRO FORMA
                                                                 1999          2000          2000
                                                              -----------   -----------   -----------
                                                              (UNAUDITED)   (UNAUDITED)   (UNAUDITED)
<S>                                                           <C>           <C>           <C>
OPERATIONS STATEMENT DATA:
  Revenue...................................................   $ 403,771     $ 620,082     $ 769,055
                                                               ---------     ---------     ---------
  Operating expenses:
    Cost of service.........................................     205,507       344,426       466,226
    Selling, general and administrative.....................     178,339       256,563       309,973
    Depreciation and amortization...........................      78,708       163,193       213,415
    Other...................................................          --            --           872
                                                               ---------     ---------     ---------
    Total operating expenses................................     462,554       764,182       990,486
  Operating loss............................................     (58,783)     (144,100)     (221,431)
  Interest income (expense), net............................     (50,666)      (42,077)      (70,486)
  Other income..............................................         562         1,971         1,996
  Income taxes..............................................          --            --            --
                                                               ---------     ---------     ---------
  Net loss..................................................    (108,887)     (184,206)     (289,921)
  Preferred stock dividends.................................          --       (27,204)      (27,204)
                                                               ---------     ---------     ---------
  Loss applicable to common stock...........................   $(108,887)    $(211,410)    $(317,125)
                                                               =========     =========     =========
  Loss per common share.....................................   $    (.26)    $    (.40)    $    (.54)
                                                               =========     =========     =========
  Weighted average common shares outstanding................     423,210       529,109       590,221
                                                               =========     =========     =========
  Ratio of earnings to fixed charges........................          --            --            --
                                                               =========     =========     =========
</TABLE>

                                       43
<PAGE>
               SELECTED CONSOLIDATED FINANCIAL DATA OF MCLEODUSA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                  DECEMBER 31,                                JUNE 30, 2000
                           ----------------------------------------------------------   -------------------------
                             1995       1996        1997         1998         1999        ACTUAL       PRO FORMA
                           --------   --------   ----------   ----------   ----------   -----------   -----------
                                                                                        (UNAUDITED)   (UNAUDITED)
<S>                        <C>        <C>        <C>          <C>          <C>          <C>           <C>
BALANCE SHEET DATA:
  Current assets.........  $ 8,507    $224,401   $  517,869   $  793,192   $1,569,473   $1,647,070    $1,879,002
  Working capital
    (deficit)............  $(1,208)   $185,968   $  378,617   $  613,236   $1,272,794   $  859,997    $  913,955
  Property and equipment,
    net..................  $16,119    $ 92,123   $  373,804   $  629,746   $1,270,032   $1,897,962    $2,321,001
  Total assets...........  $28,986    $452,994   $1,345,652   $1,925,197   $4,203,147   $7,069,543    $7,791,496
  Long-term debt.........  $ 3,600    $  2,573   $  613,384   $1,245,170   $1,763,725   $2,370,370    $2,718,588
  Redeemable convertible
    preferred stock......  $    --    $     --   $       --   $       --   $1,000,000   $1,000,000    $1,000,000
  Stockholders' equity...  $14,958    $403,429   $  559,379   $  462,806   $1,108,542   $2,878,436    $3,074,207
</TABLE>

<TABLE>
<CAPTION>
                                                      YEAR ENDED DECEMBER 31,
                                --------------------------------------------------------------------
                                                                                          PRO FORMA
                                  1995       1996        1997        1998       1999        1999
                                --------   ---------   ---------   --------   --------   -----------
                                                                                         (UNAUDITED)
<S>                             <C>        <C>         <C>         <C>        <C>        <C>
OTHER FINANCIAL DATA:
  Capital expenditures
    Property, plant and
      equipment...............  $  6,364   $  79,845   $ 179,255   $289,923   $580,003   $  820,756
    Business acquisitions.....  $  8,333   $  93,937   $ 421,882   $ 49,737   $736,626   $3,376,180
  EBITDA(1) ..................  $ (8,723)  $ (17,345)  $ (31,462)  $ 20,007   $ 59,020   $   29,778
</TABLE>

<TABLE>
<CAPTION>
                                                                   SIX MONTHS ENDED JUNE 30,
                                                            ---------------------------------------
                                                                                         PRO FORMA
                                                               1999          2000          2000
                                                            -----------   -----------   -----------
                                                            (UNAUDITED)   (UNAUDITED)   (UNAUDITED)
<S>                                                         <C>           <C>           <C>
OTHER FINANCIAL DATA:
  Capital expenditures
    Property, plant and equipment.........................    $220,390    $  559,834    $  804,163
    Business acquisitions.................................    $525,161    $2,052,925    $2,415,523
  EBITDA(1) ..............................................    $ 19,925    $   19,093    $   (7,144)
</TABLE>

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

(1) EBITDA consists of operating loss before depreciation, amortization and
    other nonrecurring operating expenses. McLeodUSA has included EBITDA data
    because it is a measure commonly used in the industry. EBITDA is not a
    measure of financial performance under generally accepted accounting
    principles and should not be considered an alternative to net income as a
    measure of performance or to cash flows as a measure of liquidity.

                                       44
<PAGE>
                            PRO FORMA FINANCIAL DATA

    The following unaudited pro forma financial information has been prepared to
give effect to:

    - the issuance of the 8 1/8% senior notes in February 1999

    - the acquisition of Ovation Communications, Inc. in March 1999

    - the issuance of the 6.75% Series A preferred stock in August 1999

    - the issuance of the Series B preferred stock and Series C preferred stock
      in September 1999

    - the acquisition of Splitrock Services, Inc. in March 2000

    - the completion of the Senior Secured Credit Facilities in May 2000

    - the merger

    For purposes of this pro forma presentation, the issuance of the 8 1/8%
senior notes is referred to as the "Notes Offering" and the issuance of the
Series A, Series B and Series C preferred stock are collectively referred to as
the "Preferred Stock Issuances." The Unaudited Pro Forma Condensed Consolidated
Balance Sheet assumes that the merger was consummated on June 30, 2000.

    The Unaudited Pro Forma Condensed Consolidated Statements of Operations
include the operations of Ovation Communications, Inc., the operations of
Splitrock Services, Inc., and the operations of CapRock as if the acquisition of
Ovation and Splitrock and the merger with CapRock were consummated on January 1,
1999 and the related weighted average share amounts have been adjusted to give
effect to the shares issued in the transactions as if they had been issued on
January 1, 1999. The CapRock results have been adjusted to give effect to the
issuance in May 1999 by CapRock of $210 million of its 11 1/2% senior notes due
2009 as if the issuance was consummated on January 1, 1999. It also assumes that
interest related to the Notes Offering and the Senior Secured Credit Facilities,
dividends related to the Preferred Stock Issuances and the additional
depreciation and amortization due to the increased value of tangible and
intangible assets acquired through the acquisition of Ovation, Splitrock and the
merger with CapRock, using the purchase method of accounting, began January 1,
1999. The unaudited pro forma financial information is derived from and should
be read in conjunction with the Consolidated Financial Statements of McLeodUSA
and the related notes thereto included in the McLeodUSA Annual Report on Form
10-K for the fiscal year ended December 31, 1999. The pro forma adjustments for
the acquisitions of Ovation and Splitrock, the Notes Offering and the Preferred
Stock Issuances are incorporated by reference from a Current Report on Form
8-K/A filed with the SEC on June 13, 2000.

    For purposes of allocating the net purchase price among the various assets
to be acquired, McLeodUSA has preliminarily considered the carrying value of the
acquired assets to approximate their fair value, with all of the excess of the
net purchase price being attributed to intangible assets, primarily goodwill.
McLeodUSA intends to more fully evaluate the acquired assets following
consummation of the merger and, as a result, the allocation of the net purchase
price among the acquired tangible and intangible assets may change.

    The unaudited pro forma financial information is provided for informational
purposes only and is not necessarily indicative of the operating results that
would have occurred had the merger been consummated at the beginning of 1999,
nor is it necessarily indicative of future operating results or financial
position.

                                                 (TABLE BEGINS ON THE NEXT PAGE)

                                       45
<PAGE>
                    MCLEODUSA INCORPORATED AND SUBSIDIARIES
           UNAUDITED PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEETS
             (IN THOUSANDS, EXCEPT SHARE AND PER SHARE INFORMATION)
                              AS OF JUNE 30, 2000

<TABLE>
<CAPTION>
                                                                                   ADJUSTMENTS            PRO FORMA
                                                                                   FOR CAPROCK           FOR CAPROCK
                                                         MCLEODUSA    CAPROCK      TRANSACTION           TRANSACTION
                                                        -----------   --------   ---------------        -------------
<S>                                                     <C>           <C>        <C>                    <C>
ASSETS
CURRENT ASSETS:
  Cash and cash equivalents...........................  $  931,318    $ 3,680       $     --             $  934,998
  Other current assets................................     715,752    245,596        (17,344)(2)            944,004
                                                        ----------    --------      --------             ----------
    TOTAL CURRENT ASSETS..............................   1,647,070    249,276        (17,344)             1,879,002
Property and Equipment, net...........................   1,897,962    423,039             --              2,321,001
Intangible assets.....................................   3,373,029         --         63,123(1)           3,436,152
Other assets..........................................     151,482      3,859             --                155,341
                                                        ----------    --------      --------             ----------
    TOTAL ASSETS......................................  $7,069,543    $676,174      $ 45,779             $7,791,496
                                                        ==========    ========      ========             ==========

LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities...................................  $  787,083    $144,964      $ 33,000(3)          $  965,047
Long-term debt, less current maturities...............   2,370,370    348,218             --              2,718,588
Other long-term liabilities...........................      33,654      5,254         (5,254)(2)             33,654
                                                        ----------    --------      --------             ----------
    TOTAL LIABILITIES.................................   3,191,107    498,436         27,746              3,717,289
                                                        ----------    --------      --------             ----------
Redeemable convertible preferred stock................   1,000,000         --             --              1,000,000
                                                        ----------    --------      --------             ----------

STOCKHOLDERS' EQUITY:
  Preferred stock.....................................          12         --             --                     12
  Common stock........................................       5,817        387           (237)                 5,967
  Additional paid-in capital..........................   3,497,346    191,808          3,813              3,692,967
  Treasury Stock, at cost.............................          --       (678)           678                     --
  Retained earnings (deficit).........................    (706,669)   (13,570)        13,570               (706,669)
  Accumulated other comprehensive income..............      81,930       (209)           209                 81,930
                                                        ----------    --------      --------             ----------
    TOTAL STOCKHOLDERS' EQUITY........................   2,878,436    177,738         18,033              3,074,207
                                                        ----------    --------      --------             ----------
    TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY........  $7,069,543    $676,174      $ 45,779             $7,791,496
                                                        ==========    ========      ========             ==========
</TABLE>

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

(1) The adjustment for the merger reflects the preliminary allocation of the net
    purchase price of CapRock to the net assets of CapRock that are to be
    acquired, including intangible assets, and records the issuance of
    15,023,318 shares of McLeodUSA Class A common stock valued at $13.77 per
    share. The value of $13.77 per share represents the average closing price of
    McLeodUSA Class A common stock on The Nasdaq Stock Market for the 10 trading
    days beginning five days prior to the date the merger agreement was
    announced, October 2, 2000, and ending four days after such announcement.
    The net purchase price of approximately $579 million is equal to (1) the
    product of (A) the total number of shares of CapRock common stock
    attributable to outstanding CapRock common stock and options with exercise
    prices below the closing price of $5.063 (totaling 39,001,954) as of October
    2, 2000, MULTIPLIED BY (B) the conversion ratio of 0.3876, MULTIPLIED BY
    (C) $13.77, the value of a share of McLeodUSA Class A common stock
    (calculated as described above), MINUS (2) the aggregate option proceeds to
    be received (approximately $0.3 million) PLUS (3) the principal amount of
    outstanding CapRock senior notes ($360 million) and the cost directly
    attributable to the merger ($11 million). The allocation of the net purchase
    price to the net assets, excluding debt, (approximately $516 million) and
    debt ($360 million) of CapRock as of June 30, 2000, results in goodwill of
    approximately $63 million.

(2) To eliminate CapRock's deferred tax assets and deferred tax liabilities.
    McLeodUSA expects to continue to be in a net deferred tax asset position
    after the merger and will continue to provide a valuation allowance on the
    net deferred tax assets.

(3) Reflects an increase in current liabilities related to banking, legal and
    accounting fees, write-off of debt issuance costs and unaccreted discount on
    CapRock's senior notes and other matters directly attributable to the merger
    under EITF 95-3.

                                       46
<PAGE>
                    MCLEODUSA INCORPORATED AND SUBSIDIARIES
      UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                  (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)
                     TWELVE MONTHS ENDED DECEMBER 31, 1999

<TABLE>
<CAPTION>
                                  PRO FORMA                             PRO FORMA                  ADJUSTMENTS        PRO FORMA
                                FOR SPLITROCK     ADJUSTMENT FOR        FOR CREDIT   CAPROCK AS    FOR CAPROCK       FOR CAPROCK
                                ACQUISITION(2)   CREDIT FACILITIES      FACILITIES   ADJUSTED(4)   ACQUISITION       ACQUISITION
                                --------------   -----------------      ----------   -----------   ------------      ------------
<S>                             <C>              <C>                    <C>          <C>           <C>               <C>
OPERATIONS STATEMENT DATA:
  Revenue.....................    $1,018,044         $     --           $1,018,044    $192,623       $    --          $1,210,667
                                  ----------         --------           ----------    --------       -------          ----------
  Operating expenses:
    Cost of service...........       583,725               --             583,725      115,676            --             699,401
    Selling, general and
      administrative..........       424,953               --             424,953       56,535            --             481,488
    Depreciation and
      amortization............       333,277               --             333,277        9,698         3,156(5)          346,131
    Other.....................            --               --                  --           --            --                  --
                                  ----------         --------           ----------    --------       -------          ----------
      Total operating
        expenses..............     1,341,955               --           1,341,955      181,909         3,156           1,527,020
                                  ----------         --------           ----------    --------       -------          ----------
    Operating income (loss)...      (323,911)              --            (323,911)      10,714        (3,156)           (316,353)
    Interest income (expense),
      net.....................      (127,456)         (36,493)(3)        (163,949)     (27,119)           --            (191,068)
    Other nonoperating income
      (expense)...............         5,637               --               5,637        1,526            --               7,163
    Income taxes..............            --               --                  --        5,505        (5,505)(6)              --
                                  ----------         --------           ----------    --------       -------          ----------
    Net income (loss).........      (445,730)         (36,493)           (482,223)      (9,374)       (8,661)           (500,258)
    Preferred stock
      dividends...............       (54,375)              --             (54,375)          --            --             (54,375)
                                  ----------         --------           ----------    --------       -------          ----------
    Earnings applicable to
      common stock............    $ (500,105)        $(36,493)          $(536,598)    $ (9,374)      $(8,661)         $ (554,633)
                                  ==========         ========           ==========    ========       =======          ==========
    Loss per common and common
      equivalent share........    $    (0.92)                           $   (0.99)                                    $    (0.99)
                                  ==========                            ==========                                    ==========
    Weighted average common
      and common equivalent
      shares outstanding......       544,728                              544,728                     15,023             559,751
                                  ==========                            ==========                   =======          ==========
OTHER FINANCIAL DATA:
  EBITDA(1)...................    $    9,366         $     --           $   9,366     $ 20,412       $    --          $   29,778
</TABLE>

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

(1) EBITDA consists of operating loss before depreciation, amortization and
    other nonrecurring operating expenses. McLeodUSA has included EBITDA data
    because it is a measure commonly used in the industry. EBITDA is not a
    measure of financial performance under generally accepted accounting
    principles and should not be considered an alternative to net income as a
    measure of performance or to cash flows as a measure of liquidity.

(2) The "Pro Forma for Splitrock Acquisition" information is derived from the
    Pro Forma Financial Statements that were filed by McLeodUSA with the SEC on
    a Current Report on Form 8-K/A on June 13, 2000.

(3) McLeodUSA used cash on hand and funds drawn from its Senior Secured Credit
    Facilities to retire the outstanding Splitrock 11 3/4% senior notes in July
    2000. This adjustment records the pro forma annual interest expense of
    approximately $66 million on the Senior Secured Credit Facilities, reduced
    by the interest expense on the Splitrock 11 3/4% senior notes as previously
    reported in the "Pro Forma for Splitrock Acquisition."

(4) As adjusted financial information gives effect to the issuance by CapRock of
    $210 million of its 11 1/2% senior notes due 2009 in May 1999 as if such
    issuance had occurred on January 1, 1999. See "CapRock Communications
    Corp.--Unaudited Pro Forma Condensed Statements of Operations."

(5) To amortize intangibles acquired in the merger over 20 years.

(6) To eliminate CapRock's income tax benefit.

                                       47
<PAGE>
                    MCLEODUSA INCORPORATED AND SUBSIDIARIES
      UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                  (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)
<TABLE>
<CAPTION>
                                                                  SIX MONTHS ENDED JUNE 30, 2000
                                    ------------------------------------------------------------------------------------------
                                                                 ADJUSTMENTS     PRO FORMA FOR    ADJUSTMENTS      PRO FORMA
                                                                FOR SPLITROCK      SPLITROCK      FOR CREDIT      FOR CREDIT
                                    MCLEODUSA    SPLITROCK(2)   ACQUISITION(2)    ACQUISITION     FACILITIES      FACILITIES
                                    ----------   ------------   --------------   -------------   -------------   -------------
<S>                                 <C>          <C>            <C>              <C>             <C>             <C>
OPERATIONS STATEMENT DATA:
  Revenue.........................  $ 620,082      $ 35,037         $     --       $ 655,119       $     --        $ 655,119
                                    ---------      --------         --------       ---------       --------        ---------

  Operating expenses:
    Cost of service...............    344,426        42,580               --         387,006             --          387,006
    Selling, general and
      administrative..............    256,563        10,012               --         266,575             --          266,575
    Depreciation and
      amortization................    163,193        12,470           27,097         202,760             --          202,760
    Other.........................         --           872               --             872             --              872
                                    ---------      --------         --------       ---------       --------        ---------
      Total operating expenses....    764,182        65,934           27,097         857,213             --          857,213
                                    ---------      --------         --------       ---------       --------        ---------
    Operating income (loss).......   (144,100)      (30,897)         (27,097)       (202,094)            --         (202,094)
    Interest income (expense),
      net.........................    (42,077)       (6,302)              --         (48,379)       (15,086)(3)      (63,465)
    Other nonoperating income
      (expense)...................      1,971            --               --           1,971             --            1,971
    Income taxes..................         --            --               --              --             --               --
                                    ---------      --------         --------       ---------       --------        ---------
    Net income (loss).............   (184,206)      (37,199)         (27,097)       (248,502)       (15,086)        (263,588)
    Preferred stock dividends.....    (27,204)           --               --         (27,204)            --          (27,204)
                                    ---------      --------         --------       ---------       --------        ---------
    Earnings applicable to common
      stock.......................  $(211,410)     $(37,199)        $(27,097)      $(275,706)      $(15,086)       $(290,792)
                                    =========      ========         ========       =========       ========        =========
    Loss per common and common
      equivalent share............  $   (0.40)                                         (0.48)                      $   (0.51)
                                    =========                                      =========                       =========
    Weighted average common and
      common equivalent shares
      outstanding.................    529,109                         46,089         575,198                         575,198
                                    =========                       ========       =========                       =========

OTHER FINANCIAL DATA:
    EBITDA(1).....................  $  19,093      $(17,555)        $     --       $   1,538       $     --        $   1,538

<CAPTION>
                                        SIX MONTHS ENDED JUNE 30, 2000
                                    --------------------------------------
                                                ADJUSTMENTS     PRO FORMA
                                                FOR CAPROCK    FOR CAPROCK
                                    CAPROCK     ACQUISITION    ACQUISITION
                                    --------   -------------   -----------
<S>                                 <C>        <C>             <C>
OPERATIONS STATEMENT DATA:
  Revenue.........................  $113,936     $     --       $ 769,055
                                    --------     --------       ---------
  Operating expenses:
    Cost of service...............    79,220           --         466,226
    Selling, general and
      administrative..............    43,398           --         309,973
    Depreciation and
      amortization................     9,077        1,578(4)      213,415
    Other.........................        --           --             872
                                    --------     --------       ---------
      Total operating expenses....   131,695        1,578         990,486
                                    --------     --------       ---------
    Operating income (loss).......   (17,759)      (1,578)       (221,431)
    Interest income (expense),
      net.........................    (7,021)          --         (70,486)
    Other nonoperating income
      (expense)...................        25           --           1,996
    Income taxes..................     9,118       (9,118)(5)          --
                                    --------     --------       ---------
    Net income (loss).............   (15,637)     (10,696)       (289,921)
    Preferred stock dividends.....        --           --         (27,204)
                                    --------     --------       ---------
    Earnings applicable to common
      stock.......................  $(15,637)    $(10,696)      $(317,125)
                                    ========     ========       =========
    Loss per common and common
      equivalent share............                              $   (0.54)
                                                                =========
    Weighted average common and
      common equivalent shares
      outstanding.................                 15,023         590,221
                                                 ========       =========
OTHER FINANCIAL DATA:
    EBITDA(1).....................  $ (8,682)    $     --       $  (7,144)
</TABLE>

------------------------------
(1) EBITDA consists of operating loss before depreciation, amortization and
    other nonrecurring operating expenses. McLeodUSA has included EBITDA data
    because it is a measure commonly used in the industry. EBITDA is not a
    measure of financial performance under generally accepted accounting
    principles and should not be considered an alternative to net income as a
    measure of performance or to cash flows as a measure of liquidity.

(2) The "Splitrock" column represents Splitrock's Statement of Operations for
    the period of January 1, 2000 through March 30, 2000, the date of the
    acquisition of SplitRock by McLeodUSA. The Splitrock financial statements
    and the information in the "Adjustments for Splitrock Acquisition" column
    are derived from the Pro Forma Financial Statements that were filed by
    McLeodUSA with the SEC on a Current Report on Form 8-K/A on June 13, 2000.

(3) McLeodUSA used cash on hand and funds drawn from its Senior Secured Credit
    Facilities to retire the outstanding Splitrock 11 3/4% senior notes in July
    2000. This adjustment records the pro forma interest expense on the Senior
    Secured Credit Facilities reduced by the interest expense on the Splitrock
    11 3/4% senior notes as previously reported in the "Pro Forma for Splitrock
    Acquisition" column.

(4) To amortize intangibles acquired in the merger over 20 years.

(5) To eliminate CapRock's income tax benefit.

                                       48
<PAGE>
                          CAPROCK COMMUNICATIONS CORP.
             UNAUDITED PRO FORMA CONDENSED STATEMENTS OF OPERATIONS
                  (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)

    The following unaudited pro forma financial information has been prepared to
give effect to the issuance by CapRock of $210 million of its 11 1/2% senior
notes due 2009 in May 1999 as if such issuance had occurred on January 1, 1999.
The unaudited pro forma financial information is derived from and should be read
in conjunction with the financial statements of CapRock and the related notes
thereto included in the CapRock Annual Report on Form 10-K for the fiscal year
ended December 31, 1999, which is incorporated by reference into this
prospectus. The pro forma adjustments are based upon available information and
assumptions that management believes to be reasonable.

<TABLE>
<CAPTION>
                                                                    TWELVE MONTHS ENDED DECEMBER 31, 1999
                                                              --------------------------------------------------
                                                                            ADJUSTMENTS           PRO FORMA
                                                              CAPROCK    FOR MAY 1999 NOTES   FOR MAY 1999 NOTES
                                                              --------   ------------------   ------------------
<S>                                                           <C>        <C>                  <C>
OPERATIONS STATEMENT DATA:
  Revenue...................................................  $192,623        $     --             $192,623
                                                              --------        --------             --------
  Operating expenses:
    Cost of service.........................................   115,676              --              115,676
    Selling, general and administrative.....................    56,535              --               56,535
    Depreciation and amortization...........................     9,698              --                9,698
    Other...................................................        --              --                   --
                                                              --------        --------             --------
        Total operating expenses............................   181,909              --              181,909
  Operating income (loss)...................................    10,714              --               10,714
  Interest income (expense), net............................   (17,861)         (9,258)             (27,119)
  Other nonoperating income (expense).......................     1,526              --                1,526
  Income tax benefit (expense)..............................     2,080           3,425                5,505
                                                              --------        --------             --------
  Net income (loss).........................................    (3,541)         (5,833)              (9,374)
  Preferred stock dividends.................................        --              --                   --
                                                              --------        --------             --------
  Earnings applicable to common stock.......................  $ (3,541)       $ (5,833)            $ (9,374)
                                                              ========        ========             ========
  Loss per common and common equivalent share...............  $  (0.11)                            $  (0.30)
                                                              ========                             ========
  Weighted average common and common equivalent shares
    outstanding.............................................    31,727                               31,727
                                                              ========                             ========
</TABLE>

                                       49
<PAGE>
                       DESCRIPTION OF THE MCLEODUSA NOTES

GENERAL

    The McLeodUSA notes will be issued under an indenture between McLeodUSA and
United States Trust Company of New York, as trustee, which we refer to as the
McLeodUSA indenture. For purposes of this description of the McLeodUSA notes,
references to "McLeodUSA," "we," "our" or "us" refers to McLeodUSA Incorporated
and does not include its subsidiaries except for purposes of financial data
determined on a consolidated basis.

    The terms of the McLeodUSA notes include those stated in the McLeodUSA
indenture and those made a part of the McLeodUSA indenture by reference to the
Trust Indenture Act of 1939 as in effect on the date of the McLeodUSA indenture.
The McLeodUSA notes are subject to all of those terms, and holders of the
McLeodUSA notes should refer to the McLeodUSA indenture and the Trust Indenture
Act for a complete statement of the applicable terms. A copy of the McLeodUSA
indenture is available from McLeodUSA on request. The statements and definitions
of terms under this caption relating to the McLeodUSA notes and the McLeodUSA
indenture are summaries and do not purport to be complete. These summaries make
use of terms defined in the McLeodUSA indenture and are qualified in their
entirety by express reference to the McLeodUSA indenture. Some of the terms used
in this description are defined below under "--Definitions."

    The McLeodUSA notes will rank equal in right of payment with our 10 1/2%
senior discount notes, 9 1/4% senior notes, 8 3/8% senior notes, 9 1/2% senior
notes, 8 1/8% senior notes, any of our notes to be issued pursuant to the
Concurrent Exchange Offer and all other existing and future senior unsecured
indebtedness of McLeodUSA and will rank senior in right of payment to all
existing and future subordinated indebtedness of McLeodUSA. As of June 30, 2000,
McLeodUSA had no outstanding subordinated indebtedness and, other than our
10 1/2% senior discount notes, 9 1/4% senior notes, 8 3/8% senior notes, 9 1/2%
senior notes and 8 1/8% senior notes, had no outstanding indebtedness that would
rank equal with the McLeodUSA notes. The McLeodUSA notes will not be secured by
any assets and will be effectively subordinated to any existing and future
secured indebtedness of McLeodUSA and its subsidiaries, including the Senior
Secured Credit Facilities (as defined in "Other McLeodUSA Indebtedness"), and
any other Senior Credit Facility or Qualified Receivable Facility we enter into,
to the extent of the value of the assets securing such indebtedness. As of
June 30, 2000, the total secured indebtedness of McLeodUSA and its subsidiaries
was approximately $631.7 million. For a description of these notes and other
outstanding indebtedness of McLeodUSA, see "Other McLeodUSA Indebtedness."

    The operations of McLeodUSA are conducted through its subsidiaries and,
therefore, McLeodUSA depends upon cash flow from those entities to meet its
obligations. McLeodUSA's subsidiaries will have no direct obligation to pay
amounts due on the McLeodUSA notes and will not guarantee the McLeodUSA notes.
As a result, the McLeodUSA notes will be effectively subordinated to all
existing and future third-party indebtedness, including the Senior Secured
Credit Facilities, any other Senior Credit Facility or any applicable Qualified
Receivable Facility we enter into, and other liabilities of McLeodUSA's
subsidiaries, including trade payables. As of June 30, 2000, the total
liabilities of McLeodUSA's subsidiaries, after the elimination of loans and
advances by McLeodUSA to its subsidiaries, were approximately $700.9 million. In
addition, the McLeodUSA notes will be effectively subordinated in certain
respects to any CapRock notes and any CapRock 11 1/2% senior notes due 2009 that
remain outstanding after this exchange offer and the Concurrent Exchange Offer,
for which CapRock will remain the obligor. Any rights of McLeodUSA and its
creditors, including the holders of McLeodUSA notes, to participate in the
assets of any of McLeodUSA's subsidiaries upon any liquidation or reorganization
of any such subsidiary will be subject to the prior claims of that subsidiary's
creditors, including trade creditors.

                                       50
<PAGE>
PRINCIPAL, MATURITY AND INTEREST

    The McLeodUSA notes will be limited in principal amount to $150 million and
will mature on July 15, 2008. Interest on the McLeodUSA notes will accrue at the
rate of 12% per annum and will be payable in cash semi-annually in arrears on
January 15 and July 15 of each year, commencing January 15, 2001. Interest will
be computed on the basis of a 360-day year comprised of twelve 30-day months.
Interest on the McLeodUSA notes will be deemed to accrue from July 15, 2000.

    Principal and interest will be payable at the office of the Paying Agent
but, at the option of McLeodUSA, interest may be paid by check mailed to the
registered holders at their registered addresses. The McLeodUSA notes will be
issued without coupons and in fully registered form only, in minimum
denominations of $1,000 and any integral multiples of $1,000 in excess thereof.
Unless otherwise designated by McLeodUSA, McLeodUSA's office or agency in New
York will be the office of the trustee maintained for such purpose.

BOOK-ENTRY SYSTEM

    The McLeodUSA notes will initially be issued in the form of one or more
Global Securities, as defined in the McLeodUSA indenture, held in book-entry
form. The McLeodUSA notes will be deposited with the trustee as custodian for
the Depository, and the Depository or its nominee will initially be the sole
registered holder of the McLeodUSA notes for all purposes under the McLeodUSA
indenture. Except as set forth below, a Global Security may not be transferred
except as a whole by the Depository to a nominee of the Depository or by a
nominee of the Depository to the Depository.

    The McLeodUSA notes that are issued as described below under "--Certificated
Notes" will be issued in definitive form.

    Upon the transfer of a McLeodUSA note in definitive form, such McLeodUSA
note will, unless the Global Security has previously been exchanged for
McLeodUSA notes in definitive form, be exchanged for an interest in the Global
Security representing the principal amount McLeodUSA notes being transferred.

    Upon the issuance of a Global Security, the Depository or its nominee will
credit, on its internal system, the accounts of persons holding through it with
the individual beneficial interests in such Global Security representing the
respective principal amounts of the McLeodUSA notes held by such persons.
Ownership of beneficial interests in a Global Security will be limited to
persons that have accounts with the Depository ("participants") or persons that
may hold interests through participants. Ownership of beneficial interests by
participants in a Global Security will be shown on, and the transfer of that
ownership interest will be effected only through, records maintained by the
Depository or its nominee for such Global Security. Ownership of beneficial
interests in such Global Security by persons that hold through participants will
be shown on, and the transfer of that ownership interest within such participant
will be effected only through, records maintained by such participant. The laws
of some jurisdictions require that some purchasers of securities take physical
delivery of such securities in definitive form. Such limits and such laws may
impair the ability to transfer beneficial interests in a Global Security.

    Payment of principal of, premium, if any, on and interest on McLeodUSA notes
represented by any such Global Security will be made to the Depository or its
nominee, as the case may be, as the sole registered owner and the sole holder of
the McLeodUSA notes represented thereby for all purposes under the McLeodUSA
indenture. None of McLeodUSA, the trustee or any agent of McLeodUSA will have
any responsibility or liability for:

    1.  any aspect of the Depository's reports relating to or payments made on
       account of beneficial ownership interests in a Global Security
       representing any McLeodUSA notes or for maintaining, supervising or
       reviewing any of the Depository's records relating to such beneficial
       ownership interests or

                                       51
<PAGE>
    2.  any other matter relating to the actions and practices of the Depository
       or any of its participants.

    McLeodUSA has been advised by the Depository that upon receipt of any
payment of principal of, premium, if any, on or interest on any Global Security,
the Depository will immediately credit, on its book-entry registration and
transfer system, the accounts of participants with payments in amounts
proportionate to their respective beneficial interests in the principal or face
amount of such Global Security, as shown on the records of the Depository.
McLeodUSA expects that payments by participants to owners of beneficial
interests in a Global Security held through such participants will be governed
by standing instructions and customary practices as is now the case with
securities held for customer accounts registered in "street name" and will be
the sole responsibility of such participants.

    So long as the Depository or its nominee is the registered owner or holder
of such Global Security, the Depository or such nominee, as the case may be,
will be considered the sole owner or holder of the McLeodUSA notes represented
by such Global Security for the purposes of receiving payment on the McLeodUSA
notes, receiving notices and all other purposes under the McLeodUSA indenture
and the McLeodUSA notes. Beneficial interests in McLeodUSA notes will be
evidenced only by, and transfers thereof will be effected only through, records
maintained by the Depository and its participants. Except as provided above,
owners of beneficial interests in a Global Security will not be entitled to, and
will not be considered the holders of, such Global Security for any purposes
under the McLeodUSA indenture. Accordingly, each person owning a beneficial
interest in a Global Security must rely on the procedures of the Depository and,
if such person is not a participant, on the procedures of the participant
through which such person owns its interest, to exercise any rights of a holder
under the McLeodUSA indenture. McLeodUSA understands that, under existing
industry practices, in the event that McLeodUSA requests any action of holders
or that an owner of a beneficial interest in a Global Security desires to give
or take any action that a holder is entitled to give or take under the McLeodUSA
indenture, the Depository would authorize the participants holding the relevant
beneficial interest to give or take such action, and such participants would
authorize beneficial owners owning through such participants to give or take
such action or would otherwise act upon the instructions of beneficial owners
owning through them.

    The Depository has advised McLeodUSA that it will take any action permitted
to be taken by a holder of McLeodUSA notes, including the presentation of
McLeodUSA notes for exchange as described below, only at the direction of one or
more participants to whose account with the Depository interests in the Global
Security are credited and only in respect of such portion of the aggregate
principal amount of the McLeodUSA notes as to which such participant or
participants has or have given such direction.

    The Depository has advised McLeodUSA that the Depository is a
limited-purpose trust company organized under the Banking Law of the State of
New York, a "banking organization" within the meaning of the New York Banking
Law, a member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code and a "clearing agency"
registered under the Securities Exchange Act. The Depository was created to hold
the securities of its participants and to facilitate the clearance and
settlement of securities transactions among its participants in such securities
through electronic book-entry changes in accounts of the participants, thereby
eliminating the need for physical movement of securities certificates. The
Depository's participants include securities brokers and dealers including
banks, trust companies, clearing corporations and various other organizations,
some of whom, and/or their representatives, own the Depository. Access to the
Depository's book-entry system is also available to others, such as banks,
brokers, dealers and trust companies that clear through or maintain a custodial
relationship with a participant, either directly or indirectly, and dealers
including banks, trust companies, clearing corporations and various other
organizations some of whom, and/or their representatives, own the Depository.
Access to the Depository's book-entry system is also available to others, such
as banks,

                                       52
<PAGE>
brokers, dealers and trust companies that clear through or maintain a custodial
relationship with a participant, either directly or indirectly.

    The information in this section concerning the Depository and the
Depository's book-entry system has been obtained from sources that McLeodUSA
believes to be reliable, but McLeodUSA takes no responsibility for the accuracy
thereof.

CERTIFICATED NOTES

    The McLeodUSA notes represented by a Global Security are exchangeable for
certificated McLeodUSA notes only if:

    - the Depository notifies McLeodUSA that it is unwilling or unable to
      continue as a depository for such Global Security or if at any time the
      Depository ceases to be a clearing agency registered under the Securities
      Exchange Act, and a successor depository is not appointed by McLeodUSA
      within 90 days,

    - McLeodUSA executes and delivers to the trustee a notice that such Global
      Security shall be so transferable, registrable and exchangeable, and such
      transfer shall be registrable or

    - there shall have occurred and be continuing an Event of Default with
      respect to the McLeodUSA notes represented by such Global Security.

Any Global Security that is exchangeable for certificated McLeodUSA notes
pursuant to the preceding sentence will be transferred to, and registered and
exchanged for, certificated McLeodUSA notes in authorized denominations and
registered in such names as the Depository or its nominee holding such Global
Security may direct. Subject to the foregoing, a Global Security is not
exchangeable, except for a Global Security of like denomination to be registered
in the name of the Depository or its nominee. In the event that a Global
Security becomes exchangeable for certificated McLeodUSA notes:

    - certificated McLeodUSA notes will be issued only in fully registered form
      in denominations of $1,000 or integral multiples thereof,

    - payment of principal, any repurchase price, and interest on the
      certificated McLeodUSA notes will be payable, and the transfer of the
      certificated McLeodUSA notes will be registrable, at the office or agency
      of McLeodUSA maintained for such purposes, and

    - no service charge will be made for any issuance of the certificated
      McLeodUSA notes, although McLeodUSA may require payment of a sum
      sufficient to cover any tax or governmental charge imposed in connection
      therewith.

OPTIONAL REDEMPTION

    The McLeodUSA notes will be subject to redemption at the option of
McLeodUSA, in whole or in part, at any time on or after July 15, 2003 and prior
to maturity, upon not less than 30 nor more than 60 days' prior notice, in
amounts of $1,000 or an integral multiple of $1,000, at the redemption prices,
expressed as percentages of principal amount, set forth below, plus accrued and
unpaid interest thereon, if any, if redeemed during the twelve month periods
beginning July 15 of the years indicated below:

<TABLE>
<CAPTION>
YEAR                                                          PERCENTAGE
----                                                          ----------
<S>                                                           <C>
2003........................................................   106.000%
2004........................................................   104.000%
2005........................................................   102.000%
2006 and after..............................................   100.000%
</TABLE>

                                       53
<PAGE>
    If less than all of the McLeodUSA notes are to be redeemed at any time, the
trustee will select the McLeodUSA notes, or portions thereof, for redemption on
a pro rata basis, by lot or by such other method as the trustee in its sole
discretion shall deem to be fair and appropriate; provided that no McLeodUSA
note of $1,000 in principal amount or less shall be redeemed in part. If any
McLeodUSA note is to be redeemed in part only, the notice of redemption relating
to such McLeodUSA note shall state the portion of the principal amount thereof
to be redeemed. A new McLeodUSA note in principal amount equal to the unredeemed
portion thereof will be issued in the name of the holder thereof upon
cancellation of the original McLeodUSA note.

MANDATORY REDEMPTION

    Except as set forth under "--Repurchase at the Option of Holders upon a
Change of Control" and "--Asset Sales," McLeodUSA is not required to make
mandatory redemption payments or sinking fund payments with respect to the
McLeodUSA notes.

REPURCHASE AT THE OPTION OF HOLDERS UPON A CHANGE OF CONTROL

    Upon the occurrence of a Change of Control, each holder shall have the right
to require McLeodUSA to repurchase all or any part, equal to $1,000 principal
amount or an integral multiple thereof, of such holder's McLeodUSA notes
pursuant to the offer described below (the "Change of Control Offer") at a
purchase price (the "Change of Control Purchase Price") in cash equal to 101% of
the principal amount of the McLeodUSA notes plus accrued and unpaid interest, if
any, to any Change of Control Payment Date.

    Within 30 days following any Change of Control, McLeodUSA or the trustee, at
the request and expense of McLeodUSA, shall mail a notice to each holder
stating:

    - that a Change of Control Offer is being made pursuant to the covenant
      described under "--Repurchase at the Option of Holders upon a Change of
      Control" and that all McLeodUSA notes timely tendered will be accepted for
      payment;

    - the Change of Control Purchase Price and the purchase date (the "Change of
      Control Payment Date"), which shall be no earlier than 30 days nor later
      than 60 days from the date such notice is mailed;

    - that any McLeodUSA notes or portions thereof not tendered or accepted for
      payment will continue to accrue interest;

    - that, unless McLeodUSA defaults in the payment of the Change of Control
      Purchase Price, all McLeodUSA notes or portions thereof accepted for
      payment pursuant to the Change of Control Offer shall cease to accrue
      interest from and after the Change of Control Payment Date;

    - that holders electing to have any McLeodUSA notes or portions thereof
      purchased under a Change of Control Offer will be required to surrender
      their McLeodUSA notes before the close of business on the third Business
      Day preceding the Change of Control Payment Date;

    - that holders will be entitled to withdraw their election if the Paying
      Agent receives, not later than the close of business on the second
      Business Day preceding the Change of Control Payment Date, a telegram,
      telex, facsimile transmission or letter setting forth the name of the
      holder, the principal amount of McLeodUSA notes delivered for purchase,
      and a statement that such holder is withdrawing its election to have such
      McLeodUSA notes or portions thereof purchased;

    - that holders electing to have McLeodUSA notes purchased under the Change
      of Control Offer must specify the principal amount that is being tendered
      for purchase, which principal amount must be $1,000 or an integral
      multiple thereof;

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<PAGE>
    - that holders whose McLeodUSA notes are being purchased only in part will
      be issued new McLeodUSA notes equal in principal amount to the unpurchased
      portion of the McLeodUSA note or McLeodUSA notes surrendered, which
      unpurchased portion must be equal to $1,000 in principal amount or an
      integral multiple thereof; and

    - any other information necessary to enable any holder to tender McLeodUSA
      notes and to have such McLeodUSA notes purchased pursuant to the McLeodUSA
      indenture.

    McLeodUSA will comply with the requirements of Section 14(e) under the
Securities Exchange Act and any other securities laws or regulations, to the
extent such laws and regulations are applicable, in connection with the
repurchase of McLeodUSA notes under a Change of Control Offer.

    On the Change of Control Payment Date, McLeodUSA will:

    - accept for payment McLeodUSA notes or portions thereof properly tendered
      under the Change of Control Offer;

    - irrevocably deposit with the Paying Agent in immediately available funds
      an amount equal to the Change of Control Purchase Price in respect of all
      McLeodUSA notes or portions thereof so accepted; and

    - deliver, or cause to be delivered, to the trustee the McLeodUSA notes so
      accepted together with an Officers' Certificate listing the McLeodUSA
      notes or portions thereof tendered to McLeodUSA and accepted for payment.

The Paying Agent shall promptly mail to each holder of McLeodUSA notes so
accepted payment in an amount equal to the Change of Control Purchase Price for
such McLeodUSA notes, and the trustee shall promptly authenticate and mail to
each holder a new McLeodUSA note equal in principal amount to any unpurchased
portion of the McLeodUSA notes surrendered, if any; provided that each such new
McLeodUSA note shall be in a principal amount of $1,000 or any integral multiple
thereof.

    The existence of the holders' right to require, subject to several
conditions, McLeodUSA to repurchase McLeodUSA notes upon a Change of Control may
deter a third party from acquiring McLeodUSA in a transaction that constitutes a
Change of Control. If a Change of Control Offer is made, there can be no
assurance that McLeodUSA will have sufficient funds to pay the Change of Control
Purchase Price for all McLeodUSA notes tendered by holders seeking to accept the
Change of Control Offer. In addition, the Senior Secured Credit Facilities of
McLeodUSA prohibit and the instruments governing other indebtedness of McLeodUSA
may prohibit McLeodUSA from purchasing any McLeodUSA notes prior to their Stated
Maturity, including under a Change of Control Offer. In the event that a Change
of Control Offer occurs at a time when McLeodUSA does not have sufficient
available funds to pay the Change of Control Purchase Price for all McLeodUSA
notes tendered pursuant to such offer or at a time when McLeodUSA is prohibited
from purchasing the McLeodUSA notes, and McLeodUSA is unable either to obtain
the consent of the holders of the relevant indebtedness or to repay such
indebtedness, an Event of Default would occur under the McLeodUSA indenture. In
addition, one of the events that constitutes a Change of Control under the
McLeodUSA indenture is a sale, conveyance, transfer or lease of all or
substantially all of the property of McLeodUSA. The McLeodUSA indenture is
governed by New York law, and there is no established definition under New York
law of "substantially all" of the assets of a corporation. Accordingly, if
McLeodUSA were to engage in a transaction in which it disposed of less than all
of its assets, a question of interpretation could arise as to whether such
disposition was of "substantially all" of its assets and whether McLeodUSA was
required to make a Change of Control Offer.

    Except as described herein with respect to a Change of Control, the
McLeodUSA indenture does not contain any other provisions that permit holders of
McLeodUSA notes to require that McLeodUSA repurchase or redeem McLeodUSA notes
in the event of a takeover, recapitalization or similar restructuring.

                                       55
<PAGE>
ASSET SALES

    McLeodUSA will not, and will not permit any Restricted Subsidiary to,
consummate an Asset Sale unless:

    - McLeodUSA or such Restricted Subsidiary, as the case may be, receives
      consideration for such Asset Sale at least equal to the Fair Market Value,
      as evidenced by a Board Resolution delivered to the trustee, of the
      Property or assets sold or otherwise disposed of;

    - at least 75% of the consideration received by McLeodUSA or such Restricted
      Subsidiary for such Property or assets consists of (a) cash,
      readily-marketable cash equivalents, or Telecommunications Assets;
      (b) shares of publicly-traded Voting Stock of any Person engaged in the
      Telecommunications Business in the United States; or (c) the assumption of
      Indebtedness of McLeodUSA or such Restricted Subsidiary, other than
      Indebtedness that is subordinated to the McLeodUSA notes, and the release
      of McLeodUSA or the Restricted Subsidiary, as the case may be, from all
      liability on the Indebtedness assumed; and

    - McLeodUSA or such Restricted Subsidiary, as the case may be, uses the Net
      Cash Proceeds from such Asset Sale in the manner set forth in the next
      paragraph.

    Within 360 days after any Asset Sale, McLeodUSA or such Restricted
Subsidiary, as the case may be, may at its option:

    - reinvest an amount equal to the Net Cash Proceeds, or any portion thereof
      from such Asset Sale in Telecommunications Assets or in Capital Stock of
      any Person engaged in the Telecommunications Business and/or

    - apply an amount equal to such Net Cash Proceeds, or remaining Net Cash
      Proceeds, to the permanent reduction of Indebtedness of McLeodUSA, other
      than Indebtedness to a Restricted Subsidiary, that is senior to or PARI
      PASSU with the McLeodUSA notes or to the permanent reduction of
      Indebtedness or preferred stock of any Restricted Subsidiary, other than
      Indebtedness to, or preferred stock owned by, McLeodUSA or another
      Restricted Subsidiary.

Any Net Cash Proceeds from any Asset Sale that are not used to reinvest in
Telecommunications Assets or in Capital Stock of any Person engaged in the
Telecommunications Business and/or to reduce senior or PARI PASSU Indebtedness
of McLeodUSA or Indebtedness or preferred stock of its Restricted Subsidiaries
shall constitute Excess Proceeds.

    If at any time the aggregate amount of Excess Proceeds calculated as of such
date exceeds $25 million, McLeodUSA shall, within 30 days, use such Excess
Proceeds to make an offer to purchase (an "Asset Sale Offer") on a pro rata
basis, from all holders, McLeodUSA notes in an aggregate principal amount equal
to the maximum principal amount that may be purchased out of Excess Proceeds, at
a purchase price (the "Asset Sale Purchase Price") in cash equal to 100% of the
principal amount thereof plus accrued and unpaid interest, if any, to the
purchase date, in accordance with the procedures set forth in the McLeodUSA
indenture. Upon completion of an Asset Sale Offer, including payment of the
Asset Sale Purchase Price, any surplus Excess Proceeds that were the subject of
such offer shall cease to be Excess Proceeds, and McLeodUSA may then use such
amounts for general corporate purposes.

    McLeodUSA will comply with the requirements of Section 14(e) under the
Securities Exchange Act and any other securities laws or regulations, to the
extent such laws and regulations are applicable, in connection with the
repurchase of McLeodUSA notes pursuant to an Asset Sale Offer.

                                       56
<PAGE>
COVENANTS

    Set forth below are several covenants that are contained in the McLeodUSA
indenture:

    LIMITATION ON CONSOLIDATED INDEBTEDNESS

    McLeodUSA will not, and will not permit any Restricted Subsidiary to, Incur
any Indebtedness after the Issue Date unless either:

    1.  the ratio of:

       - the aggregate consolidated principal amount of Indebtedness of
         McLeodUSA outstanding as of the most recent available quarterly or
         annual balance sheet, after giving pro forma effect to the Incurrence
         of such Indebtedness and any other Indebtedness Incurred since such
         balance sheet date and the receipt and application of the proceeds
         thereof, to

       - Consolidated Cash Flow Available for Fixed Charges for the four full
         fiscal quarters immediately preceding the Incurrence of such
         Indebtedness for which consolidated financial statements of McLeodUSA
         have been filed with the SEC or have otherwise become publicly
         available, determined on a pro forma basis as if any such Indebtedness
         had been Incurred and the proceeds thereof had been applied at the
         beginning of such four fiscal quarters

       would be less than 5.5 to 1.0 for such four-quarter periods ending prior
       to December 31, 2000 and 5.0 to 1.0 for such periods ending thereafter,
       or

    2.  McLeodUSA's Consolidated Capital Ratio as of the most recent quarterly
or annual balance sheet of McLeodUSA that has been filed with the SEC or has
otherwise become publicly available, after giving pro forma effect to:

       - the Incurrence of such Indebtedness and any other Indebtedness Incurred
         since such balance sheet date, and

       - paid-in capital received since such balance sheet date or concurrently
         with the Incurrence of such Indebtedness, and in each case the receipt
         and application of the proceeds thereof,

       is less than 2.0 to 1.0.

    Notwithstanding the foregoing limitation, McLeodUSA and any Restricted
Subsidiary may Incur each and all of the following:

    1.  Indebtedness under Senior Credit Facilities in an aggregate principal
amount outstanding or available at any one time not to exceed $100 million, and
any renewal, extension, refinancing or refunding thereof in an amount which,
together with any principal amount remaining outstanding or available under all
Senior Credit Facilities, does not exceed the aggregate principal amount
outstanding or available under all Senior Credit Facilities immediately before
such renewal, extension, refinancing or refunding;

    2.  Indebtedness under Qualified Receivable Facilities in an aggregate
principal amount outstanding or available at any one time not to exceed the
greater of (x) $150 million or (y) an amount equal to 85% of net Receivables
determined in accordance with GAAP, and any renewal, extension, refinancing or
refunding thereof in an amount which, together with any principal amount
remaining outstanding or available under all Qualified Receivable Facilities,
does not exceed the aggregate principal amount outstanding or available under
all Qualified Receivable Facilities immediately before such renewal, extension,
refinancing or refunding;

    3.  Purchase Money Indebtedness, provided that the amount of such Purchase
Money Indebtedness does not exceed 90% of the cost of the construction,
acquisition or improvement of the applicable Telecommunications Assets;

                                       57
<PAGE>
    4.  Indebtedness owed by McLeodUSA to any Wholly-Owned Restricted Subsidiary
of McLeodUSA or Indebtedness owed by a Restricted Subsidiary of McLeodUSA to
McLeodUSA or a Wholly-Owned Restricted Subsidiary of McLeodUSA; provided that
upon either (x) the transfer or other disposition by such Wholly-Owned
Restricted Subsidiary or McLeodUSA of any Indebtedness so permitted to a Person
other than McLeodUSA or another Wholly-Owned Restricted Subsidiary of McLeodUSA
or (y) the issuance, other than directors' qualifying share, sale, lease,
transfer or other disposition of shares of Capital Stock, including by
consolidation or merger, of such Wholly-Owned Restricted Subsidiary to a Person
other than McLeodUSA or another such Wholly-Owned Restricted Subsidiary, the
provisions of this clause 4 shall no longer be applicable to such Indebtedness
and such Indebtedness shall be deemed to have been Incurred at the time of such
transfer or other disposition;

    5.  Indebtedness Incurred to renew, extend, refinance or refund (each, a
"refinancing") the McLeodUSA notes or Indebtedness outstanding at the date of
the McLeodUSA indenture or Purchase Money Indebtedness Incurred pursuant to
clause 3 above in an aggregate principal amount not to exceed the aggregate
principal amount of and accrued interest on the Indebtedness so refinanced plus
the amount of any premium required to be paid in connection with such
refinancing pursuant to the terms of the Indebtedness so refinanced or the
amount of any premium reasonably determined by McLeodUSA as necessary to
accomplish such refinancing by means of a tender offer or privately negotiated
repurchase, plus the expenses of McLeodUSA incurred in connection with such
refinancing; provided that Indebtedness the proceeds of which are used to
refinance the McLeodUSA notes or Indebtedness which is PARI PASSU to the
McLeodUSA notes or Indebtedness which is subordinate in right of payment to the
McLeodUSA notes shall only be permitted under this clause 5 if (A) in the case
of any refinancing of the McLeodUSA notes or Indebtedness which is PARI PASSU to
the McLeodUSA notes, the refinancing Indebtedness is made PARI PASSU to the
McLeodUSA notes or constitutes Subordinated Indebtedness, and, in the case of
any refinancing of Subordinated Indebtedness, the refinancing Indebtedness
constitutes Subordinated Indebtedness and (B) in any case, the refinancing
Indebtedness by its terms, or by the terms of any agreement or instrument
pursuant to which such Indebtedness is issued, (x) does not provide for payments
of principal of such Indebtedness at stated maturity or by way of a sinking fund
applicable thereto or by way of any mandatory redemption, defeasance, retirement
or repurchase thereof by McLeodUSA, including any redemption, retirement or
repurchase which is contingent upon events or circumstances, but excluding any
retirement required by virtue of the acceleration of any payment with respect to
such Indebtedness upon any event of default thereunder, in each case prior to
the time the same are required by the terms of the Indebtedness being refinanced
and (y) does not permit redemption or other retirement, including pursuant to an
offer to purchase made by McLeodUSA, of such Indebtedness at the option of the
holder thereof prior to the time the same are required by the terms of the
Indebtedness being refinanced, other than a redemption or other retirement at
the option of the holder of such Indebtedness, including pursuant to an offer to
purchase made by McLeodUSA, which is conditioned upon a change of control
pursuant to provisions substantially similar to those described under
"--Repurchase at the Option of Holders upon a Change of Control;"

    6.  Indebtedness consisting of Permitted Interest Rate and Currency
Protection Agreements;

    7.  Indebtedness (A) in respect of performance, surety or appeal bonds
provided in the ordinary course of business or (B) arising from customary
agreements providing for indemnification, adjustment of purchase price for
closing balance sheet changes within 90 days after closing, or similar
obligations, or from Guarantees or letters of credit, surety bonds or
performance bonds securing any obligations of McLeodUSA or any of its Restricted
Subsidiaries pursuant to such agreements, in each case Incurred in connection
with the disposition of any business, assets or Restricted Subsidiary of
McLeodUSA, other than Guarantees of Indebtedness Incurred by any Person
acquiring all or any portion of such business, assets or Restricted Subsidiary
of McLeodUSA for the purpose of financing such acquisition,

                                       58
<PAGE>
and in an aggregate principal amount not to exceed the gross proceeds actually
received by McLeodUSA or any Restricted Subsidiary in connection with such
disposition; and

    8.  Indebtedness not otherwise permitted to be Incurred pursuant to clauses
1 through 7 above, which, together with any other outstanding Indebtedness
Incurred pursuant to this clause 8, has an aggregate principal amount not in
excess of $10 million at any time outstanding.

    Notwithstanding any other provision of this "--Covenants--Limitation on
Consolidated Indebtedness" covenant, the maximum amount of Indebtedness that
McLeodUSA or a Restricted Subsidiary may incur pursuant to this
"--Covenants--Limitation on Consolidated Indebtedness" covenant shall not be
deemed to be exceeded due solely as the result of fluctuations in the exchange
rates of currencies.

    For purposes of determining any particular amount of Indebtedness under this
"--Covenants--Limitation on Consolidated Indebtedness" covenant:

    1.  Guarantees, Liens or obligations with respect to letters of credit
supporting Indebtedness otherwise included in the determination of such
particular amount shall not be included and

    2.  any Liens granted pursuant to the equal and ratable provisions referred
to in the "--Covenants--Limitation on Liens" covenant described below shall not
be treated as Indebtedness.

For purposes of determining compliance with this "--Covenants--Limitation on
Consolidated Indebtedness" covenant, in the event that an item of Indebtedness
meets the criteria of more than one of the types of Indebtedness described in
the above clauses, McLeodUSA, in its sole discretion, shall classify such item
of Indebtedness and only be required to include the amount and type of such
Indebtedness in one of such clauses.

    LIMITATION ON INDEBTEDNESS AND PREFERRED STOCK OF RESTRICTED SUBSIDIARIES

    McLeodUSA will not permit any Restricted Subsidiary of McLeodUSA to Incur
any Indebtedness or issue any Preferred Stock except:

    1.  Indebtedness or Preferred Stock outstanding on the date of the McLeodUSA
indenture after giving effect to the application of the proceeds of the
McLeodUSA notes;

    2.  Indebtedness Incurred or Preferred Stock issued to and held by McLeodUSA
or a Wholly-Owned Restricted Subsidiary of McLeodUSA, provided that such
Indebtedness or Preferred Stock is at all times held by McLeodUSA or a
Wholly-Owned Restricted Subsidiary of McLeodUSA;

    3.  Indebtedness Incurred or Preferred Stock issued by a Person prior to the
time (A) such Person became a Restricted Subsidiary of McLeodUSA, (B) such
Person merges into or consolidates with a Restricted Subsidiary of McLeodUSA or
(C) another Restricted Subsidiary of McLeodUSA merges into or consolidates with
such Person in a transaction in which such Person becomes a Restricted
Subsidiary of McLeodUSA, which Indebtedness or Preferred Stock was not Incurred
or issued in anticipation of such transaction and was outstanding prior to such
transaction;

    4.  Indebtedness under a Senior Credit Facility which is permitted to be
outstanding under clause 1 of the second paragraph of "--Covenants--Limitation
on Consolidated Indebtedness;"

    5.  in the case of a Restricted Subsidiary that is a Qualified Receivable
Subsidiary, Indebtedness under a Qualified Receivable Facility which is
permitted to be outstanding under clause 2 of the second paragraph of
"--Covenants--Limitation on Consolidated Indebtedness;"

    6.  Indebtedness consisting of Permitted Interest Rate and Currency
Protection Agreements;

    7.  Indebtedness (A) in respect of performance, surety and appeal bonds
provided in the ordinary course of business or (B) arising from customary
agreements providing for indemnification, adjustment

                                       59
<PAGE>
of purchase price for closing balance sheet changes within 90 days after
closing, or similar obligations, or from Guarantees or letters of credit, surety
bonds or performance bonds securing any obligation of such Restricted Subsidiary
pursuant to such agreements, in each case Incurred in connection with the
disposition of any business, assets or Restricted Subsidiary of such Restricted
Subsidiary, other than Guarantees of Indebtedness Incurred by any Person
acquiring all or any portion of such business, assets or Restricted Subsidiary
for the purpose of financing such acquisition, and in an aggregate principal
amount not to exceed the gross proceeds actually received by such Restricted
Subsidiary in connection with such disposition;

    8.  Indebtedness or Preferred Stock which is exchanged for, or the proceeds
of which are used to refinance, refund or redeem, any Indebtedness or Preferred
Stock permitted to be outstanding pursuant to clauses 1 and 3 above or any
extension or renewal thereof (for purposes hereof, a "refinancing"), in an
aggregate principal amount, in the case of Indebtedness, or with an aggregate
liquidation preference in the case of Preferred Stock, not to exceed the
aggregate principal amount of the Indebtedness so refinanced or the aggregate
liquidation preference of the Preferred Stock so refinanced, plus the amount of
any premium required to be paid in connection with such refinancing pursuant to
the terms of the Indebtedness or Preferred Stock so refinanced or the amount of
any premium reasonably determined by McLeodUSA as necessary to accomplish such
refinancing by means of a tender offer or privately negotiated repurchase, plus
the amount of expenses of McLeodUSA and the applicable Restricted Subsidiary
Incurred in connection therewith and provided the Indebtedness or Preferred
Stock Incurred or issued upon such refinancing by its terms, or by the terms of
any agreement or instrument pursuant to which such Indebtedness or Preferred
Stock is Incurred or issued, (x) does not provide for payments of principal or
liquidation value at the stated maturity of such Indebtedness or Preferred Stock
or by way of a sinking fund applicable to such Indebtedness or Preferred Stock
or by way of any mandatory redemption, defeasance, retirement or repurchase of
such Indebtedness or Preferred Stock by McLeodUSA or any Restricted Subsidiary
of McLeodUSA, including any redemption, retirement or repurchase which is
contingent upon events or circumstances, but excluding any retirement required
by virtue of acceleration of such Indebtedness upon an event of default
thereunder, in each case prior to the time the same are required by the terms of
the Indebtedness or Preferred Stock being refinanced and (y) does not permit
redemption or other retirement, including under an offer to purchase made by
McLeodUSA or a Restricted Subsidiary of McLeodUSA, of such Indebtedness or
Preferred Stock at the option of the holder thereof prior to the stated maturity
of the Indebtedness or Preferred Stock being refinanced, other than a redemption
or other retirement at the option of the holder of such Indebtedness or
Preferred Stock, including pursuant to an offer to purchase made by McLeodUSA or
a Restricted Subsidiary of McLeodUSA, which is conditioned upon the change of
control of McLeodUSA pursuant to provisions substantially similar to those
described under "--Repurchase at the Option of Holders upon a Change of Control"
and provided, further, that in the case of any exchange or redemption of
Preferred Stock of a Restricted Subsidiary of McLeodUSA, such Preferred Stock
may only be exchanged for or redeemed with Preferred Stock of such Restricted
Subsidiary; and

    9.  Indebtedness Incurred or Preferred Stock issued by a Restricted
Subsidiary, provided that the Fair Market Value of McLeodUSA's Investment in all
Restricted Subsidiaries which Incur Indebtedness or issue Preferred Stock
pursuant to this clause 9 shall not exceed, at any time, $30 million in the
aggregate, provided further, that such Indebtedness Incurred is otherwise
permitted pursuant to the covenant described under "--Covenants--Limitation on
Consolidated Indebtedness."

    LIMITATION ON RESTRICTED PAYMENTS

    McLeodUSA will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, make any Restricted Payment unless, at the time of
and after giving effect to such proposed Restricted Payment:

                                       60
<PAGE>
    - no Default or Event of Default shall have occurred and be continuing or
      shall occur as a consequence thereof;

    - after giving effect, on a pro forma basis, to such Restricted Payment and
      the incurrence of any Indebtedness the net proceeds of which are used to
      finance such Restricted Payment, McLeodUSA could incur at least $1.00 of
      additional Indebtedness pursuant to the first paragraph of
      "--Covenants--Limitation on Consolidated Indebtedness;" and

    - after giving effect to such Restricted Payment on a pro forma basis, the
      aggregate amount expended (the amount so expended, if other than cash, to
      be determined in good faith by a majority of the disinterested members of
      the board of directors, whose determination shall be conclusive and
      evidenced by a resolution thereof) or declared for all Restricted Payments
      after February 22, 1999 does not exceed the sum of (A) 50% of the
      Consolidated Net Income of McLeodUSA (or, if Consolidated Net Income shall
      be a deficit, minus 100% of such deficit) for the period (taken as one
      accounting period) beginning on the last day of the fiscal quarter
      immediately preceding February 22, 1999 and ending on the last day of the
      fiscal quarter for which McLeodUSA's financial statements have been filed
      with the SEC or otherwise become publicly available immediately preceding
      the date of such Restricted Payment, plus (B) 100% of the net reduction in
      Investments, subsequent to February 22, 1999, in any Person, resulting
      from payments of interest on Indebtedness, dividends, repayments of loans
      or advances, or other transfers of Property (but only to the extent such
      interest, dividends, repayments or other transfers of Property are not
      included in the calculation of Consolidated Net Income), in each case to
      McLeodUSA or any Restricted Subsidiary from any Person (including, without
      limitation, from Unrestricted Subsidiaries) or from redesignations of
      Unrestricted Subsidiaries as Restricted Subsidiaries (valued in each case
      as provided in the definition of "Investments"), not to exceed in the case
      of any Person the amount of Investments previously made subsequent to
      February 22, 1999 by McLeodUSA or any Restricted Subsidiary in such Person
      and which was treated as a Restricted Payment; PROVIDED that McLeodUSA or
      a Restricted Subsidiary of McLeodUSA may make any Restricted Payment with
      the aggregate net proceeds received after February 22, 1999, including the
      fair value of property other than cash (determined in good faith by the
      board of directors as evidenced by a resolution of the board of directors
      filed with the trustee),

       (x) as capital contributions to McLeodUSA,

       (y) from the issuance (other than to a Restricted Subsidiary) of Capital
           Stock (other than Disqualified Stock) of McLeodUSA and warrants,
           rights or options on Capital Stock (other than Disqualified Stock) of
           McLeodUSA, or

       (z) from the conversion of Indebtedness of McLeodUSA into Capital Stock
           (other than Disqualified Stock and other than by a Restricted
           Subsidiary) of McLeodUSA after February 22, 1999.

    The foregoing limitations shall not prevent McLeodUSA from:

    1.  paying a dividend on its Capital Stock at any time within 60 days after
the declaration thereof if, on the declaration date, McLeodUSA could have paid
such dividend in compliance with the preceding paragraph;

    2.  retiring (A) any Capital Stock of McLeodUSA or any Restricted Subsidiary
of McLeodUSA, (B) Indebtedness of McLeodUSA that is subordinate to the McLeodUSA
notes, or (C) Indebtedness of a Restricted Subsidiary of McLeodUSA, in exchange
for, or out of the proceeds of the substantially concurrent sale of Qualified
Stock of McLeodUSA;

    3.  retiring any Indebtedness of McLeodUSA subordinated in right of payment
to the McLeodUSA notes in exchange for, or out of the proceeds of, the
substantially concurrent incurrence

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<PAGE>
of Indebtedness of McLeodUSA (other than Indebtedness to a Subsidiary of
McLeodUSA), provided that such new Indebtedness (A) is subordinated in right of
payment to the McLeodUSA notes at least to the same extent as, (B) has an
Average Life at least as long as, and (C) has no scheduled principal payments
due in any amount earlier than, any equivalent amount of principal under the
Indebtedness so retired;

    4.  retiring any Indebtedness of a Restricted Subsidiary of McLeodUSA in
exchange for, or out of the proceeds of, the substantially concurrent incurrence
of Indebtedness of McLeodUSA or any Restricted Subsidiary that is permitted
under the covenant described under "--Covenants--Limitation on Consolidated
Indebtedness" (in the case of Indebtedness of McLeodUSA) and "--Covenants--
Limitation on Indebtedness and Preferred Stock of Restricted Subsidiaries" (in
the case of Indebtedness of Restricted Subsidiaries) and that (A) is not secured
by any assets of McLeodUSA or any Restricted Subsidiary to a greater extent than
the retired Indebtedness was so secured, (B) has an Average Life at least as
long as the retired Indebtedness, and (C) is subordinated in right of payment to
the McLeodUSA notes at least to the same extent as the retired Indebtedness;

    5.  retiring any Capital Stock or options to acquire Capital Stock of
McLeodUSA or any Restricted Subsidiary of McLeodUSA held by any directors,
officers or employees of McLeodUSA or any Restricted Subsidiary, provided that
the aggregate price paid for all such retired Capital Stock shall not exceed, in
the aggregate, the sum of $2 million plus the aggregate cash proceeds received
by McLeodUSA subsequent to the Issue Date from issuances of Capital Stock or
options to acquire Capital Stock by McLeodUSA to directors, officers or
employees of McLeodUSA and its Subsidiaries;

    6.  making payments or distributions to dissenting stockholders pursuant to
applicable law in connection with a consolidation, merger or transfer of assets
permitted under "--Consolidation, Merger, Conveyance, Lease or Transfer;"

    7.  retiring any Capital Stock of McLeodUSA to the extent necessary (as
determined in good faith by a majority of the disinterested members of the board
of directors, whose determination shall be conclusive and evidenced by a
resolution thereof) to prevent the loss, or to secure the renewal or
reinstatement, of any license or franchise held by McLeodUSA or any Restricted
Subsidiary from any governmental agency;

    8.  making Investments in any Person primarily engaged in the
Telecommunications Business; provided, that the aggregate amount of such
Investments does not exceed at any time the sum of (A) $30 million plus (B) the
amount of Net Cash Proceeds received by McLeodUSA after February 22, 1999 as a
capital contribution or from the sale of its Capital Stock (other than
Disqualified Stock) to a Person who is not a Subsidiary of McLeodUSA, except to
the extent such Net Cash Proceeds are used to make Restricted Payments permitted
pursuant to clauses (x), (y) and (z) of the first paragraph, or clause 2 above
or this clause 8, of this "Limitation on Restricted Payments" covenant, plus (C)
the net reduction in Investments made pursuant to this clause 8 resulting from
distributions on or repayments of such Investments or from the Net Cash Proceeds
from the sale of any such Investment (except in each case to the extent any such
payment or proceeds are included in the calculation of Consolidated Net Income)
or from such Person becoming a Restricted Subsidiary (valued in each case as
provided in the definition of "Investment"), provided that the net reduction in
any Investment shall not exceed the amount of such Investment; and

    9.  making Investments not otherwise permitted in an aggregate amount not to
exceed $15 million at any time outstanding.

    In determining the amount of Restricted Payments permissible under this
covenant, amounts expended pursuant to clauses 2, 3 and 4 above shall not be
included as Restricted Payments. Not later than the date of making any
Restricted Payment (including any Restricted Payment permitted to be made
pursuant to the two previous paragraphs), McLeodUSA shall deliver to the trustee
an Officers'

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Certificate stating that such Restricted Payment is permitted and setting forth
the basis upon which the required calculations were computed, which calculations
may be based upon McLeodUSA's latest available financial statements.

    LIMITATION ON LIENS

    McLeodUSA may not, and may not permit any Restricted Subsidiary of McLeodUSA
to, Incur or suffer to exist any Lien on or with respect to any property or
assets now owned or hereafter acquired to secure any Indebtedness without
making, or causing such Restricted Subsidiary to make, effective provision for
securing the McLeodUSA notes (x) equally and ratably with such Indebtedness as
to such property for so long as such Indebtedness will be so secured or (y) in
the event such Indebtedness is Indebtedness of McLeodUSA which is subordinate in
right of payment to the McLeodUSA notes, prior to such Indebtedness as to such
property for so long as such Indebtedness will be so secured.

    The foregoing restrictions shall not apply to:

    1.  Liens existing on the date of the McLeodUSA indenture and securing
Indebtedness outstanding on the date of the McLeodUSA indenture or Incurred on
or after the Issue Date pursuant to any Senior Credit Facility or Qualified
Receivable Facility;

    2.  Liens securing Indebtedness in an amount which, together with the
aggregate amount of Indebtedness then outstanding or available under all Senior
Credit Facilities (or under refinancings or amendments of such Senior Credit
Facilities), does not exceed 1.5 times McLeodUSA's Consolidated Cash Flow
Available for Fixed Charges for the four full fiscal quarters preceding the
Incurrence of such Lien for which McLeodUSA's consolidated financial statements
have been filed with the SEC or become publicly available, determined on a pro
forma basis as if such Indebtedness had been Incurred and the proceeds thereof
had been applied at the beginning of such four fiscal quarters;

    3.  Liens in favor of McLeodUSA or any Wholly-Owned Restricted Subsidiary of
McLeodUSA;

    4.  Liens on Property of McLeodUSA or a Restricted Subsidiary acquired,
constructed or constituting improvements made after the Issue Date of the
McLeodUSA notes to secure Purchase Money Indebtedness which is otherwise
permitted under the McLeodUSA indenture, provided that (a) the principal amount
of any Indebtedness secured by any such Lien does not exceed 100% of such
purchase price or cost of construction or improvement of the Property subject to
such Lien, (b) such Lien attaches to such property prior to, at the time of or
within 180 days after the acquisition, completion of construction or
commencement of operation of such Property and (c) such Lien does not extend to
or cover any Property other than the specific item of Property (or portion
thereof) acquired, constructed or constituting the improvements made with the
proceeds of such Purchase Money Indebtedness;

    5.  Liens to secure Acquired Indebtedness, provided that (a) such Lien
attaches to the acquired asset prior to the time of the acquisition of such
asset and (b) such Lien does not extend to or cover any other Property;

    6.  Liens to secure Indebtedness Incurred to extend, renew, refinance or
refund (or successive extensions, renewals, refinancings or refundings), in
whole or in part, Indebtedness secured by any Lien referred to in the foregoing
clauses 1, 2, 4 and 5 so long as such Lien does not extend to any other Property
and the principal amount of Indebtedness so secured is not increased except as
otherwise permitted under clause 5 of the second paragraph of
"--Covenants--Limitation on Consolidated Indebtedness" (in the case of
Indebtedness of McLeodUSA) or clause 8 of "--Covenants--Limitation on
Indebtedness and Preferred Stock of Restricted Subsidiaries" (in the case of
Indebtedness of Restricted Subsidiaries);

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    7.  Liens not otherwise permitted by the foregoing clauses 1 through 6 in an
aggregate amount not to exceed 5% of McLeodUSA's Consolidated Tangible Assets;

    8.  Liens granted after the Issue Date pursuant to the immediately preceding
paragraph to secure the McLeodUSA notes; and

    9.  Permitted Liens.

    LIMITATION ON SALE AND LEASEBACK TRANSACTIONS

    McLeodUSA will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, enter into, assume, Guarantee or otherwise become
liable with respect to any Sale and Leaseback Transaction (other than a Sale and
Leaseback Transaction between McLeodUSA or a Restricted Subsidiary on the one
hand and a Restricted Subsidiary or McLeodUSA on the other hand), unless:

    1.  McLeodUSA or such Restricted Subsidiary, as the case may be, receives
consideration at the time of such Sale and Leaseback Transaction at least equal
to the Fair Market Value, as evidenced by a Board Resolution delivered to the
trustee, of the Property subject to such transaction;

    2.  the Attributable Indebtedness of McLeodUSA or such Restricted Subsidiary
with respect thereto is included as Indebtedness and would be permitted by the
covenant described under "--Covenants--Limitation on Consolidated Indebtedness"
or "--Covenants--Limitation on Indebtedness and Preferred Stock of Restricted
Subsidiaries," as the case may be;

    3.  McLeodUSA or such Restricted Subsidiary would be permitted to create a
Lien on such Property without securing the McLeodUSA notes by the covenant
described under "--Covenants--Limitation on Liens;" and

    4.  the Net Cash Proceeds from such transaction are applied in accordance
with the covenant described under "--Asset Sales;"

provided that McLeodUSA shall be permitted to enter into Sale and Leaseback
Transactions for up to $30 million with respect to construction of McLeodUSA's
headquarters buildings located in Cedar Rapids, Iowa, provided that any such
transaction is entered into within 180 days of the earlier of (x) substantial
completion or (y) occupation of the applicable phase of such headquarters
building.

    LIMITATION ON DIVIDENDS AND OTHER PAYMENT RESTRICTIONS AFFECTING RESTRICTED
     SUBSIDIARIES

    McLeodUSA will not, and will not permit any Restricted Subsidiary to,
directly or indirectly, cause or suffer to exist or become effective, or enter
into, any encumbrance or restriction, other than by law or regulation, on the
ability of any Restricted Subsidiary to:

    1.  pay dividends or make any other distributions in respect of its Capital
Stock or pay any Indebtedness or other obligation owed to McLeodUSA or any
Restricted Subsidiary;

    2.  make loans or advances to McLeodUSA or any Restricted Subsidiary; or

    3.  transfer any of its Property to McLeodUSA or any other Restricted
Subsidiary,

except:

    (a) any encumbrance or restriction existing as of the Issue Date under the
McLeodUSA indenture or any other agreement relating to any Existing Indebtedness
or any Indebtedness under a Qualified Receivable Facility otherwise permitted
under the McLeodUSA indenture;

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    (b) any encumbrance or restriction under an agreement relating to an
acquisition of Property, so long as the encumbrances or restrictions in any such
agreement relate solely to the Property so acquired;

    (c) any encumbrance or restriction relating to any Indebtedness of any
Restricted Subsidiary existing on the date on which such Restricted Subsidiary
is acquired by McLeodUSA or another Restricted Subsidiary (other than any such
Indebtedness Incurred by such Restricted Subsidiary in connection with or in
anticipation of such acquisition);

    (d) any encumbrance or restriction under an agreement effecting a permitted
refinancing of Indebtedness issued under an agreement referred to in the
foregoing clauses (a) through (c), so long as the encumbrances and restrictions
contained in any such refinancing agreement are not materially more restrictive
than the encumbrances and restrictions contained in such agreements;

    (e) customary provisions (A) that restrict the subletting, assignment or
transfer of any property or asset that is a lease, license, conveyance or
contract or similar property or asset; (B) existing by virtue of any transfer
of, agreement to transfer, option or right with respect to, or Lien on, any
property or assets of McLeodUSA or any Restricted Subsidiary not otherwise
prohibited by the McLeodUSA indenture or (C) arising or agreed to in the
ordinary course of business, not relating to any Indebtedness, and that do not,
individually or in the aggregate, detract from the value of property or assets
of McLeodUSA or any Restricted Subsidiary in any manner material to McLeodUSA or
any Restricted Subsidiary;

    (f) in the case of clause (3) above, restrictions contained in any security
agreement, including a Capital Lease Obligation, securing Indebtedness of
McLeodUSA or a Restricted Subsidiary otherwise permitted under the McLeodUSA
indenture, but only to the extent such restrictions restrict the transfer of the
property subject to such security agreement; and

    (g) any restriction with respect to a Restricted Subsidiary of McLeodUSA
imposed by an agreement which has been entered into for the sale or disposition
of all or substantially all of the Capital Stock or assets of such Restricted
Subsidiary, provided that the consummation of such transaction would not result
in an Event of Default or an event that, with the passing of time or the giving
of notice or both, would constitute an Event of Default, that such restriction
terminates if such transaction is not consummated and that the consummation or
abandonment of such transaction occurs within one year of the date such
agreement was entered into.

    Nothing contained in this "--Covenants--Limitation on Dividend and Other
Payment Restrictions Affecting Restricted Subsidiaries" covenant shall prevent
McLeodUSA or any Restricted Subsidiary from (1) creating, incurring, assuming or
suffering to exist any Liens otherwise permitted under the
"--Covenants--Limitation on Liens" covenant or (2) restricting the sale or other
disposition of property or assets of McLeodUSA or any of its Restricted
Subsidiaries that secure Indebtedness of McLeodUSA or any of its Restricted
Subsidiaries otherwise permitted under "--Covenants--Limitation on Consolidated
Indebtedness" or "--Covenants--Limitations on Indebtedness and Preferred Stock
of Restricted Subsidiaries," as the case may be.

    LIMITATION ON ISSUANCE AND SALE OF CAPITAL STOCK OF RESTRICTED SUBSIDIARIES

    McLeodUSA (i) shall not permit any Restricted Subsidiary to issue any
Capital Stock other than to McLeodUSA or a Wholly-Owned Restricted Subsidiary
unless immediately after giving effect thereto such Restricted Subsidiary would
no longer constitute a Restricted Subsidiary and any Investment of McLeodUSA or
any other Restricted Subsidiary in such Restricted Subsidiary would have been
permitted under "--Covenants--Limitation on Restricted Payments" if made on the
date of such issuance and (ii) shall not permit any Person other than McLeodUSA
or a Wholly-Owned Restricted

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Subsidiary to own any Capital Stock of any Restricted Subsidiary, other than
directors' qualifying shares and except for:

    (a) a sale of 100% of the Capital Stock of a Restricted Subsidiary sold in a
transaction not prohibited by the covenant described under "--Asset Sales;"

    (b) a sale of the Capital Stock of a Restricted Subsidiary sold in a
transaction not prohibited by the covenant described under "--Asset Sales" if,
after giving effect thereto, greater than 50% of the Capital Stock of such
Restricted Subsidiary is owned by McLeodUSA or by a Wholly-Owned Restricted
Subsidiary;

    (c) Capital Stock of a Restricted Subsidiary issued and outstanding on the
Issue Date and held by Persons other than McLeodUSA or any Restricted
Subsidiary;

    (d) Capital Stock of a Restricted Subsidiary issued and outstanding prior to
the time that such Person becomes a Restricted Subsidiary so long as such
Capital Stock was not issued in anticipation or contemplation of such Person's
becoming a Restricted Subsidiary or otherwise being acquired by McLeodUSA;

    (e) any Preferred Stock permitted to be issued under
"--Covenants--Limitation on Indebtedness and Preferred Stock of Restricted
Subsidiaries;" and

    (f) ownership by any Person other than McLeodUSA or a Subsidiary of less
than 50% of the Capital Stock of a Person (A) in which McLeodUSA or a Restricted
Subsidiary has made a Permitted Investment pursuant to clause (3) of the
definition of "Permitted Investments," (B) of which more than 50% of such
Person's Capital Stock is owned, directly or indirectly, by McLeodUSA and
(C) as to which McLeodUSA has the power to direct the policies, management and
affairs.

    TRANSACTIONS WITH AFFILIATES

    McLeodUSA will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, sell, lease, transfer, or otherwise dispose of, any
of its Properties or assets to, or purchase any Property or assets from, or
enter into any contract, agreement, understanding, loan, advance or Guarantee
with or for the benefit of, any Affiliate (each of the foregoing, an "Affiliate
Transaction"), unless:

    (a) such Affiliate Transaction or series of Affiliate Transactions is on
terms that are no less favorable to McLeodUSA or such Restricted Subsidiary than
those that would have been obtained in a comparable arm's-length transaction by
McLeodUSA or such Restricted Subsidiary with a Person that is not an Affiliate
(or, in the event that there are no comparable transactions involving Persons
who are not Affiliates of McLeodUSA or the relevant Restricted Subsidiary to
apply for comparative purposes, is otherwise on terms that, taken as a whole,
McLeodUSA has determined to be fair to McLeodUSA or the relevant Restricted
Subsidiary) and

    (b) McLeodUSA delivers to the trustee (i) with respect to any Affiliate
Transaction involving aggregate payments in excess of $1 million, a certificate
of the chief executive, operating or financial officer of McLeodUSA evidencing
such officer's determination that such Affiliate Transaction or series of
Affiliate Transactions complies with clause (a) above and is in the best
interests of McLeodUSA or such Restricted Subsidiary and (ii) with respect to
any Affiliate Transaction or series of Affiliate Transactions involving
aggregate payments in excess of $5 million, a Board Resolution certifying that
such Affiliate Transaction or series of Affiliate Transactions complies with
clause (a) above and that such Affiliate Transaction or series of Affiliate
Transactions has been approved by a majority of the disinterested members of the
board of directors who have determined that such Affiliate Transaction or series
of Affiliate Transactions is in the best interest of McLeodUSA or such
Restricted Subsidiary;

provided that the following shall not be deemed Affiliate Transactions:

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<PAGE>
    1.  any employment agreement entered into by McLeodUSA or any of its
Restricted Subsidiaries in the ordinary course of business and consistent with
industry practice;

    2.  any agreement or arrangement with respect to the compensation of a
director or officer of McLeodUSA or any Restricted Subsidiary approved by a
majority of the disinterested members of the board of directors and consistent
with industry practice;

    3.  transactions between or among McLeodUSA and its Restricted Subsidiaries;

    4.  transactions permitted by the covenant described under
"--Covenants--Limitation on Restricted Payments;"

    5.  transactions pursuant to any agreement or arrangement existing on the
Issue Date; and

    6.  transactions with respect to wireline or wireless transmission capacity,
the lease or sharing or other use of cable or fiber optic lines, equipment,
rights-of-way or other access rights, between McLeodUSA or any Restricted
Subsidiary and any other Person; provided, in any case, that such transaction is
on terms that are no less favorable, taken as a whole, to McLeodUSA or the
relevant Restricted Subsidiary than those that could have been obtained in a
comparable transaction by McLeodUSA or such Restricted Subsidiary with Persons
who are not Affiliates of McLeodUSA or the relevant Restricted Subsidiary, or,
in the event that there are no comparable transactions involving Persons who are
not Affiliates of McLeodUSA or the relevant Restricted Subsidiary to apply for
comparative purposes, is otherwise on terms that, taken as a whole, McLeodUSA
has determined to be fair to McLeodUSA or the relevant Restricted Subsidiary.

    RESTRICTED AND UNRESTRICTED SUBSIDIARIES

    (a) McLeodUSA may designate a Subsidiary (including a newly formed or newly
acquired Subsidiary) of McLeodUSA or any of its Restricted Subsidiaries as an
Unrestricted Subsidiary if such Subsidiary does not have any obligations which,
if in Default, would result in a cross default on Indebtedness of McLeodUSA or a
Restricted Subsidiary (other than Indebtedness to McLeodUSA or a Wholly-Owned
Restricted Subsidiary), and (i) such Subsidiary has total assets of $1,000 or
less, (ii) such Subsidiary has assets of more than $1,000 and an Investment in
such Subsidiary in an amount equal to the Fair Market Value of such Subsidiary
would then be permitted under the first paragraph of "--Covenants--Limitation on
Restricted Payments" or (iii) such designation is effective immediately upon
such Person becoming a Subsidiary. Unless so designated as an Unrestricted
Subsidiary, any Person that becomes a Subsidiary of McLeodUSA or any of its
Restricted Subsidiaries shall be classified as a Restricted Subsidiary thereof.

    (b) McLeodUSA will not, and will not permit any of its Restricted
Subsidiaries to, take any action or enter into any transaction or series of
transactions that would result in a Person (other than a newly formed Subsidiary
having no outstanding Indebtedness (other than Indebtedness to McLeodUSA or a
Restricted Subsidiary) at the date of determination) becoming a Restricted
Subsidiary (whether through an acquisition, the redesignation of an Unrestricted
Subsidiary or otherwise) unless, after giving effect to such action, transaction
or series of transactions, on a pro forma basis, (i) McLeodUSA could incur at
least $1.00 of additional Indebtedness pursuant to the first paragraph of
"--Covenants--Limitation on Consolidated Indebtedness" and (ii) no Default or
Event of Default would occur.

    (c) Subject to clause (b), an Unrestricted Subsidiary may be redesignated as
a Restricted Subsidiary. The designation of a Subsidiary as an Unrestricted
Subsidiary or the designation of an Unrestricted Subsidiary as a Restricted
Subsidiary in compliance with clause (b) shall be made by the board of directors
pursuant to a Board Resolution delivered to the trustee and shall be effective
as of the date specified in such Board Resolution, which shall not be prior to
the date such Board Resolution is delivered to the trustee.

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    REPORTS

    McLeodUSA will file with the trustee within 15 days after it files them with
the SEC copies of the annual and quarterly reports and the information,
documents, and other reports that McLeodUSA is required to file with the SEC
pursuant to Section 13(a) or 15(d) of the Securities Exchange Act ("SEC
Reports"). In the event McLeodUSA shall cease to be required to file SEC Reports
pursuant to the Securities Exchange Act, McLeodUSA will nevertheless continue to
file such reports with the SEC, unless the SEC will not accept such a filing,
and the trustee. McLeodUSA will furnish copies of the SEC Reports to the holders
of McLeodUSA notes at the time McLeodUSA is required to file the same with the
trustee and will make such information available to investors who request it in
writing.

CONSOLIDATION, MERGER, CONVEYANCE, LEASE OR TRANSFER

    McLeodUSA will not, in any transaction or series of transactions,
consolidate with, or merge with or into, any other Person or permit any other
Person to merge with or into McLeodUSA, other than a merger of a Restricted
Subsidiary into McLeodUSA in which McLeodUSA is the continuing corporation, or
sell, convey, assign, transfer, lease or otherwise dispose of all or
substantially all of the Property and assets of McLeodUSA and the Restricted
Subsidiaries taken as a whole to any other Person, unless:

    (i) either (a) McLeodUSA shall be the continuing corporation or (b) the
corporation, if other than McLeodUSA, formed by such consolidation or into which
McLeodUSA is merged, or the Person which acquires, by sale, assignment,
conveyance, transfer, lease or disposition, all or substantially all of the
Property and assets of McLeodUSA and the Restricted Subsidiaries taken as a
whole (such corporation or Person, the "Surviving Entity"), shall be a
corporation organized and validly existing under the laws of the United States
of America, any political subdivision thereof, any state thereof or the District
of Columbia, and shall expressly assume, by a supplemental indenture, the due
and punctual payment of the principal of (and premium, if any) and interest on
all the McLeodUSA notes and the performance of McLeodUSA's covenants and
obligations under the McLeodUSA indenture;

    (ii) immediately after giving effect to such transaction or series of
transactions on a pro forma basis, including, without limitation, any
Indebtedness incurred or anticipated to be incurred in connection with or in
respect of such transaction or series of transactions, no Event of Default or
Default shall have occurred and be continuing;

    (iii) immediately after giving effect to such transaction or series of
transactions on a pro forma basis, including, without limitation, any
Indebtedness incurred or anticipated to be incurred in connection with or in
respect of such transaction or series of transactions, McLeodUSA (or the
Surviving Entity, if McLeodUSA is not continuing) would (A) be permitted to
Incur at least $1.00 of additional Indebtedness pursuant to the first paragraph
of "--Covenants--Limitation on Consolidated Indebtedness" and (B) have a
Consolidated Net Worth that is not less than the Consolidated Net Worth of
McLeodUSA immediately before such transaction or series of transactions; and

    (iv) if, as a result of any such transaction, Property of McLeodUSA would
become subject to a Lien prohibited by the provisions of the McLeodUSA indenture
described under "--Covenants--Limitation on Liens" above, McLeodUSA or the
successor entity to McLeodUSA shall have secured the McLeodUSA notes as required
thereby.

EVENTS OF DEFAULT

    Each of the following is an "Event of Default" under the McLeodUSA
indenture:

    (a) default in the payment of interest on any McLeodUSA note when the same
becomes due and payable, and the continuance of such default for a period of 30
days;

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    (b) default in the payment of the principal of (or premium, if any, on) any
McLeodUSA note at its maturity, upon optional redemption, required repurchase
(including pursuant to a Change of Control Offer or an Asset Sale Offer) or
otherwise or the failure to make an offer to purchase any McLeodUSA note as
required;

    (c) failure by McLeodUSA to comply with any of its covenants or agreements
described under "--Repurchase at the Option of the Holders upon a Change of
Control," "--Asset Sales" or "--Consolidation, Merger, Conveyance, Lease or
Transfer;"

    (d) default in the performance, or breach, of any covenant or warranty of
McLeodUSA in the McLeodUSA indenture (other than a covenant or warranty
addressed in (a), (b) or (c) above) and continuance of such Default or breach
for a period of 60 days after written notice thereof has been given to McLeodUSA
by the trustee or to McLeodUSA and the trustee by holders of at least 25% of the
aggregate principal amount of the outstanding McLeodUSA notes;

    (e) Indebtedness of McLeodUSA or any Restricted Subsidiary is not paid when
due within the applicable grace period, if any, or is accelerated by the holders
thereof and, in either case, the principal amount of such unpaid or accelerated
Indebtedness exceeds $10 million;

    (f) the entry by a court of competent jurisdiction of one or more final
judgments against McLeodUSA or any Restricted Subsidiary in an uninsured or
unindemnified aggregate amount in excess of $10 million which is not discharged,
waived, appealed, stayed, bonded or satisfied for a period of 45 consecutive
days;

    (g) the entry by a court having jurisdiction in the premises of (i) a decree
or order for relief in respect of McLeodUSA or any Restricted Subsidiary in an
involuntary case or proceeding under U.S. bankruptcy laws, as now or hereafter
constituted, or any other applicable Federal, state, or foreign bankruptcy,
insolvency, or other similar law or (ii) a decree or order adjudging McLeodUSA
or any Restricted Subsidiary bankrupt or insolvent, or approving as properly
filed a petition seeking reorganization, arrangement, adjustment or composition
of or in respect of McLeodUSA or any Restricted Subsidiary under U.S. bankruptcy
laws, as now or hereafter constituted, or any other applicable Federal, state or
foreign bankruptcy, insolvency or similar law, or appointing a custodian,
receiver, liquidator, assignee, trustee, sequestrator or other similar official
of McLeodUSA or any Restricted Subsidiary or of any substantial part of the
Property or assets of McLeodUSA or any Restricted Subsidiary, or ordering the
winding up or liquidation of the affairs of McLeodUSA or any Restricted
Subsidiary, and the continuance of any such decree or order for relief or any
such other decree or order unstayed and in effect for a period of 60 consecutive
days; or

    (h) (i) the commencement by McLeodUSA or any Restricted Subsidiary of a
voluntary case or proceeding under U.S. bankruptcy laws, as now or hereafter
constituted, or any other applicable Federal, state or foreign bankruptcy,
insolvency or other similar law or of any other case or proceeding to be
adjudicated a bankrupt or insolvent; or (ii) the consent by McLeodUSA or any
Restricted Subsidiary to the entry of a decree or order for relief in respect of
McLeodUSA or any Restricted Subsidiary in an involuntary case or proceeding
under U.S. bankruptcy laws, as now or hereafter constituted, or any other
applicable Federal, state or foreign bankruptcy, insolvency or other similar law
or to the commencement of any bankruptcy or insolvency case or proceeding
against McLeodUSA or any Restricted Subsidiary; or (iii) the filing by McLeodUSA
or any Restricted Subsidiary of a petition or answer or consent seeking
reorganization or relief under U.S. bankruptcy laws, as now or hereafter
constituted, or any other applicable Federal, state or foreign bankruptcy,
insolvency or other similar law; or (iv) the consent by McLeodUSA or any
Restricted Subsidiary to the filing of such petition or to the appointment of or
taking possession by a custodian, receiver, liquidator, assignee, trustee,
sequestrator or similar official of McLeodUSA or any Restricted Subsidiary or of
any substantial part of the Property or assets of McLeodUSA or any Restricted
Subsidiary, or the making by McLeodUSA or any Restricted Subsidiary of an
assignment for the benefit of creditors; or (v) the admission by

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McLeodUSA or any Restricted Subsidiary in writing of its inability to pay its
debts generally as they become due; or (vi) the taking of corporate action by
McLeodUSA or any Restricted Subsidiary in furtherance of any such action.

    If any Event of Default (other than an Event of Default specified in clause
(g) or (h) above) occurs and is continuing, then and in every such case the
trustee or the holders of not less than 25% of the outstanding aggregate
principal amount of McLeodUSA notes may declare the Default Amount (as defined
herein) and any accrued and unpaid interest on all McLeodUSA notes then
outstanding to be immediately due and payable by a notice in writing to
McLeodUSA (and to the trustee if given by holders of the McLeodUSA notes), and
upon any such declaration, such Default Amount and any accrued interest will
become and be immediately due and payable. If any Event of Default specified in
clause (g) or (h) above occurs, the Default Amount and any accrued and unpaid
interest on the McLeodUSA notes then outstanding shall become immediately due
and payable without any declaration or other act on the part of the trustee or
any holder of McLeodUSA notes. In the event of a declaration of acceleration
because an Event of Default set forth in clause (e) above has occurred and is
continuing, such declaration of acceleration shall be automatically rescinded
and annulled if the event of default triggering such Event of Default pursuant
to clause (e) shall be remedied, or cured or waived by the holders of the
relevant Indebtedness, within 60 days after such Event of Default, provided that
no judgment or decree for the payment of money due on the McLeodUSA notes has
been obtained by the trustee. The Default Amount shall equal 100% of the
principal amount of the McLeodUSA notes. Under specified circumstances, the
holders of a majority in principal amount of the outstanding McLeodUSA notes by
notice to McLeodUSA and the trustee may rescind an acceleration and its
consequences.

    McLeodUSA will be required to deliver to the trustee annually a statement
regarding compliance with the McLeodUSA indenture, and McLeodUSA is required
within 30 days after becoming aware of any Default or Event of Default, to
deliver to the trustee a statement describing such Default or Event of Default,
its status and what action McLeodUSA is taking or proposes to take with respect
thereto. The trustee may withhold from holders of the McLeodUSA notes notice of
any continuing Default or Event of Default, other than relating to the payment
of principal or interest, if the trustee determines that withholding such notice
is in the holders' interest.

AMENDMENT, SUPPLEMENT AND WAIVER

    McLeodUSA and the trustee may, at any time and from time to time, without
notice to or consent of any holder of McLeodUSA notes, enter into one or more
indentures supplemental to the McLeodUSA indenture:

    (1) to evidence the succession of another Person to McLeodUSA and the
assumption by such successor of the covenants of McLeodUSA in the McLeodUSA
indenture and the McLeodUSA notes;

    (2) to add to the covenants of McLeodUSA, for the benefit of the holders, or
to surrender any right or power conferred upon McLeodUSA by the McLeodUSA
indenture;

    (3) to add any additional Events of Default;

    (4) to provide for uncertificated McLeodUSA notes in addition to or in place
of certificated McLeodUSA notes;

    (5) to evidence and provide for the acceptance of appointment under the
McLeodUSA indenture of a successor trustee;

    (6) to secure the McLeodUSA notes;

    (7) to cure any ambiguity in the McLeodUSA indenture, to correct or
supplement any provision in the McLeodUSA indenture which may be inconsistent
with any other provision therein or to add any

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other provisions with respect to matters or questions arising under the
McLeodUSA indenture; provided such actions shall not adversely affect the
interests of the holders in any material respect; or

    (8) to comply with the requirements of the SEC in order to effect or
maintain the qualification of the McLeodUSA indenture under the Trust Indenture
Act.

    With the consent of the holders of not less than a majority in principal
amount of the outstanding McLeodUSA notes, McLeodUSA and the trustee may enter
into one or more indentures supplemental to the McLeodUSA indenture for the
purpose of adding any provisions to or changing in any manner or eliminating any
of the provisions of the McLeodUSA indenture or modifying in any manner the
rights of the holders; provided that no such supplemental indenture shall,
without the consent of the holder of each outstanding McLeodUSA note:

    (1) change the Stated Maturity of the principal of, or any installment of
interest on, any McLeodUSA note, or alter the redemption provisions thereof, or
reduce the principal amount thereof (or premium, if any), or the interest
thereon that would be due and payable upon Maturity thereof, or change the place
of payment where, or the coin or currency in which, any McLeodUSA note or any
premium or interest thereon is payable, or impair the right to institute suit
for the enforcement of any such payment on or after the maturity thereof;

    (2) reduce the percentage in principal amount of the outstanding McLeodUSA
notes, the consent of whose holders is necessary for any such supplemental
indenture or required for any waiver of compliance with several provisions of
the McLeodUSA indenture or several Defaults thereunder;

    (3) subordinate in right of payment, or otherwise subordinate, the McLeodUSA
notes to any other Indebtedness; or

    (4) modify any provision of this paragraph, except to increase any
percentage set forth herein.

    The holders of not less than a majority in principal amount of the
outstanding McLeodUSA notes may, on behalf of the holders of all the McLeodUSA
notes, waive any past Default under the McLeodUSA indenture and its
consequences, except a Default (1) in the payment of the principal of (or
premium, if any) or interest on any McLeodUSA note, or (2) in respect of a
covenant or provision hereof which under the proviso to the prior paragraph
cannot be modified or amended without the consent of the holder of each
outstanding McLeodUSA note affected.

SATISFACTION AND DISCHARGE OF THE MCLEODUSA INDENTURE; DEFEASANCE

    McLeodUSA may terminate its obligations under the McLeodUSA indenture when:

    (i) either (A) all outstanding McLeodUSA notes have been delivered to the
trustee for cancellation or (B) all such McLeodUSA notes not theretofore
delivered to the trustee for cancellation have become due and payable, will
become due and payable within one year or are to be called for redemption within
one year under irrevocable arrangements satisfactory to the trustee for the
giving of notice of redemption by the trustee in the name and at the expense of
McLeodUSA, and McLeodUSA has irrevocably deposited or caused to be deposited
with the trustee funds in an amount sufficient to pay and discharge the entire
indebtedness on the McLeodUSA notes not theretofore delivered to the trustee for
cancellation, for principal of (or premium, if any, on) and interest to the date
of deposit or maturity or date of redemption;

    (ii) McLeodUSA has paid or caused to be paid all sums payable by McLeodUSA
under the McLeodUSA indenture; and

    (iii) McLeodUSA has delivered to the trustee an Officers' Certificate and an
Opinion of Counsel relating to compliance with the conditions set forth in the
McLeodUSA indenture.

    McLeodUSA, at its election, shall:

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    (a) be deemed to have paid and discharged its debt on the McLeodUSA notes
and the McLeodUSA indenture shall cease to be of further effect as to all
outstanding McLeodUSA notes, except as to (i) rights of registration of
transfer, substitution and exchange of McLeodUSA notes and McLeodUSA's right of
optional redemption, (ii) rights of holders to receive payments of principal of,
premium, if any, and interest on the McLeodUSA notes (but not the Change of
Control Purchase Price or the Offer Purchase Price) and any rights the holders
with respect to such amounts, (iii) the rights, obligations and immunities of
the trustee under the McLeodUSA indenture and (iv) several other specified
provisions in the McLeodUSA indenture, or

    (b) cease to be under any obligation to comply with specified restrictive
covenants, including those described under "--Covenants," after the irrevocable
deposit by McLeodUSA with the trustee, in trust for the benefit of the holders,
at any time prior to the maturity of the McLeodUSA notes, of (A) money in an
amount, (B) U.S. Government Obligations which through the payment of interest
and principal will provide, not later than one day before the due date of
payment in respect of the McLeodUSA notes, money in an amount, or (C) a
combination thereof, sufficient to pay and discharge the principal of, and
interest on, the McLeodUSA notes then outstanding on the dates on which any such
payments are due in accordance with the terms of the McLeodUSA indenture and of
the McLeodUSA notes.

Such defeasance or covenant defeasance shall be deemed to occur only if
specified conditions are satisfied, including, among other things, delivery by
McLeodUSA to the trustee of an opinion of counsel reasonably acceptable to the
trustee to the effect that (i) such deposit, defeasance and discharge will not
be deemed, or result in, a taxable event for federal income tax purposes with
respect to the holders; and (ii) McLeodUSA's deposit will not result in the
Trust or the trustee being subject to regulation under the Investment Company
Act of 1940.

THE TRUSTEE

    United States Trust Company of New York is the trustee under the McLeodUSA
indenture and its current address is 114 West 47th Street, New York, New York
10036.

    The holders of not less than a majority in principal amount of the
outstanding McLeodUSA notes will have the right to direct the time, method and
place of conducting any proceeding for exercising any remedy available to the
trustee, subject to several exceptions. Except during the continuance of an
Event of Default, the trustee will perform only such duties as are specifically
set forth in the McLeodUSA indenture. The McLeodUSA indenture provides that in
case an Event of Default shall occur (which shall not be cured or waived), the
trustee will be required, in the exercise of its rights and powers under the
McLeodUSA indenture, to use the degree of care of a prudent person in the
conduct of such person's own affairs. Subject to such provisions, the trustee
will be under no obligation to exercise any of its rights or powers under the
McLeodUSA indenture at the request of any of the holders of the McLeodUSA notes,
unless such holders shall have offered to the trustee indemnity satisfactory to
it against any loss, liability or expense.

NO PERSONAL LIABILITY OF CONTROLLING PERSONS, DIRECTORS, OFFICERS, EMPLOYEES AND
  STOCKHOLDERS

    No controlling Person, director, officer, employee, incorporator or
stockholder of McLeodUSA, as such, shall have any liability for any covenant,
agreement or other obligations of McLeodUSA under the McLeodUSA notes or the
McLeodUSA indenture or for any claim based on, in respect of, or by reason of,
such obligations or their creation, solely by reason of its past, present or
future status as a controlling Person, director, officer, employee, incorporator
or stockholder of McLeodUSA. By accepting a McLeodUSA note each holder waives
and releases all such liability (but only such liability). The waiver and
release are part of the consideration for issuance of the McLeodUSA notes.

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Nonetheless, such waiver may not be effective to waive liabilities under the
federal securities laws and it has been the view of the SEC that such a waiver
is against public policy.

TRANSFER AND EXCHANGE

    A holder may transfer or exchange McLeodUSA notes in accordance with the
McLeodUSA indenture. McLeodUSA, the Registrar and the trustee may require a
holder, among other things, to furnish appropriate endorsements and transfer
documents and McLeodUSA may require a holder to pay any taxes and fees required
by law or permitted by the McLeodUSA indenture.

DEFINITIONS

    Set forth below is a summary of several of the defined terms used in the
McLeodUSA indenture. Reference is made to the McLeodUSA indenture for the full
definition of all such terms, as well as any capitalized terms used herein for
which no definition is provided.

    "Acquired Indebtedness" means, with respect to any specified Person,
Indebtedness of any other Person existing at the time such other Person merged
with or into or became a Subsidiary of such specified Person; provided that such
Indebtedness was not incurred in connection with, or in anticipation or
contemplation of, such other Person merging with or into or becoming a
Subsidiary of such specified Person, but excluding Indebtedness which is
extinguished, retired or repaid in connection with such other Person merging
with or into or becoming a Subsidiary of such specified Person.

    "Affiliate" means, as to any Person, any other Person which directly or
indirectly controls, or is under common control with, or is controlled by, such
Person; provided that each Unrestricted Subsidiary shall be deemed to be an
Affiliate of McLeodUSA and of each other Subsidiary of McLeodUSA; provided,
further, that neither McLeodUSA nor any of its Restricted Subsidiaries shall be
deemed to be Affiliates of each other. For purposes of this definition,
"control" (including, with correlative meanings, the terms "controlling," "under
common control with" and "controlled by"), as used with respect to any Person,
shall mean the possession, directly or indirectly, of the power to direct or
cause the direction of the management or policies of such Person, whether
through the ownership of Voting Stock, by agreement or otherwise.

    "Asset Sale" by any Person means any transfer, conveyance, sale, lease or
other disposition by such Person or any of its Restricted Subsidiaries
(including a consolidation or merger or other sale of any such Restricted
Subsidiary with, into or to another Person in a transaction in which such
Restricted Subsidiary ceases to be a Restricted Subsidiary of the specified
Person, but excluding a disposition by a Restricted Subsidiary of such Person to
such Person or a Wholly-Owned Restricted Subsidiary of such Person or by such
Person to a Wholly-Owned Restricted Subsidiary of such Person) of (i) shares of
Capital Stock or other ownership interests of a Restricted Subsidiary of such
Person (other than as permitted by the provisions of the McLeodUSA indenture
described above under "--Covenants--Limitation on Indebtedness and Preferred
Stock of Restricted Subsidiaries"), (ii) substantially all of the assets of such
Person or any of its Restricted Subsidiaries representing a division or line of
business (other than as part of a Permitted Investment) or (iii) other assets or
rights of such Person or any of its Restricted Subsidiaries outside of the
ordinary course of business and, in each case, that is not governed by the
provisions of the McLeodUSA indenture applicable to consolidations, mergers, and
transfers of all or substantially all of the assets of the McLeodUSA; provided
that "Asset Sale" shall not include (i) sales or other dispositions of
inventory, receivables and other current assets in the ordinary course of
business, (ii) simultaneous exchanges by McLeodUSA or any Restricted Subsidiary
of Telecommunications Assets for other Telecommunications Assets in the ordinary
course of business; provided that the applicable Telecommunications Assets
received by McLeodUSA or such Restricted Subsidiary have at least substantially
equal Fair Market Value to McLeodUSA or such Restricted Subsidiary (as
determined by the board of directors whose good faith determination shall be
conclusive

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and evidenced by a Board Resolution), and (iii) sales or other dispositions of
assets with a Fair Market Value (as certified in an Officers' Certificate) not
in excess of $1 million.

    "Attributable Indebtedness" means, with respect to any Sale and Leaseback
Transaction of any Person, as at the time of determination, the greater of
(i) the capitalized amount in respect of such transaction that would appear on
the balance sheet of such Person in accordance with GAAP and (ii) the present
value (discounted at a rate consistent with accounting guidelines, as determined
in good faith by the responsible accounting officer of such Person) of the
payments during the remaining term of the lease (including any period for which
such lease has been extended or may, at the option of the lessor, be extended)
or until the earliest date on which the lessee may terminate such lease without
penalty or upon payment of a penalty (in which case the rental payments shall
include such penalty).

    "Average Life" means, as of any date, with respect to any debt security or
Disqualified Stock, the quotient obtained by dividing (i) the sum of the
products of (x) the number of years from such date to the dates of each
scheduled principal payment or redemption payment (including any sinking fund or
mandatory redemption payment requirements) of such debt security or Disqualified
Stock multiplied in each case by (y) the amount of such principal or redemption
payment, by (ii) the sum of all such principal or redemption payments.

    "board of directors" means the board of directors of McLeodUSA or any
committee thereof duly authorized to act on behalf of the board of directors,
unless the context suggests otherwise.

    "Board Resolution" means a duly adopted resolution of the board of directors
in full force and effect at the time of determination.

    "Capital Lease Obligation" of any Person means the obligation to pay rent or
other payment amounts under a lease of (or other Indebtedness arrangement
conveying the right to use) real or personal property of such Person which is
required to be classified and accounted for as a capital lease or a liability on
the face of a balance sheet of such Person prepared in accordance with GAAP, and
the stated maturity thereof shall be the date of the last payment of rent or any
amount due under such lease prior to the first date upon which such lease may be
terminated by the lessee without payment of a penalty.

    "Capital Stock" in any Person means any and all shares, interests,
participations or other equivalents in the equity interest (however designated)
in such Person and any rights (other than Indebtedness convertible into an
equity interest), warrants or options to subscribe for or acquire an equity
interest in such Person.

    "Change of Control" shall be deemed to occur if (i) the sale, conveyance,
transfer or lease of all or substantially all of the assets of McLeodUSA to any
"Person" or "group" (within the meaning of Sections 13(d)(3) and 14(d)(2) of the
Securities Exchange Act or any successor provision to either of the foregoing,
including any group acting for the purpose of acquiring, holding or disposing of
securities within the meaning of Rule 13d-5(b)(i) under the Securities Exchange
Act), other than any Permitted Holder (as defined below) or any Restricted
Subsidiary of McLeodUSA, shall have occurred; (ii) any "Person" or "group"
(within the meaning of Sections 13(d)(3) and 14(d)(2) of the Securities Exchange
Act or any successor provision to either of the foregoing, including any group
acting for the purpose of acquiring, holding or disposing of securities within
the meaning of Rule 13d-5(b)(i) under the Securities Exchange Act), other than
any Permitted Holder, becomes the "beneficial owner" (as defined in Rule 13d-3
under the Securities Exchange Act) of more than 35% of the total voting power of
all classes of the Voting Stock of McLeodUSA (including any warrants, options or
rights to acquire such Voting Stock), calculated on a fully diluted basis, and
such voting power percentage is greater than or equal to the total voting power
percentage then beneficially owned by the Permitted Holders in the aggregate; or
(iii) during any period of two consecutive years, individuals who at the
beginning of such period constituted the board of directors (together with any
directors whose election or appointment by

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the board of directors or whose nomination for election by the stockholders of
McLeodUSA was approved by a vote of a majority of the directors then still in
office who were either directors at the beginning of such period or whose
election or nomination for election was previously so approved) cease for any
reason to constitute a majority of the board of directors then in office.

    "Common Stock" means Capital Stock other than Preferred Stock.

    "Consolidated Capital Ratio" of any Person as of any date means the ratio of
(i) the aggregate consolidated principal amount of Indebtedness of such Person
then outstanding to (ii) the aggregate consolidated paid-in capital of such
Person as of such date.

    "Consolidated Cash Flow Available for Fixed Charges" for any period means
the Consolidated Net Income of McLeodUSA and its Restricted Subsidiaries for
such period increased by the sum of (i) Consolidated Interest Expense of
McLeodUSA and its Restricted Subsidiaries for such period, plus (ii)
Consolidated Income Tax Expense of McLeodUSA and its Restricted Subsidiaries for
such period, plus (iii) the consolidated depreciation and amortization expense
included in the income statement of McLeodUSA and its Restricted Subsidiaries
for such period, plus (iv) any non-cash expense related to the issuance to
employees of McLeodUSA or any Restricted Subsidiary of McLeodUSA of options to
purchase Capital Stock of McLeodUSA or such Restricted Subsidiary, plus (v) any
charge related to any premium or penalty paid in connection with redeeming or
retiring any Indebtedness prior to its stated maturity; and plus (vi) any
non-cash expense related to a purchase accounting adjustment not requiring an
accrual or reserve and separately disclosed in McLeodUSA's Consolidated Income
Statement, and decreased by the amount of any non-cash item that increases such
Consolidated Net Income, all as determined on a consolidated basis in accordance
with GAAP; provided that there shall be excluded therefrom the Consolidated Cash
Flow Available for Fixed Charges (if positive) of any Restricted Subsidiary of
McLeodUSA (calculated separately for such Restricted Subsidiary in the same
manner as provided above for McLeodUSA) that is subject to a restriction which
prevents the payment of dividends or the making of distributions to McLeodUSA or
another Restricted Subsidiary of McLeodUSA to the extent of such restriction.

    "Consolidated Income Tax Expense" for any period means the aggregate amounts
of the provisions for income taxes of McLeodUSA and its Restricted Subsidiaries
for such period calculated on a consolidated basis in accordance with GAAP.

    "Consolidated Interest Expense" means for any period the interest expense
included in a consolidated income statement (excluding interest income) of
McLeodUSA and its Restricted Subsidiaries for such period in accordance with
GAAP, including without limitation or duplication (or, to the extent not so
included, with the addition of), (i) the amortization of Indebtedness discount;
(ii) any payments or fees with respect to letters of credit, bankers'
acceptances or similar facilities; (iii) fees with respect to interest rate swap
or similar agreements or foreign currency hedge, exchange or similar agreements;
(iv) Preferred Stock dividends of McLeodUSA and its Restricted Subsidiaries
(other than dividends paid in shares of Preferred Stock that is not Disqualified
Stock) declared and paid or payable; (v) accrued Disqualified Stock dividends of
McLeodUSA and its Restricted Subsidiaries, whether or not declared or paid; (vi)
interest on Indebtedness guaranteed by McLeodUSA and its Restricted
Subsidiaries; and (vii) the portion of any Capital Lease Obligation paid during
such period that is allocable to interest expense in accordance with GAAP.

    "Consolidated Net Income" of any Person means, for any period, the aggregate
net income (or net loss) of such Person and its Restricted Subsidiaries for such
period on a consolidated basis determined in accordance with GAAP; provided that
there shall be excluded therefrom, without duplication (i) all items classified
as extraordinary, (ii) any net income (or net loss) of any Person other than
such Person and its Restricted Subsidiaries, except to the extent of the amount
of dividends or other distributions actually paid to such Person or its
Restricted Subsidiaries by such other Person during such period, (iii) the net
income of any Person acquired by such Person or any of its Restricted
Subsidiaries in a

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pooling-of-interests transaction for any period prior to the date of the related
acquisition, (iv) any gain or loss, net of taxes, realized on the termination of
any employee pension benefit plan, (v) net gains (or net losses) in respect of
Asset Sales by such Person or its Restricted Subsidiaries, (vi) the net income
(or net loss) of any Restricted Subsidiary of such Person to the extent that the
payment of dividends or other distributions to such Person is restricted by the
terms of its charter or any agreement, instrument, contract, judgment, order,
decree, statute, rule, governmental regulation or otherwise, except for any
dividends or distributions actually paid by such Restricted Subsidiary to such
Person, (vii) with regard to a non-wholly-owned Restricted Subsidiary, any
aggregate net income (or loss) in excess of such Person's or such Restricted
Subsidiary's pro rata share of such non-wholly-owned Restricted Subsidiary's net
income (or loss) and (viii) the cumulative effect of changes in accounting
principles.

    "Consolidated Net Worth" of any Person means, at any date of determination,
the consolidated stockholders' equity or partners' capital (excluding
Disqualified Stock) of such Person and its subsidiaries, as determined in
accordance with GAAP.

    "Consolidated Tangible Assets" of any Person means the total amount of
assets (less applicable reserves and other properly deductible items) which
under GAAP would be included on a consolidated balance sheet of such Person and
its Subsidiaries after deducting therefrom all goodwill, trade names,
trademarks, patents, unamortized debt discount and expense and other like
intangibles, which in each case under GAAP would be included on such
consolidated balance sheet.

    "Default" means any event, act or condition, the occurrence of which is, or
after notice or the passage of time or both would be, an Event of Default.

    "Depository" means, with respect to the McLeodUSA notes issuable or issued
in whole or in part in the form of one or more Global Notes, The Depository
Trust Company for so long as it shall be a clearing agency registered under the
Securities Exchange Act, or such successor as McLeodUSA shall designate from
time to time in an Officers' Certificate delivered to the trustee.

    "Disqualified Stock" means any Capital Stock which, by its terms (or by the
terms of any security into which it is convertible or for which it is
exchangeable), or upon the happening of any event, or otherwise, matures or is
mandatorily redeemable, pursuant to a sinking fund obligation or otherwise, or
is redeemable at the option of the holder thereof, or is exchangeable for
Indebtedness at any time, in whole or in part, prior to the Stated Maturity of
the McLeodUSA notes.

    "Eligible Cash Equivalents" means (i) securities issued or directly and
fully guaranteed or insured by the United States of America or any agency or
instrumentality thereof, provided that the full faith and credit of the United
States of America is pledged in support thereof; (ii) time deposits and
certificates of deposit of any commercial bank organized in the United States
having capital and surplus in excess of $500 million with a maturity date not
more than one year from the date of acquisition, (iii) repurchase obligations
with a term of not more than seven days for underlying securities of the types
described in clause (i) above entered into with any bank meeting the
qualifications specified in clause (ii) above; (iv) direct obligations issued by
any state of the United States of America or any political subdivision of any
such state or any public instrumentality thereof maturing, or subject to tender
at the option of the holder thereof within 270 calendar days after the date of
acquisition thereof and, at the time of acquisition, having a rating of A or
better from Standard & Poor's Corporation or A-2 or better from Moody's
Investors Service, Inc., (v) commercial paper issued by the parent corporation
of any commercial bank organized in the United States having capital and surplus
in excess of $500 million and commercial paper issued by others having one of
the two highest ratings obtainable from either Standard & Poor's Corporation or
Moody's Investors Service, Inc. and in each case maturing within 270 calendar
days after the date of acquisition, (vi) overnight bank deposits and bankers'
acceptances at any commercial bank organized in the United States having capital
and surplus in excess of $500 million; (vii) deposits available for withdrawal
on demand with a commercial bank organized in the United States having capital
and surplus in excess of $500 million; and

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<PAGE>
(viii) investments in money market funds substantially all of whose assets
comprise securities of the types described in clauses (i) through (vi).

    "Existing Indebtedness" means Indebtedness outstanding on the date of the
McLeodUSA indenture (other than under any Senior Credit Facility).

    "Fair Market Value" means, with respect to any asset or Property, the sale
value that would be obtained in an arm's-length transaction between an informed
and willing seller under no compulsion to sell and an informed and willing buyer
under no compulsion to buy, as determined in good faith by the board of
directors.

    "GAAP" means United States generally accepted accounting principles,
consistently applied, as set forth in the opinions and pronouncements of the
Accounting Principles Board of the American Institute of Certified Public
Accountants and statements and pronouncements of the Financial Accounting
Standards Board, or in such other statements by such other entity as may be
approved by a significant segment of the accounting profession of the United
States, that are applicable to the circumstances as of the date of
determination; provided that, except as otherwise specifically provided, all
calculations made for purposes of determining compliance with the terms of the
provisions of the McLeodUSA indenture shall utilize GAAP as in effect on the
Issue Date.

    "Guarantee" means any direct or indirect obligation, contingent or
otherwise, of a Person guaranteeing or having the economic effect of
guaranteeing any Indebtedness of any other Person in any manner (and
"Guaranteed," "Guaranteeing" and "Guarantor" shall have meanings correlative to
the foregoing).

    "holder" means (i) in the case of any certificated McLeodUSA note, the
Person in whose name such certificated McLeodUSA note is registered in the Note
Register and (ii) in the case of any Global McLeodUSA note, the Depositary.

    "Incur" means, with respect to any Indebtedness or other obligation of any
Person, to create, issue, incur (by conversion, exchange or otherwise), assume,
Guarantee or otherwise become liable in respect of such Indebtedness or other
obligation including by acquisition of Subsidiaries or the recording, as
required pursuant to GAAP or otherwise, of any such Indebtedness or other
obligation on the balance sheet of such Person (and "Incurrence," "Incurred,"
"Incurrable" and "Incurring" shall have meanings correlative to the foregoing);
provided that a change in GAAP that results in an obligation of such Person that
exists at such time becoming Indebtedness shall not be deemed an Incurrence of
such Indebtedness and that neither the accrual of interest nor the accretion of
original issue discount shall be deemed an Incurrence of Indebtedness.
Indebtedness otherwise incurred by a Person before it becomes a Subsidiary of
McLeodUSA (whether by merger, consolidation, acquisition or otherwise) shall be
deemed to have been incurred at the time at which such Person becomes a
Subsidiary of McLeodUSA.

    "Indebtedness" means, at any time (without duplication), with respect to any
Person, whether recourse as to all or a portion of the assets of such Person,
and whether or not contingent, (i) any obligation of such Person for money
borrowed, (ii) any obligation of such Person evidenced by bonds, debentures,
notes, Guarantees or other similar instruments, including, without limitation,
any such obligations incurred in connection with the acquisition of Property,
assets or businesses, excluding trade accounts payable made in the ordinary
course of business, (iii) any reimbursement obligation of such Person with
respect to letters of credit, bankers' acceptances or similar facilities issued
for the account of such Person, (iv) any obligation of such Person issued or
assumed as the deferred purchase price of Property or services (but excluding
trade accounts payable or accrued liabilities arising in the ordinary course of
business, which in either case are not more than 60 days overdue or which are
being contested in good faith), (v) any Capital Lease Obligation of such Person,
(vi) the maximum fixed redemption or repurchase price of Disqualified Stock of
such Person and, to the extent held by Persons

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other than such Person or its Restricted Subsidiaries, the maximum fixed
redemption or repurchase price of Disqualified Stock of such Person's Restricted
Subsidiaries, at the time of determination, (vii) every obligation under
Interest Rate and Currency Protection Agreements of such Person, (viii) any
Attributable Indebtedness with respect to any Sale and Leaseback Transaction to
which such Person is a party and (ix) any obligation of the type referred to in
clauses (i) through (viii) of this definition of another Person and all
dividends and distributions of another Person the payment of which, in either
case, such Person has Guaranteed or is responsible or liable, directly or
indirectly, as obligor, Guarantor or otherwise. For purposes of the preceding
sentence, the maximum fixed repurchase price of any Disqualified Stock that does
not have a fixed repurchase price shall be calculated in accordance with the
terms of such Disqualified Stock as if such Disqualified Stock were repurchased
on any date on which Indebtedness shall be required to be determined pursuant to
the McLeodUSA indenture; provided that, if such Disqualified Stock is not then
permitted to be repurchased, the repurchase price shall be the book value of
such Disqualified Stock. The amount of Indebtedness of any Person at any date
shall be the outstanding balance at such date of all unconditional obligations
as described above and, with respect to contingent obligations, the maximum
liability upon the occurrence of the contingency giving rise to the obligation;
provided that the amount outstanding at any time of any Indebtedness issued with
original issue discount (including, without limitation, our 10 1/2% senior
discount notes) is the face amount of such Indebtedness less the remaining
unamortized portion of the original issue discount of such Indebtedness at such
time as determined in conformity with GAAP.

    "Interest Rate or Currency Protection Agreement" of any Person means any
forward contract, futures contract, swap, option, future option or other
financial agreement or arrangement (including, without limitation, caps, floors,
collars and similar agreements) relating to, or the value of which is dependent
upon, interest rates or currency exchange rates or indices.

    "Investment" in any Person means any direct, indirect or contingent (i)
advance or loan to, Guarantee of any Indebtedness of, extension of credit or
capital contribution to such Person, (ii) the acquisition of any shares of
Capital Stock, bonds, notes, debentures or other securities of such Person, or
(iii) the acquisition, by purchase or otherwise, of all or substantially all of
the business, assets or stock or other evidence of beneficial ownership of such
Person; provided that Investments shall exclude commercially reasonable
extensions of trade credit. The amount of any Investment shall be the original
cost of such Investment, plus the cost of all additions thereto and minus the
amount of any portion of such Investment repaid to such Person in cash as a
repayment of principal or a return of capital, as the case may be, but without
any other adjustments for increases or decreases in value, or write-ups, write-
downs or write-offs with respect to such Investment. In determining the amount
of any Investment involving a transfer of any Property other than cash, such
Property shall be valued at its Fair Market Value at the time of such transfer.

    "Issue Date" means the date on which the McLeodUSA notes were first
authenticated and delivered under the McLeodUSA indenture.

    "Lien" means, with respect to any Property or other asset, any mortgage or
deed of trust, pledge, hypothecation, assignment, deposit arrangement, security
interest, lien (statutory or other), charge, easement, encumbrance, preference,
priority or other security or similar agreement or preferential arrangement of
any kind or nature whatsoever on or with respect to such Property or other asset
(including, without limitation, any conditional sale or title retention
agreement having substantially the same economic effect as any of the
foregoing).

    "Maturity" means, when used with respect to a McLeodUSA note, the date on
which the principal of such McLeodUSA note becomes due and payable as provided
therein or in the McLeodUSA indenture, whether on the date specified in such
McLeodUSA note as the fixed date on which the

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principal of such McLeodUSA note is due and payable, a Change of Control Payment
Date or an Asset Sale Payment Date, or by declaration of acceleration, call for
redemption or otherwise.

    "Net Cash Proceeds" means, with respect to the sale of any Property or
assets by any Person or any of its Restricted Subsidiaries, cash or readily
marketable cash equivalents received net of (i) all reasonable out-of-pocket
expenses of such Person or such Restricted Subsidiary incurred in connection
with such sale, including, without limitation, all legal, title and recording
tax expenses, commissions and other fees and expenses incurred (but excluding
any finder's fee or broker's fee payable to any Affiliate of such Person) and
all federal, state, foreign and local taxes arising in connection with such sale
that are paid or required to be accrued as a liability under GAAP by such Person
or its Restricted Subsidiaries, (ii) all payments made or required to be made by
such Person or its Restricted Subsidiaries on any Indebtedness which is secured
by such Properties or other assets in accordance with the terms of any Lien upon
or with respect to such Properties or other assets or which must, by the terms
of such Lien, or in order to obtain a necessary consent to such transaction or
by applicable law, be repaid in connection with such sale, (iii) all
contractually required distributions and other payments made to minority
interest holders (but excluding distributions and payments to Affiliates of such
Person) in Restricted Subsidiaries of such Person as a result of such
transaction and (iv) appropriate amounts to be provided by such Person or any
Restricted Subsidiary thereof, as the case may be, as a reserve in accordance
with GAAP against any liabilities associated with such assets and retained by
such Person or any Restricted Subsidiary thereof, as the case may be, after such
transaction, including, without limitation, liabilities under any
indemnification obligations and severance and other employee termination costs
associated with such transaction, in each case as determined by the board of
directors of such Person, in its reasonable good faith judgment evidenced by a
resolution of the board of directors filed with the trustee; provided that, in
the event that any consideration for a transaction (which would otherwise
constitute Net Cash Proceeds) is required to be held in escrow pending
determination of whether a purchase price adjustment will be made, such
consideration (or any portion thereof) shall become Net Cash Proceeds only at
such time as it is released to such Person or its Restricted Subsidiaries from
escrow; and provided, further, that any non-cash consideration received in
connection with any transaction, which is subsequently converted to cash, shall
be deemed to be Net Cash Proceeds at such time, and shall thereafter be applied
in accordance with the McLeodUSA indenture.

    "Officers' Certificate" means a certificate signed by (i) the Chairman of
the Board, a Vice Chairman of the Board, the President, the Chief Executive
Officer or a Vice President, and (ii) the Chief Financial Officer, the Chief
Accounting Officer, the Treasurer, an Assistant Treasurer, the Secretary or an
Assistant Secretary of McLeodUSA and delivered to the trustee, which shall
comply with the McLeodUSA indenture.

    "Paying Agent" means any Person authorized by McLeodUSA to make payments of
principal, premium or interest with respect to the McLeodUSA notes on behalf of
McLeodUSA.

    "Permitted Holders" means Alliant Energy Corp., Media/Communications
Partners III Limited Partnership and Forstmann Little & Co. and their respective
successors and assigns, and Clark E. and Mary E. McLeod, Richard A. Lumpkin and
Kwok Li and foundations and trusts controlled by them or any of them, and
Affiliates (other than McLeodUSA and the Restricted Subsidiaries) of each of the
foregoing.

    "Permitted Interest Rate or Currency Protection Agreement" of any Person
means any Interest Rate or Currency Protection Agreement entered into with one
or more financial institutions in the ordinary course of business that is
designed to protect such Person against fluctuations in interest rates or
currency exchange rates with respect to Indebtedness Incurred and which shall
have a notional amount no greater than the payments due with respect to the
Indebtedness being hedged thereby and not for purposes of speculation.

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    "Permitted Investments" means (i) Eligible Cash Equivalents; (ii)
Investments in Property used in the ordinary course of business; (iii)
Investments in any Person as a result of which such Person becomes a Restricted
Subsidiary in compliance with the McLeodUSA indenture; (iv) Investments pursuant
to agreements or obligations of McLeodUSA or a Restricted Subsidiary, in effect
on the Issue Date, to make such Investments; (v) Investments in prepaid
expenses, negotiable instruments held for collection and lease, utility and
workers' compensation, performance and other similar deposits; (vi) Permitted
Interest Rate or Currency Protection Agreements with respect to any floating
rate Indebtedness that is permitted by the terms of the McLeodUSA indenture to
be outstanding; (vii) bonds, notes, debentures or other debt securities received
as a result of Asset Sales permitted under the covenant described under "--Asset
Sales;" (viii) Investments in existence at the Issue Date; (ix) commission,
payroll, travel and similar advances to employees in the ordinary course of
business to cover matters that are expected at the time of such advances
ultimately to be treated as expenses in accordance with GAAP; (x) stock,
obligations or securities received in satisfaction of judgments; and (xi)
Investments made pursuant to any deferred-compensation plan, including
Investments made through a trust (including a grantor trust) established in
connection with any such plan, for the benefit of employees of McLeodUSA or of
any Restricted Subsidiary.

    "Permitted Liens" means (i) Liens for taxes, assessments, governmental
charges or claims which are not yet delinquent or which are being contested in
good faith by appropriate proceedings, if a reserve or other appropriate
provision, if any, as shall be required in conformity with GAAP shall have been
made therefor; (ii) other Liens incidental to the conduct of McLeodUSA's and its
Restricted Subsidiaries' business or the ownership of its property and assets
not securing any Indebtedness, and which do not in the aggregate materially
detract from the value of McLeodUSA's and its Restricted Subsidiaries' property
or assets when taken as a whole, or materially impair the use thereof in the
operation of its business; (iii) Liens with respect to assets of a Restricted
Subsidiary granted by such Restricted Subsidiary to McLeodUSA to secure
Indebtedness owing to McLeodUSA; (iv) pledges and deposits made in the ordinary
course of business in connection with workers' compensation and unemployment
insurance, statutory Liens of landlords, carriers, warehousemen, mechanics,
materialmen, repairmen and other types of statutory obligations; (v) deposits
made to secure the performance of tenders, bids, leases, and other obligations
of like nature incurred in the ordinary course of business (exclusive of
obligations for the payment of borrowed money); (vi) zoning restrictions,
servitudes, easements, rights-of-way, restrictions and other similar charges or
encumbrances incurred in the ordinary course of business which, in the
aggregate, do not materially detract from the value of the property subject
thereto or interfere with the ordinary conduct of the business of McLeodUSA or
its Restricted Subsidiaries; (vii) Liens arising out of judgments or awards
against McLeodUSA or any Restricted Subsidiary with respect to which McLeodUSA
or such Restricted Subsidiary is prosecuting an appeal or proceeding for review
and McLeodUSA or such Restricted Subsidiary is maintaining adequate reserves in
accordance with GAAP; (viii) any interest or title of a lessor in the property
subject to any lease other than a Capital Lease; (ix) Liens (including
extensions and renewals thereof) upon real or personal property acquired after
the Issue Date; provided that (a) such Lien is created solely for the purpose of
securing Indebtedness Incurred, in accordance with "--Covenants--Limitation on
Consolidated Indebtedness," (1) to finance the cost (including the cost of
improvement or construction) of the item of property or assets subject thereto
and such Lien is created prior to, at the time of or within six months after the
later of the acquisition, the completion of construction or the commencement of
full operation of such property or (2) to refinance any Indebtedness previously
so secured, (b) the principal amount of the Indebtedness secured by such Lien
does not exceed 100% of such cost and (c) any such Lien shall not extend to or
cover any property or assets other than such item of property or assets and any
improvements on such item; (x) leases or subleases granted to others that do not
materially interfere with the ordinary course of business of McLeodUSA and its
Restricted Subsidiaries; (xi) Liens encumbering property or assets under
construction arising from progress or partial payments by a customer of
McLeodUSA or its Restricted Subsidiaries relating to such property or assets;
(xii) Liens arising from filing precautionary Uniform

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Commercial Code financing statements regarding leases; (xiii) Liens on property
of, or on shares of stock or Indebtedness of, any corporation existing at the
time such corporation becomes, or becomes a part of, any Restricted Subsidiary;
provided that such Liens do not extend to or cover any property or assets of
McLeodUSA or any Restricted Subsidiary other than the property or assets
acquired; (xiv) Liens in favor of McLeodUSA or any Restricted Subsidiary;
(xv) Liens securing reimbursement obligations with respect to letters of credit
that encumber documents and other property relating to such letters of credit
and the products and proceeds thereof; (xvi) Liens in favor of customs and
revenue authorities arising as a matter of law to secure payment of customs
duties in connection with the importation of goods; (xvii) Liens encumbering
customary initial deposits and margin deposits, and other Liens that are either
within the general parameters customary in the industry and incurred in the
ordinary course of business, in each case, securing Indebtedness under Permitted
Interest Rate Agreements and Currency Agreements; and (xviii) Liens arising out
of conditional sale, title retention, consignment or similar arrangements for
the sale of goods entered into by McLeodUSA or any of its Restricted
Subsidiaries in the ordinary course of business in accordance with the past
practices of McLeodUSA and its Restricted Subsidiaries prior to the Issue Date.

    "Person" means any individual, corporation, limited liability company,
partnership, limited liability partnership, joint venture, trust, unincorporated
organization or government or any agency or political subdivision thereof.

    "Preferred Stock" of any Person means Capital Stock of such Person of any
class or classes (however designated) that ranks prior, as to the payment of
dividends or as to the distribution of assets upon any voluntary or involuntary
liquidation, dissolution or winding up of such Person, to shares of Capital
Stock of any other class of such Person.

    "Property" means, with respect to any Person, any interest of such Person in
any kind of property or asset, whether real, personal or mixed, or tangible or
intangible, excluding Capital Stock in any other Person.

    "Purchase Money Indebtedness" means Indebtedness of McLeodUSA (including
Acquired Indebtedness and Capital Lease Obligations, mortgage financings and
purchase money obligations) incurred for the purpose of financing all or any
part of the cost of construction, acquisition, development or improvement by
McLeodUSA or any Restricted Subsidiary of any Telecommunications Assets of
McLeodUSA or any Restricted Subsidiary and including any related notes,
Guarantees, collateral documents, instruments and agreements executed in
connection therewith, as the same may be amended, supplemented, modified or
restated from time to time.

    "Qualified Receivable Facility" means Indebtedness of McLeodUSA or any
Subsidiary Incurred from time to time pursuant to either (x) credit facilities
secured by Receivables or (y) receivable purchase facilities, and including any
related notes, Guarantees, collateral documents, instruments and agreements
executed in connection therewith, as the same may be amended, supplemented,
modified or restated from time to time.

    "Qualified Receivable Subsidiary" means a Restricted Subsidiary formed
solely for the purpose of obtaining a Qualified Receivable Facility and
substantially all of the Property of which is Receivables.

    "Qualified Stock" of any Person means a class of Capital Stock other than
Disqualified Stock.

    "Receivables" means receivables, chattel paper, instruments, documents or
intangibles evidencing or relating to the right to payment of money and proceeds
and products thereof in each case generated in the ordinary course of business.

    "Restricted Payment" means (i) a dividend or other distribution declared or
paid on the Capital Stock of McLeodUSA or to McLeodUSA's stockholders (in their
capacity as such), or declared or paid to any Person other than McLeodUSA or a
Restricted Subsidiary of McLeodUSA on the Capital Stock of any Restricted
Subsidiary of McLeodUSA, in each case, other than dividends, distributions or

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payments made solely in Qualified Stock of McLeodUSA or such Restricted
Subsidiary, (ii) a payment made by McLeodUSA or any of its Restricted
Subsidiaries (other than to McLeodUSA or any Restricted Subsidiary) to purchase,
redeem, acquire or retire any Capital Stock of McLeodUSA or of a Restricted
Subsidiary, (iii) a payment made by McLeodUSA or any of its Restricted
Subsidiaries (other than a payment made solely in Qualified Stock of McLeodUSA)
to redeem, repurchase, defease (including an in-substance or legal defeasance)
or otherwise acquire or retire for value (including pursuant to mandatory
repurchase covenants), prior to any scheduled maturity, scheduled sinking fund
or mandatory redemption payment, Indebtedness of McLeodUSA or such Restricted
Subsidiary which is subordinate (whether pursuant to its terms or by operation
of law) in right of payment to the McLeodUSA notes and which was scheduled to
mature on or after the maturity of the McLeodUSA notes or (iv) an Investment in
any Person, including an Unrestricted Subsidiary or the designation of a
Subsidiary as an Unrestricted Subsidiary, other than (a) a Permitted Investment,
(b) an Investment by McLeodUSA in a Wholly-Owned Restricted Subsidiary or
(c) an Investment by a Restricted Subsidiary in McLeodUSA or a Wholly-Owned
Restricted Subsidiary of McLeodUSA.

    "Restricted Subsidiary" means any Subsidiary of McLeodUSA that has not been
designated as an "Unrestricted Subsidiary" pursuant to the terms of the
McLeodUSA indenture.

    "Sale and Leaseback Transaction" means, with respect to any Person, any
direct or indirect arrangement pursuant to which Property is sold or transferred
by such Person or a Restricted Subsidiary of such Person and is thereafter
leased back from the purchaser or transferee thereof by such Person or one of
its Restricted Subsidiaries.

    "Senior Credit Facility" means Indebtedness of McLeodUSA and its
Subsidiaries Incurred from time to time pursuant to one or more credit
agreements or similar facilities made available from time to time to McLeodUSA
and its Subsidiaries, whether or not secured, and including any related notes,
Guarantees, collateral documents, instruments and agreements executed in
connection therewith, as the same may be amended, supplemented, modified or
restated from time to time.

    "Stated Maturity" means, with respect to any security, the date specified in
such security as the fixed date on which the payment of principal of such
security is due and payable, including pursuant to any mandatory redemption
provision (but excluding any provision providing for the repurchase of such
security at the option of the holder thereof upon the happening of any
contingency unless such contingency has occurred), and, when used with respect
to any installment of interest on such security, the fixed date on which such
installment of interest is due and payable.

    "Subordinated Indebtedness" means Indebtedness of McLeodUSA as to which the
payment of principal of (and premium, if any) and interest and other payment
obligations in respect of such Indebtedness shall be subordinate to the prior
payment in full of the McLeodUSA notes to at least the following extent: (i) no
payments of principal of (or premium, if any) or interest on or otherwise due in
respect of such Indebtedness may be permitted for so long as any default in the
payment of principal (or premium, if any) or interest on the McLeodUSA notes
exists; (ii) in the event that any other default that with the passing of time
or the giving of notice, or both, would constitute an event of default exists
with respect to the McLeodUSA notes, upon notice by 25% or more in principal
amount of the McLeodUSA notes to the trustee, the trustee shall give notice to
McLeodUSA and the holders of such Indebtedness (or trustees or agents therefor)
of a payment blockage, and thereafter no payments of principal of (or premium,
if any) or interest on or otherwise due in respect of such Indebtedness may be
made for a period of 179 days from the date of such notice; and (iii) such
Indebtedness may not (x) provide for payments of principal of such Indebtedness
at the stated maturity thereof or by way of a sinking fund applicable thereto or
by way of any mandatory redemption, defeasance, retirement or repurchase thereof
by McLeodUSA (including any redemption, retirement or repurchase which is
contingent upon events or circumstances, but excluding any retirement required
by virtue of acceleration of such Indebtedness upon an event of default
thereunder), in each case prior to the final Stated Maturity of the McLeodUSA
notes or (y) permit redemption or other retirement

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(including pursuant to an offer to purchase made by McLeodUSA) of such other
Indebtedness at the option of the holder thereof prior to the final Stated
Maturity of the McLeodUSA notes, other than a redemption or other retirement at
the option of the holder of such Indebtedness (including pursuant to an offer to
purchase made by McLeodUSA) which is conditioned upon a change of control of
McLeodUSA pursuant to provisions substantially similar to those described under
"--Repurchase at the Option of Holders upon a Change of Control" (and which
shall provide that such Indebtedness will not be repurchased pursuant to such
provisions prior to McLeodUSA's repurchase of the McLeodUSA notes required to be
repurchased by McLeodUSA pursuant to the provisions described under
"--Repurchase at the Option of Holders upon a Change of Control").

    "Subsidiary" means, with respect to any Person, (i) any corporation more
than 50% of the outstanding shares of Voting Stock of which is owned, directly
or indirectly, by such Person, or by one or more other Subsidiaries of such
Person, or by such Person and one or more other Subsidiaries of such Person,
(ii) any general partnership, limited liability company, joint venture or
similar entity, more than 50% of the outstanding partnership, membership or
similar interests of which are owned, directly or indirectly, by such Person, or
by one or more other Subsidiaries of such Person, or by such Person and one or
more other Subsidiaries of such Person and (iii) any limited partnership of
which such Person or any Subsidiary of such Person is a general partner.

    "Telecommunications Assets" means all assets, rights (contractual or
otherwise) and properties, whether tangible or intangible, used or intended for
use in connection with a Telecommunications Business.

    "Telecommunications Business" means the business of (i) transmitting, or
providing services relating to the transmission of, voice, video or data through
owned or leased wireline or wireless transmission facilities, (ii) creating,
developing, constructing, installing, repairing, maintaining or marketing
communications-related systems, network equipment and facilities, software and
other products, (iii) creating, developing, producing or marketing audiotext or
videotext, (iv) publishing or distributing telephone (including Internet)
directories, whether in paper, electronic, audio or video format, (v) marketing
(including direct marketing and telemarketing), or (vi) evaluating,
participating in or pursuing any other business that is primarily related to
those identified in the foregoing clauses (i), (ii), (iii), (iv) or (v) above
(in the case of clauses (iii), (iv) and (v), however, in a manner consistent
with McLeodUSA's manner of business on the Issue Date), and shall, in any event,
include all businesses in which McLeodUSA or any of its Subsidiaries are engaged
on the Issue Date; provided that the determination of what constitutes a
Telecommunications Business shall be made in good faith by the board of
directors.

    "Trading Day" means, with respect to a security traded on a securities
exchange, automated quotation system or market, a day on which such exchange,
system or market is open for a full day of trading.

    "Unrestricted Subsidiary" means any Subsidiary of McLeodUSA that McLeodUSA
has classified as an "Unrestricted Subsidiary" and that has not been
reclassified as a Restricted Subsidiary, pursuant to the terms of the McLeodUSA
indenture.

    "Voting Stock" means, with respect to any Person, securities of any class or
classes of Capital Stock in such Person entitling the holders thereof (whether
at all times or at the times that such class of Capital Stock has voting power
by reason of the happening of any contingency) to vote in the election of
members of the board of directors or comparable body of such Person.

    "Wholly-Owned Restricted Subsidiary" of any Person means a Subsidiary of
such Person all of the outstanding Capital Stock or other ownership interests
(other than any director's qualifying shares) of which shall at the time be
owned by such Person or by one or more other Wholly-Owned Restricted
Subsidiaries of such Person or by such Person and one or more other Wholly-Owned
Restricted Subsidiaries of such Person.

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                          OTHER MCLEODUSA INDEBTEDNESS

    On March 4, 1997, we completed an offering of $500 million aggregate
principal amount at maturity of our 10 1/2% senior discount notes. Our 10 1/2%
senior discount notes were priced at a discount and we received net proceeds of
approximately $288.9 million from the offering of our 10 1/2% senior discount
notes. Our 10 1/2% senior discount notes will accrete to an aggregate principal
amount of $500 million by March 1, 2002. Interest will not accrue on our 10 1/2%
senior discount notes prior to March 1, 2002. Thereafter, interest will accrue
at a rate of 10 1/2%% per annum, which will be payable in cash semi-annually in
arrears on March 1 and September 1 of each year, commencing September 1, 2002.
Our 10 1/2% senior discount notes rank PARI PASSU in right of payment with our
9 1/4% senior notes, 8 3/8% senior notes, 9 1/2% senior notes, 8 1/8% senior
notes and the McLeodUSA notes. Our 10 1/2% senior discount notes will mature on
March 1, 2007 and will be payable prior to the maturity of our 9 1/4% senior
notes, 8 3/8% senior notes, 9 1/2% senior notes, 8 1/8% senior notes and the
McLeodUSA notes.

    On July 21, 1997, we completed an offering of $225 million principal amount
of our 9 1/4% senior notes. We received net proceeds of approximately $217.6
million from the offering of our 9 1/4% senior notes. Our 9 1/4% senior notes
accrue interest at a rate of 9 1/4% per annum, which is payable in cash
semi-annually in arrears on July 15 and January 15 of each year, commencing
January 15, 1998. Our 9 1/4% senior notes rank PARI PASSU in right of payment
with our 10 1/2% senior discount notes, 8 3/8% senior notes, 9 1/2% senior
notes, 8 1/8% senior notes and the McLeodUSA notes. Our 9 1/4% senior notes will
mature on July 15, 2007 and will be payable prior to the maturity of our 8 3/8%
senior notes, 9 1/2% senior notes, 8 1/8% senior notes and the McLeodUSA notes.

    On March 16, 1998, we completed an offering of $300 million principal amount
of our 8 3/8% senior notes. We received net proceeds of approximately $291.9
million from the offering of our 8 3/8% senior notes. Our 8 3/8% senior notes
accrue interest at a rate of 8 3/8% per annum, which is payable in cash
semi-annually in arrears on March 15 and September 15 of each year, commencing
September 15, 1998. Our 8 3/8% senior notes rank PARI PASSU in right of payment
with our 10 1/2% senior discount notes, 9 1/4% senior notes, 9 1/2% senior
notes, 8 1/8% senior notes and the McLeodUSA notes. Our 8 3/8% senior notes will
mature on March 15, 2008 and will be payable prior to the maturity of our 9 1/2%
senior notes, 8 1/8% senior notes and the McLeodUSA notes.

    On October 30, 1998, we completed an offering of $300 million principal
amount of our 9 1/2% senior notes. We received net proceeds of approximately
$291.9 million from the offering of our 9 1/2% senior notes. Our 9 1/2% senior
notes accrue interest at a rate of 9 1/2% per annum, which is payable in cash
semi-annually in arrears on May 1 and November 1 of each year, commencing May 1,
1999. Our 9 1/2% senior notes rank PARI PASSU in right of payment with our
10 1/2% senior discount notes, 9 1/4% senior notes, 8 3/8% senior notes, 8 1/8%
senior notes and the McLeodUSA notes. Our 9 1/2% senior notes will mature on
November 1, 2008 and will be payable prior to the maturity of our 8 1/8% senior
notes.

    On February 22, 1999, we completed an offering of $500 million principal
amount of our 8 1/8% senior notes. We received net proceeds of approximately
$487.8 million from the offering of our 8 1/8% senior notes. Our 8 1/8% senior
notes accrue interest at a rate of 8 1/8% per annum, which is payable in cash
semi-annually in arrears on February 15 and August 15 of each year, commencing
August 15, 1999. Our 8 1/8% senior notes rank PARI PASSU in right of payment
with our 10 1/2% senior discount notes, 9 1/4% senior notes, 8 3/8% senior
notes, 9 1/2% senior notes and the McLeodUSA notes. Our 8 1/8% senior notes will
mature on February 15, 2009.

    The indentures governing our 10 1/2% senior discount notes, 9 1/4% senior
notes, 8 3/8% senior notes, 9 1/2% senior notes and 8 1/8% senior notes impose
operating and financial restrictions on us and our subsidiaries that are
substantially the same as the restrictions governing the McLeodUSA notes. These
restrictions affect, and in some cases significantly limit or prohibit, among
other things, our ability and the ability of our subsidiaries to incur
additional indebtedness, pay dividends or make distributions in respect of our
or such subsidiaries' capital stock, make other restricted payments, enter into
sale and

                                       84
<PAGE>
leaseback transactions, create liens upon assets, enter into transactions with
affiliates, sell assets, or consolidate, merge or sell all or substantially all
of our, or our subsidiaries' assets. There can be no assurance that such
covenants will not adversely affect our ability to finance our future operations
or capital needs or to engage in other business activities that may be in our
interest.

    If the Concurrent Exchange Offer is consummated, we will issue up to $210
million of additional senior notes. These notes will be due May 1, 2009 and will
rank PARI PASSU in right of payment with the McLeodUSA notes and the other
senior notes referred to above. In addition, the McLeodUSA notes will be
effectively subordinated in certain respects to any CapRock notes and any
CapRock 11 1/2 senior notes due 2009 that remain outstanding after this exchange
offer and the Concurrent Exchange Offer, for which CapRock will remain the
obligor.

    On May 31, 2000 we put in place $1.3 billion of senior secured credit
facilities with a syndicate of financial institutions (the "Senior Secured
Credit Facilities"). The Senior Secured Credit Facilities consist of (1) a
seven-year senior secured revolving facility with an aggregate principal amount
of $450 million (the "Revolving Facility"), (2) a seven-year senior secured
multi-draw term loan facility with an aggregate principal amount of
$275 million (the "Tranche A Term Facility"), and (3) an eight-year single-draw
senior secured term loan with an aggregate principal amount of $575 million (the
"Tranche B Term Facility"). The Tranche A Term Facility provides for multiple
($50 million minimum) draws for the first 24 months of the agreement, at the end
of which period any undrawn commitments expire. At June 30, 2000 the Tranche B
Term Facility was drawn in full and the balance of the other facilities remained
undrawn.

    The Senior Secured Credit Facilities are secured by (1) a first priority
pledge of all the capital stock owned by us and by each subsidiary, and (2) a
perfected first priority security interest in substantially all our tangible and
intangible assets and, to the extent of $100 million, by each subsidiary. In
addition, telecommunications assets acquired with proceeds or refinanced from
the Senior Secured Credit Facilities serve as collateral.

    Interest on the Senior Secured Credit Facilities is payable quarterly and
variable at LIBOR plus 1% to LIBOR plus 3.25%, based our debt rating. At our
current debt rating, interest rates are LIBOR plus 2.25% on the Revolving
Facility and Tranche A Term Facility, and LIBOR plus 3.00% on the Tranche B Term
Facility. We must maintain certain financial covenants requiring minimum
revenue, minimum access lines and debt to capital and debt to EBITDA ratios.

                                       85
<PAGE>
                           INFORMATION ABOUT CAPROCK

GENERAL

    CAPROCK.  CapRock is a facilities-based integrated communications service
provider primarily to small and medium-sized business and communications carrier
customers in the Southwestern United States. CapRock offers business customers
an integrated bundle of communications products and services including local
exchange, domestic and international long distance, enhanced voice, data,
Internet, DSL and dedicated private line services. Additionally, CapRock offers
its communications-intensive business and carrier customers dark fiber, high
bandwidth dedicated fiber infrastructure, terminating access for domestic and
international long distance and ATM, frame relay and IP data transport services.

    CapRock's communications services are provided through resale and over its
fiber, voice and data networks. As of June 30, 2000, CapRock's network covered
approximately 4,500 route miles (including 22 metro fiber loops in key markets).
Additionally, as of June 30, 2000, CapRock provided switch-based competitive
local exchange services in 13 markets. As of June 30, 2000, CapRock had 12 voice
and 17 data switches installed and operational on its network.

    CapRock had 61 central office collocations at June 30, 2000. Additionally,
CapRock is implementing its DSL footprint through its recent agreement with a
third party supplier of DSL services. These collocations enable CapRock to
provide local and other services over its own network infrastructure, thereby
lowering its cost of providing these services.

    CAPROCK'S NETWORK.  CapRock's fiber network is comprised primarily of 96
fiber strands pulled through one of four conduits buried below ground. A key
element of CapRock's strategy is to reduce the cost basis of fiber it retains
for its own use by sharing construction costs with other carriers and to quickly
recover its investment by selling excess dark fiber. CapRock plans to retain at
least 24 fiber strands throughout its entire network. CapRock is also building a
competitive local exchange service in 48 markets where it will provide Class 5
switching functionality and DSL services to its local customers. CapRock's data
network will consist of data switches and fiber capacity that will connect all
of these markets, supporting ATM, frame relay and IP traffic. In many of these
local markets CapRock will install equipment to backhaul its voice and data
traffic to one of its switches in order to significantly lower its capital
requirements.

    INFORMATION TECHNOLOGY SYSTEMS AND ELECTRONIC BONDING.  CapRock is
automating most of the processes involved with switching a customer to its
network in order to decrease the time between receipt of a customer order and
completion of service installation. To achieve this goal, CapRock is acquiring,
integrating and developing information technology systems and platforms to
support its operations. CapRock has established and will continue to implement
"electronic bonding," which is the on-line and real-time connection of its
operating systems with those of ILECs. Additionally, CapRock has developed and
intends to roll out web-enabled ordering, billing and customer service features
to its customers.

    CapRock has completed testing and began utilizing electronic bonding with
Southwestern Bell Telephone. Electronic bonding with Southwestern Bell has
enabled CapRock to reduce its provisioning times from approximately 25 business
days to as few as five business days. Orders submitted with electronic bonding
are also less likely to be rejected by Southwestern Bell, resulting in a greater
percentage of customers being transitioned to CapRock's facilities in a shorter
amount of time.

    JOINT BUILD PROJECTS.  CapRock has entered into joint fiber construction
agreements with AT&T, Enron Broadband Services, Inc., Pathnet, Inc. and
360networks, Inc. The joint construction arrangements provide several benefits,
including reduction of construction costs, accelerated construction, and the
freeing up of resources to focus attention on the construction of additional

                                       86
<PAGE>
portions of CapRock's network. To further recover the cost of building its fiber
network, CapRock has sold and intends to continue to sell excess dark fiber.

    SALES ORGANIZATION.  CapRock uses a direct sales force to sell its
communications products and services to business customers. CapRock believes
that its face-to-face sales efforts coupled with its personalized customer care
are highly effective in capturing and retaining market share among small and
medium-sized businesses. CapRock had 251 sales force employees as of June 30,
2000. CapRock provides its sales force with financial incentives that promote a
high level of ongoing customer care and loyalty.

    Additionally, as of June 30, 2000, CapRock had 267 independent sales agents
who contributed to its sales efforts throughout the region, primarily in smaller
markets. CapRock's agent program was established in 1996, and consists primarily
of independent telephone equipment vendors authorized by CapRock to market its
products and services. Authorized agents receive recurring commissions based on
product, pricing, volume of usage and customer loyalty. CapRock has six agent
managers who actively recruit new independent sales agents.

    LITIGATION.  On July 26, 2000, a class action complaint was filed in the
United States District Court for the Northern District of Texas on behalf of all
purchasers of CapRock common stock during the period between April 28, 2000 and
July 6, 2000. Additional stockholder suits have been filed subsequently, also in
the United States District Court for Northern District of Texas. The named
defendants in these lawsuits, which allege that CapRock made material
misstatements or omissions of fact in violation of Section 10(b) of the
Securities Exchange Act, include CapRock and certain of its officers and
directors. The plaintiffs in the lawsuits seek monetary damages. CapRock
believes that the lawsuits are without merit and intends to vigorously defend
the pending suits and any other similar suits subsequently filed.

    On October 6, 2000, a class action complaint was filed in the County Court
at Law of Dallas County, Texas on behalf of CapRock's stockholders. This
complaint names as defendants CapRock and each member of its board of directors
and principally alleges that the directors violated fiduciary duties owed to
CapRock's stockholders in connection with entering into the merger agreement.
The plaintiffs in the lawsuit seek both unspecified monetary damages and an
injunction to prevent completion of the merger. CapRock believes that the
lawsuit is without merit and intends to vigorously defend the lawsuit.

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

    CapRock is a Texas corporation that was formed on February 3, 1998 to be a
holding company for its predecessor companies. The principal executive offices
of CapRock are located at 15601 Dallas Parkway, Suite 700, Dallas, Texas 75001,
and its phone number is 972-982-9550.

ADDITIONAL INFORMATION

    A detailed description of the CapRock business, executive compensation,
various benefit plans, including stock option plans, voting securities and the
principal holders of these securities, relationships and transactions between
CapRock and its executive officers, directors and principal stockholders,
financial statements and other matters related to CapRock is incorporated by
reference or set forth in the CapRock Annual Report on Form 10-K for the year
ended December 31, 1999 and the CapRock Quarterly Reports on Form 10-Q for the
quarters ended March 31, 2000 and June 30, 2000, incorporated by reference into
this prospectus. Holders of CapRock notes desiring copies of such documents may
contact McLeodUSA at its address or telephone number indicated under "Where You
Can Find More Information."

                                       87
<PAGE>
                SELECTED CONSOLIDATED FINANCIAL DATA OF CAPROCK

    The following table sets forth financial data as of and for the years ended
December 31, 1995, 1996, 1997, 1998 and 1999 and as of and for the six months
ended June 30, 1999 and 2000. The business combination among CapRock's
predecessor companies was completed on August 26, 1998 and was accounted for as
a pooling of interests. Accordingly, these Consolidated Financial Statements
include CapRock's three predecessor companies (CapRock Telecommunications Corp.,
CapRock Fiber Network, LTD. and IWL Communications, Incorporated) as though
these entities were always a part of CapRock.

    In May 1998, IWL Communications changed its fiscal year end to coincide with
the fiscal years of CapRock, CapRock Telecommunications and CapRock Fiber. The
Consolidated Statement of Operations for the year ended December 31, 1996
combines the operating activity of IWL Communications for the year ended June
30, 1996 with the operating activity of CapRock Telecommunications and CapRock
Fiber for the year ended December 31, 1996. The net income of IWL Communications
in the amount of approximately $260,000 for the six month period ended December
31, 1996 was excluded from the Consolidated Statement of Operations for the year
ended December 31, 1996 as a result of the non-conforming year ends for such
period. This amount was included as an adjustment to retained earnings in the
Consolidated Statement of Stockholders' Equity and Comprehensive Income in 1997.
IWL Communications' cash flow for this period was added to the 1997 beginning
balance in the Consolidated Statement of Cash Flows.

<TABLE>
<CAPTION>
                                                                 AS OF AND FOR THE YEAR ENDED DECEMBER 31,
                                                            ----------------------------------------------------
                                                              1995       1996       1997       1998       1999
                                                            --------   --------   --------   --------   --------
                                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                         <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenues..................................................  $29,407    $50,970    $75,349    $121,774   $192,623
Costs of Services.........................................   21,185     39,357     52,471      83,221    115,676
                                                            -------    -------    -------    --------   --------
    Gross profit..........................................    8,222     11,613     22,878      38,553     76,947
Operating expenses:
  Selling, general and administrative.....................    7,326      8,983     14,074      23,528     56,535
  Merger related expenses.................................       --         --         --       2,313         --
  Depreciation and amortization...........................    1,186      1,536      3,346       4,887      9,698
                                                            -------    -------    -------    --------   --------
    Total operating expenses..............................    8,512     10,519     17,420      30,728     66,233
                                                            -------    -------    -------    --------   --------
Operating income (loss)...................................     (290)     1,094      5,458       7,825     10,714
Interest expense, net.....................................     (484)      (585)    (1,603)     (6,441)   (17,861)
Other income (expense)....................................      151         42        220         106      1,526
                                                            -------    -------    -------    --------   --------
Income (loss) before income taxes and extraordinary
  item....................................................     (623)       551      4,075       1,490     (5,621)
Income tax expense (benefit)..............................       48        227      1,513       1,267     (2,080)
                                                            -------    -------    -------    --------   --------
Income (loss) before extraordinary item...................     (671)       324      2,562         223     (3,541)
Extraordinary item -- extinguishment of debt..............      645         --         --          --         --
                                                            -------    -------    -------    --------   --------
    Net income (loss).....................................  $   (26)   $   324    $ 2,562    $    223   $ (3,541)
                                                            =======    =======    =======    ========   ========
Pro forma net income (loss):
  Income (loss) before income taxes and extraordinary
    item..................................................  $  (623)   $   551    $ 4,075    $  1,490   $ (5,621)
  Pro forma income taxes, as if CapRock Fiber were a
    C corporation.........................................     (211)       143      1,475       1,267     (2,080)
                                                            -------    -------    -------    --------   --------
  Income (loss) before extraordinary item.................     (412)       408      2,600         223     (3,541)
  Extraordinary item, net of taxes........................      397         --         --          --         --
                                                            -------    -------    -------    --------   --------
    Pro forma net income (loss)...........................  $   (15)   $   408    $ 2,600    $    223   $ (3,541)
                                                            =======    =======    =======    ========   ========
Historical and pro forma income (loss) per common share:
  Income (loss) before extraordinary item.................  $ (0.02)   $  0.01    $  0.09    $   0.01   $  (0.11)
  Extraordinary item, net of tax..........................  $  0.02         --         --          --         --
                                                            -------    -------    -------    --------   --------
  Basic and diluted.......................................  $    --    $  0.01    $  0.09    $   0.01   $  (0.11)
                                                            =======    =======    =======    ========   ========
Weighted average shares outstanding:
  Basic...................................................   25,926     27,146     27,984      28,899     31,727
  Diluted.................................................   25,936     27,156     28,481      30,028     31,727
</TABLE>

                                       88
<PAGE>
                SELECTED CONSOLIDATED FINANCIAL DATA OF CAPROCK
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                               SIX MONTHS ENDED
                                                                   JUNE 30,
                                                              -------------------
                                                                1999       2000
                                                              --------   --------
<S>                                                           <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenues....................................................  $ 74,596   $113,936
Costs of Services...........................................    44,919     79,220
                                                              --------   --------
    Gross profit............................................    29,677     34,716
Operating expenses:
  Selling, general and administrative.......................    25,012     43,398
  Merger related expenses...................................        --         --
  Depreciation and amortization.............................     3,337      9,077
                                                              --------   --------
    Total operating expenses................................    28,349     52,475
                                                              --------   --------
Operating income (loss).....................................     1,328    (17,759)
Interest expense, net.......................................    (7,134)    (7,021)
Other income (expense)......................................      (135)        25
                                                              --------   --------
Income (loss) before income taxes and extraordinary item....    (5,941)   (24,755)
Income tax expense (benefit)................................    (2,335)    (9,118)
                                                              --------   --------
Income (loss) before extraordinary item.....................    (3,606)   (15,637)
Extraordinary item -- extinguishment of debt................        --         --
                                                              --------   --------
    Net income (loss).......................................  $  3,606   $(15,637)
                                                              ========   ========
Pro forma net income (loss):
  Income (loss) before income taxes and extraordinary
    item....................................................  $ (5,941)  $(24,755)
  Pro forma income taxes, as if CapRock Fiber were a C
    corporation.............................................    (2,335)    (9,118)
                                                              --------   --------
  Income (loss) before extraordinary item...................    (3,606)   (15,637)
  Extraordinary item, net of taxes..........................        --         --
                                                              --------   --------
    Pro forma net income (loss).............................  $ (3,606)  $(15,637)
                                                              ========   ========
Historical and pro forma income (loss) per common share:
  Income (loss) before extraordinary item...................  $  (0.12)  $  (0.47)
  Extraordinary item, net of tax............................        --         --
                                                              --------   --------
  Basic and diluted.........................................  $  (0.12)  $  (0.47)
                                                              ========   ========
Weighted average shares outstanding:
  Basic.....................................................    30,321     33,406
  Diluted...................................................    30,321     33,406
</TABLE>

                                       89
<PAGE>
                SELECTED CONSOLIDATED FINANCIAL DATA OF CAPROCK
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                    AS OF AND FOR THE YEAR ENDED DECEMBER 31,
                                              ------------------------------------------------------
                                                1995       1996       1997       1998        1999
                                              --------   --------   --------   ---------   ---------
<S>                                           <C>        <C>        <C>        <C>         <C>
BALANCE SHEET DATA:
Working capital (deficit)...................  $  (797)   $ (2,153)  $   (305)  $ 102,489   $ 216,145
Property, plant and equipment, net..........    6,705      15,901     27,341      59,607     228,601
Total assets................................   13,198      28,522     49,389     191,966     548,835
Long-term debt and capital lease
  obligations...............................    2,443      13,254     21,062     145,187     347,502
Stockholders' equity........................    3,552       3,886     14,086      16,062      96,030

OPERATING DATA:
EBITDA(1) ..................................  $   896    $  2,630   $  8,804   $  15,025   $  20,412
Cash flows provided by (used in)
  operations................................      827         781      4,112       7,125     (13,302)
Cash flows used in investing activities.....   (1,919)     (9,350)   (12,987)   (134,350)   (264,623)
Cash flows provided by financing
  activities................................      903       8,605     12,114     123,990     283,338
Capital expenditures........................   (2,282)    (10,212)   (13,631)    (36,855)   (201,289)
</TABLE>

<TABLE>
<CAPTION>
                                                                SIX MONTHS ENDED
                                                                    JUNE 30,
                                                              ---------------------
                                                                1999        2000
                                                              ---------   ---------
<S>                                                           <C>         <C>
BALANCE SHEET DATA:
Working capital (deficit)...................................  $ 337,555   $ 104,312
Property, plant and equipment, net..........................     97,360     423,039
Total assets................................................    479,533     676,174
Long-term debt and capital lease obligations................    347,012     348,218
Stockholders' equity........................................     94,939     177,738

OPERATING DATA:
EBITDA(1) ..................................................  $  (4,665)  $  (8,682)
Cash flows provided by (used in) operations.................    (14,897)     50,799
Cash flows used in investing activities.....................   (258,169)   (159,910)
Cash flows provided by financing activities.................    283,872     107,113
Capital expenditures........................................    (45,717)   (216,263)
</TABLE>

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

(1) EBITDA consists of operating income or loss before interest, income taxes,
    depreciation and amortization and other nonrecurring operating expenses.
    EBITDA is a measure commonly used in the communications industry. EBITDA is
    not a measure of financial performance under generally accepted accounting
    principles and should not be considered as an alternative to net income as a
    measure of performance nor as an alternative to cash flow as a measure of
    liquidity.

                                       90
<PAGE>
                        DESCRIPTION OF THE CAPROCK NOTES

    The CapRock notes were issued under the indenture, dated as of July 16,
1998, among CapRock, CapRock Telecommunications Corp., CapRock Fiber Network,
LTD., IWL Communications, Incorporated and Chase Manhattan Trust Company,
National Association, as successor trustee under the indenture.

    We refer to this indenture as the CapRock indenture. The terms of the
CapRock notes include those stated in the CapRock indenture and those made a
part of the CapRock indenture by reference to the Trust Indenture Act of 1939 as
in effect on the date of the CapRock indenture. The CapRock notes are subject to
all of those terms, and holders of the CapRock notes should refer to the CapRock
indenture and the Trust Indenture Act for a complete statement of the applicable
terms. The CapRock indenture has been filed as an exhibit to the registration
statement of which this prospectus is a part, and copies of the CapRock
indenture are available upon request from McLeodUSA.

    The following summary contains a description of certain provisions of the
CapRock indenture and the CapRock notes but does not purport to be complete and
is subject to, and is qualified in its entirety by reference to, the provisions
of the CapRock notes and the CapRock indenture, including the definitions of
certain terms contained therein and those terms made part of the CapRock
indenture through the incorporation by reference of the Trust Indenture Act.
Capitalized terms used in the following summary but not otherwise defined have
the meanings attributed to them in the CapRock indenture and the CapRock notes.
For definitions of certain capitalized terms used in the following summary, see
"--Certain Definitions."

CONSENT SOLICITATION

    On October 11, 2000, CapRock commenced a solicitation of consents from the
holders of the CapRock notes to amend the CapRock indenture to (a) modify
certain restrictive covenants contained in the CapRock indenture in order to
permit the merger of CapRock with a wholly-owned subsidiary of McLeodUSA, (b)
allow the merger of CapRock and the McLeodUSA subsidiary to be consummated
without triggering the change of control provisions of the CapRock indenture and
(c) eliminate most of the restrictive covenants and reporting requirements
contained in the CapRock indenture. See "--The Proposed Amendments." As of
October 27, 2000, CapRock had received consents from holders of a majority of
the aggregate principal amount of the CapRock notes to such amendments.

    Any CapRock notes that are not tendered to us or are not accepted for
exchange will remain outstanding and will continue to accrue interest in
accordance with and otherwise be entitled to all of the rights and privileges
under the indenture governing the CapRock notes. CapRock expects shortly to
amend the indenture as summarized in the preceding paragraph and the holders of
any CapRock notes that remain outstanding after the exchange offer will be
without the protection that the deleted restrictive covenants and reporting
requirements gave them. The elimination of these restrictive covenants and other
provisions will permit CapRock to, among other things, incur indebtedness, pay
dividends and make other restricted payments, incur liens and make investments
which would otherwise not have been permitted under the CapRock indenture. It is
possible that any such actions that CapRock will be permitted to take as a
result of the changes to the CapRock indenture will increase the risk with
respect to the CapRock notes.

    Notwithstanding the merger, CapRock will remain the obligor under the
CapRock indenture and any CapRock notes that remain outstanding after
consummation of the exchange offer.

    Unless otherwise indicated, the summary of the terms of the CapRock notes
set forth below does not give effect to the amendments referred to in this
section.

                                       91
<PAGE>
GENERAL DESCRIPTION OF THE CAPROCK NOTES

    The CapRock notes are general unsecured unsubordinated obligations of
CapRock, limited to $150,000,000 aggregate principal amount, and mature on July
15, 2008. Each CapRock note bears interest at the rate of 12% from the most
recent Interest Payment Date to which interest has been paid or provided for,
payable semiannually (to Holders of record at the close of business on the
January 1 or July 1 immediately preceding the Interest Payment Date) on January
15 and July 15 of each year. Interest is computed on the basis of a 360-day year
comprised of twelve 30-day months.

    Principal of, premium, if any, and interest on the CapRock notes are
payable, and the CapRock notes may be exchanged or transferred, at the office or
agency of CapRock in the Borough of Manhattan, The City of New York; PROVIDED
THAT, at the option of CapRock, payments of interest may be made by check mailed
to the Holders at their addresses as they appear in the Security Register.

    The CapRock notes were issued only in fully registered form, without
coupons, in denominations of $1,000 principal amount and integral multiple
thereof. See "Book-Entry; Delivery and Form." No service charge will be made for
any registration of transfer or exchange of the CapRock notes, but CapRock may
require payment of a sum sufficient to cover any transfer tax or other similar
governmental charge payable in connection therewith.

OPTIONAL REDEMPTION

    The CapRock notes will be redeemable, at CapRock's option, in whole or in
part, at any time or from time to time, on or after July 15, 2003 and prior to
maturity, upon not less than 30 nor more than 60 days' prior notice mailed by
first class mail to each Holder's last address, as it appears in the Security
Register, at the following Redemption Prices (expressed in percentages of
principal amount), plus accrued and unpaid interest to the Redemption Date
(subject to the right of Holders of record on the relevant record date that is
prior to the Redemption Date to receive interest due on an Interest Payment
Date), if redeemed during the 12-month period beginning on July 15 of the years
set forth below:

<TABLE>
<CAPTION>
YEAR                                                          REDEMPTION PRICE
----                                                          ----------------
<S>                                                           <C>
2003........................................................      106.000%
2004........................................................      104.000%
2005........................................................      102.000%
2006 and thereafter.........................................      100.000%
</TABLE>

    If less than all of the CapRock notes are to be redeemed at any time, the
trustee will select the CapRock notes, or portions thereof, for redemption in
compliance with the requirements of the principal national securities exchange,
if any, on which the CapRock notes are listed or, if the CapRock notes are not
listed on a national securities exchange, on a pro rata basis, by lot or by such
other method as the trustee in its sole discretion shall deem to be fair and
appropriate; PROVIDED THAT no CapRock note of $1,000 in principal amount or less
shall be redeemed in part. If any CapRock note is to be redeemed in part only,
the notice of redemption relating to such CapRock note shall state the portion
of the principal amount thereof to be redeemed. A new CapRock note in principal
amount equal to the unredeemed portion thereof will be issued in the name of the
Holder thereof upon cancellation of the original CapRock note.

CAPROCK NOTES CALLED FOR REDEMPTION CEASE TO BE OUTSTANDING

    CapRock notes called for redemption in accordance with the terms of the
CapRock indenture will be deemed to be paid and discharged and cease to be
outstanding, and interest on such CapRock notes will cease to accrue, from and
after the date set for redemption if CapRock has deposited with the trustee, in
trust, money and/or Temporary Cash Investments that, through the payment of
interest and

                                       92
<PAGE>
principal in respect thereof in accordance with their terms, will provide money
in an amount sufficient to pay the principal of, premium, if any, and accrued
interest on the CapRock notes on the Redemption Date in accordance with the
terms of the CapRock indenture and the CapRock notes.

RANKING

    The Indebtedness evidenced by the CapRock notes ranks PARI PASSU in right of
payment with all existing and future unsecured senior indebtedness of CapRock
and senior in right of payment to all existing and future indebtedness of
CapRock expressly subordinated in right of payment to the CapRock notes. As of
June 30, 2000, CapRock had outstanding debt and other liabilities of
approximately $263 million (in addition to the $150 million evidenced by the
CapRock notes). None of such debt or liabilities ranked senior in right of
payment to the CapRock notes. As of the same date, CapRock's subsidiaries had no
outstanding debt (other than trade payables).

    CapRock is a holding company with no direct operations and no significant
assets other than the stock and other equity interests of its subsidiaries.
CapRock's subsidiaries have no direct obligation to pay amounts due on the
CapRock notes and have not guaranteed the CapRock notes. As a result, the
CapRock notes are effectively subordinated to all existing and future
indebtedness and other liabilities (including trade payables) of CapRock's
subsidiaries. As of June 30, 2000, CapRock's subsidiaries had approximately $97
million of liabilities (excluding intercompany payables), all of which are
structurally senior to the CapRock notes. CapRock is dependent upon access to
the cash flow or assets of its subsidiaries to make payments on the CapRock
notes, and CapRock's ability to obtain such access may be limited by law.

    CapRock, CapRock Telecommunications Corp. and CapRock Fiber Network, LTD.
have entered into a $100 million secured Credit Facility. This Credit Facility
is secured by substantially all of the assets of each of CapRock's subsidiaries.
The CapRock notes are unsecured. This means that in the event of a default on
the secured debt, the secured creditors could foreclose on their collateral and
receive payment out of the proceeds of that collateral prior to the CapRock
noteholders. CapRock and its subsidiaries are permitted to incur certain
additional indebtedness and, in limited situations, to secure such indebtedness.
The CapRock notes are effectively subordinated to such security interests to the
extent of such security interests.

CERTAIN COVENANTS

    The CapRock indenture contains, among others, the following covenants:

    LIMITATION ON INDEBTEDNESS.

    The CapRock indenture provides that CapRock will not, and will not permit
any of its Restricted Subsidiaries to, Incur any Indebtedness (including
Acquired Indebtedness) other than Permitted Indebtedness; PROVIDED THAT CapRock
may Incur Indebtedness, in addition to Permitted Indebtedness, if, after giving
effect to the Incurrence of such Indebtedness and the receipt and application of
the proceeds thereof, (i) the Consolidated Leverage Ratio would be less than or
equal to 7.0 to 1, for Indebtedness Incurred on or prior to June 30, 2000, or
less than or equal to 5.0 to 1, for Indebtedness Incurred thereafter and
(ii) no Default or Event of Default shall have occurred and be continuing or
occur as a consequence of the actions set forth in this covenant.

    Notwithstanding any other provision of the foregoing "Limitation on
Indebtedness" covenant, the maximum amount of Indebtedness that CapRock or a
Restricted Subsidiary may Incur pursuant to this "Limitation on Indebtedness"
covenant shall not be deemed to be exceeded due solely to the result of
fluctuations in the exchange rates of currencies.

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    For purposes of determining any particular amount of Indebtedness under this
"Limitation on Indebtedness" covenant, (1) Guarantees, Liens or obligations with
respect to letters of credit supporting Indebtedness otherwise included in the
determination of such particular amount shall not be included and (2) any Liens
granted pursuant to the equal and ratable provisions referred to in the
"Limitation on Liens" covenant described below shall not be treated as
Indebtedness. For purposes of determining compliance with the foregoing
"Limitation on Indebtedness" covenant, in the event that an item of Indebtedness
meets the criteria of more than one of the types of Indebtedness described in
the definition of "Indebtedness," CapRock, in its sole discretion, shall
classify such item of Indebtedness and only be required to include the amount
and type of such Indebtedness in one of such clauses.

    LIMITATION ON RESTRICTED PAYMENTS.

    The CapRock indenture provides that CapRock will not, and will not permit
any Restricted Subsidiary to, directly or indirectly, make any Restricted
Payment if, at the time of, and after giving effect to, the proposed Restricted
Payment: (A) a Default or Event of Default shall have occurred and be
continuing, (B) CapRock could not Incur at least $1.00 of Indebtedness under
clause (i) of the first paragraph of the "Limitation on Indebtedness" covenant
or (C) the aggregate amount of all Restricted Payments (the amount, if other
than in cash, to be determined in good faith by the Board of Directors of
CapRock, whose determination shall be conclusive and evidenced by a Board
Resolution) made after the Closing Date shall exceed the sum of:

    (1) 50% of the aggregate amount of the Adjusted Consolidated Net Income (or,
if the Adjusted Consolidated Net Income is a loss, minus 100% of the amount of
such loss) accrued on a cumulative basis during the period (taken as one
accounting period) beginning on the first day of the fiscal quarter commencing
immediately following the Closing Date and ending on the last day of the last
fiscal quarter preceding the Calculation Date for which reports have been filed
with the SEC or provided to the trustee pursuant to the "SEC Reports and Reports
to Holders" covenant, plus

    (2) the aggregate Net Cash Proceeds received by CapRock after the Closing
Date (and, in the event the Transaction is consummated, the aggregate Net Cash
Proceeds received by CapRock Telecommunications Corp., CapRock Fiber Network,
LTD. or IWL Communications, Incorporated during the Transition Period), from a
capital contribution from, or the issuance and sale permitted by the CapRock
indenture to, a Person who is not a Subsidiary of CapRock (or CapRock
Telecommunications Corp., CapRock Fiber Network, LTD. or IWL Communications,
Incorporated, if applicable) of (a) its Capital Stock (other than Redeemable
Stock), (b) any options, warrants or other rights to acquire its Capital Stock
(in each case, exclusive of any Redeemable Stock or any options, warrants or
other rights that are redeemable at the option of the holder, or are required to
be redeemed, prior to the Stated Maturity of the CapRock notes) and (c)
Indebtedness of CapRock (and CapRock Telecommunications Corp., CapRock Fiber
Network, LTD. or IWL Communications, Incorporated during the Transition Period)
or a Restricted Subsidiary that has been exchanged for or converted into Capital
Stock of CapRock (or CapRock Telecommunications Corp., CapRock Fiber Network,
LTD. or IWL Communications, Incorporated, if applicable) (other than Redeemable
Stock) or such options, warrants or other rights, in each case except to the
extent such Net Cash Proceeds are used to Incur Indebtedness permitted under
clause (viii) of the definition of "Permitted Indebtedness," plus

    (3) an amount equal to the net reduction in Investments (other than
reductions in Permitted Investments and reductions in Investments made pursuant
to clause (vi) of the second paragraph of this "Limitation on Restricted
Payments" covenant) in any Person resulting from payments of interest on
Indebtedness, dividends, repayments of loans or advances, or other transfers of
assets, in each case to CapRock (or CapRock Telecommunications Corp., CapRock
Fiber Network, LTD. or IWL Communications, Incorporated during the Transition
Period) or any Restricted Subsidiary or from the Net Cash Proceeds from the sale
of any such Investment (except, in each case, to the extent any such

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payment or proceeds is included in the calculation of Adjusted Consolidated Net
Income), or from redesignations of Unrestricted Subsidiaries as Restricted
Subsidiaries (valued in each case as provided in the definition of
"Investments"), not to exceed, in each case, the amount of Investments
previously made by CapRock (or CapRock Telecommunications Corp., CapRock Fiber
Network, LTD. or IWL Communications, Incorporated, if applicable) or any
Restricted Subsidiary in such Person or Unrestricted Subsidiary.

    The foregoing provision shall not be violated by reason of:

    (i) the payment of any dividend within 60 days after the date of declaration
thereof if, at such date of declaration, such payment would comply with the
foregoing paragraph;

    (ii) the purchase, redemption, defeasance or other acquisition or retirement
for value of Indebtedness that is subordinated in right of payment to the
CapRock notes, including premium, if any, and accrued and unpaid interest
thereon to the date of payment, with the proceeds of, or in exchange for,
Indebtedness Incurred under clause (iii) of the definition of "Permitted
Indebtedness;"

    (iii) the purchase, redemption or other acquisition or retirement for value
of Capital Stock of CapRock (or options, warrants or other rights to acquire
such Capital Stock) in exchange for, or out of the proceeds of a substantially
concurrent offering to a Person who is not a Subsidiary of CapRock of, shares of
Capital Stock (other than Redeemable Stock) of CapRock (or options, warrants or
other rights to acquire such Capital Stock (exclusive of any options, warrants
or other rights that are redeemable at the option of the holder, or are required
to be redeemed, prior to the Stated Maturity of the CapRock notes)) including in
connection with a "cashless" exercise of an option, warrant or right;

    (iv) the making of any principal payment or the purchase, redemption,
retirement, defeasance or other acquisition for value of Indebtedness of CapRock
which is subordinated in right of payment to the CapRock notes, including
premium, if any, and accrued and unpaid interest thereon to the date of payment,
in exchange for, or out of the proceeds of, a substantially concurrent offering
to a Person who is not a Subsidiary of CapRock of, shares of the Capital Stock
(other than Redeemable Stock) of CapRock (or options, warrants or other rights
to acquire such Capital Stock (exclusive of any options, warrants or other
rights that are redeemable at the option of the holder, or are required to be
redeemed, prior to the Stated Maturity of the CapRock notes));

    (v) payments or distributions to dissenting stockholders pursuant to
applicable law in connection with the Transaction or the Special Partnership
Transaction or any consolidation, merger or transfer of assets that complies
with the provisions of the CapRock indenture applicable to mergers,
consolidations and transfers of all or substantially all of the property and
assets of CapRock;

    (vi) Investments in any Person that is in the Telecommunications Business on
the date of such Investments; PROVIDED THAT the aggregate amount of Investments
made pursuant to this clause (vi) does not exceed the sum of (x) $50 million
plus (y) the amount of Net Cash Proceeds received by CapRock after the Closing
Date (and, in the event the Transaction is consummated, the aggregate Net Cash
Proceeds received by CapRock Telecommunications Corp., CapRock Fiber Network,
LTD. or IWL Communications, Incorporated during the Transition Period) as a
capital contribution or from the sale of Capital Stock (other than Redeemable
Stock) of CapRock (or options, warrants or other rights to acquire such Capital
Stock (exclusive of any options, warrants or other rights that are redeemable at
the option of the holder, or are required to be redeemed, prior to the Stated
Maturity of the CapRock notes)) to a Person who is not a Subsidiary of CapRock
(or CapRock Telecommunications Corp., CapRock Fiber Network, LTD. or IWL
Communications, Incorporated, if applicable), except to the extent such Net Cash
Proceeds are used to Incur Indebtedness pursuant to clause (viii) under the
definition of "Permitted Indebtedness" or to make Restricted Payments pursuant
to clause (C)(2) of the first paragraph, or clauses (iii) or (iv) of this
paragraph, of this "Limitation on Restricted

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Payments" covenant, plus (z) the net reduction in Investments made pursuant to
this clause (vi) resulting from distributions on or repayments of such
Investments or from the Net Cash Proceeds from the sale of any such Investment
(except in each case to the extent any such payment or proceeds is included in
the calculation of Adjusted Consolidated Net Income) or from such Person
becoming a Restricted Subsidiary (valued in each case as provided in the
definition of "Investments"); PROVIDED THAT the net reduction in any Investment
shall not exceed the amount of such Investment;

    (vii) the purchase, redemption or other retirement or acquisition for value
of shares of Capital Stock of CapRock to the extent necessary, in the judgment
of the Board of Directors of CapRock, to prevent the loss or secure the renewal
or reinstatement of any license or franchise held by CapRock or any Restricted
Subsidiary from any governmental agency;

    (viii) the purchase, redemption or other retirement or acquisition for value
of shares of Capital Stock of CapRock, or options, warrants or other rights to
purchase such shares, held by directors, employees, or former directors or
employees of CapRock or any Restricted Subsidiary (or their estates or
beneficiaries under their estates) upon their death, disability, retirement or
termination of employment or pursuant to the terms of any agreement under which
such shares of Capital Stock or options were issued; PROVIDED THAT the aggregate
consideration paid for such purchase, redemption or other retirement or
acquisition for value of such shares of Capital Stock or options, warrants or
rights after the Closing Date does not exceed $2 million in any calendar year,
or $5 million in the aggregate;

    (ix) Investments acquired (x) as a capital contribution to CapRock or a
Restricted Subsidiary or (y) in exchange for Capital Stock (other than
Redeemable Stock) of CapRock (or options, warrants or other rights to acquire
such Capital Stock (exclusive of any options, warrants or other rights that are
redeemable at the option of the holder, or are required to be redeemed, prior to
the Stated Maturity of the CapRock notes)) so long as immediately after giving
effect to such transaction described in clause (y) above no Default or Event of
Default shall have occurred and be continuing;

    (x) the purchase, redemption, defeasance or other acquisition or retirement
for value of Indebtedness of CapRock which is subordinated in right of payment
to the CapRock notes, including premium, if any, and accrued and unpaid interest
thereon to the date of payment, at a price not greater than 101% of the
principal amount thereof plus any accrued and unpaid interest thereon to the
date of repayment in the event of a Change of Control in accordance with
provisions similar to the "Change of Control" covenant; PROVIDED THAT prior to
such purchase, redemption, defeasance or other acquisition or retirement,
CapRock has made the Change of Control Offer as provided in such covenant with
respect to the CapRock notes and has purchased all CapRock notes validly
tendered for payment in connection with such Change of Control Offer; or

    (xi) any payment, distribution, repurchase or other transaction that, but
for this provision, would constitute a Restricted Payment but only to the extent
that the aggregate amount of such payments, distributions, repurchases and other
transactions do not exceed $10 million.

    The actions described in clauses (i), (v), (vi), (vii), (viii), (x) and (xi)
of the immediately preceding paragraph will be Restricted Payments that will be
permitted in accordance with the immediately preceding paragraph but will reduce
the amount that would otherwise be available for Restricted Payments under
clause (C) of the first paragraph of this "Limitation on Restricted Payments"
covenant. The actions described in clauses (ii), (iii), (iv) and (ix) of the
immediately preceding paragraph will be Restricted Payments that will be
permitted in accordance with the immediately preceding paragraph and will not
reduce the amount that would otherwise be available for Restricted Payments
under clause (C) of the first paragraph of this "Limitation on Restricted
Payments" covenant.

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    LIMITATION ON DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING RESTRICTED
     SUBSIDIARIES.

    The CapRock indenture provides that CapRock will not, and will not permit
any Restricted Subsidiary to, directly or indirectly, create or otherwise cause
or suffer to exist or become effective any consensual encumbrance or restriction
of any kind on the ability of any Restricted Subsidiary to (i) pay dividends, in
cash or otherwise, or make any other distributions permitted by applicable law
on any Capital Stock or any other interest or participation in, or measured by,
its profits of such Restricted Subsidiary owned by CapRock or any other
Restricted Subsidiary, (ii) pay any Indebtedness owed to CapRock or any other
Restricted Subsidiary, (iii) make loans or advances to CapRock or any other
Restricted Subsidiary or (iv) transfer any of its property or assets to CapRock
or any other Restricted Subsidiary.

    The foregoing provisions shall not restrict any encumbrances or
restrictions:

    (i) existing on the Closing Date in the CapRock indenture or any other
agreements in effect on the Closing Date, and any extensions, refinancings,
renewals or replacements of such agreements; PROVIDED THAT the encumbrances and
restrictions in any such extensions, refinancings, renewals or replacements are
no less favorable in any material respect to the Holders than those encumbrances
or restrictions that are then in effect and that are being extended, refinanced,
renewed or replaced;

    (ii) existing under or by reason of applicable law;

    (iii) existing with respect to any Person or the property or assets of such
Person acquired by CapRock or any Restricted Subsidiary and existing at the time
of such acquisition and not incurred in contemplation thereof, which
encumbrances or restrictions are not applicable to any Person or the property or
assets of any Person other than such Person or the property or assets of such
Person so acquired;

    (iv) in the case of clause (iv) of the first paragraph of this "Limitation
on Dividend and Other Payment Restrictions Affecting Restricted Subsidiaries"
covenants, (A) that restrict in a customary manner the subletting, assignment or
transfer of any property or asset that is a lease, license, conveyance or
contract or similar property or asset, (B) existing by virtue of any transfer
of, agreement to transfer, option or right with respect to, or Lien on, any
property or assets of CapRock or any Restricted Subsidiary not otherwise
prohibited by the CapRock indenture or (C) arising or agreed to in the ordinary
course of business, not relating to any Indebtedness, and that do not,
individually or in the aggregate, detract from the value of property or assets
of CapRock or any Restricted Subsidiary in any manner material to CapRock or any
Restricted Subsidiary;

    (v) with respect to a Restricted Subsidiary and imposed pursuant to an
agreement that has been entered into for the sale or disposition of all or
substantially all of the Capital Stock of, or property and assets of, such
Restricted Subsidiary; or

    (vi) pursuant to (x) a Credit Facility, (y) a Vendor Credit Facility or (z)
any agreement which amends, extends, renews, refinances, replaces or refunds a
Credit Facility or Vendor Credit Facility; PROVIDED, however, that in the case
of subclauses (x), (y) and (z), the provisions of the Credit Facility or Vendor
Credit Facility (A) permit (whether explicitly or as a result of the relative
maturities of the Credit Facility, the Vendor Credit Facility and the CapRock
notes) distributions to CapRock for the purposes of, and in an amount sufficient
to fund, the payment of principal due at stated maturity and interest in respect
of the CapRock notes (PROVIDED, in either case, that such payment is due or to
become due within 30 days from the date of such distribution) at a time when
there does not exist an event which after notice or passage of time or both
would permit the lenders under the Credit Facility or Vendor Credit Facility to
declare all amounts thereunder due and payable, and (B) provide that in no event
shall any encumbrance or restriction pursuant to the Credit Facility or Vendor
Credit Facility prohibit distributions to CapRock for such purposes for more
than 180 days in any consecutive 360 day period, unless (1) there exists a
default under the Credit Facility or Vendor Credit Facility resulting

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from any payment default under the Credit Facility or Vendor Credit Facility or
(2) the maturity of the Credit Facility or Vendor Credit Facility has been
accelerated.

    Nothing contained in this "Limitation on Dividend and Other Payment
Restrictions Affecting Restricted Subsidiaries" covenant shall prevent CapRock
or any Restricted Subsidiary from (1) creating, incurring, assuming or suffering
to exist any Liens otherwise permitted by the "Limitation on Liens" covenant
described below or (2) restricting the sale or other disposition of property or
assets of CapRock or any of its Restricted Subsidiaries subject to such Liens.

    LIMITATION ON THE ISSUANCE AND SALE OF CAPITAL STOCK OF RESTRICTED
     SUBSIDIARIES.

    The CapRock indenture provides that CapRock will not sell, pledge,
hypothecate or otherwise convey or dispose of any Capital Stock of a Restricted
Subsidiary or permit any Restricted Subsidiary, directly or indirectly, to
issue, sell pledge, hypothecate or otherwise convey or dispose of, any shares of
Capital Stock of a Restricted Subsidiary (including options, warrants or other
rights to purchase shares of such Capital Stock) except:

    (i) to CapRock or a Wholly-Owned Restricted Subsidiary,

    (ii) issuances of director's qualifying shares or other issuances or sales
to the extent required by applicable law or regulation,

    (iii) issuances or sales of 100% of the Capital Stock of a Restricted
Subsidiary, PROVIDED THAT CapRock or such Restricted Subsidiary applies the Net
Cash Proceeds, if any, of any such sale pursuant to this clause (iii) in
accordance with clause (A) or (B) of the "Limitation on Asset Sales" covenant
described below,

    (iv) issuances or sales in a transaction if, immediately after giving effect
thereto, such Restricted Subsidiary would no longer be a Restricted Subsidiary
if (A) such transaction does not violate the "Limitation on Asset Sales"
covenant and (B) any Investment in such Person remaining after giving effect to
such transaction would not violate the "Limitation on Restricted Payments"
covenant if made at the date of such issuance or sale,

    (v) pursuant to a Credit Facility or a Vendor Credit Facility,

    (vi) issuances or sales of Redeemable Stock in exchange for, or upon
conversion of, or the proceeds from the issuance or sale of which are used to
refinance, shares of Redeemable Stock of such Restricted Subsidiary if the
amounts payable with respect to the redemption of such newly issued or sold
Redeemable Stock do not exceed the amount payable with respect to the redemption
of the Redeemable Stock being exchanged, converted or refinanced and such newly
issued or sold Redeemable Stock does not require any redemption earlier than the
date on which the Redeemable Stock being exchanged, converted or refinanced
required a redemption,

    (vii) issuances or sales of Redeemable Stock (other than Redeemable Stock
convertible into or exchangeable for Common Stock of any Restricted Subsidiary)
that does not otherwise violate the provisions of the CapRock indenture, or

    (viii) in the Transaction or the Special Partnership Transaction.

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    LIMITATION ON ISSUANCES OF GUARANTEES BY RESTRICTED SUBSIDIARIES.

    The CapRock indenture provides that CapRock will not permit any Restricted
Subsidiary, directly or indirectly, to Guarantee any Indebtedness of CapRock
which is PARI PASSU in right of payment with, or subordinate in right of payment
to, the CapRock notes ("Guaranteed Indebtedness"), unless:

    (i) such Restricted Subsidiary simultaneously executes and delivers a
supplemental indenture to the CapRock indenture providing for a Guarantee (a
"Subsidiary Guarantee") of payment of the CapRock notes by such Restricted
Subsidiary and

    (ii) such Restricted Subsidiary waives, and will not in any manner
whatsoever claim or take the benefit or advantage of, any rights of
reimbursement, indemnity or subrogation or any other rights against CapRock or
any other Restricted Subsidiary as a result of any payment by such Restricted
Subsidiary under its Subsidiary Guarantee;

PROVIDED THAT this paragraph shall not be applicable to (x) any Guarantee of any
Restricted Subsidiary that existed at the time such Person became a Restricted
Subsidiary and was not Incurred in connection with, or in contemplation of, such
Person becoming a Restricted Subsidiary or (y) any Guarantee of any Restricted
Subsidiary of Indebtedness Incurred under Credit Facilities or Vendor Credit
Facilities pursuant to clause (ix) of the definition of "Permitted
Indebtedness". If the Guaranteed Indebtedness is (A) PARI PASSU in right of
payment with the CapRock notes, then the Guarantee of such Guaranteed
Indebtedness shall be PARI PASSU in right of payment with, or subordinated in
right of payment to, the Subsidiary Guarantee or (B) subordinated in right of
payment to the CapRock notes, then the Guarantee of such Guaranteed Indebtedness
shall be subordinated in right of payment to the Subsidiary Guarantee at least
to the extent that the Guaranteed Indebtedness is subordinated in right of
payment to the CapRock notes.

    Notwithstanding the foregoing, any Subsidiary Guarantee by a Restricted
Subsidiary may provide by its terms that it shall be automatically and
unconditionally released and discharged upon (i) any sale, exchange or transfer,
to any Person not an Affiliate of CapRock, of all of CapRock's and each
Restricted Subsidiary's Capital Stock in, or all or substantially all the assets
of, such Restricted Subsidiary (which sale, exchange or transfer is not
prohibited by the CapRock indenture) or (ii) the release or discharge of the
Guarantee which resulted in the creation of such Subsidiary Guarantee, except a
discharge or release by or as a result of payment under such Guarantee.

    LIMITATION ON TRANSACTIONS WITH STOCKHOLDERS AND AFFILIATES.

    The CapRock indenture provides that CapRock will not, and will not permit
any Restricted Subsidiary to, directly or indirectly, enter into, renew or
extend any transaction (including, without limitation, the purchase, sale, lease
or exchange of property or assets, or the rendering of any service) with any
holder (or any Affiliate of such holder) of 5% or more of any class of Capital
Stock of CapRock or with any Affiliate of CapRock or any Restricted Subsidiary,
except (a) in writing (other than the payment of salaries or bonuses to officers
of CapRock or any Restricted Subsidiary in the ordinary course of business which
need not be in writing) upon fair and reasonable terms no less favorable in any
material respect to CapRock or such Restricted Subsidiary than could be
obtained, at the time of the execution of the agreement providing therefor, in a
comparable arm's-length transaction with a Person that is not such a holder or
an Affiliate, (b) with respect to any transaction or series of related
transactions involving an aggregate value in excess of $5 million, if CapRock
delivers an Officers' Certificate to the trustee certifying that such
transaction or series of related transactions complies with clause (a) above,
and (c) with respect to any transaction or series of related transactions
involving an aggregate value in excess of $10 million, if either (1) such
transaction or series of related transactions has been approved by a majority of
the Disinterested Directors of CapRock, or in the event there is only one
Disinterested Director, by such Disinterested Director, or (2) CapRock delivers
to the trustee a written opinion of an investment banking firm of national
standing or other recognized

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independent expert with experience appraising the terms and conditions of the
type of transaction or series of related transactions for which an opinion is
required stating that the transaction or series of related transactions is fair
to CapRock or such Subsidiary from a financial point of view.

    The foregoing limitation does not limit, and shall not apply to:

    (i) any transaction solely between CapRock and any of its Wholly-Owned
Restricted Subsidiaries or solely between Wholly-Owned Restricted Subsidiaries;

    (ii) the payment of reasonable and customary regular fees to directors of
CapRock who are not employees of CapRock;

    (iii) any payments or other transactions pursuant to any tax-sharing
agreement between CapRock and any other Person with which CapRock files a
consolidated tax return or with which CapRock is part of a consolidated group
for tax purposes;

    (iv) any Restricted Payments not prohibited by the "Limitation on Restricted
Payments" covenant;

    (v) the Transaction or the Special Partnership Transaction; or

    (vi) any transaction or agreement as described in the offering memorandum
pursuant to which the CapRock notes were initially offered and as in effect as
of July 10, 1998.

    LIMITATION ON LIENS.

    The CapRock indenture provides that CapRock will not, and will not permit
any Restricted Subsidiary to, directly or indirectly, create, incur, assume or
suffer to exist any Lien on any of its assets or properties of any character, or
any shares of Capital Stock or Indebtedness of any Restricted Subsidiary,
without making effective provision for all of the CapRock notes and all other
amounts due under the CapRock indenture to be directly secured equally and
ratably with (or, if the obligation or liability to be secured by such Lien is
subordinated in right of payment to the CapRock notes, prior to) the obligation
or liability secured by such Lien. The foregoing limitation does not apply to
Permitted Liens.

    LIMITATION ON SALE-LEASEBACK TRANSACTIONS.

    The CapRock indenture provides that CapRock will not, and will not permit
any Restricted Subsidiary to, enter into any sale-leaseback transaction
involving any of its assets or properties, whether now owned or hereafter
acquired, whereby CapRock or a Restricted Subsidiary sells or transfers such
assets or properties and then or thereafter leases such assets or properties or
any part thereof or any other assets or properties which CapRock or such
Restricted Subsidiary, as the case may be, intends to use for substantially the
same purpose or purposes as the assets or properties sold or transferred.

    The foregoing restriction does not apply to any sale-leaseback transaction
if

    (i) the lease is for a period, including renewal rights, of not in excess of
three years;

    (ii) the lease secures or relates to industrial revenue or pollution control
bonds;

    (iii) the transaction is solely between CapRock and any Wholly-Owned
Restricted Subsidiary or solely between Wholly-Owned Restricted Subsidiaries; or

    (iv) CapRock or such Restricted Subsidiary, within 12 months after the sale
or transfer of any assets or properties is completed, applies an amount not less
than the net proceeds received from such sale in accordance with clause (A) or
(B) of the first paragraph of the "Limitation on Asset Sales" covenant described
below.

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    LIMITATION ON ASSET SALES.

    The CapRock indenture provides that CapRock will not, and will not permit
any Restricted Subsidiary to, consummate any Asset Sale, unless (i) the
consideration received by CapRock or such Restricted Subsidiary is at least
equal to the fair market value of the assets sold or disposed of and (ii) at
least 75% of the consideration received consists of cash or Temporary Cash
Investments (with the amount of Indebtedness and liabilities of CapRock or a
Restricted Subsidiary that are unconditionally assumed by the transferee being
deemed to be cash for purposes of this covenant). In the event and to the extent
that the Net Cash Proceeds received by CapRock or any of its Restricted
Subsidiaries from one or more Asset Sales occurring on or after the Closing Date
in any period of 12 consecutive months exceed the greater of $10 million and 10%
of Adjusted Consolidated Net Tangible Assets (determined as of the date closest
to the commencement of such 12-month period for which a consolidated balance
sheet of CapRock and its Subsidiaries has been filed with the SEC or provided to
the trustee pursuant to the "SEC Reports and Reports to Holders" covenant (or,
if such determination date is prior to the date of the consummation of the
Transaction or Special Partnership Transaction, then the balance sheet of
CapRock as of such date shall be adjusted to give pro forma effect to the
Transaction or Special Partnership Transaction, as the case may be, as if such
transaction had occurred on such determination date, together with an Officers'
Certificate certifying that such balance sheet has been prepared in accordance
with GAAP and is true and correct in all material respects)), then CapRock shall
or shall cause the relevant Restricted Subsidiary to (i) within 12 months after
the date Net Cash Proceeds so received exceed the greater of $10 million and 10%
of Adjusted Consolidated Net Tangible Assets (A) apply an amount equal to such
excess Net Cash Proceeds to permanently repay unsubordinated Indebtedness of
CapRock or any Restricted Subsidiary providing a Subsidiary Guarantee pursuant
to the "Limitation on Issuances of Guarantees by Restricted Subsidiaries"
covenant described above or Indebtedness of any other Restricted Subsidiary, in
each case owing to a Person other than CapRock or any of its Subsidiaries, or
(B) invest an amount equal to such excess Net Cash Proceeds, or the amount of
such Net Cash Proceeds not so applied pursuant to clause (A) (or enter into a
definitive agreement committing to so invest within 12 months after the date of
such agreement), in Telecommunications Assets and (ii) apply (no later than the
end of the 12-month period referred to in clause (i)) such excess Net Cash
Proceeds (to the extent not applied pursuant to clause (i)) as provided in the
following paragraph of this "Limitation on Asset Sales" covenant. The amount of
such excess Net Cash Proceeds required to be applied (or to be committed to be
applied) during such 12-month period as set forth in clause (i) of the preceding
sentence and not applied as so required by the end of such period shall
constitute "Excess Proceeds." Pending the final application of any such Net Cash
Proceeds, CapRock or such Restricted Subsidiary may invest such funds in
Temporary Cash Investments or temporarily reduce revolving Indebtedness under
any Credit Facility or any Vendor Credit Facility.

    If, as of the first day of any calendar month, the aggregate amount of
Excess Proceeds not theretofore subject to an Offer to Purchase pursuant to this
"Limitation on Asset Sales" covenant totals at least $10 million, CapRock must
commence, not later than the fifteenth Business Day of such month, and
consummate an Offer to Purchase from the Holders on a pro rata basis an
aggregate principal amount of CapRock notes equal to the Excess Proceeds on such
date, at a purchase price equal to 100% of the principal amount of the CapRock
notes plus, in each case, accrued interest to the Payment Date. To the extent
that the aggregate purchase price for the CapRock notes tendered pursuant to an
Offer to Purchase is less than the Excess Proceeds, CapRock or any Restricted
Subsidiary may use such deficiency for general corporate purposes. Upon
completion of such Offer to Purchase, the amount of Excess Proceeds shall be
reset to zero.

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    SEC REPORTS AND REPORTS TO HOLDERS.

    Whether or not CapRock is then required to file reports with the SEC,
CapRock shall file with the SEC all such reports and other information as it
would be required to file with the SEC by Section 13(a) or 15(d) under the
Securities Exchange Act if it were subject thereto. CapRock shall supply the
trustee and each Holder or shall supply to the trustee for forwarding to each
such Holder, without cost to such Holder, copies of such reports and other
information; PROVIDED, however, that the copies of such reports and information
mailed to Holders need not contain the exhibits thereto, but CapRock agrees to
furnish any such exhibits to any Holder upon written request therefor.

REPURCHASE OF CAPROCK NOTES UPON A CHANGE OF CONTROL

    If a Change of Control shall occur at any time, each Holder shall have the
right to require that CapRock purchase all such Holder's CapRock notes in whole
or in part in integral multiples of $1,000, at a purchase price equal to 101% of
the principal amount thereof, plus accrued and unpaid interest to the Payment
Date. CapRock shall commence such Offer to Purchase within 30 days following the
occurrence of such Change of Control.

    There can be no assurance that CapRock will have sufficient funds available
at the time of any Change of Control to make any debt payment (including
repurchases of CapRock notes) required by the foregoing covenant (as well as may
be contained in other securities of CapRock which might be outstanding at the
time). The foregoing covenant requiring CapRock to repurchase the CapRock notes
will, unless consents are obtained, require CapRock to repay all indebtedness
then outstanding which by its terms would prohibit such CapRock note repurchase,
either prior to or concurrently with such CapRock note repurchase.

EVENTS OF DEFAULT

    The following events are defined as "Events of Default" in the CapRock
indenture:

    (a) defaults in the payment of principal of (or premium, if any, on) any
CapRock note when the same becomes due and payable at maturity, upon
acceleration, redemption or otherwise;

    (b) defaults in the payment of interest on any CapRock note when the same
becomes due and payable, which defaults continue for a period of 30 days;

    (c) defaults in the performance or breach of the provisions of the CapRock
indenture applicable to mergers, consolidations and transfers of all or
substantially all of the assets of CapRock or mandatory redemption, or the
failure to make or consummate an Offer to Purchase in accordance with the
"Limitation on Asset Sales" or the "Repurchase of CapRock Notes Upon a Change of
Control" covenants described above;

    (d) defaults in the performance or breach of any covenant or agreement of
CapRock in the CapRock indenture or under the CapRock notes (other than a
default specified in clause (a), (b) or (c) above), which default or breach
continues (i) for a period of 30 consecutive days or (ii) in the event such
default or breach cannot be cured in such 30-day period and CapRock is
diligently and in good faith attempting to cure such default or breach, for a
period of 60 consecutive days in the case of both clauses (i) and (ii), after
written notice by the trustee or the Holders of at least 25% in aggregate
principal amount of the CapRock notes then outstanding;

    (e) there occurs with respect to any issue or issues of Indebtedness of
CapRock or any Restricted Subsidiary having an outstanding principal amount of
$7.5 million or more in the aggregate for all such issues of all such Persons,
whether such Indebtedness now exists or shall hereafter be created, (I) an event
of default that has caused the holder thereof to declare such Indebtedness to be
due and payable prior to its Stated Maturity and such Indebtedness has not been
discharged in full or such acceleration

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has not been rescinded or annulled within 30 days of such acceleration and/or
(II) the failure to make a principal payment at the final (but not any interim)
fixed maturity and such defaulted payment shall not have been made, waived or
extended within 30 days of such payment default;

    (f) any final judgment or order (not covered by insurance) for the payment
of money in excess of $7.5 million in the aggregate for all such final judgments
or orders against all such Persons (treating any deductibles, self-insurance or
retention as not so covered) shall be rendered against CapRock or any Restricted
Subsidiary and shall not be paid or discharged, and there shall be any period of
30 consecutive days following entry of the final judgment or order that causes
the aggregate amount for all such final judgments or orders outstanding and not
paid or discharged against all such Persons to exceed $7.5 million during which
a stay of enforcement of such final judgment or order, by reason of a pending
appeal or otherwise, shall not be in effect;

    (g) a court having jurisdiction in the premises enters a decree or order for
(A) relief in respect of CapRock or any Restricted Subsidiary in an involuntary
case under any applicable bankruptcy, insolvency or other similar law now or
hereafter in effect, (B) appointment of a receiver, liquidator, assignee,
custodian, trustee, sequestrator or similar official of CapRock or any
Restricted Subsidiary or for all or substantially all of the property and assets
of CapRock or any Restricted Subsidiary or (C) the winding up or liquidation of
the affairs of CapRock or any Restricted Subsidiary and, in each case, such
decree or order shall remain unstayed and in effect for a period of 60
consecutive days;

    (h) CapRock or any Restricted Subsidiary (A) commences a voluntary case
under any applicable bankruptcy, insolvency or other similar law now or
hereafter in effect, or consents to the entry of an order for relief in an
involuntary case under any such law, (B) consents to the appointment of or
taking possession by a receiver, liquidator, assignee, custodian, trustee,
sequestrator or similar official of CapRock or any Restricted Subsidiary or for
all or substantially all of the property and assets of CapRock or any Restricted
Subsidiary or (C) effects any general assignment for the benefit of creditors;

    (i) there occurs a default by CapRock or IWL Communications, Incorporated
under the Escrow Agreement or the Escrow Agreement shall cease to be in full
force and effect or enforceable in accordance with its terms, other than in
accordance with its terms or prior to the termination of such agreement, the
lien of the trustee under such agreement ceases to be a first priority perfected
security interest in any portion of the collateral purported to be pledged
thereunder.

    If an Event of Default (other than an Event of Default specified in clause
(g) or (h) above that occurs with respect to CapRock) occurs and is continuing
under the CapRock indenture, the trustee or the Holders of at least 25% in
aggregate principal amount of the CapRock notes then outstanding, by written
notice to CapRock (and to the trustee if such notice is given by the Holders),
may, and the trustee at the request of such Holders shall, declare the principal
of, premium, if any, and accrued interest on the CapRock notes to be immediately
due and payable. Upon a declaration of acceleration, such principal, premium, if
any, and accrued interest shall be immediately due and payable. In the event of
a declaration of acceleration because an Event of Default set forth in clause
(e) above has occurred and is continuing, such declaration of acceleration shall
be automatically rescinded and annulled if the event of default triggering such
Event of Default pursuant to clause (e) shall be remedied or cured by CapRock or
the relevant Restricted Subsidiary or waived by the holders of the relevant
Indebtedness within 60 days after the declaration of acceleration with respect
thereto. If an Event of Default specified in clause (g) or (h) above occurs with
respect to CapRock, the principal of, premium, if any, and accrued interest on
the CapRock notes then outstanding shall ipso facto become and be immediately
due and payable without any declaration or other act on the part of the trustee
or any Holder. The Holders of at least a majority in principal amount of the
outstanding CapRock notes, by written notice to CapRock and to the trustee, may
waive all past defaults and their consequences including the acceleration of the
CapRock notes if (i) all existing Events of Default, other than the

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nonpayment of the principal of, premium, if any, and interest on the CapRock
notes that have become due solely by such acceleration, have been cured or
waived and (ii) the rescission would not conflict with any judgment or decree of
a court of competent jurisdiction. For information as to the waiver of defaults,
see "--Modification and Waiver."

    The Holders of at least a majority in aggregate principal amount of the
outstanding CapRock notes may direct the time, method and place of conducting
any proceeding for any remedy available to the trustee or exercising any trust
or power conferred on the trustee. however, the trustee may refuse to follow any
direction that conflicts with law or the CapRock indenture that may involve the
trustee in personal liability, or that the trustee determines in good faith may
be unduly prejudicial to the rights of Holders of CapRock notes not joining in
the giving of such direction, and may take any other action it deems proper that
is not inconsistent with any such direction received from Holders of CapRock
notes. A Holder may not pursue any remedy with respect to the CapRock indenture
or the CapRock notes unless:

    (i) the Holder gives the trustee written notice of a continuing Event of
Default;

    (ii) the Holders of at least 25% in aggregate principal amount of
outstanding CapRock notes make a written request to the trustee to pursue the
remedy;

    (iii) such Holders offer the trustee indemnity satisfactory to the trustee
against any costs, liability or expense;

    (iv) the trustee does not comply with the request within 60 days after
receipt of the request and the offer of indemnity; and

    (v) during such 60-day period, the Holders of a majority in aggregate
principal amount of the outstanding CapRock notes do not give the trustee a
direction that is inconsistent with the request. However, such limitations do
not apply to the right of any Holder of a CapRock note to receive payment of the
principal of, premium, if any, or (subject to certain provisions of the CapRock
indenture) interest on, such CapRock note or to bring suit for the enforcement
of any such payment, on or after the due date expressed in the CapRock notes,
which right shall not be impaired without the consent of the Holder.

    The CapRock indenture requires certain officers of CapRock to certify, on or
before a date not more than 90 days after the end of each fiscal year, that a
review has been conducted of the activities of CapRock and its Restricted
Subsidiaries and the performance of CapRock and its Restricted Subsidiaries
under the CapRock indenture and that CapRock has fulfilled all obligations
thereunder, or, if there has been a default in the fulfillment of any such
obligation, specifying each such default and the nature and status thereof.
CapRock also is obligated to notify the trustee of any default or defaults in
the performance of any covenants or agreements under the CapRock indenture.

CONSOLIDATION, MERGER AND SALE OF ASSETS

    The CapRock indenture provides that CapRock shall not consolidate with,
merge with or into, or sell, convey, transfer, lease or otherwise dispose of all
or substantially all of its property and assets (as an entirety or substantially
an entirety in one transaction or a series of related transactions) to, any
Person or permit any Person to merge with or into CapRock, other than in
connection with the Transaction or the Special Partnership Transaction, unless:

    (i) CapRock shall be the continuing Person, or the Person (if other than
CapRock) formed by such consolidation or into which CapRock is merged or that
acquired or leased such property and assets of CapRock shall be a corporation
organized and validly existing under the laws of the United States of America or
any jurisdiction thereof, and shall expressly assume, by a supplemental
indenture,

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executed and delivered to the trustee, all of the obligations of CapRock on all
of the CapRock notes and under the CapRock indenture;

    (ii) immediately after giving effect to such transaction, no Default or
Event of Default shall have occurred and be continuing;

    (iii) immediately after giving effect to such transaction on a pro forma
basis, CapRock, or any Person becoming the successor obligor of the CapRock
notes, as the case may be, could Incur at least $1.00 of Indebtedness under
clause (i) of the first paragraph of the "Limitation on Indebtedness" covenant
described above; PROVIDED, however, that this clause (iii) shall not apply to a
consolidation or merger with or into a Wholly-Owned Restricted Subsidiary with a
positive net worth, PROVIDED THAT in connection with any such merger or
consolidation, no consideration (except Capital Stock (other than Redeemable
Stock) in the surviving Person or CapRock (or a Person that owns directly or
indirectly all of the Capital Stock of the surviving Person or CapRock
immediately following such transaction) or cash paid to satisfy dissenter or
appraisal rights; PROVIDED THAT such rights are exercised with respect to no
more than 5% of the outstanding Capital Stock of CapRock or other Person) shall
be issued or distributed to the stockholders of CapRock; and

    (iv) CapRock delivers to the trustee an Officers' Certificate (attaching the
arithmetic computations to demonstrate compliance with clause (iii) above) and
an Opinion of Counsel, in each case stating that such consolidation, merger or
transfer and such supplemental indenture comply with this provision and that all
conditions precedent provided for herein relating to such transaction have been
complied with; PROVIDED, however, that clauses (ii) and (iii) above do not apply
if, in the good faith determination of the Board of Directors of CapRock, whose
determination shall be evidenced by a Board Resolution, the principal purpose of
such transaction is to change the state of incorporation of CapRock; and
PROVIDED FURTHER that any such transaction shall not have as one of its purposes
the evasion of the foregoing limitations.

DEFEASANCE

    DEFEASANCE AND DISCHARGE.

    The CapRock indenture provides that CapRock will be deemed to have paid and
will be discharged from any and all obligations in respect of the CapRock notes
on the 123rd day after the deposit referred to below, and the provisions of the
CapRock indenture will no longer be in effect with respect to the CapRock notes
(except for, among other matters, certain obligations to register the transfer
or exchange of the CapRock notes, to replace stolen, lost or mutilated CapRock
notes, to maintain paying agencies and to hold monies for payment in trust) if,
among other things, (A) CapRock has deposited with the trustee, in trust, money
and/or U.S. Government Obligations that through the payment of interest and
principal in respect thereof in accordance with their terms will provide money
in an amount sufficient to pay the principal of, premium, if any, and accrued
interest on the CapRock notes on the Stated Maturity of such payments in
accordance with the terms of the CapRock indenture and the CapRock notes,
(B) CapRock has delivered to the trustee (i) either (x) an Opinion of Counsel to
the effect that Holders will not recognize income, gain or loss for federal
income tax purposes as a result of CapRock's exercise of its option under this
"Defeasance" provision and will be subject to federal income tax on the same
amount and in the same manner and at the same times as would have been the case
if such deposit, defeasance and discharge had not occurred, which Opinion of
Counsel must be based upon (and accompanied by a copy of) a ruling of the
Internal Revenue Service to the same effect unless there has been a change in
applicable federal income tax law after the Closing Date such that a ruling is
no longer required or (y) a ruling directed to the trustee received from the
Internal Revenue Service to the same effect as the aforementioned Opinion of
Counsel and (ii) an Opinion of Counsel to the effect that the creation of the
defeasance trust does not violate the Investment Company Act of 1940 and after
the passage of 123 days (or, under certain

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circumstances, one year) following the deposit, the trust fund will not be
subject to the effect of Section 547 of the United States Bankruptcy Code or
Section 15 of the New York Debtor and Creditor Law, (C) immediately after giving
effect to such deposit on a pro forma basis, no Event of Default, or event that
after the giving of notice or lapse of time or both would become an Event of
Default, shall have occurred and be continuing on the date of such deposit or
during the period ending on the 123rd day after the date of such deposit, and
such deposit shall not result in a breach or violation of, or constitute a
default under, any other agreement or instrument to which CapRock or any of its
Subsidiaries is a party or by which CapRock or any of its Subsidiaries is bound,
and (D) if at such time the CapRock notes are listed on a national securities
exchange, CapRock has delivered to the trustee an Opinion of Counsel to the
effect that the CapRock notes will not be delisted as a result of such deposit,
defeasance and discharge.

    DEFEASANCE OF CERTAIN COVENANTS AND CERTAIN EVENTS OF DEFAULT.

    The CapRock indenture further provides that the provisions of the CapRock
indenture will no longer be in effect with respect to clauses (iii) and
(iv) under "Consolidation, Merger and Sale of Assets" and all the covenants
described herein under "Certain Covenants," clause (d) under "Events of Default"
with respect to such covenants and clauses (iii) and (iv) under "Consolidation,
Merger and Sale of Assets," and that clauses (e) and (f) under "Events of
Default" shall be deemed not to be Events of Default, upon, among other things,
the deposit with the trustee, in trust, of money and/or U.S. Government
Obligations that through the payment of interest and principal in respect
thereof in accordance with their terms will provide money in an amount
sufficient to pay the principal of, premium, if any, and accrued interest on the
CapRock notes on the Stated Maturity of such payments in accordance with the
terms of the CapRock indenture and the CapRock notes, the satisfaction of the
provisions described in clauses (B)(ii), (C) and (D) of the preceding paragraph
and the delivery by CapRock to the trustee of an Opinion of Counsel to the
effect that, among other things, the Holders will not recognize income, gain or
loss for federal income tax purposes as a result of such deposit and defeasance
of certain covenants and Events of Default and will be subject to federal income
tax on the same amount and in the same manner and at the same times as would
have been the case if such deposit and defeasance had not occurred.

    DEFEASANCE AND CERTAIN OTHER EVENTS OF DEFAULT.

    In the event CapRock exercises its option to omit compliance with certain
covenants and provisions of the CapRock indenture with respect to the CapRock
notes as described in the immediately preceding paragraph and the CapRock notes
are declared due and payable because of the occurrence of an Event of Default
that remains applicable, the amount of money and/or U.S. Government Obligations
on deposit with the trustee will be sufficient to pay amounts due on the CapRock
notes at the time of their Stated Maturity but may not be sufficient to pay
amounts due on the CapRock notes at the time of the acceleration resulting from
such Event of Default. However, CapRock will remain liable for such payments.

MODIFICATION AND WAIVER

    From time to time, CapRock and the trustee, without the consent of the
Holders, may amend, waive or supplement the CapRock indenture, the CapRock
notes, the Merger Agreement and the Escrow Agreement for certain specified
purposes, including, among other things, curing ambiguities, defects or
inconsistencies, to provide for the assumption of CapRock's obligations to
Holders in the case of a merger or consolidation, to make any change that would
provide any additional rights or benefits to the Holders, to add guarantors with
respect to the CapRock notes, to secure the CapRock notes, to maintain the
qualification of the CapRock indenture under the Trust Indenture Act or to make
any change that does not adversely affect the rights of any Holder. Other
amendments and

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modifications of the CapRock indenture or the CapRock notes issued thereunder,
the Merger Agreement or the Escrow Agreement may be made by CapRock and the
trustee with the consent of the Holders of not less than a majority in aggregate
principal amount of the outstanding CapRock notes; PROVIDED, however, that no
such modification or amendment may, without the consent of each Holder affected
thereby:

    (i) change the Stated Maturity of the principal of, or any installment of
interest on, any CapRock note,

    (ii) reduce the principal of, or premium, if any, or interest on, any
CapRock note,

    (iii) change the place or currency of payment of principal of, or premium,
if any, or interest on, any CapRock note,

    (iv) impair the right to institute suit for the enforcement of any payment
on or after the Stated Maturity (or, in the case of a redemption, on or after
the Redemption Date) of any CapRock note,

    (v) reduce the above-stated percentage of outstanding CapRock notes the
consent of whose Holders is necessary to modify or amend the CapRock indenture,

    (vi) waive a default in the payment of principal of, premium, if any, or
interest on the CapRock notes,

    (vii) reduce the percentage or aggregate principal amount of outstanding
CapRock notes the consent of whose Holders is necessary for waiver of compliance
with certain provisions of the CapRock indenture or for waiver of certain
defaults,

    (viii) release any lien created by the Escrow Agreement, except in
accordance with the terms thereof, or

    (ix) amend, change or otherwise modify the obligation of CapRock to make and
consummate the Special Offer to Purchase contemplated by the covenant entitled
"Special Offer to Purchase."

GOVERNING LAW

    The CapRock indenture and the CapRock notes are governed by and will be
construed in accordance with the laws of the State of New York without giving
effect to principles of conflicts of law.

CONCERNING THE TRUSTEE

    The CapRock indenture provides that, except during the continuance of a
Default, the trustee will not be liable, except for the performance of such
duties as are specifically set forth in such CapRock indenture. If an Event of
Default has occurred and is continuing, the trustee will use the same degree of
care and skill in its exercise as a prudent person would exercise under the
circumstances in the conduct of such person's own affairs.

    The CapRock indenture and provisions of the Trust Indenture Act incorporated
by reference therein contain limitations on the rights of the trustee, should it
become a creditor of CapRock, to obtain payment of claims in certain cases or to
realize on certain property received by it in respect of any such claims, as
security or otherwise. The trustee is permitted to engage in other transactions;
PROVIDED, however, that if it acquires any conflicting interest, it must
eliminate such conflict or resign.

    The Trustee shall act as registrar and paying agent for the CapRock notes.

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CERTAIN DEFINITIONS

    Set forth below is a summary of certain of the defined terms used in the
covenants and other provisions of the CapRock indenture. Reference is made to
the CapRock indenture for the definition of any other capitalized term used
herein for which no definition is provided.

    "Acquired Indebtedness" means Indebtedness of a Person existing at the time
such Person becomes a Restricted Subsidiary or assumed in connection with an
Asset Acquisition by CapRock or a Restricted Subsidiary; PROVIDED THAT
Indebtedness of such Person which is redeemed, defeased, retired or otherwise
repaid at the time of or immediately upon consummation of the transaction by
which such Person becomes a Restricted Subsidiary or such Asset Acquisition
shall not be Acquired Indebtedness.

    "Adjusted Consolidated Net Income" means, for any period, the aggregate net
income (or loss) of CapRock and its Restricted Subsidiaries for such period
(which calculation shall include the combined aggregate consolidated net income
(or loss) of CapRock Telecommunications Corp., CapRock Fiber Network, LTD. and
IWL Communications, Incorporated and their respective Restricted Subsidiaries
during the Transition Period in the event the Transaction is consummated)
determined in conformity with GAAP; PROVIDED THAT the following items shall be
excluded in computing Adjusted Consolidated Net Income (without duplication):

    (i) the net income (or loss) of any Person (other than a Restricted
Subsidiary) in which any Person (other than CapRock or any of its Restricted
Subsidiaries) has a joint interest and the net income (or loss) of any
Unrestricted Subsidiary, except

        (x) with respect to net income, to the extent of the amount of dividends
    or other distributions actually paid in cash to CapRock or any of its
    Restricted Subsidiaries by such other Person or such Unrestricted Subsidiary
    during such period and

        (y) with respect to net losses, to the extent of the amount of cash
    contributed by CapRock or any Restricted Subsidiary to such Person during
    such period;

    (ii) the net income (or loss) of any Person acquired by CapRock or any of
its Restricted Subsidiaries in a pooling-of-interests transaction for any period
prior to the date of the related acquisition;

    (iii) the net income of any Restricted Subsidiary to the extent that the
declaration or payment of dividends or similar distributions by such Restricted
Subsidiary of such net income is not at the time permitted by the operation of
the terms of its charter or any agreement, instrument, judgment, decree, order,
statute, rule or governmental regulation applicable to such Restricted
Subsidiary;

    (iv) any gains or losses (on an after-tax basis) attributable to Asset
Sales;

    (v) any net after-tax extraordinary or non-recurring gains or losses;

    (vi) any gain or loss, net of taxes, realized upon the termination of any
employee benefit plan; and

    (vii) any compensation or other expense paid or payable solely with Capital
Stock (other than Redeemable Stock) of CapRock or any options, warrants or other
rights to acquire such Capital Stock.

    "Adjusted Consolidated Net Tangible Assets" means the total amount of assets
of CapRock and its Restricted Subsidiaries (less applicable depreciation,
amortization and other valuation reserves), except to the extent resulting from
write-ups of capital assets (excluding write-ups in connection with accounting
for acquisitions in conformity with GAAP), minus (i) all current liabilities of
CapRock and its Restricted Subsidiaries (excluding intercompany items) and (ii)
all goodwill, trade names, trademarks, patents, unamortized debt discount and
expense and other like intangibles, all as set forth on the most recent
quarterly or annual consolidated balance sheet of CapRock and its Restricted
Subsidiaries, prepared in conformity with GAAP and filed with the SEC or
provided to the trustee pursuant to the "SEC Reports and Reports to Holders"
covenant described above.

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    "Affiliate" means, with respect to any specified Person, any other Person
directly or indirectly controlling or controlled by or under direct or indirect
common control with such specified Person. For the purposes of this definition,
"control," when used with respect to any specified Person, means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

    "Asset Acquisition" means (i) an investment by CapRock or any of its
Restricted Subsidiaries in any other Person pursuant to which such Person shall
become a Restricted Subsidiary or shall be merged into or consolidated with
CapRock or any of its Restricted Subsidiaries; PROVIDED THAT such Person's
primary business is related, ancillary or complementary to the businesses of
CapRock and its Restricted Subsidiaries on the date of such investment or (ii)
an acquisition by CapRock or any of its Restricted Subsidiaries of the property
and assets of any Person other than CapRock or any of its Restricted
Subsidiaries that constitute substantially all of a division or line of business
of such Person; PROVIDED THAT the property and assets acquired are related,
ancillary or complementary to the businesses of CapRock and its Restricted
Subsidiaries on the date of such acquisition. The term does not include the
Transaction or the Special Partnership Transaction.

    "Asset Disposition" means the sale or other disposition by CapRock or any of
its Restricted Subsidiaries (other than to CapRock or another Restricted
Subsidiary) of (i) all or substantially all of the Capital Stock of any
Restricted Subsidiary or (ii) all or substantially all of the assets of a
division or line of business of CapRock or any of its Restricted Subsidiaries.
The term does not include the Transaction or the Special Partnership
Transaction.

    "Asset Sale" means any direct or indirect sale, transfer or lease or other
disposition (including by way of merger, consolidation or sale-leaseback
transaction) in one transaction or a series of related transactions by CapRock
or any of its Restricted Subsidiaries to any Person other than CapRock or any of
its Restricted Subsidiaries of:

    (i) all or any of the Capital Stock of any Restricted Subsidiary,

    (ii) all or substantially all of the property and assets of an operating
unit or business of CapRock or any of its Restricted Subsidiaries or

    (iii) any other property and assets of CapRock or any of its Restricted
Subsidiaries outside the ordinary course of business of CapRock or such
Restricted Subsidiary other than the Capital Stock of or Investment in an
Unrestricted Subsidiary

that, with respect to each of (i), (ii) and (iii), is not governed by the
provisions of the CapRock indenture applicable to mergers, consolidations and
sales of all or substantially all of the assets of CapRock; PROVIDED THAT "Asset
Sale" shall not include:

    (a) sales, transfers or other dispositions of assets, whether in one
transaction or a series of related transactions occurring within one year,
involving assets with a fair market value not in excess of $1.0 million in any
transaction or series of related transactions,

    (b) contemporaneous exchanges by CapRock or any Restricted Subsidiary of
Telecommunications Assets for other Telecommunications Assets in the ordinary
course of business, including fiber swaps and partitioning of switches; PROVIDED
THAT the applicable Telecommunications Assets received by CapRock or such
Restricted Subsidiary have at least substantially equal fair market value to the
Telecommunications Assets disposed of,

    (c) sales, transfers or other dispositions of assets that have become
uneconomic, obsolete or worn-out, or

    (d) the Transaction or the Special Partnership Transaction.

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    "Average Life" means, at any date of determination with respect to any debt
security, the quotient obtained by dividing (i) the sum of the products of
(a) the number of years from such date of determination to the dates of each
successive scheduled principal payment of such debt security and (b) the amount
of such principal payment by (ii) the sum of all such principal payments.

    "Board of Directors" means, with respect to any Person, its Board of
Directors, general partner(s), manager(s), or similar governing body.

    "Calculation Date" means, with respect to the Incurrence of any Indebtedness
by CapRock or any of its Restricted Subsidiaries, the date such Indebtedness is
to be Incurred and, with respect to any Restricted Payment, the date such
Restricted Payment is to be made.

    "Capital Stock" means, with respect to any Person, any and all shares,
interests, participations or other equivalents (however designated, whether
voting or non-voting) in equity of such Person, whether outstanding on the
Closing Date or issued thereafter, including, without limitation, all Common
Stock and Preferred Stock.

    "Capitalized Lease" means, as applied to any Person, any lease of any
property (whether real, personal or mixed) of which the discounted present value
of the rental obligations of such Person as lessee, in conformity with GAAP, is
required to be capitalized on the balance sheet of such Person.

    "Capitalized Lease Obligations" means the discounted present value of the
rental obligations under a Capitalized Lease.

    "Change of Control" shall be deemed to occur if, after the Transaction
occurs:

    (i) the sale, conveyance, transfer or lease of all or substantially all of
the assets of CapRock to any Person or "group" (as such term is used in Sections
13(d)(3) and 14(d)(2) of the Securities Exchange Act, including any group acting
for the purpose of acquiring, holding or disposing of securities within the
meaning of Rule 13d-5(b)(1) under the Securities Exchange Act), other than to
one or more Permitted Holders and/or one or more Restricted Subsidiaries, shall
have occurred,

    (ii) any Person or "group" (as such term is used in Sections 13(d)(3) and
14(d)(2) of the Securities Exchange Act including any group acting for the
purpose of acquiring, holding or disposing of securities within the meaning of
Rule 13d-5(b)(1) under the Securities Exchange Act), other than any Permitted
Holder (or group that includes a Permitted Holder), becomes the "beneficial
owner" (as defined in Rule 13d-3 under the Securities Exchange Act) of more than
50% of the total voting power of all classes of the Voting Stock of CapRock
(including any warrants, options or rights to acquire such Voting Stock),
calculated on a fully diluted basis,

    (iii) during any period of two consecutive years, individuals who at the
beginning of such period constituted the Board of Directors of CapRock (together
with any directors whose election or appointment by the Board of Directors of
CapRock or whose nomination for election by the stockholders of CapRock was
approved by a vote of a majority of the directors then still in office who were
either directors at the beginning of such period or whose election or nomination
for election was previously so approved) cease for any reason to constitute a
majority of the Board of Directors of CapRock then in office or

    (iv) the merger, amalgamation or consolidation of CapRock with or into
another Person or the merger of another Person with or into CapRock shall have
occurred, and the securities of CapRock that are outstanding immediately prior
to such transaction and which represent 100% of the aggregate voting power of
the Voting Stock of CapRock are changed into or exchanged for cash, securities
or property, unless pursuant to such transaction such securities are changed
into or exchanged for, in addition to any other consideration, securities of the
surviving Person that represent, immediately after giving effect to such
transaction, at least a majority of the aggregate voting power of the Voting
Stock of the surviving Person.

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    "Closing Date" means the date on which the CapRock notes were originally
issued under the CapRock indenture.

    "Common Stock" means, with respect to any Person, any and all shares,
interests, participations or other equivalents (however designated, whether
voting or non-voting) of such Person's equity, other than Preferred Stock of
such Person, whether outstanding on the Closing Date or issued thereafter,
including, without limitation, all series and classes of such common stock.

    "Consolidated EBITDA" means, for any period, Adjusted Consolidated Net
Income for such period plus, to the extent such amount was deducted in
calculating such Adjusted Consolidated Net Income,

    (i) Consolidated Interest Expense,

    (ii) income taxes (other than income taxes (either positive or negative)
attributable to extraordinary and non-recurring gains or losses or sales of
assets),

    (iii) depreciation expense,

    (iv) amortization expense,

    (v) all other non-cash items reducing Adjusted Consolidated Net Income
(other than items that will require cash payments and for which an accrual or
reserve is, or is required by GAAP to be, made), and

    (vi) costs directly related to the Transaction, the Special Partnership
Transaction or the offering of the CapRock notes and expensed by CapRock in
accordance with GAAP on or prior to December 31, 1998,

less all non-cash items increasing Adjusted Consolidated Net Income, all as
determined on a consolidated basis for CapRock and its Restricted Subsidiaries
in conformity with GAAP; PROVIDED THAT, if any Restricted Subsidiary is not a
Wholly-Owned Restricted Subsidiary, Consolidated EBITDA shall be reduced (to the
extent not otherwise reduced in accordance with GAAP) by an amount equal to (A)
the amount of the Adjusted Consolidated Net Income attributable to such
Restricted Subsidiary multiplied by (B) the quotient of (1) the number of shares
of outstanding Common Stock of such Restricted Subsidiary not owned on the last
day of such period by CapRock or any of its Restricted Subsidiaries divided by
(2) the total number of shares of outstanding Common Stock of such Restricted
Subsidiary on the last day of such period.

    "Consolidated Interest Expense" means, for any period, without duplication,
the aggregate amount of interest in respect of Indebtedness, including, without
limitation:

    (i) amortization of original issue discount on any Indebtedness and the
interest portion of any deferred payment obligation, calculated in accordance
with the effective interest method of accounting;

    (ii) all commissions, discounts and other fees and charges owed with respect
to letters of credit and bankers' acceptance financing;

    (iii) the net costs associated with Interest Rate Agreements;

    (iv) Preferred Stock dividends of CapRock's Restricted Subsidiaries (other
than dividends paid in shares of Preferred Stock that are not Redeemable Stock)
declared and paid or payable;

    (v) accrued Redeemable Stock dividends of CapRock and its Restricted
Subsidiaries, whether or not declared or paid; and

    (vi) the interest component of rentals in respect of Capitalized Lease
Obligations paid, accrued or scheduled to be paid or to be accrued by CapRock
and its Restricted Subsidiaries during such period;

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excluding, however, (a) any amount of such interest of any Restricted Subsidiary
if the net income of such Restricted Subsidiary is excluded in the calculation
of Adjusted Consolidated Net Income pursuant to clause (iii) of the definition
thereof (but only in the same proportion as the net income of such Restricted
Subsidiary is excluded from the calculation of Adjusted Consolidated Net Income
pursuant to clause (iii) of the definition thereof) and (b) any premiums, fees
and expenses (and any amortization thereof) payable in connection with the
offering of the CapRock notes and the Transaction and the Special Partnership
Transaction, all as determined on a consolidated basis (without taking into
account Unrestricted Subsidiaries) in conformity with GAAP.

    "Consolidated Leverage Ratio" means, on any Calculation Date, the ratio of
(i) the aggregate amount of Indebtedness of CapRock and its Restricted
Subsidiaries on a consolidated basis outstanding on such Calculation Date to
(ii) the aggregate amount of Consolidated EBITDA for the then most recent four
fiscal quarters for which financial statements of CapRock have been filed with
the SEC or provided to the trustee pursuant to the "SEC Reports and Reports to
Holders" covenant described above or, if such financial statements do not cover
the most recent four fiscal quarters, then the most recent four fiscal quarters
for (x) CapRock (if the Transaction has occurred) giving pro forma effect to the
Transaction as if it occurred at the beginning of such four fiscal quarter
period or (y) CapRock Telecommunications Corp. and CapRock Fiber Network LTD.,
on a combined basis (if the Special Offer to Purchase has occurred), prepared in
accordance with GAAP (such four fiscal quarter period being the "Four Quarter
Period"); PROVIDED THAT, in making the foregoing calculation, (A) pro forma
effect shall be given to any Indebtedness to be Incurred or repaid on the
Calculation Date; (B) pro forma effect shall be given to Asset Dispositions and
Asset Acquisitions (including giving pro forma effect to the application of
proceeds of any Asset Disposition) that occur from the beginning of the Four
Quarter Period through the Calculation Date (the "Reference Period"), as if they
had occurred and such proceeds had been applied on the first day of such
Reference Period; and (C) pro forma effect shall be given to asset dispositions
and asset acquisitions (including giving pro forma effect to the application of
proceeds of any asset disposition) that have been made by any Person that has
become a Restricted Subsidiary or has been merged with or into CapRock or any
Restricted Subsidiary during such Reference Period and that would have
constituted Asset Dispositions or Asset Acquisitions had such transactions
occurred when such Person was a Restricted Subsidiary, as if such asset
dispositions or asset acquisitions had occurred on the first day of such
Reference Period; PROVIDED THAT to the extent that clause (B) or (C) of this
sentence requires that pro forma effect be given to an Asset Acquisition or
Asset Disposition, such pro forma calculation shall be based upon the four full
fiscal quarters immediately preceding the Calculation Date of the Person, or
division or line of business of the Person, that is acquired or disposed of for
which financial information is available.

    "Consolidated Net Worth" means, at any date of determination, stockholders'
equity as set forth on the most recently available quarterly or annual
consolidated balance sheet of CapRock and its Restricted Subsidiaries (which
shall be as of a date not more than 90 days prior to the date of such
computation and which shall not take into account Unrestricted Subsidiaries),
less any amounts attributable to Redeemable Stock or any equity security
convertible into or exchangeable for Indebtedness, the cost of treasury stock
and the outstanding principal amount of any promissory notes receivable from the
sale of the Capital Stock of CapRock or any of its Restricted Subsidiaries, each
item to be determined in conformity with GAAP (excluding the effects of foreign
currency exchange adjustments under Financial Accounting Standards Board
Statement of Financial Accounting Standards No. 52).

    "Credit Facilities" means any senior commercial term loan and/or revolving
credit or working capital facility or any letter of credit facility entered into
principally with commercial banks and/or other financial institutions typically
party to commercial loan agreements.

    "Currency Agreement" means any spot or forward foreign exchange contract,
currency swap agreement, currency option or other similar financial agreement or
arrangement entered into by

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CapRock or any of its Subsidiaries designed solely to protect against or manage
exposure to fluctuations in currency exchange rates.

    "Default" means any event that is, or after notice or passage of time or
both would be, an Event of Default.

    "Disinterested Director" means, with respect to any matter, a member of the
Board of Directors who does not have any material direct or indirect financial
interest in or with respect to such matter.

    "Escrow Account" shall have the meaning set forth in the Escrow Agreement.

    "Escrow Agreement" means the Escrow and Security Agreement among CapRock,
CapRock Telecommunications Corp., CapRock Fiber Network, LTD., IWL
Communications, Incorporated and the trustee, substantially in the form
delivered to the trustee on the Closing Date.

    "fair market value" means the price that would be paid in an arm's-length
transaction between a willing seller under no compulsion to sell and a willing
buyer under no compulsion to buy, as determined in good faith by the Board of
Directors, whose determination shall be conclusive if evidenced by a Board
Resolution; PROVIDED THAT for purposes of clause (viii) of the definition of
"Permitted Indebtedness", (x) the fair market value of any security registered
under the Securities Exchange Act shall be the average of the closing prices,
regular way, of such security for the 20 consecutive trading days immediately
preceding the capital contribution or sale of Capital Stock and (y) in the event
the aggregate fair market value of any other property (other than cash or cash
equivalents) received by CapRock exceeds $10 million, the fair market value of
such property shall be determined by a nationally recognized investment banking
firm (selected by the Board of Directors of CapRock) and set forth in their
written opinion which shall be delivered to the trustee.

    "GAAP" means generally accepted accounting principles in the United States
of America in effect on the Closing Date, including, without limitation, those
set forth in the opinions and pronouncements of the Accounting Principles Board
of the American Institute of Certified Public Accountants and statements and
pronouncements of the Financial Accounting Standards Board or in such other
statements by such other entity as approved by a significant segment of the
accounting profession.

    "Guarantee" means any obligation, contingent or otherwise, of any Person
directly or indirectly guaranteeing any Indebtedness of any other Person and,
without limiting the generality of the foregoing, any obligation, direct or
indirect, contingent or otherwise, of such Person (i) to purchase or pay (or
advance or supply funds for the purchase or payment of) such Indebtedness of
such other Person (whether arising by virtue of partnership arrangements, or by
agreements to keep-well, to purchase assets, goods, securities or services
(unless such purchase arrangements are on arm's-length and are entered into in
the ordinary course of business), to take-or-pay, or to maintain financial
statement conditions or otherwise) or (ii) entered into for purposes of assuring
in any other manner the obligee of such Indebtedness of the payment thereof or
to protect such obligee against loss in respect thereof (in whole or in part);
PROVIDED THAT the term "Guarantee" shall not include endorsements for collection
or deposit in the ordinary course of business. The term "Guarantee" used as a
verb has a corresponding meaning.

    "Guaranteed Indebtedness" has the meaning given it under the caption
"Limitation on Issuances of Guarantees by Restricted Subsidiaries."

    "Holder" means the registered holder of any CapRock note.

    "Incur" means, with respect to any Indebtedness, to incur, create, issue,
assume, Guarantee or otherwise become liable for or with respect to, or become
responsible for, the payment of, contingently or otherwise, such Indebtedness,
including an Incurrence of Acquired Indebtedness; PROVIDED THAT neither the
accrual of interest nor the accretion of original issue discount shall be
considered an Incurrence of Indebtedness. The terms "Incurrence" and "Incurred"
shall have corresponding meanings.

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    "Indebtedness" means, with respect to any Person at any date of
determination (without duplication):

    (i) all indebtedness of such Person for borrowed money,

    (ii) all obligations of such Person evidenced by bonds, debentures, notes or
other similar instruments,

    (iii) all obligations of such Person in respect of letters of credit,
acceptance facilities or other similar instruments (including reimbursement
obligations with respect thereto),

    (iv) all obligations of such Person to pay the deferred and unpaid purchase
price of property or services, which purchase price is due more than six months
after the date of placing such property in service or taking delivery and title
thereto or the completion of such services,

    (v) all Capitalized Lease Obligations of such Person,

    (vi) all Indebtedness of other Persons secured by a Lien on any asset of
such Person, whether or not such Indebtedness is assumed by such Person;
PROVIDED THAT the amount of such Indebtedness shall be the lesser of (A) the
fair market value of such asset at such date of determination and (B) the amount
of such Indebtedness,

    (vii) all Indebtedness of other Persons and all dividends and distributions
of another Person the payment of which, in either case, such Person has
Guaranteed or is responsible or liable for, directly or indirectly, as obligor,
guarantor or otherwise,

    (viii) all Redeemable Stock of such Person valued at its maximum fixed
repurchase price plus (to the extent not otherwise included in such repurchase
price) accrued and unpaid dividends payable prior to the Stated Maturity of the
CapRock notes in connection with a mandatory redemption or in connection with a
redemption at the option of the holder thereof unless such Redeemable Stock has
actually been called for redemption but not yet redeemed, in which case it shall
be valued at the redemption price therefor plus such accrued and unpaid
dividends unless the holder thereof can require redemption or repurchase at any
higher price, and

    (ix) to the extent not otherwise included in this definition, obligations
under Currency Agreements and Interest Rate Agreements.

    The amount of Indebtedness of any Person at any date shall be the
outstanding balance at such date of all unconditional obligations as described
above and, with respect to contingent obligations, the maximum liability upon
the occurrence of the contingency giving rise to the obligation.

    Notwithstanding anything herein to the contrary:

    (A) the amount outstanding at any time of any Indebtedness issued with
original issue discount is the face amount of such Indebtedness less the
remaining unamortized portion of the original issue discount of such
Indebtedness at the time of its issuance, as determined in conformity with GAAP,

    (B) money borrowed and set aside at the time of the Incurrence of any
Indebtedness or thereafter in order to refund the payment of the interest on
such Indebtedness shall not be deemed to be "Indebtedness,"

    (C) Indebtedness shall not include any liability for federal, state, local
or other taxes,

    (D) Indebtedness shall not include any Trade Payable or amounts due under
leases that are not Capitalized Lease Obligations,

    (E) Indebtedness shall not include amounts due with respect to any customer
advance payments and customer deposits in the ordinary course of business with
CapRock or any Restricted Subsidiary, and

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    (F) Indebtedness shall not include overdrafts.

    For purposes hereof, the "maximum fixed repurchase price" of any Redeemable
Stock which does not have a fixed repurchase price shall be calculated in
accordance with the terms of such Redeemable Stock as if such Redeemable Stock
were purchased on any date on which Indebtedness shall be required to be
determined pursuant to the CapRock indenture, and if such price is based upon,
or measured by, the fair market value of such Redeemable Stock, such fair market
value shall be determined in good faith by the Board of Directors of the issuer
of such Redeemable Stock.

    "Interest Rate Agreement" means any interest rate protection agreement,
interest rate future agreement, interest rate option agreement, interest rate
swap agreement, interest rate cap agreement, interest rate collar agreement,
interest rate hedge agreement, option or future contract or other similar
agreement or arrangement.

    "Investment" in any Person means any direct or indirect advance, loan,
account receivable (other than an account receivable arising in the ordinary
course of business) or other extension of credit (including, without limitation,
by way of Guarantee or similar arrangement) or any capital contribution to (by
means of any transfer of cash or other property to others or any payment for
property or services for the account or use of others), or any purchase or
acquisition of Capital Stock, bonds, notes, debentures or other similar
instruments issued by, such Person and shall include (i) the designation of a
Restricted Subsidiary as an Unrestricted Subsidiary and (ii) the fair market
value of the Capital Stock (or any other Investment), held by CapRock or any of
its Restricted Subsidiaries, of (or in) any Person that has ceased to be a
Restricted Subsidiary at the time it so ceases to be a Restricted Subsidiary,
including, without limitation, by reason of any transaction permitted by clause
(iii) of the "Limitation on the Issuance and Sale of Capital Stock of Restricted
Subsidiaries" covenant described above. For purposes of the definition of
"Unrestricted Subsidiary" and the "Limitation on Restricted Payments" covenant
described above, (i) "Investment" shall include the fair market value of the
assets (net of liabilities (other than liabilities to CapRock or any of its
Subsidiaries)) of any Restricted Subsidiary at the time that such Restricted
Subsidiary is designated an Unrestricted Subsidiary, (ii) the fair market value
of the assets (net of liabilities (other than liabilities to CapRock or any of
its Subsidiaries)) of any Unrestricted Subsidiary at the time that such
Unrestricted Subsidiary is designated a Restricted Subsidiary shall be
considered a reduction in outstanding Investments and (iii) any property
transferred to or from any Person shall be valued at its fair market value at
the time of such transfer.

    "Issuer" shall initially mean, collectively, CapRock, CapRock
Telecommunications Corp. and CapRock Fiber Network, LTD. and shall mean (i)
CapRock after the Transaction is consummated, or (ii) CapRock Telecommunications
Corp. and CapRock Fiber Network, LTD. after the payment of all CapRock notes
tendered in the Special Offer to Purchase, if any CapRock notes remain
outstanding. To the extent financial calculations are made with respect to
CapRock following the closing of the Transaction for any period or as of any
date prior to the closing of the Transaction, those calculations should include
the transactions, financial results or financial status of CapRock
Telecommunications Corp., CapRock Fiber Network, LTD. and IWL Communications,
Incorporated for such period or as of such date.

    "Lien" means any mortgage, pledge, security interest, encumbrance, lien
(statutory or other) or charge of any kind (including, without limitation, any
conditional sale or other title retention agreement or lease in the nature
thereof or any agreement to give any security interest). The term "Lien" does
not include any lease or grant of rights to use any fiber or other asset under
an arrangement that does not qualify as a conditional sale or other title
retention agreement or lease in the nature thereof or a switch partition.

    "Merger Agreement" means that certain Agreement and Plan of Merger and Plan
of Exchange dated as of February 16, 1998 among CapRock, CapRock
Telecommunications Corp., CapRock Fiber

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Network, LTD., IWL Communications, Incorporated and certain other parties
thereto, as amended through the Closing Date and thereafter in accordance with
the terms of the CapRock indenture.

    "Net Cash Proceeds" means, (a) with respect to any Asset Sale, the proceeds
of such Asset Sale in the form of cash or cash equivalents, including payments
in respect of deferred payment obligations (to the extent corresponding to the
principal, but not interest, component thereof) when received in the form of
cash or cash equivalents (except to the extent such obligations are financed or
sold with recourse to CapRock or any Restricted Subsidiary) and proceeds from
the conversion of other property received when converted to cash or cash
equivalents, net of (i) brokerage commissions and other fees and expenses
(including fees and expenses of counsel and investment bankers) related to such
Asset Sale, (ii) provisions for all taxes (whether or not such taxes will
actually be paid or are payable) as a result of such Asset Sale without regard
to the consolidated results of operations of CapRock and its Restricted
Subsidiaries, taken as a whole, (iii) payments made to repay Indebtedness or any
other obligation outstanding at the time of such Asset Sale that either (A) is
secured by a Lien on the property or assets sold or (B) is required to be paid
as a result of such sale and (iv) appropriate amounts to be provided by CapRock
or any Restricted Subsidiary as a reserve against any liabilities associated
with such Asset Sale, including, without limitation, pension and other
post-employment benefit liabilities, liabilities related to environmental
matters and liabilities under any indemnification obligations associated with
such Asset Sale, all as determined in conformity with GAAP, and (b) with respect
to any capital contribution or issuance or sale of Capital Stock, options,
warrants or other rights to acquire Capital Stock or Indebtedness, the proceeds
of such capital contribution or issuance or sale in the form of cash or cash
equivalents, including payments in respect of deferred payment obligations (to
the extent corresponding to the principal, but not interest, component thereof)
when received in the form of cash or cash equivalents (except to the extent such
obligations are financed or sold with recourse to CapRock or any Restricted
Subsidiary) and proceeds from the conversion of other property received when
converted to cash or cash equivalents, net of attorney's fees, accountants'
fees, underwriters' or placement agents' fees, discounts or commissions and
brokerage, consultant and other fees incurred in connection with such issuance
or sale and net of taxes payable as a result thereof.

    "Offer to Purchase" means an offer by CapRock to purchase CapRock notes from
the Holders commenced by mailing a notice to the trustee and each Holder
stating:

    (i) the covenant pursuant to which the offer is being made and that all
CapRock notes validly tendered will be accepted for payment on a pro rata basis;

    (ii) the purchase price and the date of purchase (which shall be a Business
Day no earlier than 30 days nor later than 60 days from the date such notice is
mailed);

    (iii) that any CapRock note not tendered will continue to accrue interest
pursuant to its terms;

    (iv) that, unless CapRock defaults in the payment of the purchase price, any
CapRock note accepted for payment pursuant to the Offer to Purchase shall cease
to accrue interest on and after the Payment Date;

    (v) that Holders electing to have a CapRock note purchased pursuant to the
Offer to Purchase will be required to surrender the CapRock note, together with
the form entitled "Option of the Holder to Elect Purchase" on the reverse side
of the CapRock note completed, to the Paying Agent at the address specified in
the notice prior to the close of business on the Business Day immediately
preceding the Payment Date;

    (vi) that Holders will be entitled to withdraw their election if the Paying
Agent receives, not later than the close of business on the third Business Day
immediately preceding the Payment Date, a facsimile transmission or letter
setting forth the name of such Holder, the principal amount of CapRock notes
delivered for purchase and a statement that such Holder is withdrawing his
election to have such CapRock notes purchased; and

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    (vii) that Holders whose CapRock notes are being purchased only in part will
be issued new CapRock notes equal in principal amount to the unpurchased portion
of the CapRock notes surrendered; PROVIDED THAT each CapRock note purchased and
each new CapRock note issued shall be in a principal amount of $1,000 or
integral multiples thereof.

    On the Payment Date, CapRock shall (i) accept for payment on a pro rata
basis CapRock notes or portions thereof tendered pursuant to an Offer to
Purchase; (ii) deposit with the Paying Agent money sufficient to pay the
purchase price of all CapRock notes or portions thereof so accepted; and (iii)
deliver, or cause to be delivered, to the trustee all CapRock notes or portions
thereof so accepted together with an Officers' Certificate specifying the
CapRock notes or portions thereof accepted for payment by CapRock. The Paying
Agent shall promptly mail to the Holders of CapRock notes so accepted payment in
an amount equal to the purchase price, and the trustee shall promptly
authenticate and mail to such Holders a new CapRock note equal in principal
amount to any unpurchased portion of the CapRock note surrendered; PROVIDED THAT
each CapRock note purchased and each new CapRock note issued shall be in a
principal amount of $1,000 or integral multiples thereof. CapRock will publicly
announce the results of an Offer to Purchase as soon as practicable after the
Payment Date. The trustee shall act as the Paying Agent for an Offer to
Purchase. CapRock will comply with Rule 14e-1 under the Securities Exchange Act
and any other securities laws and regulations thereunder to the extent such laws
and regulations are applicable, in the event that CapRock is required to
repurchase CapRock notes pursuant to an Offer to Purchase.

    "Payment Date" means the date on which any CapRock note is purchased
pursuant to an Offer to Purchase or the Special Offer to Purchase.

    "Permitted Holders" means Jere W. Thompson, Sr., Jere W. Thompson, Jr., Mark
Langdale, Timothy W. Rogers, Scott L. Roberts, Timothy M. Terrell and Ignatius
W. Leonards and any corporation, limited liability company, partnership, joint
venture or other entity controlled by any one or more of them.

    "Permitted Indebtedness" means any of the following:

    (i) Indebtedness of CapRock pursuant to the CapRock notes;

    (ii) Indebtedness owed (A) to CapRock and evidenced by an unsubordinated
promissory note or (B) to any Restricted Subsidiaries; PROVIDED THAT such
Indebtedness to any Restricted Subsidiary is subordinated in right of payment
from and after such time as the CapRock notes shall become due and payable
(whether at Stated Maturity, by acceleration or otherwise); PROVIDED further any
event which results in any such Restricted Subsidiary ceasing to be a Restricted
Subsidiary or any subsequent transfer of such Indebtedness (other than to
CapRock or another Restricted Subsidiary) shall be deemed, in each case, to
constitute an Incurrence of such Indebtedness not permitted by this clause (ii);

    (iii) Indebtedness issued in exchange for, or the net proceeds of which are
used to refinance or refund, then outstanding Indebtedness (other than
Indebtedness Incurred under clause (ii), (iv), (vi) or (xii) of the definition
of Permitted Indebtedness) and any refinancings of such new Indebtedness in an
amount not to exceed the amount so refinanced or refunded (plus premiums,
accrued interest, fees and expenses); PROVIDED THAT Indebtedness the proceeds of
which are used to refinance or refund the CapRock notes or Indebtedness that is
PARI PASSU in right of payment with, or subordinated in right of payment to, the
CapRock notes shall only be permitted under this clause (iii) if (A) in case the
CapRock notes are refinanced in part or the Indebtedness to be refinanced is
PARI PASSU in right of payment with the CapRock notes, such new Indebtedness, by
its terms or by the terms of any agreement or instrument pursuant to which such
new Indebtedness is outstanding, is expressly made PARI PASSU in right of
payment with, or subordinate in right of payment to, the remaining CapRock
notes, (B) in case the Indebtedness to be refinanced is subordinated in right of
payment to the CapRock notes, such new Indebtedness, by its terms or by the
terms of any agreement or instrument

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pursuant to which such new Indebtedness is issued or remains outstanding, is
expressly made subordinate in right of payment to the CapRock notes at least to
the extent that the Indebtedness to be refinanced is subordinated to the CapRock
notes and (C) such new Indebtedness, determined as of the date of Incurrence of
such new Indebtedness, does not mature prior to the Stated Maturity of the
Indebtedness to be refinanced or refunded, and the Average Life of such new
Indebtedness is at least equal to the remaining Average Life of the Indebtedness
to be refinanced or refunded; and PROVIDED FURTHER that in no event may
Indebtedness of CapRock be refinanced by means of any Indebtedness of any
Restricted Subsidiary pursuant to this clause (iii);

    (iv) Indebtedness (A) to reimburse workers' compensation insurance companies
for claims paid by such companies on behalf of CapRock or any Restricted
Subsidiary in accordance with the policies issued to CapRock and the Restricted
Subsidiaries, (B) in respect of performance, surety or appeal bonds or similar
obligations provided in the ordinary course of business, or (C) under Currency
Agreements and Interest Rate Agreements; PROVIDED THAT such agreements (I) are
designed solely to protect CapRock or its Subsidiaries against fluctuations in
foreign currency exchange rates or interest rates and (II) do not increase the
Indebtedness of the obligor outstanding at any time other than as a result of
fluctuations in foreign currency exchange rates or interest rates or by reason
of fees, indemnities and compensation payable thereunder or (D) arising from
agreements providing for indemnification, adjustment of purchase price or
similar obligations, or from Guarantees or letters of credit, surety bonds or
performance bonds securing any obligations of CapRock or any of its Restricted
Subsidiaries pursuant to such agreements, in each case Incurred in connection
with the disposition of any business, assets or Restricted Subsidiary (other
than Guarantees of Indebtedness Incurred by any Person acquiring all or any
portion of such business, assets or Restricted Subsidiary for the purpose of
financing such acquisition), in a principal amount not to exceed the gross
proceeds actually received by CapRock or any Restricted Subsidiary in connection
with such disposition;

    (v) Indebtedness of CapRock, to the extent the net proceeds thereof are
promptly used to purchase CapRock notes tendered in the Special Offer to
Purchase or in an Offer to Purchase made as a result of a Change of Control or
Indebtedness of CapRock or any Restricted Subsidiary to the extent the net
proceeds thereof are promptly deposited to defease all of the CapRock notes as
described above under "--Defeasance;"

    (vi) Guarantees of the CapRock notes and Guarantees of Indebtedness of
CapRock by any Restricted Subsidiary; PROVIDED THAT the Guarantee of such
Indebtedness is permitted by and made in accordance with the "Limitation on
Issuance of Guarantees by Restricted Subsidiaries" covenant described above;

    (vii) Acquired Indebtedness and any Indebtedness issued in exchange for, or
the net proceeds of which are used to refinance or refund, such Acquired
Indebtedness in an amount not to exceed the amount so refinanced or refunded
(plus premium, accrued interest, and reasonable fees and expenses) in an
aggregate amount not to exceed at any one time outstanding $25 million;

    (viii) (A) Indebtedness of CapRock not to exceed, at any one time
outstanding, two times the Net Cash Proceeds received by CapRock after the
Closing Date (and, in the event the Transaction is consummated, the aggregate
Net Cash Proceeds received by CapRock Telecommunications Corp., CapRock Fiber
Network, LTD. or IWL Communications, Incorporated during the Transition Period)
as a capital contribution or from the issuance and sale of its Capital Stock
(other than Redeemable Stock) or options, warrants or other rights to acquire
Capital Stock (other than Redeemable Stock) to a Person that is not a Subsidiary
of CapRock (or CapRock Telecommunications Corp., CapRock Fiber Network, LTD. or
IWL Communications, Incorporated, if applicable) to the extent such Net Cash
Proceeds have not been used pursuant to clause (C)(2) of the first paragraph or
clause (iii), (iv) or (vi) of the second paragraph of the "Limitation on
Restricted Payments" covenant described above to make a Restricted Payment less
any Indebtedness Incurred pursuant to clause (B), (B) Indebtedness Incurred by
(x) CapRock and/or (y) any of the Restricted Subsidiaries in an aggregate amount
not to

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exceed, at any one time outstanding, the Net Cash Proceeds received by CapRock
after the Closing Date (and, in the event the Transaction is consummated, the
aggregate Net Cash Proceeds received by CapRock Telecommunications Corp.,
CapRock Fiber Network, LTD. or IWL Communications, Incorporated during the
Transition Period) as a capital contribution or from the issuance and sale of
its Capital Stock (other than Redeemable Stock) or options, warrants or other
rights to acquire Capital Stock (other than Redeemable Stock) to a Person that
is not a Subsidiary of CapRock (or CapRock Telecommunications Corp., CapRock
Fiber Network, LTD. or IWL Communications, Incorporated, if applicable) to the
extent such Net Cash Proceeds have not been used pursuant to clause (C)(2) of
the first paragraph or clause (iii), (iv) or (vi) of the second paragraph of the
"Limitation on Restricted Payments" covenant described above to make a
Restricted Payment; PROVIDED THAT the Incurrence of Indebtedness pursuant to
this clause (B) will only be permitted to the extent that such Incurrence does
not cause the amount of Indebtedness Incurred pursuant to clause (A) to exceed
the amount permitted thereunder, and (C) Indebtedness of CapRock not to exceed,
at any one time outstanding, 100% of the fair market value of property (other
than cash and cash equivalents) received by CapRock after the Closing Date (and,
in the event the Transaction is consummated, by CapRock Telecommunications
Corp., CapRock Fiber Network, LTD. or IWL Communications, Incorporated during
the Transition Period) from a contribution of capital or the proceeds from the
sale of its Capital Stock (other than Redeemable Stock) or options, warrants or
other rights to acquire Capital Stock (other than Redeemable Stock) to a Person
that is not CapRock (or CapRock Telecommunications Corp., CapRock Fiber Network,
LTD. or IWL Communications, Incorporated, if applicable) or a Restricted
Subsidiary, to the extent such capital contribution or sale of Capital Stock or
options, warrants or rights have not been used pursuant to clause (iii),
(iv) or (ix) of the second paragraph of the "Limitation on Restricted Payments"
covenant described above to make a Restricted Payment; PROVIDED THAT such
Indebtedness does not mature prior to the Stated Maturity of the CapRock notes
and has an Average Life longer than the CapRock notes;

    (ix) Indebtedness under one or more Credit Facilities or Vendor Credit
Facilities; PROVIDED THAT the aggregate principal amount of any Indebtedness
incurred pursuant to this clause (ix) (including any amounts refinanced or
refunded under this clause (ix)) does not exceed at any time outstanding the
greater of (x) 85% of eligible accounts receivable and 65% of eligible inventory
of CapRock and its Restricted Subsidiaries as of the last fiscal quarter for
which financial statements are prepared or (y) $100 million less any amount of
such Indebtedness permanently repaid as provided under the "Limitation on Asset
Sales" covenant described above;

    (x) Indebtedness existing as of the Closing Date and Indebtedness existing
as of the date of consummation of the Transaction or the Special Partnership
Transaction (to the extent such Indebtedness is incurred without violation of
the CapRock indenture);

    (xi) Capitalized Lease Obligations in an aggregate principal amount
outstanding at any time not to exceed $10 million; and

    (xii) Indebtedness of CapRock (in addition to Indebtedness permitted under
clauses (i) through (xi) above) in the aggregate principal amount outstanding at
any time not to exceed $50 million, less any amount of such Indebtedness
permanently repaid as provided under the "Limitation on Asset Sales" covenant
described above.

    "Permitted Investment" means any of the following:

    (i) an Investment in CapRock or a Restricted Subsidiary or a Person which
will, upon the making of such Investment, become a Restricted Subsidiary or be
merged or consolidated with or into or transfer or convey all or substantially
all its assets to, CapRock or a Restricted Subsidiary; PROVIDED THAT such
Person's primary business is related, ancillary or complementary to the
businesses of CapRock and its Restricted Subsidiaries on the date of such
Investment;

    (ii) a Temporary Cash Investment;

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    (iii) commission, payroll, travel, relocation and similar advances to cover
matters that are expected at the time of such advances ultimately to be treated
as expenses in accordance with GAAP;

    (iv) stock, obligations or securities received in satisfaction of judgments
or settlement of disputed accounts receivable that arose in the ordinary course
of business;

    (v) Investments in prepaid expenses, negotiable instruments held for
collection, and lease, utility and workers' compensation, performance and other
similar deposits;

    (vi) Interest Rate Agreements and Currency Agreements to the extent
permitted under clause (iv) of the definition of "Permitted Indebtedness;" and

    (vii) loans and advances to employees of CapRock or any Subsidiary in an
aggregate amount not to exceed $1 million at any time outstanding.

    "Permitted Liens" means any of the following:

    (i) Liens for taxes, fees, assessments, governmental charges or claims that
are not yet due and payable, or, if delinquent, are payable without penalty or
are being contested in good faith by appropriate legal proceedings promptly
instituted and diligently conducted and for which a reserve or other appropriate
provisions, if any, as shall be required in conformity with GAAP shall have been
made;

    (ii) statutory and common law Liens of landlords and carriers, warehousemen,
mechanics, suppliers, material men, repairmen or other similar Liens arising in
the ordinary course of business and with respect to amounts not yet delinquent,
or, if delinquent, are payable without penalty or are or being contested in good
faith by appropriate legal proceedings promptly instituted and diligently
conducted and for which a reserve or other appropriate provision, if any, as
shall be required in conformity with GAAP shall have been made;

    (iii) Liens incurred or deposits made in the ordinary course of business in
connection with workers' compensation, unemployment insurance and other types of
social security;

    (iv) Liens incurred or deposits made to secure the performance of tenders,
bids, leases, statutory or regulatory obligations, bankers' acceptances, surety
and appeal bonds, government contracts, performance and return-of money bonds
and other obligations of a similar nature incurred in the ordinary course of
business (exclusive of obligations for the payment of borrowed money);

    (v) easements, rights-of-way, restrictions, municipal and zoning ordinances,
reservations, permits and similar charges, encumbrances, title defects or other
irregularities that do not materially interfere with the ordinary course of
business of CapRock or any of its Restricted Subsidiaries;

    (vi) Liens securing Acquired Indebtedness created prior to (and not in
connection with or in contemplation of) the Incurrence of such Indebtedness by
CapRock or any Restricted Subsidiary; PROVIDED THAT such Lien does not extend to
any property or assets of CapRock or any Restricted Subsidiary other than the
asset acquired in connection with the Incurrence of such Acquired Indebtedness;

    (vii) leases or subleases granted to others that do not materially interfere
with the ordinary course of business of CapRock and its Restricted Subsidiaries,
taken as a whole;

    (viii) Liens encumbering property or assets under construction arising from
progress or partial payments by a customer of CapRock or its Restricted
Subsidiaries relating to such property or assets;

    (ix) any interest or title of a lessor in the property subject to any
Capitalized Lease or operating lease;

    (x) Liens arising from filing Uniform Commercial Code financing statements
regarding leases;

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    (xi) Liens on property of, or on shares of Capital Stock or Indebtedness of,
any Person existing at the time such Person becomes, or becomes a part of, any
Restricted Subsidiary; PROVIDED THAT such Liens do not extend to or cover any
property or assets of CapRock or any Restricted Subsidiary other than the
property or assets acquired and any proceeds thereof;

    (xii) Liens in favor of CapRock or any Restricted Subsidiary;

    (xiii) Liens arising from the rendering of a final judgment or order against
CapRock or any Restricted Subsidiary that does not give rise to an Event of
Default;

    (xiv) Liens securing reimbursement obligations with respect to letters of
credit that encumber documents and other property relating to such letters of
credit and the products and proceeds thereof;

    (xv) Liens in favor of customs and revenue authorities arising as a matter
of law to secure payment of customs duties in connection with the importation of
goods;

    (xvi) Liens encumbering customary initial deposits and margin deposits, and
other Liens that are either within the general parameters customary in the
industry or incurred in the ordinary course of business, in each case securing
Indebtedness under Interest Rate Agreements and Currency Agreements and forward
contracts, options, future contracts, futures options or similar agreements or
arrangements designed solely to protect CapRock or any of its Restricted
Subsidiaries from fluctuations in interest rates, currencies or the price of
commodities;

    (xvii) Liens arising out of conditional sale, title retention, consignment
or similar arrangements for the sale of goods entered into by CapRock or any of
its Restricted Subsidiaries in the ordinary course of business in accordance
with the past practices of CapRock and its Restricted Subsidiaries prior to the
Closing Date;

    (xviii) Liens on or sales of receivables, including related intangible
assets and proceeds thereof;

    (xix) Liens securing Indebtedness incurred under clauses (iv)(A), (iv)(B),
(vii), (viii)(B), (ix), (x) or (xii) of the definition of "Permitted
Indebtedness;"

    (xx) Liens arising solely by virtue of any statutory or common law provision
relating to banker's liens, rights of set-off, or similar rights and remedies as
to deposit accounts or other funds maintained with a creditor depository
institution;

    (xxi) Liens securing Capitalized Lease Obligations on assets subject to such
Capitalized Leases;

    (xxii) Liens of CapRock (which term shall include CapRock Telecommunications
Corp., CapRock Fiber Network, LTD. and IWL Communications, Incorporated if the
Transaction is consummated) or any Restricted Subsidiary securing Indebtedness
in effect at the Closing Date or at the date on which the Transaction or the
Special Partnership Transaction, as the case may be, is consummated (to the
extent such Indebtedness Incurred after the Closing Date was incurred without
violation of the CapRock indenture);

    (xxiii) Liens granted after the Closing Date on any assets or Capital Stock
of CapRock or its Restricted Subsidiaries created in favor of the Holders;

    (xxiv) Liens with respect to the assets of a Restricted Subsidiary granted
by such Restricted Subsidiary to CapRock or a Wholly-Owned Restricted Subsidiary
to secure Indebtedness owing to CapRock or such other Restricted Subsidiary;

    (xxv) Liens securing Indebtedness that is Incurred to refinance secured
Indebtedness permitted to be Incurred under clause (iii) of the definition of
"Permitted Indebtedness"; PROVIDED THAT such Liens do not extend to or cover any
property or assets of CapRock or any Restricted Subsidiary other than the
property or assets securing the Indebtedness being refinanced; or

    (xxvi) any extension, renewal or replacement, in whole or in part, of any
Lien described in the foregoing clauses (i) through (xxv); PROVIDED THAT any
such extension, renewal or replacement shall be no more restricted in any
material respect than the Lien so extended, renewed or replaced and shall not
extend to any additional property or assets.

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    "Preferred Stock" means, with respect to any Person, any and all shares,
interests, participations or other equivalents (however designated, whether
voting or non-voting) of such Person's preferred or preference equity, whether
outstanding on the Closing Date or issued thereafter, including, without
limitation, all series and classes of such preferred or preference stock.

    "pro forma" means, with respect to the preparation of financial statements
to show the effect of any particular transaction, the preparation of such
financial statements in accordance with Article 11 of Regulation S-X.

    "Redeemable Stock" means any class or series of Capital Stock of any Person
that by its terms or otherwise is (i) required to be redeemed prior to the
Stated Maturity of the CapRock notes, (ii) redeemable at the option of the
holder of such class or series of Capital Stock at any time prior to the Stated
Maturity of the CapRock notes or (iii) convertible into or exchangeable for
Capital Stock referred to in clause (i) or (ii) above or Indebtedness having a
scheduled maturity prior to the Stated Maturity of the CapRock notes; PROVIDED
THAT any Capital Stock that would not constitute Redeemable Stock but for
provisions thereof giving holders thereof the right to require such Person to
repurchase or redeem such Capital Stock upon the occurrence of an "asset sale"
or "change of control" occurring prior to the Stated Maturity of the CapRock
notes shall not constitute Redeemable Stock if the "asset sale" or "change of
control" provisions applicable to such Capital Stock are no more favorable in
any material respect to the holders of such Capital Stock than the provisions
contained in "Limitation on Asset Sales" and "Repurchase of CapRock Notes Upon a
Change of Control" covenants described above are to the holders of the CapRock
notes and such Capital Stock specifically provides that such Person will not
repurchase or redeem any such stock pursuant to such provision prior to
CapRock's repurchase of such CapRock notes as are required to be repurchased
pursuant to the "Limitation on Asset Sales" and "Repurchase of CapRock Notes
Upon a Change of Control" covenants described above.

    "Restricted Payment" means

    (i) a declaration or payment of any dividend or the making of any
distribution on or with respect to CapRock's Capital Stock (other than (x)
dividends or distributions payable solely in shares of CapRock's Capital Stock
(other than Redeemable Stock) or in options, warrants or other rights to acquire
shares of such Capital Stock and (y) dividends or distributions payable to
CapRock or any Wholly-Owned Restricted Subsidiary),

    (ii) a payment made by CapRock or any Restricted Subsidiary used to
purchase, redeem, retire or otherwise acquire for value any shares of Capital
Stock of (A) CapRock or an Unrestricted Subsidiary (including options, warrants
or other rights to acquire such shares of Capital Stock) held by any Person or
(B) a Restricted Subsidiary (including options, warrants or other rights to
acquire such shares of Capital Stock) held by any Affiliate of CapRock (other
than a Wholly-Owned Restricted Subsidiary) or any holder (or any Affiliate of
such holder) of 5% or more of any class of Capital Stock of CapRock (including
options, warrants or other rights to acquire such shares of Capital Stock)
(other than (x) payments payable solely in shares of Capital Stock (other than
Redeemable Stock) of CapRock or in options, warrants or other rights to acquire
shares of such Capital Stock and (y) payments payable to CapRock or any
Wholly-Owned Restricted Subsidiary),

    (iii) any voluntary or optional principal payment, or voluntary or optional
redemption, repurchase, defeasance, or other acquisition or retirement for
value, of Indebtedness of CapRock that is subordinated in right of payment to
the CapRock notes (other than, in each case, the purchase, repurchase or
acquisition of Indebtedness either in anticipation of satisfying a sinking fund
obligation, principal installment or final maturity that in any case is due
within one year after the date of such purchase, repurchase or acquisition), or

    (iv) any Investment, other than a Permitted Investment, in any Person.

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    The consummation of the transactions contemplated by the Transaction or the
Special Partnership Transaction shall not constitute "Restricted Payments."

    "Restricted Subsidiary" means any Subsidiary of CapRock other than an
Unrestricted Subsidiary.

    "SEC" means the Securities and Exchange Commission.

    "Securities Exchange Act" means the Securities Exchange Act of 1934, as
amended, together with the rules and regulations promulgated thereunder.

    "Special Partnership Transaction" means the statutory merger or interest
exchange between CapRock Telecommunications Corp. and CapRock Fiber Network,
LTD. that would be required to be consummated in the event the Special Offer to
Purchase is made and any CapRock notes remain outstanding after the payment of
all CapRock notes tendered in such Special Offer to Purchase.

    "Stated Maturity" means (i) with respect to any debt security, the date
specified in such debt security as the fixed date on which the final installment
of principal of such debt security is due and payable and (ii) with respect to
any scheduled installment of principal of or interest on any debt security, the
date specified in such debt security as the fixed date on which such installment
is due and payable.

    "Subsidiary" means, with respect to any Person, any corporation, association
or other business entity of which more than 50% of the voting power of the
outstanding Voting Stock is owned, directly or indirectly, by such Person and
one or more other Subsidiaries of such Person.

    "Subsidiary Guarantee" has the meaning given it under the caption
"Limitation on Issuances of Guarantees by Restricted Subsidiaries."

    "Telecommunications Assets" means, with respect to any Person, assets
(including, without limitation, rights of way, trademarks and licenses) that are
utilized by such Person, directly or indirectly, in the Telecommunications
Business and including any computer systems used in a Telecommunications
Business. Telecommunications Assets shall also include a majority of the Voting
Stock of another Person, if such Voting Stock is acquired by CapRock or a
Restricted Subsidiary and all or substantially all the assets of such other
Person comprise Telecommunications Assets; and such other Person either is, or
immediately following the relevant transaction shall become, a Restricted
Subsidiary of CapRock pursuant to the CapRock indenture. The determination of
what constitutes Telecommunications Assets shall be made by the Board of
Directors of CapRock and evidenced by a Board Resolution delivered to the
trustee.

    "Telecommunications Business" means the business of (i) transmitting or
providing services relating to the transmission of voice, video, signals, data
or Internet services; (ii) constructing, creating, developing, owning,
operating, and marketing one or more communications networks, related, ancillary
or complementary network transmission equipment, information systems, software,
and other related, ancillary or complimentary assets and devices; (iii)
planning, designing, and consulting with respect to the matters described in
clauses (i) and (ii); and (iv) evaluating, participating and pursuing any other
activity or opportunity that is related, ancillary, or complementary to those
identified in clauses (i), (ii) and (iii) above, as determined in good faith by
the Board of Directors of CapRock.

    "Temporary Cash Investment" means any of the following:

    (i) direct obligations of the United States of America or any agency thereof
or obligations fully and unconditionally guaranteed by the United States of
America or any agency thereof with a maturity of 365 days or less,

    (ii) time deposit accounts, certificates of deposit and money market
deposits maturing within one year of the date of acquisition thereof issued by a
bank or trust company which is organized under the laws of the United States of
America, any state thereof or any foreign country recognized by the

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United States of America, and which bank or trust company has capital, surplus
and undivided profits aggregating in excess of $50 million (or the foreign
currency equivalent thereof) and has outstanding debt which is rated "A" (or
such similar equivalent rating) or higher by at least one nationally recognized
statistical rating organization (as defined in Rule 436 under the Securities
Act) or any money-market fund sponsored by a registered broker dealer or mutual
fund distributor,

    (iii) repurchase obligations with a term of not more than 30 days for
underlying securities of the types described in clause (i) above entered into
with a bank meeting the qualifications described in clause (ii) above,

    (iv) commercial paper, maturing not more than one year after the date of
acquisition, issued by a corporation (other than an Affiliate of CapRock)
organized and in existence under the laws of the United States of America, any
state thereof or any foreign country recognized by the United States of America
with a rating at the time as of which any investment therein is made of "P-1"
(or higher) according to Moody's Investors Service, Inc. or "A-1" (or higher)
according to Standard & Poor's Ratings Service, and

    (v) securities with maturities of six months or less from the date of
acquisition issued or fully and unconditionally guaranteed by any state,
commonwealth or territory of the United States of America, or by any political
subdivision or taxing authority thereof, and rated at least "A" by Standard &
Poor's Ratings Service or Moody's Investors Service, Inc.

    "Trade Payables" means, with respect to any Person, any accounts payable or
any other indebtedness or monetary obligation to trade creditors created,
assumed or Guaranteed by such Person or any of its Subsidiaries arising in the
ordinary course of business in connection with the acquisition of goods or
services.

    "Transaction" means the transactions contemplated by the Merger Agreement
(also referred to herein from time to time as the Combination).

    "Transition Period" means the period between the Closing Date and the
consummation of the Transaction or the payment date for CapRock notes tendered
in the Special Offer to Purchase, as the case may be.

    "Unrestricted Subsidiary" means (a) any Subsidiary that at the time of
determination shall be an Unrestricted Subsidiary (as designated by the Board of
Directors of CapRock, as provided below) and (b) any Subsidiary of an
Unrestricted Subsidiary. The Board of Directors of CapRock may designate any
Subsidiary (including any newly acquired or newly formed Subsidiary) to be an
Unrestricted Subsidiary so long as (i) neither CapRock nor any other Subsidiary
is directly or indirectly liable for any Indebtedness of such Subsidiary, (ii)
no default with respect to any Indebtedness of such Subsidiary would permit
(upon notice, lapse of time or otherwise) any holder of any other Indebtedness
of CapRock or any Restricted Subsidiary to declare a default on such other
Indebtedness or cause the payment thereof to be accelerated or payable prior to
its Stated Maturity, (iii) any Investment in such Subsidiary made as a result of
designating such Subsidiary an Unrestricted Subsidiary will not violate the
provisions of the "Limitation on Restricted Payments" covenant, (iv) neither
CapRock nor any Restricted Subsidiary has a contract, agreement, arrangement,
understanding or obligation of any kind, whether written or oral, with such
Subsidiary on terms more favorable to such Subsidiary than those that might be
obtained at the time from persons who are not Affiliates of CapRock, and
(v) neither CapRock nor any other Subsidiary has any obligation (1) to subscribe
for additional shares of Capital Stock or other equity interests in such
Subsidiary, or (2) to maintain or preserve such Subsidiary's financial condition
or to cause such Subsidiary to achieve certain levels of operating results. Any
such designation by the Board of Directors of CapRock shall be evidenced to the
trustee by filing a Board Resolution with the trustee giving effect to such
designation. The Board of Directors of CapRock may designate any Unrestricted
Subsidiary as a Restricted Subsidiary if, immediately after giving effect to

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such designation, there would be no Default or Event of Default under the
CapRock indenture and CapRock could incur $1.00 of additional Indebtedness under
clause (i) of the first paragraph of the "Limitation on Indebtedness" covenant
described above pursuant to the "Limitation on Indebtedness" covenant.

    "Vendor Credit Facility" means any agreement entered into with one or more
vendors, suppliers or lessors of telecommunications equipment or assets
(including any agreement entered into with any such vendor, supplier or lessor
or any financial institution acting on behalf of any such vendor, supplier or
lessor) in order to finance the acquisition or construction of
telecommunications equipment or assets, as such agreement may be amended,
modified, supplemented, refunded, refinanced, restructured, renewed or replaced
from time to time; PROVIDED THAT (i) any equipment or other assets acquired or
leased under or pursuant to such Vendor Credit Facility are received by CapRock
or a Restricted Subsidiary and (ii) all obligations with respect to or under
such Vendor Credit Facility or any amendment, modification, supplement,
refunding, refinancing, restructuring, renewal or replacement thereof are owed,
whether directly or indirectly as the case may be, to a Person who is not an
Affiliate of CapRock or any of its Subsidiaries and no such Affiliate shall act
as a facilitator or conduit or in a similar capacity with respect thereto.

    "Voting Stock" means with respect to any Person, Capital Stock of any class
or kind ordinarily having the power to vote for the election of directors,
managers or other voting members of the governing body of such Person.

    "Wholly-Owned" means, with respect to any Subsidiary of any Person, the
ownership of all of the outstanding Capital Stock of such Subsidiary (other than
any director's qualifying shares or Investments by foreign nationals or other
shares issued to Persons as mandated by applicable law) by such Person or one or
more Wholly-Owned Subsidiaries of such Person.

BOOK-ENTRY; DELIVERY AND FORM

    The CapRock notes are represented by one or more permanent global
certificates in definitive, fully registered form. This global note was
deposited upon issuance with The Depository Trust Company, New York, New York
and registered in the name of a nominee of The Depository Trust Company.

THE GLOBAL NOTE

    Pursuant to procedures established by The Depository Trust Company,

    (1) upon the issuance of the global note, The Depository Trust Company or
its custodian credited, on its internal system, the principal amount of the
individual beneficial interests represented by the global note to the respective
accounts of persons who have accounts with such depositary and

    (2) ownership of beneficial interests in the global note is shown on, and
the transfer of ownership will be effected only through, records maintained by
The Depository Trust Company or its nominee, with respect to interests of
participants, and the records of participants, with respect to interests of
persons other than participants.

    Ownership of beneficial interests in the global notes is limited to persons
who have accounts with The Depository Trust Company or persons who hold
interests through participants.

    So long as The Depository Trust Company or its nominee is the registered
owner or holder of the CapRock notes, The Depository Trust Company (or the
nominee) will be considered the sole owner or holder of the CapRock notes
represented by the global note for all purposes under the CapRock indenture. No
beneficial owner of an interest in the global note will be able to transfer that
interest except in accordance with The Depository Trust Company's procedures.

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    Payments of interest, principal and other amounts due on the global note are
made to The Depository Trust Company or its nominee as the registered owner.
None of CapRock, the trustee or any paying agent has any responsibility or
liability for any aspect of the records relating to or payments made on account
of beneficial ownership interests in the global note or for maintaining,
supervising or reviewing any records relating to this beneficial ownership
interest.

    We expect that The Depository Trust Company or its nominee, upon receipt of
any payment of interest, principal or other amounts due on the global note, will
credit participants' accounts with payments in amounts proportionate to their
respective beneficial interests in the global note as shown on the records of
The Depository Trust Company. We also expect that payments by participants to
owners of beneficial interests in the global note held through such participants
will be governed by standing instructions and customary practice, as is the case
with securities held for the accounts of customers registered in the names of
nominees for those customers. These payments will be the responsibility of the
participants.

    Transfers between participants in The Depository Trust Company are effected
in the ordinary way through The Depository Trust Company's settlement system in
accordance with The Depository Trust Company rules and are settled in same day
funds.

    The Depository Trust Company has advised us that it will take any action
permitted to be taken by a holder of CapRock notes, including the presentation
of CapRock notes for exchange as described below, only at the direction of a
participant to whose account The Depository Trust Company interests in the
global note are credited. Further, The Depository Trust Company will take action
only as to such portion of the CapRock notes as to which the participant has
given such direction. However, if there is an Event of Default under the CapRock
indenture, The Depository Trust Company will exchange the global note for
certificated notes, which it will distribute to its participants.

    The Depository Trust Company has advised us as follows: The Depository Trust
Company is a limited purpose trust company organized under the laws of the State
of New York, a member of the Federal Reserve System, a "clearing corporation"
within the meaning of the Uniform Commercial Code and a "Clearing Agency"
registered under the provisions of Section 17A of the Exchange Act. The
Depository Trust Company was created to hold securities for its participants and
facilitate the clearance and settlement of securities transactions between
participants through electronic book-entry changes in accounts of its
participants, thereby eliminating the need for physical movement of
certificates. Participants include securities brokers and dealers, banks, trust
companies and clearing corporations and certain other organizations. Indirect
access to The Depository Trust Company system is available to others such as
banks, brokers, dealers and trust companies that clear through or maintain a
custodial relationship with a participant, either directly or indirectly.

    Although The Depository Trust Company has agreed to the foregoing procedures
in order to facilitate transfers of interests in the global note among
participants of The Depository Trust Company, it is under no obligation to
perform those procedures, and those procedures may be discontinued at any time.
Neither CapRock nor the trustee will have any responsibility for the performance
by The Depository Trust Company or its participants or indirect participants of
their respective obligations under the rules and procedures governing their
operations.

CERTIFICATED SECURITIES

    If (1) The Depository Trust Company is at any time unwilling or unable to
continue as a depositary for the global note and a successor depositary is not
appointed by CapRock within 90 days or (2) an Event of Default under the CapRock
indenture has occurred and is continuing with respect to the CapRock notes,
certificated notes will be issued in exchange for the global note.

                                      126
<PAGE>
THE PROPOSED AMENDMENTS

    On October 11, 2000, CapRock commenced a solicitation of consents from the
holders of the CapRock notes to amend the CapRock indenture as summarized below.
As of October 27, 2000, CapRock had received consents from holders of a majority
of the aggregate principal amount of the CapRock notes to such amendments.
CapRock expects shortly to amend the indenture as summarized below. Capitalized
terms used below that are not otherwise defined below shall have the meanings
assigned to them in the CapRock indenture.

    The proposed amendments amend the CapRock indenture to permit a merger of
CapRock with McLeodUSA or any wholly-owned subsidiary of McLeodUSA and to allow
the merger to be consummated without triggering the change of control provisions
of the CapRock indenture. We refer to these amendments as the Merger Amendments.

    Except for the amendment to Section 5.01(c) which is more particularly
described below, the proposed amendments would also eliminate in their entirety
from the CapRock indenture the following covenants and the references to such
covenants, as well as the events of default and definitions related solely to
such covenants. We refer to these amendments as the Covenant Amendments. The
Covenant Amendments replace the text of each of the following articles, sections
or subsections of the CapRock indenture with the words "Intentionally Omitted:"

<TABLE>
<S>                             <C>
SECTION 5.01(C)...............  EVENTS OF DEFAULT. Defines an "Event of Default" to include
                                a default in the performance or breach of the provisions of
                                Article 8 or the failure to make or consummate an Offer to
                                Purchase in accordance with Section 10.10, Section 10.15 or
                                Section 10.21. Section 5.01(c) is being amended to remove
                                the references to Article 8, Section 10.10 and Section
                                10.15. The reference to Section 10.21 in the CapRock
                                indenture remains.

SECTION 7.04..................  REPORTS BY ISSUER. Requires CapRock to file annual and
                                quarterly reports and other required documents with the SEC,
                                to provide copies of such reports and documents to the
                                Trustee and to provide summaries of certain reports and
                                documents to the Holders.

ARTICLE 8.....................  CONSOLIDATION, MERGER, SALE OF ASSETS, ETC. Prohibits
                                CapRock from consolidating, merging, selling or otherwise
                                transferring all or substantially all of its assets unless
                                certain conditions are met.

SECTION 10.04.................  CORPORATE EXISTENCE. Requires CapRock to maintain the
                                corporate existence, rights, licenses and franchises of
                                CapRock and its Restricted Subsidiaries.

SECTION 10.05.................  PAYMENT OF TAXES AND OTHER CLAIMS. Requires CapRock to pay
                                or discharge all material taxes, assessments and
                                governmental charges levied or imposed on CapRock or any of
                                its Restricted Subsidiaries before such taxes, assessments
                                and governmental charges become delinquent.

SECTION 10.06.................  MAINTENANCE OF PROPERTIES. Requires CapRock to cause all
                                material properties owned, or used or held for use in the
                                conduct of business, by CapRock or any of its Restricted
                                Subsidiaries to be maintained and kept in good condition.
</TABLE>

                                      127
<PAGE>
<TABLE>
<S>                             <C>
SECTION 10.07.................  INSURANCE. Requires CapRock to insure all of its and its
                                Restricted Subsidiaries' properties against loss or damage
                                to the extent that property of similar character is usually
                                and customarily insured.

SECTION 10.10.................  REPURCHASE OF CAPROCK NOTES UPON A CHANGE OF CONTROL.
                                Requires CapRock to offer to purchase the CapRock notes
                                governed by the CapRock indenture within 30 days of a
                                "Change of Control," at a price equal to 101% of the unpaid
                                principal amount of the CapRock notes, plus accrued and
                                unpaid interest.

SECTION 10.11.................  LIMITATION ON INDEBTEDNESS. Restricts the ability of CapRock
                                and its Restricted Subsidiaries to incur, directly or
                                indirectly, Indebtedness.

SECTION 10.13.................  LIMITATION ON RESTRICTED PAYMENTS. Restricts the ability of
                                CapRock and its Restricted Subsidiaries to make Restricted
                                Payments, including payment of dividends on or purchases of
                                CapRock's Capital Stock, purchases of subordinated
                                indebtedness or making Investments.

SECTION 10.14.................  LIMITATION ON TRANSACTIONS WITH STOCKHOLDERS AND AFFILIATES.
                                Restricts the ability of CapRock and its Restricted
                                Subsidiaries to enter into or suffer to exist any
                                transaction with any of their respective Affiliates (except
                                for transactions solely between CapRock and any of its
                                Wholly-Owned Restricted Subsidiaries or solely between
                                Wholly-Owned Restricted Subsidiaries) or any holder of 5% or
                                more of the Capital Stock of CapRock.

SECTION 10.15.................  LIMITATION ON ASSET SALES. Restricts the ability of CapRock
                                and its Restricted Subsidiaries to sell, transfer or lease
                                capital stock of Restricted Securities, assets of CapRock or
                                Restricted Subsidiaries which constitute all or
                                substantially all of an operating unit or business and other
                                property of CapRock or a Restricted Subsidiary outside the
                                ordinary course of business.

SECTION 10.16.................  LIMITATION ON LIENS. Restricts the ability of CapRock and
                                its Restricted Subsidiaries to create, incur, assume or
                                suffer to exist any Liens of any kind against or upon any
                                property or assets of CapRock or any Restricted Subsidiary
                                or any shares of Capital Stock or Indebtedness of any
                                Restricted Subsidiary.

SECTION 10.18.................  LIMITATION ON THE ISSUANCE AND SALE OF CAPITAL STOCK OF
                                RESTRICTED SUBSIDIARIES. Restricts the ability of CapRock to
                                sell or otherwise convey or dispose of any Capital Stock of
                                a Restricted Subsidiary and restricts the ability of
                                CapRock's Restricted Subsidiaries to issue, sell or
                                otherwise convey or dispose of any of their Capital Stock.

SECTION 10.19.................  LIMITATION ON DIVIDEND AND OTHER PAYMENT RESTRICTIONS
                                AFFECTING RESTRICTED SUBSIDIARIES. Restricts the ability of
                                CapRock and its Restricted Subsidiaries to limit any
                                Restricted Subsidiary's ability to pay dividends, to pay
                                Indebtedness owed to CapRock or any Restricted Subsidiary,
                                to make loans or advances to CapRock or any Restricted
                                Subsidiary, or to transfer any of its properties to CapRock
                                or to the other Restricted Subsidiaries.
</TABLE>

                                      128
<PAGE>
<TABLE>
<S>                             <C>
SECTION 10.20.................  LIMITATION ON SALE-LEASEBACK TRANSACTIONS. Restricts the
                                ability of CapRock and its Restricted Subsidiaries to enter
                                into any sale-leaseback transaction involving any of its
                                assets or properties unless certain conditions are met.

SECTION 10.22.................  COMMISSION REPORTS AND REPORTS TO HOLDERS. Requires CapRock
                                to file annual and quarterly reports and other required
                                documents with the SEC and to provide copies of such reports
                                and documents to the Trustee and the Holders.

SECTION 10.23.................  LIMITATION ON ISSUANCES OF GUARANTEES BY RESTRICTED
                                SUBSIDIARIES. Limits the ability of CapRock's Restricted
                                Subsidiaries to guarantee any indebtedness of CapRock unless
                                such Restricted Subsidiary also guarantees CapRock's
                                obligations under the CapRock notes.
</TABLE>

    The Merger Amendments will become effective upon execution by CapRock and
the trustee of a supplemental indenture. The Covenant Amendments will become
effective upon (a) execution by CapRock and the trustee of a supplemental
indenture and (b) the later of (i) the effective time of the merger of CapRock
with a wholly-owned subsidiary of McLeodUSA and (ii) 20 business days following
commencement of the exchange offer. The form of the supplemental indenture which
embodies the proposed amendments has been filed as an exhibit to the
registration statement of which this prospectus forms a part, and is considered
a part of this document.

                                      129
<PAGE>
                                 LEGAL MATTERS

    The legality of the McLeodUSA notes offered by this prospectus is being
passed upon for McLeodUSA by Hogan & Hartson L.L.P., Washington, D.C., special
counsel for McLeodUSA.

                                    EXPERTS

    The consolidated financial statements and schedule of McLeodUSA and
subsidiaries as of December 31, 1999 and 1998, and for each of the three years
ended December 31, 1999, incorporated by reference in this registration
statement have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their reports with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in giving said reports.

    The consolidated financial statements of Splitrock Services, Inc. as of
December 31, 1999 and 1998, and for the period from March 5, 1997 (date of
inception) to December 31, 1997 and for each of the two years in the period
ended December 31, 1999 included in this registration statement have been
audited by Arthur Andersen LLP, independent public accountants, as indicated in
their report with respect thereto, and are included in reliance upon the
authority of said firm as experts in giving said reports.

    The consolidated financial statements of CapRock Communications Corp. as of
December 31, 1998 and 1999 and for each of the years in the three-year period
ended December 31, 1999 are incorporated by reference in this registration
statement in reliance upon the report of KPMG LLP, independent certified public
accountants, incorporated by reference herein, and upon the authority of said
firm as experts in accounting and auditing.

                                      130
<PAGE>
                      WHERE YOU CAN FIND MORE INFORMATION

    We have filed a registration statement with the SEC of which this prospectus
forms a part. The registration statement, including the attached exhibits and
schedules, contains additional relevant information about the McLeodUSA notes.
The rules and regulations of the SEC allow us to omit some of the information
included in the registration statement from this prospectus.

    In addition, both McLeodUSA and CapRock have filed reports, proxy statements
and other information with the SEC under the Securities Exchange Act. You may
read and copy any of this information at the following locations of the SEC:

<TABLE>
<S>                            <C>                            <C>
   Public Reference Room         New York Regional Office        Chicago Regional Office
   450 Fifth Street, N.W.          7 World Trade Center              Citicorp Center
         Room 1024                      Suite 1300               500 West Madison Street
   Washington, D.C. 20549        New York, New York 10048              Suite 1400
                                                              Chicago, Illinois 60661-2511
</TABLE>

    You may obtain information on the operation of the SEC's Public Reference
Room by calling the SEC at 1-800-SEC-0330.

    The SEC also maintains an Internet Web site that contains reports, proxy
statements and other information regarding issuers, like McLeodUSA and CapRock,
that file electronically with the SEC. The address of that site is
http://www.sec.gov. The SEC file number for McLeodUSA's documents filed under
the Securities Exchange Act is 0-20763, and the SEC file number for CapRock's
documents filed under the Securities Exchange Act is 0-24581.

    The SEC allows us to "incorporate by reference" information into this
prospectus. This means we can disclose important information to you by referring
you to another document filed separately with the SEC. The information
incorporated by reference is considered to be a part of this prospectus, except
for any such information that is superseded by information included directly in
this document.

    This prospectus incorporates by reference the documents listed below that we
have previously filed or will file with the SEC. They contain important
information about us and our financial condition.

    - Our Annual Report on Form 10-K for our fiscal year ended December 31,
      1999, filed on March 30, 2000

    - Our Quarterly Reports on Form 10-Q for our quarterly periods ended
      March 31, 2000 and June 30, 2000, filed on May 15, 2000 and August 14,
      2000, respectively

    - Our Current Reports on Form 8-K filed on January 19, 2000, January 21,
      2000, February 3, 2000, February 11, 2000, March 14, 2000, April 14, 2000,
      May 24, 2000, June 1, 2000, October 13, 2000 and October 27, 2000, and our
      amended Current Report on Form 8-K/A filed on June 13, 2000

    - All documents filed with the SEC by us under Sections 13(a), 13(c), 14 and
      15(d) of the Securities Exchange Act after the date of this prospectus and
      before the offering is terminated, are considered to be a part of this
      prospectus, effective the date such documents are filed

    This prospectus also incorporates by reference the documents listed below
that CapRock has previously filed or will file with the SEC. They contain
important information about CapRock and its financial condition.

    - CapRock's Annual Report on Form 10-K for its fiscal year ended December
      31, 1999, filed on March 30, 2000

                                      131
<PAGE>
    - CapRock's Quarterly Reports on Form 10-Q for CapRock's quarterly periods
      ended March 31, 2000 and June 30, 2000, filed on May 15, 2000 and August
      14, 2000, respectively

    - CapRock's Current Reports on Form 8-K filed on April 20, 2000, July 10,
      2000 (two), August 3, 2000, August 16, 2000 and October 10, 2000

    - All documents filed with the SEC by CapRock under Sections 13(a), 13(c),
      14 and 15(d) of the Securities Exchange Act after the date of this
      prospectus and before the offering is terminated are considered to be a
      part of this prospectus, effective the date such documents are filed

    In the event of conflicting information in these documents, the information
in the latest filed document should be considered correct.

    You can obtain any of the documents listed above from the SEC, through the
SEC's Internet Web site at the address described above, or directly from us, by
requesting them in writing or by telephone at the following address:

                             McLeodUSA Incorporated
                           McLeodUSA Technology Park
                        6400 C Street SW, P.O. Box 3177
                          Cedar Rapids, IA 52406-3177
                             Attn: General Counsel
                            Telephone (319) 790-7775

    We will provide a copy of any of these documents without charge, excluding
any exhibits to them unless the exhibit is specifically listed as an exhibit to
the registration statement of which this prospectus forms a part. If you request
any documents from us, we will mail them to you by first class mail, or another
equally prompt means, within two business days after we receive your request.
You should make your request at least five business days prior to the expiration
of the exchange offer in order to ensure timely delivery of these documents
before the exchange offer expires.

    The indenture that will govern the McLeodUSA notes requires us to furnish
the trustee with annual reports containing consolidated financial statements
audited by our independent public accountants and with quarterly reports
containing unaudited condensed consolidated financial statements for each of the
first three quarters of each fiscal year.

    All information contained in or considered a part of this prospectus
relating to McLeodUSA has been supplied by McLeodUSA, and all such information
relating to CapRock has been supplied by CapRock.

                                      132
<PAGE>
                            SPLITROCK SERVICES, INC.

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
FINANCIAL STATEMENTS:
  Report of Independent Accountants.........................    F-2
  Consolidated Balance Sheets as of December 31, 1998 and
    1999....................................................    F-3
  Consolidated Statements of Operations and Comprehensive
    Loss for the Period from Inception (March 5, 1997)
    Through December 31, 1997 and the years ended December
    31, 1998 and 1999.......................................    F-4
  Consolidated Statements of Stockholders' Equity (Deficit)
    for the Period from Inception (March 5, 1997) Through
    December 31, 1999.......................................    F-5
  Consolidated Statements of Cash Flows for the Period from
    Inception (March 5, 1997) Through December 31, 1997 and
    the years ended December 31, 1998 and 1999..............    F-6
  Notes to Consolidated Financial Statements................    F-7
</TABLE>

                                      F-1
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholder of
Splitrock Services, Inc.:

We have audited the accompanying consolidated balance sheets of Splitrock
Services, Inc. and subsidiary as of December 31, 1999 and 1998, and the related
consolidated statements of operations and comprehensive loss, stockholders'
equity, and cash flows for the period from inception (March 5, 1997) to December
31, 1997 and for each of the two years in the period ended December 31, 1999.
These financial statements are the responsibility of Splitrock Services, Inc.'s
management. Our responsibility is to express an opinion on these financial
statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to obtain reasonable assurance about whether the financial statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the financial position of Splitrock Services,
Inc. and subsidiary as of December 31, 1999 and 1998, and the results of their
operations and their cash flows for the period from inception (March 5, 1997) to
December 31, 1997 and for each of the two years in the period ended
December 31, 1999 in conformity with accounting principles generally accepted in
the United States.

                                          ARTHUR ANDERSEN LLP

Chicago, Illinois
October 16, 2000

                                      F-2
<PAGE>
                            SPLITROCK SERVICES, INC.

                          CONSOLIDATED BALANCE SHEETS

               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                              --------------------
                                                                1998       1999
                                                              --------   ---------
<S>                                                           <C>        <C>
                           ASSETS
Current assets:
  Cash and cash equivalents.................................  $ 28,330   $  92,593
  Unrestricted investments -- short term....................   120,475       5,441
  Restricted investments -- short term......................    39,476      33,646
  Accounts receivable, net of $537 and $1,403 allowance in
    1998 and 1999, respectively.............................     3,205      11,292
  Prepaid expenses and other current assets.................       480       2,975
                                                              --------   ---------
      Total current assets..................................   191,966     145,947
                                                              --------   ---------
Restricted investments -- long term.........................    19,001         140
Deposits....................................................       270      11,910
Property and equipment, net.................................    73,899     120,863
Intangibles, net............................................    11,005      22,426
                                                              --------   ---------
                                                              $296,141   $ 301,286
                                                              ========   =========

           LIABILITIES AND STOCKHOLDERS' DEFICIT

Current liabilities:
  Current maturities of capital lease obligations...........  $  9,121   $  21,089
  Accounts payable..........................................    21,582       2,906
  Accrued interest payable..................................    13,375      14,141
  Accrued liabilities.......................................    15,894      31,013
                                                              --------   ---------
      Total current liabilities.............................    59,972      69,149
Senior notes payable ($261,000 face value net of unamortized
  discount )................................................   258,217     258,387
Capital lease obligations...................................     8,243      18,934
                                                              --------   ---------
      Total liabilities.....................................   326,432     346,470
Commitments and contingencies
Stockholders' deficit:
  Preferred stock, $.001 par value, 25,000,000 shares
    authorized, no shares issued............................        --          --
  Common stock, $.001 par value, 150,000,000 shares
    authorized, 46,624,845 and 57,030,590 shares issued and
    outstanding as of December 31, 1998 and 1999,
    respectively............................................        47          57
  Common stock warrants.....................................     2,849       1,750
  Additional paid-in capital................................    34,717     124,461
  Accumulated other comprehensive income (loss).............        47        (180)
  Accumulated deficit.......................................   (67,951)   (171,272)
                                                              --------   ---------
      Total stockholders' deficit...........................   (30,291)    (45,184)

                                                              $296,141   $ 301,286
                                                              ========   =========
</TABLE>

  THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONSOLIDATED FINANCIAL
                                  STATEMENTS.

                                      F-3
<PAGE>
                            SPLITROCK SERVICES, INC.

          CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                          PERIOD FROM
                                                           INCEPTION
                                                        (MARCH 5, 1997)    YEAR ENDED     YEAR ENDED
                                                        TO DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                             1997             1998           1999
                                                        ---------------   ------------   ------------
<S>                                                     <C>               <C>            <C>
Revenue...............................................    $   22,708       $   63,611     $   89,556
Operating expenses:
  Splitrock network costs.............................         2,362           32,912         87,398
  Legacy network costs................................        25,804           58,292         31,904
  Selling, general and administrative.................         1,276            6,390         21,386
  Depreciation and amortization.......................         3,500           13,850         27,322
                                                          ----------       ----------     ----------
                                                              32,942          111,444        168,010
                                                          ----------       ----------     ----------
Loss from operations..................................       (10,234)         (47,833)       (78,454)
Other income (expense):
  Interest income.....................................           348            5,393          7,714
  Interest expense....................................          (235)         (15,390)       (32,581)
                                                          ----------       ----------     ----------
Loss before income taxes..............................       (10,121)         (57,830)      (103,321)
Provision for income taxes............................            --               --             --
                                                          ----------       ----------     ----------
Net loss..............................................       (10,121)         (57,830)      (103,321)
Other comprehensive income (loss):
  Unrealized gain (loss) on securities................            --               47           (180)
                                                          ----------       ----------     ----------
Comprehensive loss....................................    $  (10,121)      $  (57,783)    $ (103,501)
                                                          ==========       ==========     ==========
Net loss per share--basic and diluted.................    $    (0.42)      $    (1.30)    $    (2.03)
                                                          ==========       ==========     ==========
Weighted average shares--basic and diluted............    24,109,823       44,388,948     50,866,855
                                                          ==========       ==========     ==========
</TABLE>

  THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONSOLIDATED FINANCIAL
                                  STATEMENTS.

                                      F-4
<PAGE>
                            SPLITROCK SERVICES, INC.

           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)

        PERIOD FROM INCEPTION (MARCH 5, 1997) THROUGH DECEMBER 31, 1999

               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                              COMMON STOCK                                 ACCUMULATED
                                          ---------------------    COMMON    ADDITIONAL       OTHER
                                                         PAR       STOCK      PAID-IN     COMPREHENSIVE   ACCUMULATED
                                            SHARES      VALUE     WARRANTS    CAPITAL     INCOME (LOSS)     DEFICIT       TOTAL
                                          ----------   --------   --------   ----------   -------------   -----------   ---------
<S>                                       <C>          <C>        <C>        <C>          <C>             <C>           <C>
Initial capitalization..................  15,764,000     $16      $    --     $     12        $  --        $      --    $      28
  Issuance of Common Stock for cash of
    $1.11 per share and warrant.........  18,466,400      18           --       20,482           --               --       20,500
  Conversion of note payable to Common
    Stock at $1.11 per share............   9,008,000       9           --        9,991           --               --       10,000
  Net loss..............................          --      --           --           --           --        $ (10,121)     (10,121)
                                          ----------     ---      -------     --------        -----        ---------    ---------
Balance at December 31, 1997............  43,238,400      43           --       30,485           --          (10,121)      20,407
  Unrealized gain on securities.........          --      --           --           --           47               --           47
  Issuance of warrants to purchase
    1,487,791 shares of Common Stock in
    connection with Senior Notes (Note
    5)..................................          --      --        2,849           --           --               --        2,849
  Exercise of stock options and
    Warrant.............................   3,386,445       4           --        4,232           --               --        4,236
  Net loss..............................          --      --           --           --           --          (57,830)     (57,830)
                                          ----------     ---      -------     --------        -----        ---------    ---------
Balance at December 31, 1998............  46,624,845      47        2,849       34,717           47          (67,951)     (30,291)
  Unrealized loss on securities.........          --      --           --           --         (227)              --         (227)
  Exercise of stock options and
    warrants............................     713,117       1       (1,099)       1,322           --               --          224
  Sale of Common Stock under public
    offering, net of expenses...........   9,692,628       9           --       88,422           --               --       88,431
  Net loss..............................          --      --           --           --           --         (103,321)    (103,321)
                                          ----------     ---      -------     --------        -----        ---------    ---------
Balance at December 31, 1999............  57,030,590     $57      $ 1,750     $124,461        $(180)       $(171,272)   $ (45,184)
                                          ==========     ===      =======     ========        =====        =========    =========
</TABLE>

  THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONSOLIDATED FINANCIAL
                                  STATEMENTS.

                                      F-5
<PAGE>
                            SPLITROCK SERVICES, INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                PERIOD FROM      INCEPTION
                                                              (MARCH 5, 1997)    YEAR ENDED     YEAR ENDED
                                                              TO DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                                   1997             1998           1999
                                                              ---------------   ------------   ------------
<S>                                                           <C>               <C>            <C>
Cash flows from operating activities:
  Net loss..................................................      $(10,121)       $(57,830)     $(103,321)
  Adjustments to reconcile net loss to net cash used in
    operating activities:
    Depreciation and amortization...........................         3,500          13,850         27,322
    Amortization of debt discount and deferred financing
      costs.................................................            --             467          1,114
  Changes in assets and liabilities:
    (Increase) decrease in accounts receivable..............        (4,252)          1,047         (8,087)
    Increase in prepaid and other current assets............          (221)           (259)        (2,495)
    Increase (decrease) in accounts payable and accrued
      liabilities...........................................         8,861          28,615         (3,557)
    Increase in accrued interest payable....................            --          13,375            766
                                                                  --------        --------      ---------
    Net cash used in operating activities...................        (2,233)           (735)       (88,258)
                                                                  --------        --------      ---------
Cash flows from investing activities:
  Purchase of equipment.....................................       (16,969)        (45,261)       (39,464)
  (Purchase) liquidation of unrestricted investments........            --        (119,462)       114,807
  Reinvestment of interest earned on unrestricted
    investments.............................................            --            (966)            --
  Reinvestment of interest earned on restricted
    investments.............................................            --          (1,725)        28,194
  Increase in deposits......................................          (229)            (41)       (11,640)
  Increase in intangibles...................................            --          (2,057)       (12,509)
                                                                  --------        --------      ---------
    Net cash provided by (used in)investing activities......       (17,198)       (169,512)        79,388
Cash flows from financing activities:
  Proceeds from initial public offering, net of offering
    costs...................................................            --              --         88,422
  Proceeds from senior notes payable and warrants issued....            --         261,000             --
  Proceeds from notes payable to stockholder................        11,750          10,000             --
  Repayments of notes payable to stockholder................          (750)        (11,000)            --
  Proceeds from notes payable...............................            --           1,477             --
  Repayments of notes payable...............................            --          (1,477)            --
  Financing costs incurred..................................            --          (9,501)        (2,079)
  Restriction of cash under senior note agreement...........            --         (56,752)            --
  Sale of common stock and exercise of stock options and
    warrants................................................        20,528           4,236            224
  Proceeds from sale-leaseback of equipment.................         1,152             960             --
  Principal payments on capital lease obligations...........        (2,067)        (11,548)        (9,931)
  Restriction of cash under credit agreement................        (3,472)          3,472         (3,503)
                                                                  --------        --------      ---------
    Net cash provided by financing activities...............        27,141         190,867         73,133
                                                                  --------        --------      ---------
Increase in cash and cash equivalents.......................         7,710          20,620         64,263
Cash and cash equivalents:
  Beginning of period.......................................            --           7,710         28,330
                                                                  --------        --------      ---------
  End of period.............................................      $  7,710        $ 28,330      $  92,593
                                                                  ========        ========      =========
Supplemental cash flow information:
  Cash paid for interest....................................      $    235        $  1,536      $  30,679
                                                                  ========        ========      =========
Noncash investing and financing activities:
  Assumption of capital lease obligations and other
    liabilities
    (Note 2)................................................      $  5,900        $     --      $      --
                                                                  ========        ========      =========
  Capital lease obligations incurred........................      $ 20,916        $  4,792      $  32,590
                                                                  ========        ========      =========
  Conversion of note payable to stockholder into common
    stock...................................................      $ 10,000        $     --      $      --
                                                                  ========        ========      =========
  Approximately $18,400 of the increase in accounts payable
    and accrued liabilities at December 31, 1998, were
    related to equipment purchases.
</TABLE>

  THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONSOLIDATED FINANCIAL
                                  STATEMENTS.

                                      F-6
<PAGE>
                            SPLITROCK SERVICES, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

           (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    Splitrock Services, Inc. ("the Company") was formed on March 5, 1997 as a
Texas corporation and was reincorporated in Delaware on May 8, 1998. The Company
provides high-quality, nationwide telecommunication services on a flexible
multi-service platform.

    On October 29, 1999 the Company formed Splitrock Leasing, LLC, a
wholly-owned subsidiary. The accompanying consolidated financial statements
include the operations of Splitrock Leasing, LLC. Significant intercompany
accounts and transactions have been eliminated in the consolidated financial
statements.

    The Company effected a 0.563-for-1 reverse stock split of its common stock
on July 12, 1999. All share and per share amounts included in these consolidated
financial statements have been retroactively adjusted to give effect to the
reverse stock split.

    The following is a summary of the Company's significant accounting policies:

    USE OF ESTIMATES.  The preparation of the Company's consolidated financial
statements in conformity with generally accepted accounting principles requires
management to make estimates and assumptions that affect the reported amounts of
assets, liabilities, revenues and expenses, as well as disclosures of contingent
assets and liabilities. Because of inherent uncertainties in this process,
actual future results could differ from those expected at the reporting date.
Management believes the estimates are reasonable.

    CASH AND CASH EQUIVALENTS AND INVESTMENTS.  The Company considers highly
liquid investments with an original maturity of three months or less from the
date of purchase to be classified as cash and cash equivalents. Cash and cash
equivalents are stated at cost, which approximates fair value.

    Short-term investments have original maturities of more than three months
and a remaining maturity of less than one year at the date of purchase. At
December 31, 1998 and 1999, cash equivalents and short-term investments
consisted primarily of money market funds and securities of the highest grade.
All short- term investments have been classified as available for sale under the
provisions of Statement of Financial Accounting Standards No. ("SFAS") 115,
Accounting for Certain Investments in Debt and Equity Securities, and have
various maturity dates which do not exceed one year. Available for sale
securities are carried at fair value, with the unrealized gains and losses, net
of tax, reported as a separate component of stockholders' equity. The cost of
investments sold is determined on the specific identification or the first-in,
first-out method.

                                      F-7
<PAGE>
                            SPLITROCK SERVICES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

           (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    The following is a summary of the investments classified as restricted and
unrestricted as of December 31, 1998 and 1999:

<TABLE>
<CAPTION>
                                                          GROSS                 GROSS
                                                       UNREALIZED            UNREALIZED
                               AMORTIZED COST             GAINS                LOSSES              FAIR VALUE
                             -------------------   -------------------   -------------------   -------------------
                               1998       1999       1998       1999       1998       1999       1998       1999
                             --------   --------   --------   --------   --------   --------   --------   --------
<S>                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Available for sale
  securities:
  Money market funds.......  $ 23,557   $ 3,944      $ --       $ --      $  --      $  --     $ 23,557   $ 3,944
  Corporate notes..........   108,496     5,414         3         --        (80)        (3)     108,419     5,411
  Municipal securities.....    12,061        --        --         --         (6)        --       12,055        --
  U.S. Treasury notes......    34,791    30,049       181          5        (51)      (182)      34,921    29,872
                             --------   -------      ----       ----      -----      -----     --------   -------
                             $178,905   $39,407      $184       $  5      $(137)     $(185)    $178,952   $39,227
                             ========   =======      ====       ====      =====      =====     ========   =======
</TABLE>

    At December 31, 1997, restricted investments represented collateral to
support an outstanding letter of credit. Restricted investments as of December
31, 1998, represented escrowed funds that, together with interest received
thereon, will be sufficient to pay, when due, the first four semi-annual
interest payments on the Senior Notes. As of December 31, 1999, restricted
investments included $3,500 held as collateral to support outstanding letters of
credits with the remainder were held that, together with interest received
thereon, will be sufficient to pay, when due, the next two semi-annual interest
payments on the Senior Notes.

    CONCENTRATION OF CREDIT RISK.  Financial instruments which potentially
subject the Company to concentration of credit risk are primarily cash and cash
equivalents, investments and accounts receivable. The Company's cash investment
policies limit investments to short-term, investment grade instruments with
quality financial institutions. The Company's revenues and its accounts
receivable balances for the periods ended December 31, 1998 and 1999, were
largely derived from services provided to Prodigy, the Company's major customer
during the periods. Prodigy was the Company's only customer from inception
through December 31, 1997 and during 1998 and 1999 represented 99% and 85.5%,
respectively, of the Company's revenue. Management believes that the risk of
incurring material losses related to credit risks is remote.

    FAIR VALUES OF FINANCIAL INSTRUMENTS.  Due to the short-term nature of the
Company's financial instruments, management believes the carrying values of the
Company's assets, short-term liabilities and lease obligations approximate their
fair values. The fair value of the Company's Senior Notes (Note 5) at
December 31, 1999, approximates $241,000, based upon quoted market prices.

    PROPERTY AND EQUIPMENT.  Property and equipment are stated at cost. Shelters
are depreciated using the straight-line method over the estimated useful life of
twenty years. Depreciation and amortization of all other property and equipment,
including assets under capital leases, is initiated as it is placed into service
using the straight-line method over the estimated useful lives of three to ten
years from the date of installation.

    COMPUTER SOFTWARE.  Effective January 1, 1999, the Company adopted the
American Institute of Certified Public Accountants ("AICPA") Statement of
Position ("SOP") 98-1, Accounting for the Costs of Computer Software Developed
or Obtained for Internal Use. This standard requires that certain

                                      F-8
<PAGE>
                            SPLITROCK SERVICES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

           (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
costs related to the development or purchase of internal-use software be
capitalized and amortized over the estimated useful life of the software. This
SOP also requires that costs related to the preliminary project stage, data
conversion and the post-implementation/operation stage of an internal-use
computer software development project be expensed as incurred.

    DEPOSITS AND INTANGIBLES.  At December 31, 1999, deposits include $11,200
paid in connection with the fiber acquisition agreement with Level 3.
Intangibles consist primarily of debt issuance costs incurred in connection with
the issuance of our 11 3/4% Senior Notes, and other intangible assets such as
capitalized circuit charges, leasehold improvements and lease acquisition costs.
Debt issuance costs are amortized using the effective interest rate method. All
other intangibles are amortized by use of the straight-line method over their
estimated lives, which are generally two to five years. At December 31, 1998 and
1999, debt issuance costs, net of accumulated amortization, were $9,027 and
$10,183, respectively.

    LONG-LIVED ASSETS.  The Company reviews for the impairment of long-lived
assets whenever events or changes in circumstances indicate that the carrying
amount of an asset may not be recoverable. The carrying amount of a long-lived
asset is considered impaired when anticipated undiscounted cash flows expected
to result from the use of the asset and its eventual disposition are less than
its carrying amount. The Company believes that no material impairment exists at
December 31, 1999.

    INCOME TAXES.  Deferred tax assets and liabilities are determined based on
the temporary differences between the consolidated financial statement carrying
amounts and the tax bases of assets and liabilities using the enacted tax rates
in effect in the years in which the differences are expected to reverse. In
estimating future tax consequences, all expected future events are considered
with the exception of enacted changes in the tax law or rates.

    STOCK-BASED COMPENSATION.  The Company has adopted SFAS No. 123, Accounting
for Stock-Based Compensation, for disclosure purposes. Under SFAS No. 123, the
Company measures compensation expense for its stock-based employee compensation
plan using the intrinsic value method prescribed in Accounting Principles Board
("APB") No. 25, Accounting for Stock Issued to Employees. The Company provides
disclosure of the effect on net income as if the fair value-based method
prescribed in SFAS No. 123 has been applied in measuring compensation expense.

    REVENUE RECOGNITION.  The Company recognizes revenue when services are
provided and collectibility is deemed probable under its agreement with the
customer.

    LEGACY NETWORK COSTS.  Legacy network costs contain all expenses incurred in
connection with operating and decommissioning legacy networks. This includes
facility fees, line charges for legacy network POPs, certain personnel costs,
occupancy costs, equipment maintenance costs and access fees.

    COMPREHENSIVE LOSS.  Effective January 1, 1998, the Company adopted SFAS No.
130, Reporting Comprehensive Income, as displayed in its Consolidated Statements
of Operations and Comprehensive Loss for all periods presented. This SFAS
establishes standards for reporting and display of comprehensive income and its
components. The Company's comprehensive loss is comprised of net loss and
unrealized gains and losses on available for sale securities.

                                      F-9
<PAGE>
                            SPLITROCK SERVICES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

           (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    NET LOSS PER SHARE.  Basic and diluted net loss per share have been computed
in accordance with SFAS No. 128, Earnings Per Share. SFAS No. 128 requires the
Company to report both basic earnings (loss) per share, which is based on the
weighted average number of common shares outstanding, and diluted earnings
(loss) per share, which is based on the weighted average number of common shares
outstanding and all dilutive potential common shares outstanding. At December
31, 1998, options to acquire 1,801,882 shares of Common Stock at the
weighted-average exercise price of $2.31 and warrants to acquire 1,487,791
shares of Common Stock at $0.02 and at December 31, 1999, options to acquire
4,286,855 shares of Common Stock at the weighted-average exercise price of $7.78
and warrants to acquire 914,730 shares of Common Stock at an exercise price of
$0.02 were not included in the computation of diluted earnings per share because
their effect is anti-dilutive.

    SEGMENT REPORTING.  The Company conducts its business within one segment.
The Company presents its consolidated financial statements to reflect how the
"key operating decision maker" views the business and has made the appropriate
enterprise-wide disclosures in accordance with SFAS No. 131, Disclosures About
Segments of an Enterprise and Related Information.

    NEW ACCOUNTING PRONOUNCEMENTS.  In June 1998, the Financial Accounting
Standards Board ("FASB") issued SFAS No. 133 Accounting for Derivative
Instruments and Hedging Activities ("SFAS No. 133"), which is effective for
fiscal years beginning after June 15, 1999, and establishes accounting and
reporting standards for derivative instruments. In June 1999, the FASB issued
SFAS No. 137, which deferred the effective date of SFAS No. 133 to June 15,
2000. The Company has historically not engaged in derivative instrument
activity. The adoption of this standard is not expected to have a material
effect on the Company's financial position or results of operations.

    In December 1999, the SEC issued Staff Accounting Bulletin No. 101 ("SAB
101"), Revenue Recognition in Financial Statements. SAB 101 provides guidance on
applying generally accepted accounting principles to revenue recognition issues
in financial statements. The Company adopted SAB 101 as required in the first
quarter of 2000 and the adoption of this standard did not have a material effect
on its financial position or results of operations.

2. PRODIGY AGREEMENT

    On June 24, 1997, the Company entered a four-year Full Service Agreement
with Prodigy, in which the Company agreed to provide certain network services to
Prodigy from July 1, 1997 through June 30, 2001 for the lower of a price per
hour of usage or a price per subscriber as stipulated. Monthly minimum service
charges under this contract have increased from $3,000 to $4,000 and will
increase to $4,500 on July 1, 2000. Monthly maximum service charges are based on
average usage per subscriber and the number of subscribers. Prodigy may
terminate the Full Service Agreement without termination charges in an event of
default by the Company; such defaults include documented failures (without cure)
to meet certain network performance standards. The agreement also allows Prodigy
to terminate its arrangement with the Company at any time upon the payment of a
termination charge. In February 2000, the Company amended the pricing and
extended the terms under its Full Service Agreement with Prodigy (see Note 11).

                                      F-10
<PAGE>
                            SPLITROCK SERVICES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

           (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

3. PROPERTY AND EQUIPMENT

    Property and equipment consisted of the following:

<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                                          -------------------
                                                            1998       1999
                                                          --------   --------
<S>                                                       <C>        <C>
Telecommunications network equipment and shelters.......  $ 43,275   $ 76,103
Software................................................     2,186      4,352
Furniture, fixtures and office equipment................     1,749      5,429
Telecommunications network equipment under
  construction..........................................    13,289      9,982
                                                          --------   --------
                                                            60,499     95,866
Less--accumulated depreciation..........................   (10,392)   (21,884)
                                                          --------   --------
    Purchased property and equipment, net...............    50,107     73,982
                                                          --------   --------
Leased telecommunications network equipment.............    29,102     51,315
Leased Software.........................................        --      4,410
Leased office equipment.................................     1,496      1,492
                                                          --------   --------
                                                            30,598     57,217
Less--accumulated amortization..........................    (6,806)   (10,336)
                                                          --------   --------
    Leased property and equipment, net..................    23,792     46,881
                                                          --------   --------
Property and equipment, net.............................  $ 73,899   $120,863
                                                          ========   ========
</TABLE>

4. ACCRUED LIABILITIES

    Accrued liabilities consisted of the following:

<TABLE>
<CAPTION>
                                                               DECEMBER 31,
                                                            -------------------
                                                              1998       1999
                                                            --------   --------
<S>                                                         <C>        <C>
Access and transmission telecommunications line costs
  (Note 7)................................................  $ 3,172    $16,490
Telecommunications network equipment and shelters.........    9,900      8,608
Other.....................................................    2,822      5,915
                                                            -------    -------
Accrued liabilities.......................................  $15,894    $31,013
                                                            =======    =======
</TABLE>

5. INDEBTEDNESS

    The components of indebtedness are summarized as follows:

<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                                          -------------------
                                                            1998       1999
                                                          --------   --------
<S>                                                       <C>        <C>
Senior Notes, net of unamortized discount of $2,783 and
  $2,613................................................  $258,217   $258,387
                                                          --------   --------
                                                          $258,217   $258,387
                                                          ========   ========
</TABLE>

                                      F-11
<PAGE>
                            SPLITROCK SERVICES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

           (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

5. INDEBTEDNESS (CONTINUED)
    On July 24, 1998, the Company sold 261 units consisting of $261,000
principal amount of 11 3/4% Senior Notes due 2008 ("Senior Notes") and warrants
to purchase 1,487,791 shares of common stock ("the Senior Notes Offering"). Upon
issuance, the Senior Notes were recorded in the Company's consolidated financial
statements net of a $2,849 discount. The discount was attributable to the
Company's estimate of the value of the warrants based on an independent third
party valuation. The discount is amortized as a component of interest expense
over the life of the Senior Notes using the effective interest method. This
amortization will result in an increase in the consolidated financial statement
balance of the Senior Notes to a $261,000 face value by 2008. In November 1998,
the Senior Notes were exchanged for substantially the same terms in an offering
registered under the Securities Act.

    Upon the occurrence of a change of control (as defined in the Indenture for
the Senior Notes) the Company will be required to make an offer to repurchase
all Senior Notes properly tendered at a price equal to 101% of the principal
amount plus accrued and unpaid interest to the date of repurchase. On January 6,
2000, the Company signed a definitive merger agreement, if approved, that will
constitute a change in control (see Note 11). The indenture also provides for
redemption of the Senior Notes at any time, in whole or in part, on or after
July 15, 2003 at a premium through July 15, 2005. In addition, on or prior to
July 15, 2001, the Company may redeem up to 35% of the original aggregate
principal amount of the Senior Notes at a premium with the proceeds of one or
more equity offerings.

    The Senior Note indenture also restricts the Company's ability to incur
additional indebtedness, to create liens or other encumbrances, to make certain
payments, investments, loans and guarantees and to sell or otherwise dispose of
a substantial portion of assets to, or merge or consolidate with, an
unaffiliated entity. In October 1999, the Company paid the holders of the Senior
Notes $2,100 in consideration for modified terms which allowed the Company to
enter into a commitment for approximately $122,000 of capital lease financing.

    In connection with the Senior Notes Offering, the Company repaid $1,477
outstanding under a credit facility and refinanced $11,000 of indebtedness owed
to Linsang Partners L.L.C. ("Linsang"), a stockholder of the Company. In
connection with the refinancing, Linsang acquired 11,000 units in the Senior
Notes Offering. The net proceeds to the Company, after the Senior Notes Offering
expenses and retirement and refinancing of debt, approximated $239,000.

    In December 1997, the Company borrowed $1,000 from Linsang. The unsecured
note had a stated rate of interest of 9.75% and provided for monthly interest
payments beginning February 1, 1998, with the principal due on demand after
December 31, 1998, and maturing December 31, 2002. During 1998, the Company
borrowed $10,000 from Linsang on terms substantially the same as the previous
note. The Linsang notes were refinanced in July 1998, in connection with the
Senior Notes offering, as stated above.

6. INCOME TAXES

    A provision for income taxes for the periods ended December 31, 1997, 1998
and 1999 has not been recognized as the Company had operating losses for both
tax and financial reporting purposes. Due to the uncertainty surrounding the
timing of realizing the benefits of its favorable tax attributes in

                                      F-12
<PAGE>
                            SPLITROCK SERVICES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

           (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

6. INCOME TAXES (CONTINUED)
future tax returns, the Company has recorded a full valuation allowance against
its otherwise recognizable net deferred tax asset.

    Deferred tax assets and liabilities consist of the following:

<TABLE>
<CAPTION>
                                                              DECEMBER 31,
                                                           -------------------
                                                             1998       1999
                                                           --------   --------
<S>                                                        <C>        <C>
Net operating loss carryforwards.........................  $ 22,465   $ 65,758
Depreciation.............................................     3,325      4,965
Other....................................................       429      1,082
                                                           --------   --------
    Deferred tax assets..................................    26,219     71,805
                                                           --------   --------
Leases...................................................      (474)    (6,750)
                                                           --------   --------
    Deferred tax liabilities.............................      (474)    (6,750)
                                                           --------   --------
Net deferred tax assets..................................    25,745     65,055
Valuation allowance......................................   (25,745)   (65,055)
                                                           --------   --------
Net deferred tax assets..................................  $     --   $     --
                                                           ========   ========
</TABLE>

    The Company's net operating loss carryforward totals approximately $173,000
of which approximately $9,500 expires in 2012, $55,100 expires in 2018 and the
remainder in 2019. Certain changes in ownership of the Company could result in
limitations on the Company's ability to utilize the losses.

7. COMMITMENTS AND CONTINGENCIES

    The Company leases office space, equipment facilities and equipment under
noncancelable operating and capital leases expiring through the year 2003. Rent
expense for noncancelable operating leases amounted to $663 in 1998 and $5,131
in 1999.

    Future minimum payments by year end in the aggregate related to
noncancelable operating and capital leases at December 31, 1999 are:

<TABLE>
<CAPTION>
                                                  CAPITAL    OPERATING
                                                   LEASES     LEASES      TOTAL
                                                  --------   ---------   --------
<S>                                               <C>        <C>         <C>
2000............................................  $22,956     $ 6,207    $29,163
2001............................................   11,004       7,061     18,065
2002............................................   10,366       6,962     17,328
2003............................................      384       6,912      7,296
2004............................................       --       5,806      5,806
                                                  -------     -------    -------
        Total minimum lease payments............  $44,710     $32,948    $77,658
                                                  =======     =======    =======
        Less amount representing interest.......   (4,687)
                                                  -------
Present value of minimum capital lease
  payments......................................  $40,023
                                                  =======
</TABLE>

                                      F-13
<PAGE>
                            SPLITROCK SERVICES, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
     (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS) (CONTINUED)

7. COMMITMENTS AND CONTINGENCIES (CONTINUED)

    The Company leases telephone lines from competitive local exchange
suppliers, interexchange carriers and long distance telephone companies
primarily for access and transport purposes ("line costs"). These line costs are
leased under both cancelable and noncancelable operating leases over periods
ranging from month-to-month to five years and are included in Network operating
costs on the consolidated statement of operations. The Company has commitments
to certain of these telecommunication vendors to meet certain minimum usage
volumes. Additionally, the Company is subject to certain cancellation penalties,
which could become applicable upon termination of a number of these agreements.
The cancellation penalties typically require a payment of certain percentage of
the remaining amounts due under the contract, depending on the year in which
cancellation may occur. Line costs included in the Splitrock Network operating
costs were $22,617 and $67,131 during the year ended December 31, 1998 and 1999,
respectively. Line costs incurred during both years comprise a substantial
portion of the Network operating costs.

    In October 1999, the Company entered into lease financing arrangements with
a third party leasing company to fund up to $122,000 of purchase commitments for
equipment, including optronics equipment. These lease arrangements were
originally structured as an operating lease, but were converted to a capital
lease after the Company obtained the necessary consents from the holders of the
Senior Notes. The consents were received on November 24, 1999. Capital leases
require payments on a monthly basis over periods ranging from 30 to 48 months,
with implicit interest rates of 9% to 12%.

    The Company has an agreement with a telecommunication supplier to provide
certain installation services for the Company. The minimum amount of services
for which the Company is required to pay is approximately $1,300. As of December
31, 1999, the Company has incurred approximately $1,000 of such amount in
connection with this agreement.

    In April 1999, the Company entered into a cost sharing agreement with a
national telecommunications provider (the Provider). The agreement grants the
Company an exclusive 20 year indefeasible right to use (IRU) in four dark fibers
in the nationwide fiber optic communication system currently under construction
by the Provider with an option to acquire the indefeasible rights to use up to
12 additional dark fibers, which expires April 26, 2000. The Company made an
initial payment of $11,200 to the Provider and is required to make additional
payments as dark fiber segments are accepted, which is expected to occur from
the first quarter of 2000 through the first quarter of 2001. The Company's
remaining obligation to retain its IRU in the original four dark fibers
approximates $81,600. In addition the Company is obligated to pay its pro-rata
portion of the maintenance costs incurred by the Provider for these fiber
strands for the term of the IRU.

    In connection with the fiber optic network deployment, in October 1999, the
Company committed to purchase a minimum of approximately $50,000 of fiber
optronics equipment, associated network management systems, and installation
services from Nortel. The equipment and services are expected to be delivered
through the next five quarters as the dark fiber network is available.

    On November 4, 1999, Ericsson, Inc. filed a Demand for Arbitration on a
"contract dispute" pursuant to the Commercial Arbitration Rules with the
American Arbitration Association concerning the Network Implementation
Agreement, between the parties. The Company has filed a counterclaim and intends
to vigorously defend the dispute pursuant to state tort and contract causes of
action, including negligent misrepresentation, fraud in the inducement, breach
of contract, failure to timely

                                      F-14
<PAGE>
                            SPLITROCK SERVICES, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
     (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS) (CONTINUED)

7. COMMITMENTS AND CONTINGENCIES (CONTINUED)
perform, failure to perform in a good and workmanlike manner, breach of the duty
of good faith, failure of consideration and failure of essential purpose. The
Company is seeking damages by offset and credit. Both parties are in the process
of selecting arbitrators so that a preliminary hearing can be scheduled.

8. EQUITY TRANSACTIONS

    The Company effected a 1-for-100 stock exchange on June 3, 1997, a 1-for-10
stock exchange on August 8, 1997 and a 0.563-for-1 reverse stock split effected
July 12, 1999. All share amounts included in these consolidated financial
statements have been adjusted to reflect the effect of the stock exchanges and
reverse stock split.

    Warrants issued in connection with the Company's Senior Note Offering are
exercisable at $.02 per share at any time on or after July 26, 1999 through July
15, 2008 for 1,487,791 shares of common stock. At December 31, 1999, warrants
for 914,730 shares of common stock remain unexercised.

    On August 6, 1999, the Company completed its initial public offering of its
common stock pursuant to a Registration Statement filed with the SEC. The
Company sold 9,692,628 shares of common stock at a price of $10.00 per share,
which resulted in net proceeds of approximately $88,400 after deducting the
underwriting discount and other fees and expenses. The underwriters purchased
692,628 of these shares pursuant to an over-allotment option. In addition
157,372 additional shares were sold, under the same agreement, by certain
existing shareholders. The Company did not receive any of the proceeds from the
sale of the 157,372 shares.

9. STOCK OPTIONS

    The Company's 1997 and 1999 Incentive Share Plans provide for options to
purchase up to 11,260,000 shares of common stock to be granted to certain
directors, employees or consultants of the Company. Options under the Plans have
terms of ten years and are granted with an exercise price equivalent to market
value at the date of grant. Individual option grants vest over time, based upon
a schedule approved by the Board of Directors, which is generally four years.
All of the Company's common stock options vest automatically upon a change in
control of the Company, as defined (see Note 11).

    The following summarizes the activity for the Plans:

<TABLE>
<CAPTION>
                                            1997                   1998                   1999
                                    --------------------   --------------------   --------------------
                                                WEIGHTED               WEIGHTED               WEIGHTED
                                                AVERAGE                AVERAGE                AVERAGE
                                                EXERCISE               EXERCISE               EXERCISE
                                     SHARES      PRICE      SHARES      PRICE      SHARES      PRICE
                                    ---------   --------   ---------   --------   ---------   --------
<S>                                 <C>         <C>        <C>         <C>        <C>         <C>
Options outstanding at beginning
  of fiscal year..................         --       --     1,058,440    $1.11     1,801,882    $ 2.31
  Granted.........................  1,058,440    $1.11     1,443,251    $2.97     3,094,798    $10.77
  Exercised.......................         --       --       571,445    $1.94       140,056    $ 1.41
  Canceled........................         --       --       128,364    $1.49       469,769    $ 8.34
                                    ---------              ---------              ---------
Options outstanding at end of
  year............................  1,058,440    $1.11     1,801,882    $2.31     4,286,855    $ 7.78
</TABLE>

                                      F-15
<PAGE>
                            SPLITROCK SERVICES, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
     (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS) (CONTINUED)

9. STOCK OPTIONS (CONTINUED)
    The following table summarizes information about the Company's stock options
outstanding at December 31, 1999:

<TABLE>
<CAPTION>
                                                   OPTIONS OUTSTANDING               OPTIONS EXERCISABLE
                                          --------------------------------------   -----------------------
                                             NUMBER       WEIGHTED-                   NUMBER
                                          OUTSTANDING      AVERAGE      WEIGHTED   EXERCISABLE    WEIGHTED
                                               AT         REMAINING     AVERAGE         AT        AVERAGE
                                          DECEMBER 31,   CONTRACTUAL    EXERCISE   DECEMBER 31,   EXERCISE
RANGE OF EXERCISE PRICES                      1999       LIFE (YEARS)    PRICE         1999        PRICE
------------------------                  ------------   ------------   --------   ------------   --------
<S>                                       <C>            <C>            <C>        <C>            <C>
$1.11 - $1.95...........................   1,186,739          7.74       $ 1.18      696,018       $1.14
$5.95 - $11.25..........................   2,604,771          9.33       $ 9.10       97,581       $5.95
$13.88 - $24.19.........................     495,345          9.84       $16.70           --       $  --
                                           ---------                                 -------
$1.11 - $24.19..........................   4,286,855          8.95       $ 7.78      793,598       $1.73
</TABLE>

    In October 1996, the FASB issued SFAS No. 123, "Accounting for Stock-Based
Compensation," which allows the Company to account for its employee stock-based
compensation plans under APB No. 25 and the related interpretations. According
to APB No. 25, deferred compensation is recorded for stock-based compensation
grants based on the excess of the market value of the common stock on the
measurement date over the exercise price. The deferred compensation is amortized
over the vesting period of each unit of stock-based compensation grant. If the
exercise of the stock-based compensation grants is equal to the market price of
the Company's stock on the date of grant, no compensation expense is recorded.

    During the year ended December 31, 1998 and 1999, the Company recognized
compensation expense of $46 and $0 for options granted at a discount from the
then estimated fair market value of the Company's Common Stock.

    Had compensation cost for the Company's stock option plan been determined
based on the estimated fair market value at the grant date, consistent with the
provisions of SFAS No. 123, the Company's pro forma net loss would have been as
follows:

<TABLE>
<CAPTION>
                                                         PRO FORMA
                                                        PERIOD FROM
                                                         INCEPTION
                                                         (MARCH 5,
                                                           1997)        PRO FORMA      PRO FORMA
                                                          THROUGH       YEAR ENDED     YEAR ENDED
                                                        DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                            1997           1998           1999
                                                        ------------   ------------   ------------
<S>                                                     <C>            <C>            <C>
Net loss..............................................    $(10,141)      $(58,254)      $(105,322)
Net loss per share--basic and diluted.................       (0.42)         (1.31)          (2.07)
</TABLE>

    Options granted in 1997, 1998 and 1999 had weighted-average fair values of
$0.077, $1.00, and $6.42, respectively. For purposes of estimating the fair
value of options granted, the Company used no future dividends, used average
U.S. government security interest rates for its risk-free interest rates of
5.80%, 4.39% and 5.36%, assumed no volatility, 70.5% and 75% volatility, and
assumed expected life of the options of five, four and four years in 1997, 1998
and 1999, respectively.

                                      F-16
<PAGE>
                            SPLITROCK SERVICES, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
     (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS) (CONTINUED)

10. RELATED PARTY TRANSACTIONS

    The Company's chairman of the Board of Directors (the "Chairman"), who is
also a shareholder of the Company, is the Chief Technical Officer of Lucent
Technologies, Inc. (the "Vendor") from which the Company purchased approximately
$427 in equipment through December 31, 1998 and $17,600 in products and services
during the year ended December 31, 1999.

    Linsang, an affiliate of the Chairman, loaned $1,000 to the Company for the
purchase of certain network equipment in December 31, 1997. During 1998, the
affiliate made further advances of $10,000 under this agreement. The unsecured
notes had a stated rate of interest of 9.75% and provided for monthly interest
payments beginning February 1, 1998, with the principal due on demand after
December 31, 1998, and maturing December 31, 2002. The Notes were refinanced in
July 1998, in connection with the Senior Notes offering (Note 5).

    A former director of the Company exercised a option to purchase 563,000
shares of the Company Common Stock for $1,100 in June 1998 and 11,260 shares of
the Company common stock for $22 in August 1999.

    In September 1997, Orient Star Holdings, a wholly-owned subsidiary of Carso
Global Telecom, S.A. de C.V. (the controlling stockholder of Prodigy) purchased
11,260,000 shares of the Company for $1.11 per share and paid $0.10, for a
warrant to purchase an additional 2,815,000 shares of the Company through
September 18, 1998 for $1.11 per share. The warrants were exercised in September
1998.

11. SUBSEQUENT EVENTS

    In February 2000, the Company revised its agreement with Prodigy to convert
the pricing formula from a subscriber based arrangement to a fixed hourly fee
for usage effective January 1, 2000. As part of this amendment, the term of the
contract was extended to December 31, 2001.

    On March 30, 2000, the Company was acquired by a wholly-owned subsidiary of
McLeodUSA Incorporated ("McLeodUSA") pursuant to the Amended Plan of Merger
dated February 11, 2000. The acquisition of Splitrock Services by McLeodUSA was
effected through two separate but related transactions:

    - a holding company reorganization, in which Splitrock Services, Inc. became
      a wholly-owned subsidiary of its former subsidiary, Splitrock Holdings,
      resulting in reductions to the number of authorized shares and the number
      of shares issued and outstanding; and

    - a merger of Southside Acquisition Corporation, a Delaware corporation and
      wholly-owned subsidiary of McLeodUSA, with and into Splitrock Holdings in
      which Splitrock Holdings was the surviving corporation and became a
      wholly-owned subsidiary of McLeodUSA.

    Pursuant to these transactions, each of the Company's shareholders
ultimately received 0.5347 shares of McLeodUSA Class A common stock in exchange
for each share of Splitrock common stock owned. A substantial portion of the
Company's outstanding stock options became fully vested upon the merger pursuant
to a change of control provision in the Company's stock option plans. At the
time of the merger, each right to purchase a share of the Company's common stock
pursuant to an outstanding option or warrant was converted into an option or
warrant with a right to purchase 0.5347 of a share of McLeodUSA Class A common
stock.

                                      F-17
<PAGE>
                            SPLITROCK SERVICES, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
     (AMOUNTS IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS) (CONTINUED)

11. SUBSEQUENT EVENTS (CONTINUED)
    In connection with the acquisition of the Company's stock by McLeodUSA, the
common stock of Splitrock Services, Inc. was delisted from The Nasdaq Stock
Market.

    During March 2000, the Company issued 792,235 shares of its common stock
representing the shares underlying the common stock warrants outstanding as of
that date. These shares were issued to the warrant agent to be held in reserve
until the warrants are exercised by the warrant holders. Upon issuance of the
shares, the Company recorded the value of the warrants as common stock and
additional paid in capital. Upon the merger these shares converted to McLeodUSA
Class A common stock based on the 0.5347 exchange ratio. In connection with the
merger and conversion, McLeodUSA assumed the Company's obligations under the
Warrant Agreement dated July 24, 1998, as amended.

    During March 2000, the Company settled its contract dispute with
Ericsson, Inc.

    In July, 2000, the $261 million Splitrock Senior Notes were retired. The
total payment for these notes was approximately $316 million.

                                       * * *

                                      F-18
<PAGE>
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                                  $150,000,000

                                   MCLEODUSA
                                  INCORPORATED

                                12% SENIOR NOTES
                                    DUE 2008

                                     [LOGO]

                                   PROSPECTUS

                             DATED OCTOBER 30, 2000

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