USINTERNETWORKING INC
S-1/A, 1999-01-22
COMPUTER PROGRAMMING SERVICES
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<PAGE>
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 22, 1999
    
 
   
                                                      REGISTRATION NO. 333-70717
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 1
                                       TO
                                    FORM S-1
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
    
                             ---------------------
 
                            USINTERNETWORKING, INC.
 
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                               <C>                               <C>
            DELAWARE                            7379                           52-2078325
(STATE OR OTHER JURISDICTION OF     (PRIMARY STANDARD INDUSTRIAL            (I.R.S. EMPLOYER
 INCORPORATION OR ORGANIZATION)     CLASSIFICATION CODE NUMBER)           IDENTIFICATION NO.)
</TABLE>
 
                            ------------------------
 
                                 ONE USI PLAZA
                         ANNAPOLIS, MARYLAND 21401-7478
                                 (410) 897-4400
 
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
                         ------------------------------
 
                             WILLIAM T. PRICE, ESQ.
                 VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
                                 ONE USI PLAZA
                         ANNAPOLIS, MARYLAND 21401-7478
                                 (410) 897-4400
 
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                         ------------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                         <C>
          JAMES F. ROGERS, ESQ.                      WILLIAM B. GANNETT, ESQ.
             LATHAM & WATKINS                        CAHILL GORDON & REINDEL
1001 PENNSYLVANIA AVENUE, N.W., SUITE 1300                80 PINE STREET
           WASHINGTON, DC 20004                      NEW YORK, NY 10005-1702
              (202) 637-2200                              (212) 701-3000
</TABLE>
 
                            ------------------------
 
    APPROXIMATE DATE OF COMMENCEMENT OF THE PROPOSED SALE TO THE PUBLIC: As soon
as practicable after the effective date of the Registration Statement.
 
    If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box: / /
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. / /____
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /____
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /____
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
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- --------------------------------------------------------------------------------
<PAGE>
The information in this Prospectus is not complete and may be changed. We may
not sell these securities until the registration statement filed with the
Securities and Exchange Commission is effective. This Prospectus is not an offer
to sell these securities and it is not soliciting an offer to buy these
securities in any state where the offer or sale is not permitted.
<PAGE>
   
                 SUBJECT TO COMPLETION, DATED JANUARY 22, 1999
    
 
                                           Shares
 
                                     [LOGO]
 
                            USINTERNETWORKING, INC.
 
                                  Common Stock
 
                                  -----------
 
    Prior to this offering, there has been no public market for our Common
Stock. The initial public offering price is expected to be between $       and $
      per share. We will apply to list our Common Stock on the Nasdaq National
Market under the symbol "USIX."
 
    The underwriters have an option to purchase a maximum of       additional
shares to cover over-allotments of shares.
 
    Investing in our Common Stock involves certain risks. See "Risk Factors"
beginning on page 5.
 
<TABLE>
<CAPTION>
                                                                             Underwriting
                                                            Price to         Discounts and        Proceeds
                                                             Public           Commissions          to USI
                                                        -----------------  -----------------  -----------------
<S>                                                     <C>                <C>                <C>
Per Share.............................................    $                $                  $
Total.................................................  $                  $                  $
</TABLE>
 
    Delivery of the shares of Common Stock will be made on or about       ,
1999, against payment in immediately available funds.
 
    Neither the Securities and Exchange Commission nor any other state
securities commission has approved or disapproved these securities or determined
if this Prospectus is truthful or complete. Any representation to the contrary
is a criminal offense.
 
Credit Suisse First Boston
 
           Bear, Stearns & Co. Inc.
 
                         BT Alex. Brown
 
                                 Legg Mason Wood Walker
                                             Incorporated
 
                      Prospectus dated              , 1999
<PAGE>
                                 --------------
 
                               TABLE OF CONTENTS
   
<TABLE>
<CAPTION>
                                                 PAGE
                                               ---------
<S>                                            <C>
PROSPECTUS SUMMARY...........................          3
RISK FACTORS.................................          5
USE OF PROCEEDS..............................         15
DIVIDEND POLICY..............................         15
CAPITALIZATION...............................         16
DILUTION.....................................         17
SELECTED HISTORICAL CONSOLIDATED FINANCIAL
  DATA.......................................         18
MANAGEMENT'S DISCUSSION AND ANALYSIS OF
  FINANCIAL CONDITION AND RESULTS OF
  OPERATIONS.................................         19
BUSINESS.....................................         23
MANAGEMENT...................................         35
 
<CAPTION>
                                                 PAGE
                                               ---------
<S>                                            <C>
CERTAIN RELATIONSHIPS AND RELATED
  TRANSACTIONS...............................         44
PRINCIPAL STOCKHOLDERS.......................         47
DESCRIPTION OF CAPITAL STOCK.................         50
SHARES ELIGIBLE FOR FUTURE SALE..............         52
UNDERWRITING.................................         53
NOTICE TO CANADIAN RESIDENTS.................         55
LEGAL MATTERS................................         56
EXPERTS......................................         56
WHERE YOU CAN FIND MORE INFORMATION..........         56
INDEX TO FINANCIAL STATEMENTS................        F-1
</TABLE>
    
 
                                 --------------
 
   
    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS DOCUMENT OR TO
WHICH WE HAVE REFERRED YOU. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH
INFORMATION THAT IS DIFFERENT. THIS DOCUMENT MAY BE USED ONLY WHERE IT IS LEGAL
TO SELL THESE SECURITIES. THE INFORMATION IN THIS DOCUMENT MAY BE ACCURATE ONLY
ON THE DATE OF THIS DOCUMENT.
    
 
   
    We have applied for federal registration of the marks "USINTERNETWORKING,"
"USI," "Internet Managed Application Provider," "IMAP" and "USIView." This
Prospectus also includes trademarks, service marks and trade names of other
companies.
    
 
                     DEALER PROSPECTUS DELIVERY OBLIGATION
 
    UNTIL            , 1999 (25 DAYS AFTER THE COMMENCEMENT OF THIS OFFERING),
ALL DEALERS THAT EFFECT TRANSACTIONS IN THESE SECURITIES, WHETHER OR NOT
PARTICIPATING IN THIS OFFERING, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS IS
IN ADDITION TO THE DEALER'S OBLIGATION TO DELIVER A PROSPECTUS WHEN ACTING AS AN
UNDERWRITER AND WITH RESPECT TO UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
 
                                       2
<PAGE>
                               PROSPECTUS SUMMARY
 
   
    THIS SUMMARY MAY NOT CONTAIN ALL OF THE INFORMATION THAT MAY BE IMPORTANT TO
YOU. YOU SHOULD READ THE ENTIRE PROSPECTUS, INCLUDING THE FINANCIAL DATA AND
RELATED NOTES, BEFORE MAKING AN INVESTMENT DECISION. UNLESS OTHERWISE INDICATED,
ALL INFORMATION IN THIS PROSPECTUS (1) ASSUMES NO EXERCISE OF THE OVER-ALLOTMENT
OPTION TO PURCHASE ADDITIONAL SHARES OF COMMON STOCK GRANTED TO THE UNDERWRITERS
AND (2) DOES NOT REFLECT A 1 FOR     STOCK SPLIT WHICH WILL BECOME EFFECTIVE
PRIOR TO THE CONSUMMATION OF THIS OFFERING. IN THIS PROSPECTUS, WE WILL REFER TO
USINTERNETWORKING, INC. AND ITS SUBSIDIARIES, COLLECTIVELY, AS "USI," "WE" AND
"US."
    
 
                            ABOUT USINTERNETWORKING
 
   
    USI's service offerings make it possible for its clients to use leading
business software applications without the cost and burden of owning or managing
the underlying technology. Our clients access these applications through our
state-of-the-art Internet-based network. Our Internet Managed Application
Provider(sm) (IMAP(sm)) solutions integrate the implementation, operations,
communications and support of Internet-enabled packaged software applications.
USI has established its IMAP offerings as a leading single-source solution for
middle market enterprises implementing distributed business functions such as
sales force automation, customer support, e-commerce, and human resource and
financial systems. USI also provides Complex Web Hosting by making its
infrastructure available to clients who want to run their own applications in a
highly reliable and secure Internet environment.
    
 
                                  THE OFFERING
 
<TABLE>
<S>                                            <C>
Common Stock Offered by USI..................  shares
Common Stock to be Outstanding after this
 Offering....................................  shares(1)
Use of Proceeds..............................  The continued expansion and enhancement of
                                               our network, the addition of services to our
                                               IMAP offerings, payment of preferred stock
                                               dividend, working capital and general
                                               corporate purposes.
Proposed Nasdaq National Market Symbol.......  "USIX"
</TABLE>
 
- ----------------------------------------
 
   
(1) Based on shares outstanding as of December 31, 1998. Does not include up to
                shares of Common Stock that may be sold by us to the
    underwriters to cover over-allotments, if any. Also excludes 13,458,000
    shares of Common Stock reserved for issuance under our stock option plan,
    all of which were subject to outstanding options as of December 31, 1998 and
    11,861,317 shares of Common Stock issuable upon the exercise of outstanding
    warrants.
    
 
     SUMMARY UNAUDITED PRO FORMA AND HISTORICAL CONSOLIDATED FINANCIAL DATA
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                      PRO FORMA(1) FOR THE YEAR
                                                                                                ENDED
                                                                                          DECEMBER 31, 1998
                                                                                    ------------------------------
<S>                                                                                 <C>
OPERATING STATEMENT DATA:
Revenues..........................................................................            $   13,938
Operating expenses................................................................                45,866
Net loss..........................................................................               (34,268)
OTHER DATA:
EBITDA(2).........................................................................            $  (27,636)
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                        AS OF DECEMBER 31, 1998
                                                                                      ----------------------------
                                                                                                     PRO FORMA
                                                                                        ACTUAL     AS ADJUSTED(3)
                                                                                      ----------  ----------------
<S>                                                                                   <C>         <C>
BALANCE SHEET DATA:
Cash and cash equivalents...........................................................  $   43,802     $
Working capital.....................................................................      24,269
Total assets........................................................................     107,527
Long-term debt and capital lease obligations, excluding current portion.............       8,659
Series B Convertible Redeemable Preferred Stock.....................................      62,242         --
Common stock subject to repurchase..................................................       4,145         --
Stockholders' equity (deficit)......................................................      (1,457)
</TABLE>
    
 
- ----------------------------------------
 
(1) Gives effect to the acquisition of ACR and IIT as if they had occurred as of
    January 1, 1998.
 
(2) EBITDA consists of earnings (loss) before interest, taxes, depreciation and
    amortization. EBITDA is a measure commonly used in our industry and is
    presented to enhance an understanding of our operating results. It should
    not be construed as an alternative to cash flow from operating activities or
    net earnings (loss), determined in accordance with GAAP. It may be
    calculated differently from EBITDA for other companies.
 
   
(3) Gives effect to (i) the conversion of the convertible preferred stock into
    Common Stock and (ii) receipt of the net proceeds from the sale of   shares
    of Common Stock offered hereby by USI (assuming an initial public offering
    price of $  per share).
    
 
                                       3
<PAGE>
                            ABOUT USINTERNETWORKING
 
    USI's service offerings make it possible for its clients to use leading
business software applications without the cost and burden of owning or managing
the underlying technology. Our clients access these applications through our
state-of-the-art Internet-based network. Our IMAP solutions integrate the
implementation, operations, communications and support of Internet-enabled
packaged software applications. USI has established its IMAP offerings as a
leading single-source solution for middle market enterprises implementing
distributed business functions such as sales force automation, customer support,
e-commerce, and human resource and financial systems. USI also provides Complex
Web Hosting by making its infrastructure available to clients who want to run
their own applications in a highly reliable and secure Internet environment.
 
   
    As a central element of our strategy, we have established relationships with
software vendors in key application areas, including Siebel in sales force
automation, customer service and enterprise marketing; PeopleSoft in human
resources and financials; Sagent in decision support; and BroadVision in
e-commerce. USI is the exclusive outsource provider of Siebel ERM application
hosting and rental services for direct customers of Siebel headquartered in
North America and is one of nine currently certified outsourcing partners for
PeopleSoft. The agreements with software providers generally enable USI to
deploy the applications as a service without the need to establish a separate
licensing arrangement for each client. The agreements also enable us to provide
our clients with an economically attractive service offering, and afford us
co-marketing and co-branding opportunities. These agreements provide USI with an
initial software portfolio that can meet a broad range of clients' Enterprise
Resource Planning (ERP), e-commerce and communication needs.
    
 
   
    To deliver its services, USI has built an advanced network of four
Enterprise Data Centers (EDCs) located in Annapolis, Maryland; Milpitas (Silicon
Valley), California; Amsterdam and Tokyo. This global network was specifically
engineered to provide the highest possible performance in delivering Web-based
content and information to users worldwide. As a result, we believe our clients
benefit from superior response time and unsurpassed levels of reliability and
security. Our unique architecture offers redundant Internet connectivity and
hardware systems, bypasses congested public exchange points, and enables 100%
mirroring of client sites across dispersed geographies.
    
 
    USI has developed modular product offerings and built implementation teams
with expertise in the specific business processes which our IMAP offerings
support. These teams can implement applications and generate value for clients
very quickly. For example, our typical implementation of Siebel technology is
designed to be completed in 45 days. We believe that this provides a competitive
advantage versus a more conventional implementation cycle of six months to more
than a year. In addition to our IMAP implementations, we also sell traditional
implementation services on a time and materials basis.
 
    USI's integrated Client Care operation delivers 24x7 responsive personalized
service from dedicated multi-tier support teams with specialized knowledge of
each client's specific IMAP solution. USIView-TM- is designed to allow our
Client Care engineers to diagnose and correct clients' problems, wherever and
whatever their sources. USI's Client Care operation features directed calling
through a unique toll-free number for each client.
 
    Because we are selling a service and not the underlying technology, our IMAP
clients sign contracts that provide for fixed monthly payments. Once a contract
is signed, we invest in the hardware, software and implementation needed to
deliver that client's service. This will require a substantial investment in the
early years to build our client base. We expect to benefit from a rapidly
growing recurring revenue base, which we believe will generate substantial
positive cash flow in later years.
 
   
    USI was incorporated in Delaware in January 1998. Our principal executive
offices are located at One USI Plaza, Annapolis, Maryland 21401. Our telephone
number is (410) 897-4400. Our Web Site is located at www.usi.net. The
information on our Web Site is not part of this Prospectus.
    
 
                                       4
<PAGE>
                                  RISK FACTORS
 
    INVESTING IN OUR COMMON STOCK INVOLVES RISK. YOU SHOULD CAREFULLY CONSIDER
THE RISKS AND UNCERTAINTIES DESCRIBED BELOW BEFORE MAKING AN INVESTMENT
DECISION. THESE RISKS AND UNCERTAINTIES ARE NOT THE ONLY ONES FACING USI.
ADDITIONAL RISKS AND UNCERTAINTIES NOT NOW KNOWN TO US OR THAT WE CURRENTLY
CONSIDER IMMATERIAL MAY ALSO IMPAIR OUR BUSINESS OPERATIONS. IF ANY OF THE
FOLLOWING RISKS OR UNCERTAINTIES ACTUALLY OCCUR, OUR BUSINESS, FINANCIAL
CONDITION OR RESULTS OF OPERATIONS COULD BE MATERIALLY ADVERSELY AFFECTED. IN
THIS EVENT, THE TRADING PRICE OF THE COMMON STOCK COULD DECLINE, AND YOU COULD
LOSE ALL OR PART OF YOUR INVESTMENT. THIS PROSPECTUS ALSO CONTAINS
FORWARD-LOOKING STATEMENTS THAT INVOLVE RISKS AND UNCERTAINTIES. OUR ACTUAL
RESULTS COULD DIFFER MATERIALLY FROM THOSE ANTICIPATED IN THE FORWARD-LOOKING
STATEMENTS AS A RESULT OF CERTAIN FACTORS, INCLUDING THE RISKS AND UNCERTAINTIES
DESCRIBED BELOW AND ELSEWHERE IN THIS PROSPECTUS.
 
WE HAVE A LIMITED OPERATING HISTORY.
 
    We began operating in January 1998. Since then, we have focused on
developing our business, identifying and entering into strategic relationships
with packaged application software vendors, recruiting key management and
technical personnel, raising capital to fund our operations and the acquisitions
that are part of our business strategy and building our network. Only since
September 1998 have we begun to contract with customers for our IMAP offerings.
Our limited operating history makes predicting future results difficult.
 
WE HAVE INCURRED LOSSES AND EXPECT TO CONTINUE TO INCUR LOSSES.
 
   
    Starting up our company and building our network required substantial
capital and other expenditures. As a result, we reported an operating loss
before interest of approximately $29.9 million for the period from January 14,
1998 (our date of inception) through December 31, 1998, and net cash outflow
before financing of approximately $58.3 million for the same period. Further
developing our business and expanding our network will require significant
additional capital and other expenditures. We therefore expect to have
significant operating losses and to record significant net cash outflow before
financing in the near term.
    
 
OUR SUCCESS DEPENDS ON THE ACCEPTANCE OF INTERNET-BASED SERVICES.
 
    The market for Internet services, private network management solutions and
widely distributed Internet-enabled package application software has only
recently begun to develop. It is now evolving rapidly and is likely to be
entered by an increasing number of competitors. We cannot be certain that this
market will become viable or, if it becomes viable, that it will grow. If this
market fails to develop or develops more slowly than we expect, our business,
results of operations and financial condition would be materially and adversely
affected.
 
    In order to succeed in this market, we must differentiate ourselves from our
competitors through our products and services. We cannot be sure that we will do
so or, if we do, that our products and services will be accepted by the market.
Because our products and services are new and only partially tested, we cannot
be sure that businesses will buy them. We may face increased costs or, for
technical or other reasons, be unable to develop, introduce or market new
services or enhance existing services on a timely basis. Any of these events
could materially adversely affect our business, results of operations or
financial condition.
 
OUR VIABILITY, PROFITABILITY AND GROWTH LARGELY DEPEND ON SUCCESSFUL
  IMPLEMENTATION OF OUR BUSINESS STRATEGY.
 
    We cannot be sure that we will successfully implement our business strategy,
or that we will achieve the operating efficiencies and synergies upon which it
depends.
 
                                       5
<PAGE>
    A key element of our business strategy is rapid growth. Our growth will
depend on, among other things, establishing additional relationships with
strategic software vendors and developing and marketing new products and
services, particulary our IMAP solutions, all in a timely manner, at reasonable
cost and on satisfactory terms. Our ability to establish relationships with
strategic software vendors and acquire and integrate other businesses may be
affected by various factors, many of which are not within our control. These
include competition, technological developments and governmental regulation.
 
    Implementing our business strategy involves risks, expenses and
difficulties, including those of:
 
    - Negotiating acceptable software licensing agreements and strategic
      partnerships.
 
    - Developing our operational support and back office systems.
 
    - Attracting and retaining customers.
 
    - Integrating acquired businesses into our operations.
 
    These risks, expenses and difficulties are increased by the market
uncertainties facing our products and services.
 
WE MAY NOT BE ABLE TO ACCURATELY ESTIMATE OR REALIZE OUR IMAP BACKLOG.
 
    Because of our limited operating history, we may not be able to accurately
estimate our backlog (IMAP revenues under contract but not yet earned) or
convert it into revenue. The majority of our IMAP sales are made pursuant to
individual service contracts which we reflect in our backlog upon contract
signing. As of December 31, 1998, seven IMAP clients represented a backlog of
approximately $2.0 million, of which we expect $1.0 million will be recognized
as revenue in 1999. Our failure to convert our backlog into revenue would have a
material adverse effect on our business, financial condition and results of
operations.
 
MANAGING OUR GROWTH MAY BE DIFFICULT.
 
    We expect our business to grow both geographically and in terms of the
number of products and services we offer. In order to successfully manage our
growth, and in particular to integrate the operations of newly acquired
businesses, we must:
 
    - Enlarge our network and infrastructure.
 
    - Improve our management, financial and information systems and controls.
 
    - Expand, train and manage our employee base effectively.
 
    There will be additional demands on our customer service support and sales,
marketing and administrative resources as we increase our service offerings and
expand our target markets. The strains imposed by these demands are magnified by
the start-up nature of our operations. We cannot be sure that we will
successfully manage our growth. If we cannot manage our growth effectively, our
business, financial condition or results of operations could be adversely
affected.
 
    Furthermore, we cannot be sure that our administrative, operating and
financial control systems, infrastructure, facilities and personnel will be
adequate to support our future operations or to effectively adapt to future
growth. The inability to continue to upgrade our systems, infrastructure and
facilities, the inability to recruit, hire and retain necessary personnel or the
emergence of unexpected expansion difficulties could have a material adverse
effect on our business, financial condition or results of operations.
 
                                       6
<PAGE>
WE NEED TO RECRUIT ADDITIONAL SKILLED PERSONNEL.
 
    We believe that our short- and long-term success depends largely on our
ability to attract and retain highly skilled technical, managerial and marketing
personnel, particularly additional management personnel in the areas of
application integration and technical support. Competition for such personnel is
intense.
We may not be able to hire the necessary personnel to implement our business
strategy, or we may need to pay higher compensation for employees than we
currently expect. We cannot be sure that we will succeed in attracting and
retaining the personnel we need to continue to grow. Our inability to attract
and retain such personnel could limit our growth and have a material adverse
effect on our business, results of operations and financial condition.
 
WE DEPEND ON KEY PERSONNEL.
 
    Our success also depends in significant part on the continued services of
our key technical, sales and senior management personnel. We have employment
agreements with certain key employees, including Christopher R. McCleary,
Stephen E. McManus, Jeffery L. McKnight, Andrew A. Stern, Matthew D. Kanter and
L. Sebastian Alegrett, but few other officers or key employees are party to
employment agreements and each of those that are not can terminate his or her
relationship with us at any time. Losing one or more of our key employees could
have a material adverse effect on our business, results of operations and
financial condition.
 
WE WILL HAVE BROAD DISCRETION TO ALLOCATE THE PROCEEDS OF THIS OFFERING.
 
   
    We estimate the net proceeds to us from this offering to be approximately
$      million (after deducting estimated offering expenses). We plan to use
these proceeds mainly to continue expanding and enhancing our network, to add
services to our IMAP offerings, and for working capital and other general
corporate purposes. In addition, we will use some of the prceeds to pay accrued
dividends on our shares of convertible preferred stock. Some of the net proceeds
may also be used to repay current or future debts fund acquisitions or acquire
complementary products or to obtain the right to use complementary technologies.
Accordingly, our management will retain broad discretion to allocate the
proceeds of this offering. Management's failure to apply such funds effectively
could have a material adverse effect on our business, results of operations and
financial condition.
    
 
WE DEPEND ON THIRD-PARTY SUPPLIERS.
 
    We depend on other companies to supply certain key components of our
telecommunications infrastructure and system and network management solutions.
Some of these are available only from sole or limited sources in the quantities
and quality we demand. For example, the hardware we use to support our real-time
mirroring and disaster recovery functions is supplied only by EMC Corporation.
We buy these components from time to time, do not carry significant inventories
of them and have no guaranteed supply arrangements with our vendors. Any failure
to obtain needed products or services in a timely fashion and at an acceptable
cost could have a material adverse effect on our business, results of operations
and financial condition.
 
WE DEPEND ON STRATEGIC RELATIONSHIPS WITH APPLICATION SOFTWARE VENDORS.
 
   
    We obtain software products pursuant to agreements with PeopleSoft USA,
Inc.; Siebel Systems Inc.; Sagent Technology, Inc.; BroadVision, Inc.; and
Oracle Corporation, and package them as part of our IMAP solutions. The
agreements are for terms ranging from one to four years. Our IMAP offerings are
central to our business strategy. If these agreements were to be terminated or
not renewed, we might have to discontinue products or services or delay or
reduce their introduction unless we could find, license and package equivalent
technology. Our business strategy also depends on obtaining additional
application software. We cannot be sure, however, that we will be able to obtain
the new or enhanced applications we
    
 
                                       7
<PAGE>
may need to keep our IMAP solutions competitive. If we cannot obtain such
applications and as a result must discontinue, delay or reduce the availability
of our IMAP solutions or other products or services, our business, results of
operations and financial condition may be materially adversely affected.
 
    All but one of our third-party agreements are non-exclusive. Our competitors
may also license and utilize the same technology in competition with us. We
cannot be sure that the vendors of technology used in our products will continue
to support such technology in its current form. Nor can we be sure that we will
be able to adapt our own products to changes in such technology. In addition, we
cannot be sure that the financial or other difficulties of third party vendors
will not have a material adverse effect upon the technologies incorporated in
our products, or that, if such technologies become unavailable, we will be able
to find suitable alternatives.
 
DEVELOPING AND EXPANDING OUR OPERATIONS WILL DEPEND, AMONG OTHER THINGS, ON
  MANAGEMENT'S ABILITY TO SUCCESSFULLY INTEGRATE THE COMPANIES WE HAVE ACQUIRED.
 
    Acquisitions commonly involve risks. For instance:
 
    - It may be difficult to assimilate acquired operations and personnel.
 
    - Our ongoing business may be disrupted and resources and management time
      diverted.
 
    - We may not be able to retain the management and other key personnel of the
      acquired business.
 
    - We may not be able to maintain uniform standards, controls, procedures and
      policies.
 
    - We may be entering markets in which we have little or no direct prior
      experience.
 
    - Changing management may impair relationships with an acquired business's
      employees or customers.
 
    In September and October of 1998, we acquired I.I.T. Holding, Inc. and
Advanced Communication Resources, Inc. We cannot be sure that we will be able to
continue to successfully integrate the businesses of IIT and ACR into our own,
or that these businesses will perform as expected. In addition, we cannot be
sure that we will be able to successfully integrate any business acquired in the
future into our own. Our failure to successfully integrate an acquired company
or its subsequent underperformance could have a material adverse effect on our
business, results of operations and financial condition.
 
OUR SYSTEMS COULD BE VULNERABLE TO SECURITY RISKS.
 
   
    Questions about secure transmission of confidential information form a
significant barrier to e-commerce and communications. Our services rely on
encryption and authentication technology licensed from third parties to provide
the security and authentication needed to safely transmit confidential
information. Although we have designed and implemented a variety of network
security measures, unauthorized access, computer viruses, accidental or
intentional acts and other disruptions may occur. Our EDCs may experience delays
or service interruptions as a result of the accidental or intentional acts of
Internet users, current and former employees or others. Such acts could
potentially jeopardize the security of confidential information, such as credit
card and bank account numbers, stored in our and our clients' computer systems.
Such a breach in security could result in liability to us and in the loss of
existing clients or the deterrence of potential clients.
    
 
    Although we plan to continue using industry-standard security measures, such
measures have been circumvented in the past, and ours may be circumvented in the
future. The costs required to eliminate computer viruses and alleviate other
security problems could be prohibitively expensive, and efforts to address such
problems could result in delays or interruption of service to our clients. These
could in turn have a material adverse effect on our business, results of
operations and financial condition. Concerns over
 
                                       8
<PAGE>
transaction security and user privacy may also inhibit the growth of the
Internet, especially as a means of conducting commercial transactions, and
thereby inhibit the growth of our market.
 
OUR SUCCESS DEPENDS ON THE AVAILABILITY AND RELIABILITY OF THE CAPACITY WE LEASE
  FROM OUR TELECOMMUNICATIONS NETWORK SUPPLIERS.
 
    We depend on a number of telecommunications suppliers to provide our
backbone capacity and maintain its operational integrity. Although we lease
redundant capacity from multiple suppliers, degradation of services provided by
these suppliers could prevent us from maintaining our standard of service.
Furthermore, if we are unable to obtain additional bandwidth to make room for
increased traffic, we may not be able to continue to distribute content rapidly
and reliably through our network. If either of these things happen, our
business, results of operations and financial condition could be materially
adversely affected.
 
OUR SUCCESS DEPENDS LARGELY ON CONTINUED GROWTH IN INTERNET USE.
 
    The Internet is a unique and relatively new medium for conducting business
and exchanging commercial information. Future levels of demand for and market
acceptance of the Internet are hard to predict and depend on a number of
factors, including increased consumer access to and acceptance of new
interactive technologies, and the development of technologies for interactive
communication between organizations and target audiences. If the Internet fails
to continue to develop as a commercial or business medium or develops more
slowly than we expect, our business, results of operations and financial
condition could be materially adversely affected.
 
    The recent growth in Internet use has caused frequent periods of poor
performance. Internet Service Providers (ISPs) and other organizations with
links to the Internet have responded by upgrading routers and switches,
telecommunications links and other components forming the Internet
infrastructure. Any perceived degradation in the performance of the Internet as
a whole could undermine the value of the services we provide over the Internet.
Performance improvements in our services partly depend upon, and are ultimately
limited by, the speed and reliability of networks operated by others. In order
for the market for our services to emerge and grow, improvements must be made to
the entire Internet infrastructure to ease overloading and congestion.
 
WE WILL NEED ADDITIONAL CAPITAL TO FINANCE OUR GROWTH AND CAPITAL REQUIREMENTS.
 
    We believe that we must continue to enhance and expand our network
infrastructure to maintain our competitive position and to meet growing demands
for service quality, capacity and competitive pricing. Our ability to grow
depends partly on being able to expand our operations through owned or leased
network capacity. This requires significant capital expenditures, which we often
incur before receiving the related revenue.
 
   
    We believe that the estimated net proceeds from this offering, together with
our existing assets, currently available borrowing and expected revenue growth
and cost savings will provide sufficient funds for the implementation of client
contracts, to purchase required capital equipment and to fund our operations for
the next several years. If we grow beyond current expectations or identify one
or more attractive acquisitions, or our cash flow from operations is
insufficient to meet our working capital and capital expenditure requirements,
we will need to raise additional capital from equity or debt sources. We cannot
be sure that we will be able to obtain the additional financing to satisfy our
cash requirements or to implement our growth strategy on acceptable terms or at
all. If we cannot obtain such financing on terms acceptable to us, we may be
forced to curtail our planned business expansion and may be unable to fund our
ongoing operations.
    
 
                                       9
<PAGE>
   
    We are obligated under certain agreements to repurchase shares of our
capital stock. Employment agreements with three of our employees, holding in the
aggregate 10.75 million shares of Common Stock, require us to repurchase their
shares of Common Stock in the event of their death or disability, or with
respect to an employee holding 5 million shares, upon termination of his
employment, if the death, disability or termination occurs before the
consummation of this offering. See "Management--Employment Agreements." In
addition, in certain limited circumstances U S WEST has the right to require us
to repurchase our stock that it holds. See "Certain Relationships and Related
Transactions--Purchases of Series A Preferred Stock."
    
 
FUNDAMENTAL CHANGES IN THE TECHNOLOGIES FOR DELIVERING INTERNET ACCESS AND
  CONTENT, AND NETWORKING AND MANAGING CORPORATE INFORMATION TECHNOLOGY ASSETS,
  EXPOSE US TO SUBSTANTIAL RISKS.
 
    The markets we serve are characterized by rapidly changing technology,
evolving industry standards, emerging competition and the frequent introduction
of new services, software and other products. Our success depends partly on our
ability to enhance existing products, software and services and develop or
acquire new products, software and services that meet changing customer needs in
a timely and cost-effective way. We cannot be sure, however, that we will do
some or all of these things. For example, while our network is now accessed
mainly by computers through land lines, several companies have recently
developed or are developing wireless networking systems. If the Internet or
enterprise networks become accessible by other methods, or if there are
advancements in the delivery of networking services, we will need to develop new
technology or modify our existing technology to accommodate these developments.
This may require substantial time and expense, and even then we cannot be sure
that we will succeed in adapting our businesses to alternate access devices,
conduits or other technological developments.
 
    We believe that our ability to compete successfully also depends on the
continued compatibility and interoperability of our services with products,
services and architectures offered by various vendors. Although we will work
with vendors to test new products, we cannot be sure that their products will be
compatible with ours or that they will adequately address changing customer
needs. Although we currently plan to support emerging standards, we cannot be
sure what new industry standards will develop or, if they become established,
that we will be able to timely conform to these new standards and so stay
competitive. Our failure to conform to a prevailing standard, or the failure of
a common standard to emerge, could have a material adverse effect on our
business, results of operations and financial condition. In addition, we cannot
be sure that products, services or technologies developed by others will not
make ours noncompetitive or obsolete.
 
THE MARKETS WE SERVE ARE HIGHLY COMPETITIVE.
 
    There are few substantial barriers to entry, and we expect further
competition from existing and future competitors. The principal competitive
factors in these markets include:
 
    - Internet system engineering expertise.
 
    - Quality of customer service and support.
 
    - Network capability.
 
    - Reliability.
 
    - Quality of service and scalability.
 
    - Broad geographic presence.
 
    - Brand name.
 
    - Technical expertise and functionality.
 
                                       10
<PAGE>
    - Variety of services.
 
    - The ability to maintain and expand distribution channels.
 
    - Price.
 
    - The timing of introductions of new services.
 
    - Network security.
 
    - Financial resources.
 
    - Conformity with industry standards.
 
    We cannot be sure that we will have the resources or expertise to compete
successfully in the future.
 
    Our current and potential competitors include systems integrators, national
and regional ISPs, software and hardware vendors (including certain of our
strategic partners and suppliers), and global, regional and local
telecommunications companies and Regional Bell Operating Companies. Our
competitors, which may operate in one or more of these areas, include companies
such as certain subsidiaries of GTE Corporation; MCI WorldCom, Inc.;
International Business Machines Corporation; Frontier Corporation; UUNet
Technologies, Inc.; PSINet, Inc.; DIGEX, Inc.; Exodus Communications, Inc.;
Andersen Consulting; PricewaterhouseCoopers; AT&T Corporation; and Sprint
Corporation.
 
    Many of our competitors have substantially greater financial, technical and
marketing resources, larger customer bases, longer operating histories, greater
name recognition and more established relationships in the industry than we do.
As a result, some of our competitors may be able to:
 
    - More quickly develop and expand their network infrastructures and service
      offerings.
 
    - Better adapt to new or emerging technologies and changing customer needs.
 
    - Take advantage of acquisitions and other opportunities more readily.
 
    - Negotiate more favorable licensing agreements with software application
      vendors.
 
    - Devote greater resources to the marketing and sale of their products.
 
    - Adopt more aggressive pricing policies.
 
    Some of our competitors may also be able to provide customers with
additional benefits at lower overall costs. We cannot be sure that we will be
able to offset the effects of any such cost reductions. In addition, we believe
that there is likely to be consolidation in our markets sometime soon, which
could increase price and other competition in ways that materially adversely
affect our business, results of operations and financial condition.
 
IT MAY BE DIFFICULT TO PROTECT AND ENFORCE OUR INTELLECTUAL PROPERTY RIGHTS.
 
    We rely on a combination of copyright, trademark, service mark and trade
secret laws and contractual restrictions to establish and protect certain
proprietary rights in our products and services. We have no patented technology
that would bar competitors from our market. Despite our efforts to protect our
proprietary rights, unauthorized parties may attempt to copy or otherwise obtain
and use our products or technology. Policing such unauthorized use is difficult,
and we cannot be certain that we can prevent it, particularly in countries where
the laws may not protect our proprietary rights as fully as in the United
States.
 
    We also rely on certain technologies licensed from third parties. We cannot
be sure that these licenses will remain available to us on commercially
reasonable terms. The loss of such technology could require us to obtain
substitute technology of lower quality or performance standards or at greater
cost, which could materially adversely affect our business, results of
operations and financial condition.
 
                                       11
<PAGE>
    As the number of software products in our target markets increases and the
functionality of these products further overlap, software developers may become
increasingly subject to infringement claims. Someone may even claim that our
technology infringes their proprietary rights. Any such claims, whether with or
without merit, can be time consuming and expensive to defend, may divert
management's attention and resources, could cause product shipment delays and
could require us to enter into costly royalty or licensing agreements. If
successful, a claim of product infringement against us and our inability to
license the infringed or similar technology could adversely affect our business.
 
OUR INTERNATIONAL OPERATIONS PRESENT VARIOUS RISKS.
 
    We intend to expand into international markets, and we have already
established EDCs in Europe and Japan. We cannot be sure that we will be able to
deliver our services outside the United States. In addition, there are certain
risks inherent in conducting business internationally. These include:
 
    - Unexpected changes in regulatory requirements.
 
    - Export restrictions.
 
    - Tariffs and other trade barriers.
 
    - Challenges in staffing and managing foreign operations.
 
    - Differing technology standards.
 
    - Employment laws and practices in foreign countries.
 
    - Political instability.
 
    - Fluctuations in currency exchange rates.
 
    - Imposition of currency exchange controls.
 
    - Potentially adverse tax consequences.
 
    Any of these could adversely affect our international operations.
Furthermore, certain foreign governments, such as Germany, and the European
Union have enforced laws and regulations on content distributed over the
Internet that are more strict than those currently in place in the United
States.
 
    We cannot be sure that one or more of these factors will not have a material
adverse effect on our current or future international operations and,
consequently, on our business, results of operations and financial condition. In
addition, we cannot be sure that we will be able to obtain the necessary
telecommunications infrastructure in a cost-effective manner or compete
effectively in international markets.
 
GOVERNMENT REGULATION OF OUR BUSINESS IS UNSETTLED.
 
    Laws and regulations directly applicable to communications or commerce over
the Internet are becoming more prevalent. The last session of the United States
Congress resulted in Internet laws regarding children's privacy, copyrights,
taxation and the transmission of sexually explicit material. The European Union
recently enacted its own privacy regulations. The law of the Internet, however,
remains largely unsettled, even in areas where there has been some legislative
action. It may take years to determine whether and how existing laws such as
those governing intellectual property, privacy, libel and taxation apply to the
Internet. In addition, the growth and development of the market for online
commerce may prompt calls for more stringent consumer protection laws, both in
the United States and abroad, that may impose additional burdens on companies
conducting business online. The adoption or modification of laws or regulations
relating to the Internet could adversely affect our business.
 
                                       12
<PAGE>
WE COULD BE VULNERABLE TO THE YEAR 2000 PROBLEM.
 
    Many currently installed computer systems and software products are coded to
accept only two-digit entries in the date code field. These date code fields
will need to accept four-digit entries in order for 20th century dates to be
distinguished from 21st century dates. As a result, before the end of this year,
computer systems and software used by many companies may need to be upgraded to
comply with these "Year 2000" requirements.
 
    We recognize the need to ensure our operations will not be adversely
impacted by Year 2000 software failures. We have procedures for evaluating and
managing the risks and costs associated with this problem and believe that our
computer systems are Year 2000 compliant. However, many of our potential
customers maintain their Internet operations on UNIX-based servers, which may be
impacted by Year 2000 complications. The failure of our customers to ensure that
their servers are Year 2000 compliant could have a material adverse effect on
them, which in turn could have a material adverse effect on our business,
results of operations and financial condition.
 
    We face additional risks to the extent that services and systems purchased
by us, our suppliers, including suppliers of packaged application software
offered as a part of our IMAP offerings, and others with whom we do business are
not Year 2000 compliant. If any such third parties cannot provide us with
products, services or systems that are Year 2000 compliant, on a timely basis,
or if Year 2000 issues prevent others from the timely delivery of products,
services or systems to us, our business, results of operations and financial
condition could be materially adversely affected.
 
   
    We sell computer-related services, so our risk of lawsuits relating to Year
2000 issues is likely to be greater than that of companies in some other
industries. Because computer products and services may incorporate components
from different providers, it may be difficult to determine which component may
cause a Year 2000 problem. In addition, USI's acquired subsidiaries have several
contracts which make Year 2000 warranties with respect to the software provided
or developed under the contracts that are broader than the warranties provided
by the original manufacturers of the software. The potential liability arising
from these warranties is not capped. As a result, we may be subjected to Year
2000-related lawsuits whether or not our products and services are Year 2000
compliant. We cannot be certain at this time what the outcomes or impact of any
such lawsuits may be.
    
 
WE HAVE NO PLANS TO PAY CASH DIVIDENDS ON OUR COMMON STOCK IN THE FORESEEABLE
  FUTURE.
 
    Whether or not we declare or pay dividends is up to the Board of Directors
and will depend on a number of factors, including our earnings, capital
requirements and overall financial condition. In addition, our ability to
declare and pay dividends may be substantially restricted under the terms of our
credit agreements.
 
OUR PRINCIPAL STOCKHOLDERS, EXECUTIVE OFFICERS AND DIRECTORS WILL CONTINUE TO
  CONTROL THE COMPANY.
 
    When this offering is completed, our executive officers, directors and
existing greater-than-5% stockholders (and their affiliates) will, in the
aggregate, own shares representing approximately       % of our outstanding
voting capital stock. As a result, these persons, acting together, will be able
to control all matters submitted to our stockholders for approval (including the
election and removal of directors and any merger, consolidation or sale of all
or substantially all of our assets), and to control our management and affairs.
 
A SUBSTANTIAL NUMBER OF SHARES ARE ELIGIBLE FOR FUTURE SALE.
 
    After this offering is completed,             shares of Common Stock
(assuming no exercise of the Underwriters' over-allotment option) will be issued
and outstanding. All of the shares of Common Stock
 
                                       13
<PAGE>
sold in this offering will be freely tradeable under the Securities Act unless
purchased by our "affiliates," as that term is defined in the Securities Act. In
connection with this offering, our officers and directors and some of our
stockholders will be required not to sell any shares of Common Stock for a
period of 180 days after the date of this Prospectus without the written consent
of Credit Suisse First Boston Corporation. We cannot be sure what effect, if
any, future sales of shares or the availability of shares for future sale will
have on the market price of the Common Stock. The market price of our Common
Stock could drop due to sales of a large number of shares or our Common Stock in
the market after this offering or the perception that such sales could occur.
These factors could also make it more difficult to raise funds through future
offerings of Common Stock.
 
THERE IS NO PRIOR PUBLIC MARKET FOR OUR STOCK AND OUR STOCK PRICE COULD BE
  VOLATILE.
 
    There has not been a public market for the Common Stock. We cannot be sure
that an active public market for the Common Stock will develop or continue after
this offering. Prices for the Common Stock will be determined in the marketplace
and may be influenced by many factors, including variations in our financial
results, changes in earnings estimates by industry research analysts, investors'
perceptions of us and general economic, industry and market conditions. The
initial public offering price per share of the Common Stock has been determined
by negotiations among us and the representatives of the Underwriters. Investors
may not be able to sell their Common Stock at or above the initial public
offering price.
 
    We believe that there are relatively few comparable companies that have
publicly-traded equity securities. This may also affect the trading price of the
Common Stock after this offering. In addition, the stock market has from time to
time experienced extreme price and volume volatility, and this volatility may
adversely affect the market price of the Common Stock.
 
PURCHASERS IN THIS OFFERING WILL EXPERIENCE DILUTION.
 
    Purchasers of Common Stock offered hereby will experience immediate and
substantial dilution in the net tangible book value of the Common Stock.
 
WE ARE UNCERTAIN ABOUT THE RELIABILITY OF MARKET DATA.
 
    Market data used throughout this Prospectus were obtained from internal
company surveys and industry publications. Industry publications generally state
that the information contained therein has been obtained from sources believed
to be reliable, but that the accuracy and completeness of such information is
not guaranteed. Although we believe such information to be reliable, we have not
independently verified such market data. Similarly, internal company surveys,
while believed by us to be reliable, have not been verified by any independent
sources.
 
THIS PROSPECTUS CONTAINS FORWARD-LOOKING STATEMENTS.
 
   
    This Prospectus contains certain forward-looking statements (as such term is
defined in the Private Securities Litigation Reform Act of 1995) and information
relating to us, our industry and the U.S. and international Internet and systems
integration businesses that is based on the beliefs of our management, as well
as assumptions made by and information currently available to our management.
When used in this Prospectus, the words "estimate," "project," "believe,"
"anticipate," "intend," "expect" and similar expressions are intended to
identify forward-looking statements. Such statements reflect our current views
with respect to future events and are subject to risks and uncertainties that
could cause actual results to differ materially from those contemplated in such
forward-looking statements, including those discussed under "Risk Factors."
Readers are cautioned not to place undue reliance on these forward-looking
statements, which speak only as of the date hereof. We do not undertake any
obligation to publicly release any revisions to these forward-looking statements
to reflect events or circumstances after the date hereof or to reflect the
occurrence of unanticipated events.
    
 
                                       14
<PAGE>
                                USE OF PROCEEDS
 
   
    We will receive net proceeds from the sale of the       shares of Common
Stock, at an assumed public offering price of       share, estimated to be
approximately       million ($      million if the underwriters' over-allotment
option is exercised in full), after deducting underwriting discounts and
commissions and estimated offering expenses we will owe. We intend to use these
proceeds mainly to continue expanding and enhancing our network, to add
additional services to our IMAP offerings, and for working capital and other
general corporate purposes. In addition, we will use some of the proceeds to pay
accrued dividends on our shares of convertible preferred stock. Some of the net
proceeds may also be used to repay current or future debts, fund acquisitions or
acquire complementary products or to obtain the right to use complementary
technologies. The amounts and timing of our actual expenditures will depend upon
numerous factors, including the status of our product development efforts,
marketing and sales activities, the amount of cash generated by our operations
and competition. Actual expenditures may vary substantially from these estimates
and we may find it necessary or advisable to reallocate the net proceeds within
the above-described categories or to use portions thereof for other purposes.
Pending application of the net proceeds as described above, we intend to invest
the net proceeds of this offering in short-term, investment-grade,
interest-bearing securities.
    
 
                                DIVIDEND POLICY
 
    We have never paid cash dividends on our Common Stock and have no plans to
do so in the foreseeable future. The declaration and payment of any dividends in
the future will be determined by the Board of Directors, in its discretion, and
will depend on a number of factors, including our earnings, capital requirements
and overall financial condition.
 
                                       15
<PAGE>
                                 CAPITALIZATION
 
   
    The following table sets forth: (1) the actual capitalization of USI as of
December 31, 1998; (2) pro forma capitalization after giving effect to: (a) the
conversion of 55,000 shares of Series A Preferred Stock into 99,000,000 shares
of Common Stock upon consummation of this offering, and (b) the conversion of
59,279 shares of Series B Preferred Stock into 148,196,400 shares of Common
Stock upon consummation of this offering; and (3) pro forma as adjusted
capitalization after giving effect to: (a) the pro forma capitalization
adjustments and (b) the consummation of this offering and the application of the
net proceeds therefrom. This table should be read in conjunction with the
financial statements of USI, ACR and IIT and the related notes thereto and other
financial information included in this Prospectus. See "Use of Proceeds,"
"Dividend Policy," and "Management's Discussion and Analysis of Financial
Condition and Results of Operations."
    
 
   
<TABLE>
<CAPTION>
                                                                                        DECEMBER 31, 1998
                                                                               -----------------------------------
                                                                                                        PRO FORMA
                                                                                ACTUAL     PRO FORMA   AS ADJUSTED
                                                                               ---------  -----------  -----------
<S>                                                                            <C>        <C>          <C>
                                                                                 (IN THOUSANDS, EXCEPT FOR SHARE
                                                                                            AMOUNTS)
Cash and cash equivalents....................................................  $  43,802   $  43,802
                                                                               ---------  -----------  -----------
                                                                               ---------  -----------  -----------
Long-term liabilities:
  Short-term obligations expected be refinanced..............................      7,000       7,000        7,000
  Long-term debt and capital lease obligations...............................      8,659       8,659        8,659
  Dividends payable..........................................................      1,503       1,503       --
                                                                               ---------  -----------  -----------
  Total long-term liabilities................................................     17,162      17,162       15,659
Series B Cumulative Convertible Redeemable Preferred Stock, $.01 par value;
  115,000 shares authorized; 59,279 shares issued and outstanding actual, no
  shares issued and outstanding pro forma and pro forma as adjusted(1).......     62,242      --           --
Common Stock subject to repurchase, 10,750,000 shares(2).....................      4,145       4,145       --
Stockholders' equity (deficit):
  Series A Cumulative Convertible Preferred Stock, $.01 par value; 110,000
    shares authorized; 55,000 shares issued and outstanding actual, no shares
    issued and outstanding pro forma and pro forma as adjusted...............          1          --       --
  Common stock, $.001 par value; 600,000,000 shares authorized; 5,000,000
    shares issued and outstanding actual, 252,196,400 issued and outstanding
    pro forma and       shares issued and outstanding pro forma as
    adjusted(3)..............................................................          5         252       --
Additional paid-in capital...................................................     35,625      97,620       --
Accumulated deficit..........................................................    (37,087)    (37,087)      --
                                                                               ---------  -----------  -----------
  Total stockholder's equity (deficit).......................................     (1,456)     60,786
                                                                               ---------  -----------  -----------
    Total capitalization.....................................................  $  82,093   $  82,093
                                                                               ---------  -----------  -----------
                                                                               ---------  -----------  -----------
</TABLE>
    
 
- --------------------------
   
(1) Series B Preferred Stock is not presented as a part of stockholders' equity
    of the Company because it is mandatorily redeemable upon the eighth
    anniversary of its issuance. Each outstanding share of our Preferred Stock
    will convert into shares of Common Stock upon the closing of this offering.
    See "Description of Capital Stock" and Note 10 of the Notes to USI's
    Consolidated Financial Statements.
    
 
   
(2) Common Stock subject to repurchase represents 10,750,000 shares of Common
    Stock held by three officers that upon death or disability must be
    repurchased by the Company at fair value. See Note 11 of the Notes to USI's
    Consolidated Financial Statements.
    
 
   
(3) Does not include: (a) the 13,458,000 shares of Common Stock issuable upon
    exercise of stock options outstanding as of December 31, 1998 at an exercise
    price of $0.33 per share; and (b) 11,861,317 shares of Common Stock reserved
    for issuance upon exercise of warrants exercisable as of December 31, 1998.
    See "Management--Stock Option Plan".
    
 
                                       16
<PAGE>
                                    DILUTION
 
   
    Purchasers of the Common Stock offered hereby will experience immediate and
substantial dilution in the net pro forma tangible book value per share of their
Common Stock. At December 31, 1998, our net pro forma tangible book value was
approximately $34.6 million, or $0.14 per share of Common Stock. The net pro
forma tangible book value per share is equal to our total tangible assets less
total liabilities, divided by the number of shares of Common Stock outstanding
at December 31, 1998, after giving effect to the conversion of convertible
preferred stocks upon consummation of this offering. After giving effect to the
sale of       shares at an assumed initial public offering price of $      per
share and after deducting underwriting discounts and commissions, our pro forma
net tangible book value at       , 1998 would have been approximately $
million, or $  per share. This represents an immediate increase in pro forma net
tangible book value of $      per share to existing stockholders and an
immediate dilution of $      per share to new investors purchasing shares of
Common Stock in this offering. Dilution to new investors is determined by
subtracting pro forma net tangible book value per share of Common Stock after
giving effect to this offering, from the price to be paid by new investors in
this offering for a share of Common Stock. The following table illustrates the
per share dilution to investors in this offering:
    
 
   
<TABLE>
<CAPTION>
                                                                                              PER SHARE
                                                                                             -----------
<S>                                                                                          <C>          <C>
Assumed offering price.....................................................................                $
Net tangible book value as of December 31, 1998............................................   $    0.14
Pro Forma increase attributable to new investors in this offering..........................   $
                                                                                             -----------
Pro forma net tangible book value after this offering                                                      $
                                                                                                          -----------
Pro Forma dilution to new investors in this offering.......................................                $
                                                                                                          -----------
                                                                                                          -----------
</TABLE>
    
 
    The following table summarizes on a pro forma basis as of December 31, 1998,
after giving effect to this offering, the number of shares of Common Stock
purchased from us, the total consideration paid to us and the average
consideration paid per share by the existing stockholders and by the new
investors in this offering:
 
<TABLE>
<CAPTION>
                                                           SHARES PURCHASED        TOTAL CONSIDERATION
                                                        -----------------------  ------------------------
<S>                                                     <C>         <C>          <C>          <C>          <C>
                                                                                 AMOUNT (IN                AVERAGE PRICE
                                                          NUMBER      PERCENT    THOUSANDS)     PERCENT      PER SHARE
                                                        ----------  -----------  -----------  -----------  -------------
Existing stockholders.................................                        %                         %    $
Investors in this offering............................
                                                        ----------         ---   -----------         ---
  Total...............................................
                                                        ----------         ---   -----------         ---
                                                        ----------         ---   -----------         ---
</TABLE>
 
    The foregoing tables are based on shares outstanding as of December 31, 1998
and exclude 13,458,000 shares of Common Stock reserved for issuance under our
stock option plan, all of which shares were subject to outstanding vested
options as of December 31, 1998, and 11,861,317 shares of Common Stock issuable
upon the exercise of outstanding warrants. If all such options eligible for
exercise and warrants had been exercised at December 31, 1998, dilution to the
new investors in this offering would be $  per share.
 
                                       17
<PAGE>
   
                SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA
    
 
   
    The following table setting forth our summary historical consolidated
financial data for the period from January 14, 1998 (date of inception) through
December 31, 1998 and as of December 31, 1998, has been derived from, and is
qualified by reference to, our audited Consolidated Financial statements
included elsewhere in this Prospectus. The information set forth below should be
read in conjunction with "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and the financial statements of USI, ACR
and IIT and related notes thereto included in this Prospectus.
    
 
<TABLE>
<CAPTION>
                                                                                                  PERIOD FROM
                                                                                               JANUARY 14, 1998
                                                                                              (DATE OF INCEPTION)
                                                                                                      TO
                                                                                               DECEMBER 31, 1998
                                                                                             ---------------------
<S>                                                                                          <C>
                                                                                                  (AMOUNTS IN
                                                                                                  THOUSANDS,
                                                                                               EXCEPT PER SHARE
                                                                                                     DATA)
OPERATING STATEMENT DATA:
Revenue....................................................................................       $     4,122
Expenses...................................................................................           (34,020)
                                                                                                     --------
Operating loss.............................................................................           (29,898)
Other income (expense):
  Interest income..........................................................................               367
  Interest expense.........................................................................            (2,681)
                                                                                                     --------
Net loss during the development stage......................................................           (32,212)
                                                                                                     --------
                                                                                                     --------
Basic and diluted loss per common share attributable to common stockholders, pro forma for
  the conversion of the Series A Preferred Stock and Series B Preferred Stock..............             (0.46)
 
OTHER DATA:
  EBITDA(1)................................................................................       $   (27,728)
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                                               DECEMBER 31,
BALANCE SHEET DATA:                                                                1998
                                                                              --------------
<S>                                                                           <C>
                                                                               (AMOUNTS IN
                                                                                THOUSANDS)
  Cash and cash equivalents.................................................    $   43,802
  Working capital...........................................................        24,269
  Total assets..............................................................       107,527
  Long-term debt and capital lease obligations, excluding current portion...         8,659
  Series B Convertible Redeemable Preferred Stock(2)........................        62,242
  Common Stock subject to repurchase(3).....................................         4,145
  Stockholders' equity (deficit)............................................        (1,457)
</TABLE>
    
 
- ------------------------
 
   
(1) EBITDA consists of loss before interest and financing expense (net of
    interest income), income taxes, depreciation and amortization. EBITDA is not
    a measurement of financial performance under generally accepted accounting
    principles and should not be considered as an alternative to, or more
    meaningful than, net income or loss as a measure of performance or cash flow
    as a measure of liquidity. It may be calculated differently from EBITDA for
    other companies.
    
 
   
(2) Series B Preferred Stock is not presented as a part of stockholders' equity
    of the Company because it is mandatorily redeemable upon the eighth
    anniversary of its issuance. Each outstanding share of our Preferred Stock
    will convert into shares of Common Stock upon the closing of this offering.
    See "Description of Capital Stock" and Note 10 of the Notes to USI's
    Consolidated Financial Statements.
    
 
   
(3) Common Stock subject to repurchase represents 10,750,000 shares of Common
    Stock held by three officers that upon death or disability must be
    repurchased by the Company at fair value. See Note 11 of the Notes to USI's
    Consolidated Financial Statements.
    
 
                                       18
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
   
    THE FOLLOWING DISCUSSION AND ANALYSIS SHOULD BE READ IN CONJUNCTION WITH THE
FINANCIAL STATEMENTS OF USI, ACR AND IIT AND THE RELATED NOTES THERETO INCLUDED
IN THIS PROSPECTUS. THE DISCUSSION IN THIS PROSPECTUS CONTAINS FORWARD-LOOKING
STATEMENTS THAT INVOLVE RISKS AND UNCERTAINTIES, SUCH AS STATEMENTS OF OUR
PLANS, OBJECTIVES, EXPECTATIONS AND INTENTIONS. THE CAUTIONARY STATEMENTS MADE
IN THIS PROSPECTUS SHOULD BE READ AS BEING APPLICABLE TO ALL RELATED
FORWARD-LOOKING STATEMENTS WHEREVER THEY APPEAR IN THIS PROSPECTUS. OUR ACTUAL
RESULTS COULD DIFFER MATERIALLY FROM THOSE ANTICIPATED IN SUCH FORWARD-LOOKING
STATEMENTS. FACTORS THAT COULD CAUSE OR CONTRIBUTE TO SUCH DIFFERENCES INCLUDE
THOSE DISCUSSED IN "RISK FACTORS," AS WELL AS THOSE DISCUSSED ELSEWHERE HEREIN.
THE FORWARD-LOOKING STATEMENTS CONTAINED HEREIN ARE MADE AS OF THE DATE OF THIS
PROSPECTUS, AND WE ASSUME NO OBLIGATION TO UPDATE SUCH FORWARD-LOOKING
STATEMENTS OR TO UPDATE THE REASONS ACTUAL RESULTS COULD DIFFER MATERIALLY FROM
THOSE ANTICIPATED IN SUCH FORWARD-LOOKING STATEMENTS. SEE "RISK FACTORS."
    
 
OVERVIEW
 
    We have developed an advanced, integrated service offering that provides our
clients the ability to use leading business software applications through our
state-of-the-art Internet-based network. Since our inception in January 1998, we
have devoted substantially all of our efforts to developing our network
infrastructure, recruiting and training personnel, establishing strategic
business partnerships with application software providers, completing two
strategic acquisitions and raising capital. We have incurred a cumulative net
loss since inception and expect to incur additional losses for at least the next
twelve months, due primarily to additional start-up costs related to
implementation of our services and the continued expansion and enhancement of
our network. As of December 31, 1998, we had accumulated net losses of
approximately $32.2 million.
 
    REVENUE.  We expect that future revenue will be generated primarily from the
delivery of IMAP services. Revenue from IMAP services will consist of monthly
recurring fees from ongoing services and will be recognized ratably as earned
over the contract term. Non-refundable client deposits, if any, will be
recognized as revenue ratably over the contract term. Revenue from the delivery
of professional IT services will be recognized as services are performed.
 
    COSTS AND EXPENSES.  We will incur operating costs and expenses related to
the delivery of IMAP services. Costs and expenses will include product
development, network and data center support, selling and marketing, and general
and administrative expenses. Since inception, we have incurred expenses
consisting primarily of compensation and benefits, recruiting, occupancy and
consulting. We have expensed all start-up costs as incurred.
 
   
    We will incur certain up-front costs related to the delivery of IMAP
services. Product development costs and the cost to operate our network and data
centers will be recognized as period costs. Costs related to the acquisition of
hardware will be capitalized and depreciated over the estimated useful life of
the hardware of five years. Costs related to the acquisition of software
licenses will be capitalized and amortized over either the term of the license
agreement, or the term of the individual client contract, depending on the
nature of the software license agreement. Amortization will be based on current
and future revenue from each product and annual amortization will not be less
than that computed on a straight-line basis over the remaining useful life.
Direct costs related to the integration of software applications for a client on
our network will be capitalized and amortized over the related contract period.
    
 
ACQUIRED COMPANIES
 
   
    The acquisitions of IIT and ACR were made primarily with cash and were
accounted for using the purchase method of accounting. The assets and
liabilities of the acquired companies have been recorded at their fair market
value as of the acquisition closing date. The excess of the purchase price over
the fair market value of the identifiable net assets of IIT and ACR has been
accounted for as goodwill, which is being amortized over its estimated useful
life of 15 years.
    
 
                                       19
<PAGE>
HISTORICAL RESULTS OF OPERATIONS
 
    REVENUE.  For the period ending December 31, 1998, we generated $4.0 million
in professional IT services revenue primarily from ACR and IIT. The remaining
revenue during the period was generated through IMAP clients.
 
   
    COSTS AND EXPENSES.  We incurred $2.5 million in the delivery of
professional IT services for the period ending December 31, 1998. Our remaining
costs of revenues for the period ending December 31, 1998 were the costs
associated with the delivery of our IMAP products. These costs, which include
the operations of our network and data centers, and the amortization of customer
specific hardware, software and integration costs, totaled $4.2 million for the
period.
    
 
    For the period January 14, 1998 (inception) through December 31, 1998, we
incurred $25.2 million of selling, general and administrative expenses. These
expenses relate to our development stage activities and consist principally of
compensation, benefits, recruiting, occupancy, consulting services and network
costs prior to the implementation of the first IMAP client.
 
   
    We recorded a deferred tax asset of $11.2 million as of December 31, 1998.
This deferred tax asset consisted principally of start-up costs capitalized for
income tax purposes and employee compensation not currently deductible for
income tax purposes. We have established a valuation allowance for the entire
amount of our deferred tax asset due to uncertainties regarding future taxable
income.
    
 
LIQUIDITY AND CAPITAL RESOURCES
 
   
    At December 31, 1998, we had cash and cash equivalents of $43.8 million
primarily generated through the sale of $32.8 million of Series A Preferred
Stock and $62.0 million of Series B Preferred Stock, after deducting issuance
costs. Through December 31, 1998 we have used $20.6 million through operating
activities and $37.7 million in investing activities. The principal investing
activities were the acquisitions of ACR and IIT for $16.9 million and the
purchase of property and equipment totaling $20.1 million.
    
 
    USI has used debt and capital leases to partially finance its capital
purchases and plans to continue this practice for the foreseeable future. As of
December 31, 1998, we had obtained commitments for secured financing from
several sources including: Cisco System Capital Corporation ($10.0 million),
Venture Lending & Leasing II, Inc. ($10.0 million), Transamerica Business Credit
Corporation ($5.0 million), Leasing Technologies International, Inc. ($2.0
million) and Hewlett Packard Company ($1.0 million), among others. The total of
the secured financing commitments at December 31, 1998 was $30.1 million, of
which $13.7 had been funded.
 
    We believe that these resources, together with the estimated net proceeds
from this offering, will provide sufficient funds for the implementation of
client contracts, to purchase required capital equipment, and to fund our
operations for the next several years. If we grow beyond current expectations or
identify one or more attractive acquisitions, or our cash flow from operations
is insufficient to meet our working capital and capital expenditure
requirements, we will need to raise additional capital from equity or debt
sources. We cannot be sure that we will be able to obtain the additional
financing to satisfy our cash requirements or to implement our growth strategy
on acceptable terms or at all. If we cannot obtain such financing on terms
acceptable to us, we may be forced to curtail our planned business expansion and
may be unable to fund our ongoing operations.
 
    RECENT ACCOUNTING PRONOUNCEMENTS
 
    In March 1998, the American Institute of Certified Public Accountants issued
Statement of Position 98-1, ACCOUNTING FOR THE COSTS OF COMPUTER SOFTWARE
DEVELOPED FOR OR OBTAINED FOR INTERNAL USE (SOP 98-1). This SOP requires the
capitalization of costs to purchase or develop internal-use software, including
external direct costs of materials and services, payroll and payroll related
costs for employees who are directly associated with and devote time to an
internal-use software development project. Allocations of overhead to
capitalized costs are not permitted. Computer software costs related to research
and development are expensed as incurred, as are training and maintenance costs.
SOP 98-1 is effective for
 
                                       20
<PAGE>
years beginning after December 15, 1998 and application is prospective. Through
December 31, 1998, we expensed all costs related to the implementation of
internal use software. We will adopt SOP 98-1 in the first quarter of 1999.
 
    In April 1998, the American Institute of Public Accountants issued Statement
of Position 98-5, REPORTING THE COSTS OF START-UP ACTIVITIES (SOP 98-5). This
SOP requires that start-up costs and organizational costs be expensed as
incurred. Start-up activities include one-time activities related to opening a
new facility, introducing a new product or service, conducting business in a new
territory, conducting business with a new class of customer, initiating new
process in an existing facility, or commencing some new operation. SOP 98-5 is
effective for years beginning after December 15, 1998. We currently expense the
costs of all start-up and organizational activities.
 
    YEAR 2000 COMPLIANCE
 
    YEAR 2000 ISSUE.  The Year 2000 issue is a result of computer programs or
systems which store or process date-related information using only two digits to
represent the year. These programs or systems may not be able to properly
distinguish between a year in the 1900's and a year in the 2000's. Failure of
these programs or systems to distinguish between the two centuries could cause
the programs or systems to yield erroneous results or even to fail.
 
    STATE OF READINESS.  Since its inception in January 1998, USI has been
cognizant of the Year 2000 issue. Hardware and software selections, network
architecture, and client contract terms have all been designed with the Year
2000 issue in mind. As a result, in our core IMAP business we believe that we do
not have a Year 2000 problem, with the exception of one hardware platform which
we are currently bringing into compliance.
 
   
    The companies we recently acquired (IIT and ACR) have been in existence
longer than we have. Management of USI concluded, based on Year 2000 assessments
performed for IIT and ACR, that there are no material exposures related to the
hardware or software used by the acquired companies.
    
 
   
    USI recognizes the significance of the Year 2000 issue and plans to
implement a formal Year 2000 Program in the first quarter of 1999. The Year 2000
Program will address both information technology and non-IT systems, for systems
used by USI as well as those provided by the USI to its clients. A Year 2000
Team, which includes members from all levels of management, will be led by our
Engineering and Operations organization to implement the Year 2000 Program. The
Year 2000 Team will meet as a group on a regular basis, and subgroups of the
team will meet as needed to address specific issues.
    
 
    USI is using employees to identify and address the Year 2000 issue. The Year
2000 Program will involve six basic stages.
 
    - Inventory of all potentially affected software products and
      software-related services.
 
    - Analysis of such products and services to identify any areas that require
      change or replacement.
 
    - Change or replacement of the identified areas.
 
    - Testing.
 
    - Implementation of the changes or replacements.
 
    - Contingency plans.
 
    Because USI is not only a user of software products and software-related
services, but also provides software products and software-related services to
its clients, USI's Year 2000 Program will address both software products and
software-related services used by USI and those provided by USI to its clients.
 
   
    While different areas of USI face different Year 2000 problems, USI has
given priority to software products and software-related services that it
provides to its clients. USI has had in depth discussions with all of its
software suppliers. We have received assurances from all our software suppliers
that these programs are in compliance, and we do not believe that any of the
software applications provided to clients requires remediation. The acquired
companies also write some software for client's applications. Client
applications provided in recent years have been tested for Year 2000 compliance.
The Year 2000 Team will
    
 
                                       21
<PAGE>
determine if additional analysis, remediation, testing or implementation are
required. USI plans to substantially complete implementation of any necessary
changes and replacements to software products and software-related services used
and provided by USI by the end of the third quarter of 1999. We are also
implementing procedures to ensure that any future software products and
software-related services, as well as enhancements to existing software products
and software-related services are developed in accordance with USI's Year 2000
Program.
 
    In the course of our business, USI uses certain software products provided
by third-parties, and certain of USI's products and services interface to
third-party systems. USI has received information from various other third-party
providers regarding the Year 2000 readiness of their products and it continues
to review such information. USI is also sending requests to other third parties
for information regarding the Year 2000 readiness of their products and systems.
As USI does not have any control over these third parties, it cannot guarantee
that such third-party products and systems will not suffer any adverse effects
due to the Year 2000 issue.
 
   
    COSTS.  As of December 31, 1998, USI has not incurred material expenses in
connection with its Year 2000 Program. All expenses relating to Year 2000
compliance to date have been incurred in the normal course of our business, as
we have developed our products, network, and implemented specific client
applications. The cost of completing the Year 2000 Program is expected to be
principally in the form of the opportunity costs of employees' time. USI may
also need to purchase replacement products, though it does not currently expect
that this will prove necessary. USI has not yet determined its projected costs
of the entire Year 2000 Program.
    
 
   
    RISKS.  If a product or service provided by USI is found to cause damage or
injury to a client due to a failure of such product or service to operate
without any adverse effect due to date related processing associated with the
year 2000, USI could be liable to such client for a breach of warranty,
depending on the specific contractual arrangement between USI and such client.
Although USI's contractual arrangement with each of its clients generally limits
USI's liability to such client, USI cannot accurately predict whether or to what
extent any legal claims will be brought against USI, or whether USI will
otherwise be adversely affected by such claims. In addition, USI's acquired
subsidiaries have several contracts which make Year 2000 warranties with respect
to the software provided or developed under the contracts that are broader than
the warranties provided by the original manufacturers of the software. The
potential liability arising from these warranties is not capped.
    
 
    In addition, a failure by USI to make our products Year 2000 compliant could
result in a decrease in sales of USI's products and services, delays in the
development of other of USI's products and services, an increase in the costs
associated with Year 2000 remediation, and an increase in litigation costs. The
Year 2000 issue may also have an indirect effect on our business and operations
to the extent that potential clients of USI may be using significant resources
to address the Year 2000 issue, and therefore may have fewer resources to
evaluate and purchase other products and services such as the products and
services offered by USI, which could have a material adverse effect on USI's
business, general condition and results of operation. If a material third-party
product or system which USI uses or interfaces with fails to operate properly
due to the Year 2000 issue, such failure could have a material adverse effect on
its business, financial condition and results of operations.
 
    CONTINGENCY PLAN.  Our Year 2000 Team will be prepared to address the Year
2000 issue. We plan to develop additional contingency plans, which will be
implemented if necessary. We expect to complete development of the contingency
plans by the end of the third quarter of 1999.
 
   
    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
    
 
   
    USI is exposed to market risk related to changes in interest rates. USI
invests excess cash balances in cash equivalents. In addition, USI's borrowing
arrangements are on fixed rate terms of varying maturities. USI believes that
the effect, if any, of reasonably possible near-term changes in interest rates
on USI's financial position, results of operations and cash flows is not
material.
    
 
                                       22
<PAGE>
                                    BUSINESS
 
ABOUT USI
 
    USI's service offerings make it possible for its clients to use leading
business software applications without the cost and burden of owning or managing
the underlying technology. Our clients access these applications through our
state-of-the-art Internet-based network. Our IMAP solutions integrate the
implementation, operations, communications and support of Internet-enabled
packaged software applications. USI has established its IMAP offerings as a
leading single-source solution for middle market enterprises implementing
distributed business functions such as sales force automation, customer support,
e-commerce, and human resource and financial systems. USI also provides Complex
Web Hosting by making its infrastructure available to clients who want to run
their own applications in a highly reliable and secure Internet environment.
 
MARKET TRENDS
 
    We believe that there are four key market trends that drive the business
opportunity for USI:
 
    - The rapid growth of Internet-based communications and the outsourcing of
      Web Sites.
 
    - The competitive need of middle market enterprises to automate key business
      processes.
 
    - The availability of Internet-enabled packaged software applications.
 
    - The need for an integrated approach to providing these services.
 
THE RAPID GROWTH OF INTERNET-BASED COMMUNICATIONS AND THE OUTSOURCING OF WEB
SITES.
 
    An increasing number of companies use the Internet to enable fast and
efficient communications between various constituents of their enterprises. For
example:
 
    - E-commerce is becoming a critical element of many businesses' strategies.
      Companies increasingly demand that their vendors communicate ordering,
      invoicing and payment transactions through Internet-enabled applications.
      Forrester Research, Inc. forecasts that Internet commerce revenues will
      grow from approximately $10 billion in 1997 to $183 billion by 2001.
 
    - Enterprises are relying on the Internet to communicate with employees who
      are increasingly dispersed due to globalization and the development of
      alternative workplaces. According to Forrester Research, Inc. there are
      between 30 and 40 million telecommuters or home-based workers in the
      United States.
 
    - To interact with customers, suppliers and remote employees efficiently, an
      increasing number of businesses are implementing mission-critical
      applications over intranets and extranets rather than through dedicated
      private networks. Forrester Research, Inc. forecasts that the increasing
      demand for corporate intranets and extranets will fuel growth rates in
      excess of 30% in distributed infrastructure services resulting in a $140
      billion market in 2002.
 
    As more companies implement mission-critical business applications on the
Internet, the demand for outsourced provision of key Internet infrastructure and
services, or Web Hosting, has significantly increased. The outsourcing of Web
Sites is occurring because businesses recognize that they do not have an
infrastructure sufficient to ensure reliable and responsive deployment of
mission-critical applications on the Internet. In an April 1998 report,
Forrester Research, Inc. cited scalability, speed and availability as the key
network concerns among Fortune 1000 companies. Web Site hosting providers
address these concerns by building substantial redundancy and capacious network
bandwidth into their facilities. Moreover, they provide a physically secure data
center environment, which helps to address businesses' security concerns as they
begin to move proprietary business information over the Internet.
 
                                       23
<PAGE>
THE COMPETITIVE NEED OF MIDDLE MARKET ENTERPRISES TO AUTOMATE KEY BUSINESS
PROCESSES.
 
    Middle market enterprises increasingly face competitive demands to automate
business processes, but have frequently not been able to afford the
functionality available to their larger competitors. This has been exacerbated
by the shortage of IT professionals. We believe that these enterprises have a
significant need for packaged application software to improve core business
processes, reduce costs and enhance their global competitive position.
 
    We believe that many of the leading ERP software packages remain too complex
and too costly to be effective solutions for middle market companies. While many
ERP providers have begun offering products that are targeted for the middle
market (for example, PeopleSoft Select, aSAP and Oracle Fast Forward),
implementation of these packages still generally requires specialized skill sets
and frequently takes three to twelve months. In addition, the infrastructure
required to support these packages once implemented is also beyond the
capabilities of many middle market businesses. Faced with these costs and time
frames, many middle market companies choose to forgo the capabilities of leading
ERP packages in favor of less functional products. We believe that a lower cost,
more easily implemented approach would allow these middle market businesses to
capitalize on the functionality of leading ERP packages and better position
these businesses against larger competitors.
 
THE AVAILABILITY OF INTERNET-ENABLED PACKAGED SOFTWARE APPLICATIONS.
 
    Until recently, companies wanting to implement Internet applications had to
develop their own software applications or customize existing packages. This
made each implementation unique and costly. It also made implementation time
frames and costs unpredictable. Over the past two years, however, major packaged
application providers, such as Oracle, Siebel, PeopleSoft, Lawson and others,
have Internet-enabled their software. This is particularly true for providers of
applications for distributed users such as e-commerce, ERP applications, and
sales force automation, where the increasing ubiquity of the Internet makes it a
cost-efficient mechanism for implementing distributed functions.
 
    We believe that the availability of Internet-enabled packaged software makes
it possible, for the first time, to implement these applications on the Internet
in predictable time frames, with predictable costs, and without writing custom
code.
 
THE NEED FOR AN INTEGRATED APPROACH TO PROVIDING THESE SERVICES.
 
    Forrester Research, Inc. reports that the overall market for outsourcing
packaged software applications will grow from approximately $1 billion in 1997
to over $21 billion by 2001. Furthermore, according to Forrester Research, Inc.,
U.S. firms are now spending approximately a quarter of their overall IT budgets
on outsourcing services. These services include packaged application software
implementation and support, customer support and network development and
maintenance. Reasons for the growth in outsourcing include:
 
    - The lack of available IT professionals.
 
    - The challenges faced by a non-technical company in hiring, motivating and
      retaining qualified application engineers and IT employees.
 
    - The desire by companies to focus on their core business.
 
    - The difficulties that businesses experience in developing and maintaining
      their networks and software applications.
 
    - The fast pace of technical change that shortens time to obsolescence and
      increases capital expenditures as companies attempt to keep up with
      leading-edge technologies.
 
                                       24
<PAGE>
Enterprises faced with these problems have traditionally sought solutions from a
variety of information technology providers including system integrators, ISPs,
hardware and software vendors, and telecommunication companies. Thus, these
companies have had to deal with at least three independent suppliers-a software
applications provider, a systems integrator, and a site hosting provider-or have
had to support implementation with in-house resources. There are inherent
conflicts and difficulties with this approach, as each supplier is dedicated to
providing its own specific product or service with only limited knowledge of the
bundle of products and services required to provide the complete business
solution. USI believes that these trends create a substantial market opportunity
for a single-source solution that combines software from multiple vendors,
hardware, systems integration and Internet-based communications in an integrated
service offering.
 
THE USI SOLUTION
 
    USI believes that it is well positioned to take advantage of these trends.
We have established our IMAP services as a leading single-source solution for
the Internet-enabled application software needs of middle market enterprises. We
take responsibility for the deployment and maintenance of the IMap best-of-breed
packaged software applications, allowing our clients to focus on their core
competencies without mediating among disparate vendors. USI's IMap solutions
enable clients to buy these mission-critical functions as a service from a
single vendor, rather than as a collection of technologies from multiple
vendors.
 
    USI has teamed with major packaged application software providers to
implement its IMAP offerings. USI has built a network of EDCs through which its
clients' business software applications are deployed. The network offers fast,
reliable and secure access to USI-managed client application Web Sites, which
serve as the "Internet gateways" for enterprises and their employees, customers
and partners to access and use business application software and data. The
servers are procured and maintained by USI and dedicated to specific clients.
Clients can define specific groups, such as their sales force, customers, or
investors, to have full or limited access to their Web Sites. Because USI's
network is deployed globally, access to customer applications can be equally
responsive in North America, Europe, and Asia. Moreover, backup across disparate
geographies is designed to ensure reliability and data integrity. USI provides
packaged application software and support along with its services on the basis
of multi-year contracts paid on a monthly basis. We believe that the combination
of our Internet communications capability along with Internet-enabled software
applications makes our IMAP offerings the first truly integrated Internet
communications and computing solution.
 
   
DELIVER INTEGRATED SERVICE OFFERINGS AROUND BUSINESS PROCESSES
    
 
    We have built and acquired expert product teams that specialize in
implementing IMAP solutions to support specific business processes. USI's
Consulting and Implementation (C&I) teams have specific expertise in
implementing our IMAP solutions for sales force automation, supply chain
management, human resource management, e-commerce, decision support, customer
service and core financials. Each team has the capability to integrate a
specific application software package and the required Internet communications
services, which together provide a total solution for a specific business
process. These teams can implement applications and generate value for customers
very quickly. For example, our typical implementation of Siebel technology is
designed to be completed in 45 days. We believe that this provides a competitive
advantage versus a more conventional implementation of six months to more than a
year. The C&I teams hand off the implemented application to USI's Operations
group, which runs and maintains the application as well as provides ongoing
support to USI's customer through its Client Care organization.
 
                                       25
<PAGE>
   
LEVERAGE STRATEGIC RELATIONSHIPS WITH LEADING SOFTWARE APPLICATION PROVIDERS
    
 
   
    USI has established relationships with vendors in key application areas,
including Siebel in sales force automation, customer service and enterprise
marketing; PeopleSoft in human resources and financials; Sagent in decision
support; and BroadVision in e-commerce. USI is the exclusive outsource provider
of Seibel ERM application hosting and rental services for direct customers of
Siebel headquartered in North America and is one of nine currently certified
outsourcing partners for PeopleSoft. The agreements with software providers
generally enable us to deploy the applications as a service, without the need to
establish a separate licensing arrangement for each client. The agreements also
enable us to provide our clients with an economically attractive service
offering, and afford us co-marketing and co-branding opportunities. These
agreements provide us with an initial software portfolio that can meet a broad
range of our clients' ERP, e-commerce, and communication needs. In addition, the
agreements provide us with an accelerated path to developing our expert product
teams around the software applications and business processes these applications
support.
    
 
   
OPERATE A SPECIALIZED GLOBAL NETWORK
    
 
   
    USI has constructed a highly reliable, fully redundant global network
specifically designed to support its IMAP solutions. The USI network is designed
to provide the fastest possible response time, the highest level of security and
99.9% availability to its clients. USI has EDCs in Annapolis, Maryland; Milpitas
(Silicon Valley), California; Amsterdam and Tokyo. These EDCs are monitored and
managed from our GEMC in Annapolis and a remote back-up GEMC in Milpitas. The
network is designed around dual primary backbones connecting our EDCs and GEMCs.
Our dedicated network is linked to the Internet in North America via six major
backbone providers, allowing the Company's customers to bypass congested public
exchange points. Large storage arrays in Annapolis and Milpitas provide
real-time back-up of North American client sites, enabling us to provide an
unusually high level of data integrity. We use our proprietary network
operations platform, USIView, to proactively manage and monitor our network
systems, telecommunications hardware, network connectivity, operating systems
and applications software.
    
 
   
IMPLEMENT SERVICES-BASED BUSINESS MODEL
    
 
    We sell our IMAP solutions as a service, not as a technology. Accordingly,
our clients sign long-term contracts with fixed monthly payments made as the
service is delivered. We believe that selling our IMap solutions as a service
reduces our clients' initial capital expenditures and makes it easier for
non-technical executives to purchase our products.
 
THE USI STRATEGY
 
    The focus of our strategy is to deliver timely, reliable and secure IMAP
services to each of our clients. We believe that by doing so we will rapidly
build our client base and secure long-term relationships with those clients. We
will also continue investing to maintain a value advantage over our competitors
and to capitalize on our first mover advantages, as follows:
 
    - INCREASE THE NUMBER OF SOFTWARE RELATIONSHIPS--USI plans to enter into
      strategic partnerships with additional application software vendors. This
      will enable us to expand our portfolio of IMAP solutions and reduce our
      reliance on any one software provider. USI sees opportunities in
      additional application areas, such as supply chain management, as well as
      in specific vertical market segments.
 
    - ENHANCE THE CAPACITY AND FUNCTIONALITY OF OUR GLOBAL NETWORK OF
      EDCS--Today, we provide European and Asian mirror sites to our clients
      from co-located EDCs in those geographies. As our client base expands, we
      intend to build dedicated EDCs in Europe and Asia to increase our
      capacity. Once these EDCs are built, we also intend to begin soliciting
      European and Asian source business. We also view the Latin American market
      as holding substantial potential.
 
                                       26
<PAGE>
    - ACQUIRE ADDITIONAL SYSTEMS INTEGRATORS--As we expand our offerings, we may
      acquire additional systems integrators to support the introduction of
      these service offerings. We have found that the easiest way to enter new
      application areas is to acquire existing businesses that focus on those
      applications. This approach not only brings a team with immediately
      relevant experience, it also brings reference accounts and the potential
      for cross-selling USI products to the acquired company's customer base.
 
IMAP OFFERINGS
 
    Our current IMAP offerings provide integrated solutions to meet the needs of
middle market clients implementing distributed business functions. These
solutions encompass four elements:
 
    - LEADING PACKAGED APPLICATION SOFTWARE.  USI'S application packages address
      major business process areas including e-commerce, sales force automation,
      human resource management, decision support, supply chain management, and
      core financials. USI has chosen to focus on mission-critical business
      processes that serve distributed users. These processes can gain maximum
      value from Internet implementations and from USI's infrastructure.
 
    - USI-MANAGED CLIENT APPLICATION WEB SITES AVAILABLE VIA USI's GLOBAL
      NETWORK.  USI-managed client application Web Sites are housed on dedicated
      USI-managed servers and available via a reliable, high-performance and
      secure global Internet network. Each content server in an EDC is procured
      and maintained by USI and is dedicated to a specific client. This is
      designed to ensure responsiveness and allows clients to define which
      groups will have full or limited access to the Web Site or server.
 
    - CONSULTING AND SYSTEMS INTEGRATION SERVICES.  IMAP consulting and system
      integration services define, develop and deliver the combination of
      hardware, network services, and application software that meet a specific
      customer's needs. Within the IMAP solutions, USI does not develop software
      nor does it implement substantial customization of existing packages.
      Rather, modular packages applications are configured to meet a customer's
      requirements.
 
    - INTEGRATED CLIENT SERVICE.  Once implemented, IMAP solutions are
      efficiently operated in USI's network of EDCs. 24x7 client support from
      dedicated teams with specific knowledge of each client implementation is a
      component of all IMAP solutions.
 
    In addition to the specific application areas that USI supports, we make our
infrastructure available to clients who want to implement their own applications
in a high-performance Internet environment. Clients for this complex Web Site
hosting realize all the reliability, security, and responsiveness benefits of
USI's network; however, USI takes no responsibility for the application itself.
We believe that many of USI's Complex Web Site Hosting clients intend to migrate
to a USI-supported application over time.
 
   
    Our IMAP contracts are generally not less than three years in length
(although client contracts signed pursuant to our agreement with Siebel may have
a term as short as six months and we foresee that some Web Site hosting
contracts may have shorter terms) and most provide for a modest initial payment.
The contracts are non-terminable, but do provide for payment reductions in the
event that agreed service levels are not met. As an inducement to attract
several of our earliest clients, we agreed to early termination clauses without
substantial penalties. We do not intend that these inducements to "lighthouse
accounts" become our standard practice.
    
 
STRATEGIC SOFTWARE VENDOR RELATIONSHIPS
 
    In developing our IMAP solutions, we have formed relationships with certain
market-leading software providers whose platforms support critical business
processes. These application providers include Siebel, PeopleSoft, BroadVision,
and Sagent. We believe that USI has proven to be an attractive partner for these
software companies because of our strategy to deliver integrated solutions to
middle market enterprises in
 
                                       27
<PAGE>
a cost-effective service model. Each of our software agreements is unique, but
most allow us to deploy packaged application software as a service without the
need to establish a separate licensing arrangement for each client. The
agreements also generally include co-marketing, specialized product training and
preferred pricing on the licenses to the software. USI plans to enter into
additional agreements with other software vendors over time.
 
    Each of USI's key application software relationships is described below.
 
   
    SIEBEL.  Siebel is the recognized leader in providing Enterprise
Relationship Management (ERM) applications, a range of product offerings that
includes sales force automation, customer service/help desk, and enterprise
marketing. USI and Siebel have entered into an agreement whereby USI is the
exclusive outsource provider of Siebel ERM application hosting and rental
services for direct customers of Siebel headquartered in North America.
    
 
   
    Our agreement with Siebel establishes a joint program in which the Siebel
sales force will offer outsourcing as a product option. While Siebel will, in
most instances, retain control of the application licensing, USI will implement
the application in its data center, provide on-going management and support, and
may provide its C&I services. ERM opportunities identified by USI's sales force
will be handled in the same manner. In return for the exclusivity of this
relationship, USI has agreed not to offer any competing ERM applications as part
of its IMAP solutions. The agreement mandates joint marketing programs, joint
oversight of, and agreement on, the program to sell ERM application outsourcing
services, and commissioning of both Siebel and USI sales representatives
participating in each sale.
    
 
    PEOPLESOFT.  USI and PeopleSoft have agreed to offer PeopleSoft human
resource and core financial applications as IMAP solutions. PeopleSoft is an
established leader in the ERP software industry and the recognized leader in
human resource management solutions. USI is one of nine currently certified
PeopleSoft outsourcing partners.
 
    Our agreement with PeopleSoft provides that outsourcing opportunities
identified by USI's sales force be jointly marketed and quoted. Opportunities
identified by the PeopleSoft sales force will be jointly marketed and quoted
with one of its certified outsourcing partners. Customers who elect outsourcing
through USI will purchase USI's IMAP solution. USI will pay PeopleSoft a
percentage of the total revenue received, in lieu of a standard licensing fee.
The agreement also provides for the sharing of rapid deployment methodologies,
complete 24x7 software support, the ability to joint market products and
services, shared visibility at industry events, sharing of sales leads and joint
training efforts.
 
    BROADVISION.  USI and BroadVision have agreed to offer BroadVision's
e-commerce application as an IMAP solution. BroadVision's e-commerce application
has been adopted by enterprises across a broad range of industries. The
agreement with BroadVision allows USI to offer a robust set of e-commerce
solutions for business-to-business and business-to-consumer commerce.
 
    Our agreement with BroadVision allows for attractive discounts on licenses.
Our arrangement with BroadVision also provides for flexible use of licenses
worldwide, sharing of development methodology, 24x7 technical support, joint
sales activity and co-marketing.
 
    SAGENT.  USI and Sagent have agreed to offer Sagent Enterprise Data Mart and
Decision Support Systems applications as an IMAP solution. Sagent is currently
fully prepared to service the emerging data warehousing market with its turnkey,
fully Internet-enabled, data warehousing solution. Oracle and Siebel have
selected Sagent as the exclusive data modeling and data movement technology upon
which their data warehouse products are based.
 
    Our agreement with Sagent allows for attractive discounts on licenses and
services and grants us the right to distribute the software as part of our IMAP
solution without the need to establish a separate licensing arrangement for each
client. The agreement also provides for flexible use of the licenses
 
                                       28
<PAGE>
worldwide, access to rapid deployment methodology, 24x7 software support, joint
marketing, visibility as a Sagent Premier Partner at industry events, shared
training resources, and sharing of sales leads.
 
    OTHER RELATIONSHIPS.  In addition to the applications described above, we
implement some e-commerce solutions based on Microsoft Site Server, pursuant to
a licensing agreement with Microsoft Corporation. We also implement many of our
IMAP solutions utilizing Oracle databases, pursuant to a licensing agreement
with Oracle. We have agreed to make Oracle our standard database for most of our
ERP implementations. In addition, USI and Oracle are discussing a potential
arrangement allowing USI to offer certain Oracle applications as part of our
IMAP solutions.
 
USI'S NETWORK
 
    We designed our global network specifically to provide superior performance
for the IMAP offerings. The USI global network was engineered around three core
design principles:
 
    - Provide uptime of 99.9% or better to the entire network, which includes
      the dedicated customer server.
 
    - Provide fast and predictable response time and access to customer content
      globally.
 
    - Provide reliable and customized network security.
 
NETWORK UPTIME
 
    The USI global network is designed to ensure 99.9% uptime by: (i) minimizing
integration of disparate vendors; (ii) utilizing component redundancy; (iii)
mirroring of client servers in separate EDCs; and (iv) the use of USIView, USI's
global end-to-end network management system. USI's network is designed around
Cisco networking hardware, which minimizes multi-vendor integration and reduces
the risks of hardware incompatibility and implementation delay. Cisco has
designated USI's network as a Cisco Powered Network, indicating that Cisco has
reviewed and approved the network design. USI's network architecture relies on
redundancy of network hardware, facilities infrastructure (such as power
supplies) and telecommunications circuits, which maximizes the network
availability. In addition, we have redundant EDCs, GEMCs, and wide-area networks
(WANs) connecting our EDCs. This WAN connection is used to dynamically mirror or
provide a duplicate site for each client at one of our other EDC locations. This
mirroring feature protects the site from downtime resulting from catastrophic
failure at a specific geographic location. For clients requiring real time
disaster recovery, USI utilizes storage arrays that enable real time data
mirroring and are designed to maintain the integrity of data to within one
second.
 
    The GEMC staff manages and monitors the network systems environment,
telecommunications hardware and data content servers in all of USI's EDCs, both
domestic and international, using USIView, USI's global network operations
technology, an end-to-end network management platform. USIView consists of an
integrated suite of scaleable software tools that allow the GEMC staff to
proactively monitor systems-level events, processes and thresholds. USIView is
the foundation of USI's systems and operations management strategy, providing us
with a unified configuration and change management method; an event correlation
facility that collects, processes, and responds to management event information
from a variety of sources; and a central repository for inventory and asset
management information.
 
FAST RESPONSE TIME
 
    In order to facilitate the faster response time, USI has designed its
network to avoid congestion areas on the Internet and specifically designed its
primary GEMC to support its integrated network. USI seeks to avoid the known
Internet congestion points at the Metro Area Exchanges (MAEs) and at the Network
Access Points (NAPs). In order to bypass the MAEs and NAPs, USI's network in
North America connects directly with six major Internet carriers' backbones,
which carry about 85% of all the traffic on the Internet today. Client data is
routed directly over an ISP's network to USI's network, bypassing such congested
 
                                       29
<PAGE>
public exchange points. Independent benchmarking has confirmed that USI's
network delivers Web-based content to end users from two to seven times faster
than many other major Web Site hosting providers.
 
NETWORK SECURITY
 
    Each EDC features multiple levels of security to isolate private information
from public information. Private network infrastructure is physically isolated
with cabling, switches, and routers separately maintained from the hardware for
the public network infrastructure. In addition, access to the EDCs and GEMCs is
restricted to authorized personnel by hand scan readers, which also monitor and
record entrances and departures. The public network and the private network have
minimal electronic or logical interconnection and are connected only through a
redundant firewall. The network also includes firewall products that enforce
data security and policy-based routing for clients who prefer secure access to
server resources. USI believes that these measures ensure complete separation
and security between its public and private networks.
 
SALES & MARKETING
 
    USI offers its products and services through a U.S.-based direct sales
organization. Each sales representative is responsible for a limited number of
client relationships. USI believes this approach enables its sales
representatives to understand each client's specific business needs thoroughly
and to provide top quality ongoing support. USI currently has 18 sales
representatives located throughout the United States. We intend to expand our
sales organization into all major U.S. markets.
 
    The USI sales teams target U.S.-based medium-sized enterprises with annual
revenues ranging from $50 million to $1.0 billion and selected divisions of
larger multi-national organizations. Our sales strategy emphasizes that IMAP
solutions enable clients to avoid extensive initial capital outlays, maintain
focus on their core businesses, reduce technical and integration risks, and
shorten implementation time for software applications.
 
   
    USI has developed programs to attract and retain high quality, motivated
sales representatives that have the technical skills and consultative selling
experience necessary to sell USI's IMAP solutions. In addition, USI's
acquisitions have augmented the sales and technical team, and have created
opportunities for more rapid market penetration in their geographic region and
access to established business relationships for cross selling.
    
 
    USI has established a marketing communications organization that is
responsible for the branding and marketing of all USI's IMAP solutions and for
distinguishing IMAP as a branded product offering. The marketing organization is
responsible for all new service launches to insure both internal execution and
marketplace acceptance. The marketing organization has developed cooperative
marketing and trade show participation programs in conjunction with USI's
strategic software and hardware partners.
 
   
    USI has entered into a marketing agreement with U S WEST Communications,
Inc., the incumbent local exchange carrier in fourteen western states. By the
terms of that agreement, U S WEST gains exclusive rights to market USI's IMAP
products in its fourteen-state region. USI makes its products available to U S
WEST at a discount, and provides technical support in the sale. The agreement
with respect to any IMAP offering can be canceled in the event that U S WEST
does not achieve an agreed quota of sales for that offering. Moreover, the
exclusive arrangement is not binding on any successor organization to USI.
    
 
ACQUISITION STRATEGY
 
    USI's strategy for growth includes both internal development of its
operations and strategic acquisitions. The goal of our acquisition strategy is
to accelerate market penetration, build upon our core competencies and expand
our technical staff and sales force. USI targets acquisition candidates based on
 
                                       30
<PAGE>
their fit in USI's overall business plan with a particular focus on the
development of expert product teams around specific business processes. Once a
candidate is acquired, USI integrates its IMAP products with the existing
service offerings of the acquired company and leverages the acquired sales force
and customer base to expand market opportunities. In this way, USI accelerates
its market penetration and gains established customer relationships,
complementary skill sets and operational core competencies.
 
    To implement its acquisition strategy, USI has sought acquisition candidates
with experienced technical professionals supported by project managers, training
personnel and a direct sales force. The ideal candidate is a small to mid-sized,
high-growth company with a focus toward service revenues, a business
relationship with one or more of our packaged application software providers and
a management team that shares our vision.
 
RECENTLY ACQUIRED COMPANIES
 
   
    To date, USI has acquired two companies. IIT, which was acquired in
September 1998, and ACR, which was acquired in October 1998. Described in more
detail below, these two companies have provided USI with an existing PeopleSoft
business partner relationship and Oracle and Sybase database integration and
implementation. The companies add expert product teams in ERP and add core
competencies in network integration, systems integration and Internet services.
The acquired companies also provide a marketing, sales, training and operational
presence in the Florida, California, Chicago and New York/New Jersey regions.
    
 
    The table below sets forth information regarding the acquired companies as
of December 31, 1998.
 
<TABLE>
<CAPTION>
                  TECHNICAL                                                                      1998
                  AND SALES       PRIMARY          EXPERT           CORE         NUMBER OF      REVENUE
COMPANY           PERSONNEL      LOCATIONS       PRACTICES      COMPETENCIES     CUSTOMERS    ($ MILLION)
- --------------  -------------  --------------  --------------  --------------  -------------  -----------
<S>             <C>            <C>             <C>             <C>             <C>            <C>
IIT                      35    Miami           PeopleSoft      Application              15     $  6.9
                               Chicago                         Integration,
                               Los Angeles                     Systems
                                                               Integration
 
ACR                      45    New York        Oracle          Systems                  25     $  7.5
                                               Sybase          Integration,
                                                               Software
                                                               Development
</TABLE>
 
   
    INTERNATIONAL INFORMATION TECHNOLOGY, INC.  IIT is a comprehensive provider
of PeopleSoft human resources management and system implementation. The
company's consulting professionals possess expertise in human resources
management as well as accounting and financial systems. IIT specializes in
software development, systems analysis and design, and systems integration
solutions. IIT is a PeopleSoft Global Implementation Partner. IIT's clients
represent a wide variety of industries, including manufacturing, utility,
banking, government, food and services. IIT provides USI with a regional expert
practice focused on PeopleSoft applications and a team of approximately 35
technical consultants dispersed across the United States. IIT was purchased for
$12.8 million and warrants to purchase 400,000 shares of Common Stock at an
exercise price of $2.00 per share. In addition, if IIT meets certain 1998
revenue, EBITDA and employee retention goals, the total cash purchase price can
be increased by up to $3.8 million.
    
 
   
    ADVANCED COMMUNICATION RESOURCES, INC.  ACR, a New York based systems
integration services company, specializes in Oracle and Sybase database
application integration and business consulting services focused on the
financial services industry. ACR is a Sybase Training Partner and a Microsoft
Authorized Training Center. ACR provides USI with a market presence in the New
York/New Jersey
    
 
                                       31
<PAGE>
   
region, as well as approximately 40 technical consultants and 4 sales
representatives. ACR was acquired for $2.5 million in cash, a $3.5 million note
(repaid on January 6, 1999) and warrants to purchase 500,000 shares of Common
Stock at an exercise price of $2.00 per share. In addition if ACR meets certain
revenue, EBITDA and employee retention goals, the total cash purchase price can
be increased by up to $5 million.
    
 
   
    IIT and ACR are the primary providers of the traditional IT services we
sell. In addition, our other implementation teams occasionally sell these
services on a time and materials basis. Both IIT and ACR are being successfully
integrated into USI, with minimal loss of staff. Sales, accounting, and
administrative functions have been combined. Both companies are also now
supporting the implementation of specific IMAP offerings.
    
 
CLIENTS
 
    USI targets North American-based middle market enterprises and selected
divisions of larger multinational organizations. We believe that these
organizations will gain the most competitive advantage from IMAP solutions and
that they provide the greatest opportunity for the outsourcing of IT operations.
Currently, business software application vendors are providing software
predominantly to larger organizations. Historically, attempts to market to
middle market enterprises have generally been unsuccessful due to the high
up-front costs to obtain the required software, the long lead time to integrate
the software into the specific business process, and the competition for and
shortage of IT resources in middle market companies.
 
    USI currently has clients for both its IMAP offerings and the traditional IT
services sold by IIT and ACR. As of December 31, 1998, USI had seven IMAP
clients representing a backlog (revenues under contract but not yet earned) in
excess of $2.0 million (of which approximately $1.0 million will be earned in
the next twelve months). USI and its acquired entities are currently serving in
excess of 35 customers with traditional IT services, many of whom are candidates
for cross-selling IMAP offerings. As of December 31, 1998, selected clients of
USI included:
 
   
<TABLE>
<CAPTION>
            IMAP CLIENTS                  TRADITIONAL IT SERVICES CLIENTS
- -------------------------------------  -------------------------------------
<S>                                    <C>
 
        Sunburst Hospitality                     Kaiser Permanente
        GE Capital Retirement                          Nike
            Abaccy Group                    Southern California Edison
             Legg Mason                           Lockheed Martin
               Sagent                              Deutsche Bank
          Lattice Partners                     Prudential Insurance
</TABLE>
    
 
CLIENT CARE
 
    A central element of the IMAP solution is a high level of responsive
personalized service, referred to as "Client Care." Through the USI Client Care
process, a specific technical account manager is assigned to each client and
support teams are designated to back up the account managers. This structure is
designed to ensure full 24x7 availability of service. Assigned support teams
comprise senior client support specialists, network engineers, and packaged
application engineers. The teams have further support from a group of product
specific application engineers who are trained in specific software applications
offered by USI.
 
COMPETITION
 
    The market for Internet-related services is extremely competitive. We
anticipate that competition will continue to intensify as the use of the
Internet grows. The tremendous growth and potential market size of the Internet
market have attracted many start-ups as well as extensions of existing
businesses from
 
                                       32
<PAGE>
different industries. In the market for Internet-enabled application software
and network solutions, we compete on the basis of performance, price, software
functionality and overall network design. While USI's competition comes from
many industry segments, we believe no single segment provides the integrated,
single-source solution provided by USI. Current and prospective competitors
include systems integrators; national, regional and local ISPs; hardware and
software suppliers; and telecommunications companies.
 
    SYSTEMS INTEGRATORS.  We compete with national, regional, and local
commercial systems integrators. Certain of these companies bundle their services
with software and hardware providers and perform a facilities management
outsourcing role for the customer. Also, certain competitors have greater name
recognition or more extensive experience than we do. EDS, Andersen Consulting,
PricewaterhouseCoopers and MCI Systemhouse, among others, provide professional
consulting services in the use and integration of software applications in
single-project client engagements. Large systems integrators may establish
strategic relationships with software vendors to offer services similar to our
IMAP offerings. We expect that regional systems integrators are likely to
compete with us based on local customer awareness and relationships with
hardware and software companies. Additionally, regional systems integrators may
align themselves with ISPs to offer complex Web Site management combined with
professional implementation services.
 
    ISPS.  Our current primary competitors include business-focused ISPs with a
significant national presence, such as UUNet Technologies, Inc., GTE
Internetworking Incorporated, PSINet, Inc., Concentric Network Corporation,
DIGEX, Frontier Corporation and Exodus Communications, Inc., among others. While
we believe that our level of service, support and targeted business focus
distinguish us from these competitors, some of these competitors have
significantly greater market presence, brand recognition, and financial,
technical and personnel resources than we do, and have extensive coast-to-coast
Internet networks.
 
    HARDWARE AND SOFTWARE COMPANIES.  We compete with hardware and software
companies in providing packaged application solutions as well as network
infrastructure. In order to build market share, both hardware and software
providers may establish strategic relationships in order to enhance their
service offerings. IBM Solutions currently provides applications outsourcing
around its Lotus Notes products and delivers the service via the IBM network
infrastructure. J.D. Edwards & Company, a developer of ERP software, has
announced that it will offer its software in an outsourced model. SAP
Aktiengesellschaft has formed an outsourcing organization to develop key
partnerships with leading consulting firms with the intent of offering SAP
software. We believe that additional hardware and software providers, including
certain of our strategic partners, may enter the outsourcing market in the
future.
 
    TELECOMMUNICATIONS COMPANIES.  All of the major long distance companies,
including AT&T, MCI WorldCom, and Sprint, offer Internet access services. In
order to address the Internet connectivity requirements of the current business
customers of long distance and local carriers, we believe that there is a move
toward horizontal integration through acquisitions of, joint ventures with, and
purchasing connectivity from, ISPs. Accordingly, USI expects that it will
experience increased competition from the traditional telecommunications
carriers. Many of these telecommunications carriers, in addition to their
substantially greater network coverage, market presence, and financial,
technical and personnel resources, also have large existing commercial customer
bases. We believe that our local presence, our strong technical and
data-oriented sales force and our offering of branded software applications are
important features distinguishing us from the telecommunications companies.
 
    OTHER POTENTIAL COMPETITORS.  It is possible that new competitors or
alliances may emerge and gain market share. Such competitors could materially
affect our ability to obtain new contracts. Further, competitive pressure could
require us to reduce the price of our products and services thus affecting our
business, financial condition and results from operations.
 
                                       33
<PAGE>
PROPERTIES
 
    USI is headquartered in Annapolis, Maryland, where it currently leases its
principal executive office. USI's training and conference facilities are located
in a building it owns in Annapolis, Maryland.
 
    We lease offices and space in a number of locations, primarily for EDC and
GEMC installations. We believe that our leased facilities are adequate to meet
our current needs in the markets in which we have begun to deploy our services,
and that additional facilities are available to meet our expansion needs in our
target markets for the foreseeable future.
 
EMPLOYEES
 
    As of December 31, 1998, we employed approximately 348 people, including
full-time and part-time employees at our corporate headquarters, our GEMCs and
EDCs and at our subsidiaries. We consider our employee relations to be good.
None of our employees are covered by a collective bargaining agreement.
 
LEGAL PROCEEDINGS
 
    From time to time we may be involved in litigation that arises in the normal
course of business operations. As of the date of this Prospectus, we are not a
party to any litigation that we believe could reasonably be expected to have a
material adverse effect on our business or results of operations.
 
                                       34
<PAGE>
                                   MANAGEMENT
 
    The following sets forth certain information regarding our current directors
and executive officers.
 
<TABLE>
<CAPTION>
NAME                                                       AGE                            POSITION
- -----------------------------------------------------      ---      -----------------------------------------------------
<S>                                                    <C>          <C>
Christopher R. McCleary(1)...........................          45   Chief Executive Officer and Chairman of the Board
Stephen E. McManus...................................          49   President and Director
Jeffery L. McKnight..................................          55   Executive Vice President of Operations and Client
                                                                    Services
Andrew A. Stern......................................          41   Executive Vice President and Chief Financial Officer
Vincent L. Romano....................................          52   Senior Vice President World Wide Sales
Matthew D. Kanter....................................          36   Vice President and General Manager--Data Warehouse
                                                                    Implementation and President of ACR
L. Sebastian Alegrett................................          34   Vice President and General Manager-- PeopleSoft
                                                                    Implementation Group and President of IIT
R. Dean Meiszer(3)...................................          42   Director
Benjamin Diesbach(2).................................          52   Director
David J. Poulin(3)...................................          39   Director
Ray A. Rothrock(1)(3)................................          43   Director
Frank A. Adams(1)(2).................................          52   Director
William F. Earthman(1)(2)............................          47   Director
John H. Wyant(1).....................................          52   Director
Joseph R. Zell.......................................          38   Director
Michael C. Brooks (1)(2)(3)..........................          53   Director
</TABLE>
 
- ------------------------
 
(1) Member of the Executive Committee
 
(2) Member of the Compensation Committee
 
(3) Member of the Audit Committee
 
   
    CHRISTOPHER R. MCCLEARY is a co-founder of USI and has served as the
Chairman and Chief Executive Officer of USI since January 1998. Prior to
founding USI, he was the Chairman and Chief Executive Officer of DIGEX, Inc.
from January 1996 to December 1997. Prior to serving at DIGEX, Mr. McCleary
served as Vice President and General Manager of a unit of American Mobile
Satellite Corporation, a satellite communications company, from January 1991 to
December 1994.
    
 
    STEPHEN E. MCMANUS is a co-founder of USI and has served as its President
and a Director since April 1998. Prior to joining USI, Mr. McManus was Director
of U.S. Sales for the telecommunications unit of Data General Corporation from
January 1998 to March 1998. From June 1995 to December 1998 Mr. McManus served
as a Branch Manager for Silicon Graphics. Prior to joining Silicon Graphics, Mr.
McManus held several positions at Data General Corporation from June 1988 to May
1995, including District Manager for Distributor Sales, VAR District Manager and
Branch Manager.
 
   
    JEFFERY L. MCKNIGHT has been Executive Vice President of Operations and
Client Services since December 1998. He originally joined USI in June of 1998 as
Senior Vice President of Client Care. Previously, he held senior marketing and
operations positions with Aeronautical Radio, Inc. (ARINC) the communications
arm of all of the domestic airlines, for 10 years. Prior to ARINC, he held
senior operations positions with Systems One, Inc.
    
 
                                       35
<PAGE>
    ANDREW A. STERN has been Executive Vice President and Chief Financial
Officer of USI since July 24, 1998. Prior to joining USI, Mr. Stern held
positions at USF&G Corporation, an insurance company, from May 1993 to July
1998, most recently as Executive Vice President, Strategic Planning and
Reinsurance Operations. In addition, Mr. Stern was a partner of Booz Allen &
Hamilton, an international management and technology consulting firm with whom
he was employed from August 1981 to May 1993.
 
    VINCENT L. ROMANO, JR. has served as USI's Senior Vice President, Worldwide
Sales since he joined USI in July 1998. Prior to joining USI, Mr. Romano served
in various positions at Motorola, Inc. from March 1989 to July 1998, including
Vice President and Director of Worldwide Sales Operations for its computer
group. Prior to Motorola, he held senior sales positions with Data General, Inc.
 
    MATTHEW D. KANTER has served as the Company's Vice President and General
Manager, Data Warehouse Implementations since October 1998. He joined USI after
USI's aquisition of ACR, where he was President, CEO, and Technical Director
from January 1993 to October 1998. ACR delivers applications development and
systems integration services to the financial services community in the
Northeastern United States. Before joining ACR, Mr. Kanter was Director of
Technical Services at Simpson, Thacher and Bartlett.
 
   
    L. SEBASTIAN ALEGRETT has served as USI's Vice President and General
Manager, PeopleSoft Implementation Group, since September 1998. From February
1994 to September 1998 he was the President and CEO of IIT, a PeopleSoft Global
Alliance Partner founded by Mr. Alegrett. USI acquired IIT in September 1998.
    
 
    R. DEAN MEISZER has been a director of USI since it was founded. He has been
President and Managing Director of The Crisler Company, a Cincinnati-based
investment firm, since May 1989. Prior to Crisler, Mr. Meiszer was Senior Vice
President of Society Bank.
 
    BENJAMIN DIESBACH was elected as a director of USI in May 1998 as a designee
of Mr. McCleary in his role as Chief Executive Officer of USI. He has been
President of Midwest Research, Inc., a consulting firm, since he formed it in
January 1995. Prior to forming Midwest Research, Mr. Diesbach was Chief
Executive Officer of Continental Broadcasting, Ltd., a broadcasting company,
from September 1993 to January 1995.
 
    DAVID J. POULIN was elected as a director of USI in May 1998 as a designee
of Mr. McCleary in his role as Chief Executive Officer. He has been the head
hockey coach at the University of Notre Dame since May 1995. Prior to joining
Notre Dame as hockey coach, Mr. Poulin played in the National Hockey League for
13 years.
 
    RAY A. ROTHROCK was elected as a director of USI in June 1998 as a designee
of the Venrock Group. He has been a General Partner of Venrock Associates, the
venture capital investment firm of the Rockefeller Family, since June 1988.
Prior to joining Venrock, Mr. Rothrock was President and Director of the New
York Venture Capital Forum. Mr. Rothrock has served on the Boards of Directors
of numerous technology companies, including DIGEX, CheckPoint Software
Technology, Spyglass, Inc., Appliant Inc. and Simba Technology.
 
   
    FRANK A. ADAMS was elected as a director of USI in June 1998 as a designee
of the Grotech Group. He is the President and Chief Executive Officer of Grotech
Capital Group, which he co-founded in August 1984. Mr. Adams has served as
President of the Mid-Atlantic Venture Association since July 1985. He has served
on the Board of Directors of a number of technology companies including
Thunderbird Technologies, Inc. and EPIC Therapeutics, Inc.
    
 
    WILLIAM F. EARTHMAN was elected as a director of USI in June 1998 as a
designee of the Massey Burch Group. He has been a Partner of Massey Burch
Capital Corporation since January 1994. Prior to becoming a partner at Massey
Burch Capital Corporation, Mr. Earthman served from January 1990 as a Vice
President of Massey Burch Investment Group. Prior to Massey Burch, he worked for
the investment banks J.C. Bradford & Co. from September 1975 to October 1981,
Prudential-Bache Securities from October
 
                                       36
<PAGE>
1981 to November 1985 and First Nashville Corp. from December 1985 to December
1989. He currently serves on the board of Intellivoice Communications, Inc. and
Legal Technologies Network, Inc.
 
    JOHN H. WYANT was elected as a director of USI in June 1998 as a designee of
the Blue Chip Group. He is the Managing Partner and President of Blue Chip
Venture Company, which he founded in 1990. Mr. Wyant is currently a director of
Regent Communications, Inc., Zaring Homes, Inc. and Ciao Cucina Corporation. He
previously served as a director of DIGEX.
 
    JOSEPH R. ZELL was elected as a director of USI in July 1998 as a designee
of U S WEST. Since December 1991, he has held several positions with the
!NTERPRISE Networking division of U S WEST Communications, Inc. He has been
President of the division since March 1997.
 
    MICHAEL C. BROOKS was elected as a director of USI in December 1998 as a
designee of the Whitney Group. He has been a general partner of J. H. Whitney &
Co. since 1984. He is also a director of SunGard Data Systems, Inc., Pegasus
Communications, Inc., Nitinol Medical Technology, Inc. and various other private
companies.
 
OTHER KEY EMPLOYEES
 
    In addition, we employ the following other key employees:
 
   
    L. GARRETT BROWN has been Vice President of Product Development for USI
since joining USI in July 1998. Mr. Brown most recently served as Product
Manager of Collocation Services and Managed Hosting for UUNet Technologies
overseeing product introduction. Prior to that he managed the Major
Opportunities, Server Hosting Division of UUNet Technologies.
    
 
    LAWRENCE BRUNELLE has served as USI's Vice President of Consulting and
Implementation Services since he joined USI in June 1998. Prior to joining USI,
Mr. Brunelle worked as a Managing Associate with Coopers & Lybrand Consulting
from August 1997 to June 1998. Prior to working at Coopers & Lybrand Consulting,
he was a senior technical manager with Andersen Consulting from June 1996 to
August 1997. In addition, from June 1990 to June 1996, Mr. Brunelle served in
various project management and technical consulting positions with Booz Allen &
Hamilton, Inc.
 
    MICHAEL HARPER has been Vice President of Product Marketing of USI since
joining USI in April 1998. Mr. Harper joins USI with over 13 years experience in
systems management, marketing and sales. He recently served as the Mid-Atlantic
Region Systems Manager for Silicon Graphics, Inc. with responsibility for
pre-sales and professional services to federal and commercial customers.
 
   
    RICHARD A. HRONICEK has been Vice President and General Manager, North
America West, for USI since joining USI in June 1998. Previously, he was a
consultant providing telecommunications expertise in mergers and acquisitions,
business strategy, and the acquisition and sale of Internet service providers.
Before that he served as the President and CEO of Javelin Internet Group. Mr.
Hronicek was also President, CEO, and founder of Pacific Bell Internet Services.
    
 
    WILLIAM G. KARPOVICH has been Vice President of Product Development, Complex
Web Hosting since he joined USI in May 1998. Prior to joining USI, he was
Director of Internet Products, a division of the NDC Group, Inc. Prior to that,
Mr. Karpovich was Director of Product Management at DIGEX.
 
    JOHN W. LICCIONE has served as Vice President, Research and Development for
USI since joining USI in April 1998. Prior to joining USI, he was Director of
System Development in the Network Services Division of ARINC, Inc.
 
   
    MARK J. MCENEANEY has been Vice President and Controller of USI since
joining USI in April 1998. Prior to joining USI, he was Chief Financial Officer
of Questar Builders, Inc., and of William Ryan Homes, Inc. Mr. McEneaney is a
CPA and was with Ernst & Young LLP as a Senior Manager in the accounting and
auditing division prior to joining William Ryan Homes.
    
 
                                       37
<PAGE>
    MICHELE PERRY has been Vice President, Marketing for USI since joining USI
in July 1998. Previously, she was Senior Vice President of Marketing and Vice
President of Product Management for Versatility, Inc. Ms. Perry was also General
Manager of Software AG's Federal Systems Region and then General Manager of the
Capital Region.
 
    CHRISTOPHER M. POELMA is a co-founder of USI and has served as a Senior Vice
President and General Manager since November 1998. He originally joined USI in
April 1998 as its Executive Vice President, Chief Technology Officer. Prior to
joining USI, Mr. Poelma was Vice President of the Enterprise Solutions division
of MICROS Systems, Inc., a technology company, from October 1997 to March 1998.
From January 1996 to October 1997 Mr. Poelma served as an Engagement Manager for
telecommunications and healthcare at Sun Microsystems, Inc. From January 1994 to
December 1995, Mr. Poelma served as Director of the Enterprise Solutions Group
at Unisys, Inc. Prior to his position at Unisys, Inc., Mr. Poelma held various
positions at Electronic Data Systems, Inc. from January 1987 to January 1994
including Systems Engineering Supervisor and Systems Engineering Manager.
 
    WILLIAM T. PRICE has been Vice President, Secretary and General Counsel of
USI since joining USI in April 1998. Prior to joining USI, Mr. Price was the
senior trial associate in the Baltimore-based law firm of Albright, Brown &
Goertemiller, where he represented major corporate clients in antitrust,
copyright, intellectual property and other commercial matters in various state
and federal courts.
 
    JAY W. ROBERTSON is our Vice President of Operations. He joined USI in May
1998 as Vice President Support Services. Prior to joining USI, Mr. Robertson was
the Senior Director of Network Services for the ARINC Corporation Radio
Division. Prior to ARINC, Mr. Robertson was with Sprint Corporation for 13
years.
 
    JOHN TOMLJANOVIC has been Vice President, Client Care since November 1998.
He joined the company in June 1998 as its Director of Application Engineering.
Prior to joining USI, Mr. Tomljanovic was with Andersen Consulting from June
1992 to May 1998, most recently as a Manager in the telecommunications group.
 
    JOHN P. STREETEN has been Vice President, Finance of USI since November
1998. He originally joined USI in July 1998 as Vice President, Mergers and
Acquisitions. Prior to joining USI, Mr. Streeten was with IBM as a Finance
Manager of Acquisitions and Alliances. Prior to that, Mr. Streeten was District
Sales Manager of Lotus Development Corporation, an IBM subsidiary. Mr. Streeten
was also Regional Sales Manager at CalComp, Inc., a $520 million manufacturer of
computer graphics hardware and peripherals.
 
    BRENDA WOODSMALL has been Vice President Human Resources for USI since
joining USI in May 1998. Prior to joining USI, Ms. Woodsmall was an independent
consultant based in the Annapolis and Washington, D.C. areas performing
recruiting, customer service training programs, and other human resources work
with startup companies. Her last corporate role was Senior Vice President of
Human Resources at System One Corporation.
 
COMMITTEES OF THE BOARD OF DIRECTORS
 
    In June 1998, the Board of Directors established a Compensation Committee,
an Audit Committee and an Executive Committee. The Compensation Committee makes
recommendations concerning salaries and incentive compensation of our employees
and consultants and administers the Option Plan (as defined). The Audit
Committee reviews, acts on and reports to the Board of Directors with respect to
various auditing and accounting matters, including reviewing our audit policies,
overseeing the engagement of our independent auditors and developing our
financial strategies. The Executive Committee is empowered to conduct all
activities that may be conducted by the Board of Directors, subject only to
limitations imposed by applicable Delaware corporate laws.
 
                                       38
<PAGE>
COMPENSATION OF DIRECTORS
 
    All non-employee directors are reimbursed for travel and other related
expenses incurred in attending meetings of the Board of Directors. In addition,
each non-employee director then serving on the Board of Directors will receive
upon the date of the first Board meeting in the second calendar quarter of each
year an option granted pursuant to the Option Plan to purchase 30,000 shares of
our Common Stock. The options will vest immediately and will have an exercise
price equal to the fair market value of the Common Stock on the date of grant.
The shares of Common Stock purchased pursuant to these options will be subject
to repurchase by us as described in "--Stock Option Plan".
 
EMPLOYMENT AGREEMENTS
 
    We have entered into employment agreements with Christopher R. McCleary,
Stephen E. McManus, Jeffery L. McKnight and Andrew A. Stern, each with a term of
three years subject to early termination.
 
    Mr. McManus' agreement, entered into on June 2, 1998, Mr. Stern's agreement,
entered into on July 27, 1998, Mr. McCleary's agreement, entered into on May 29,
1998, and Mr. McKnight's agreement, entered into on December 15, 1998, provide
that we will employ them as President; Executive Vice President and Chief
Financial Officer; Chairman and Chief Executive Officer; and Executive Vice
President of Operations and Client Services, respectively, at an annual salary
of $175,000 each. Mr. McManus, Mr. McKnight and Mr. Stern are also eligible for
an annual bonus of at least $75,000 subject to increase based on the
accomplishments of USI as determined by the Compensation Committee of the Board
of Directors. Mr. McCleary's bonus is determined each year based upon whether he
meets or exceeds certain management objectives. There is no minimum bonus for
the first year of Mr. McCleary's contract. In the second and third years of his
contract if he is awarded a bonus, it must be at least $250,000 and $500,000,
respectively. The salaries and bonuses will be reviewed annually and are subject
to adjustment by the Compensation Committee.
 
    In addition to the salary and bonus, we granted Mr. McManus and Mr. Stern
the opportunity to purchase, and each purchased, 5,000,000 shares of USI Common
Stock (the "Stock Grant"). As described in detail below, we have the right to
buy back the stock purchased pursuant to the Stock Grant upon the occurrence of
certain events. This right will expire if it is not exercised prior to a Change
of Control (as defined in the employment agreements). We have also agreed to
provide Mr. McManus and Mr. Stern each with a life insurance policy with a face
amount of twice the officer's annual salary, less the amount of any group
insurance selected by the officer as part of our standard group insurance plan.
In addition to salary and bonus, we granted to Mr. McKnight a fully exerciseable
option to purchase all or any part of 3,000,000 shares of our fully paid and
non-assessable Common Stock ("Option Grant"), subject to the terms and
conditions of our Option Plan.
 
   
    We may terminate Mr. McManus', Mr. McKnight's or Mr. Stern's employment for
"cause." Cause is defined as (1) violating any provision of his employment
agreement, (2) engaging in any illegal or immoral practices or activities which
can reasonably be expected to be materially detrimental to our reputation, (3)
manifesting dishonesty, disloyalty, fraud, willful misconduct or material
dereliction in the discharge of duties, or (4) using, possessing, selling,
trading in, or delivering any illegal drug or controlled substance during
working hours or otherwise. If the event giving rise to the termination for
cause is not remedied during the 60-day cure period as provided for in the
agreement and the termination is deemed to be valid by an arbitrator, we shall
not be liable for salary, bonus or benefits payable after the date of
termination and shall have the option of buying back all the shares purchased by
the employee pursuant to the Stock Grant for $100 (or, in the case of Mr. Stern,
for an amount equal to the total federal, state, and local income tax liability
incurred as a result of the Stock Grant; or in the case of Mr. McKnight, he may
not exercise any part of his Option Grant from the date of termination). We may
repurchase at the exercise price of $0.33 per share the number of shares still
subject to forfeiture in the event of Mr. McKnight's termination. If Mr.
McManus' or Mr. Stern's employment is terminated due to disability or death, USI
will
    
 
                                       39
<PAGE>
   
repurchase the shares of Common Stock he purchased pursuant to the Stock Grant
at the fair market value of the shares. If Mr. McKnight's employment is
terminated due to disability or death, he or his estate shall have, pursuant to
the terms of the Option Plan, one year to exercise all or any part of the Option
Grant. Should any of Mr. McManus, Mr. McKnight or Mr. Stern elect to terminate
the agreement, we will not be liable for his salary, bonus or benefits payable
after the date of termination of his employment and will have the option of
buying back the stock purchased by the employee pursuant to the Stock Grant for
$100 (or, in the case of Mr. Stern, for an amount equal to the total federal,
state, and local income tax liability incurred as a result of the Stock Grant)
if the termination is before May 30, 2000, or fair market value as determined by
the Compensation Committee if the termination is after May 30, 2000. Should Mr.
McKnight elect to terminate his agreement, we will not be liable for his salary,
bonus or benefits payable after the date of termination of his employment and we
may repurchase at the exercise price of $0.33 per share the number of options
still subject to forfeiture at the time of his termination under the Option
Plan. If either Mr. McManus or Mr. Stern is terminated without cause, or if Mr.
Stern is constructively terminated without cause, we may not repurchase the
stock purchased pursuant to his Stock Grant and we will be liable to pay his
salary for the remainder of the term of the employment agreement (and, in the
case of Mr. Stern, for a minimum of one year) and a bonus prorated for the
remaining term of the agreement. If Mr. McKnight is terminated without cause,
our right, if any, to repurchase his shares under the Option Plan shall lapse 24
hours prior to his termination.
    
 
    We may terminate Mr. McCleary for cause upon a two-thirds vote of the Board
of the Directors, and will not have liability for payment of any salary, bonus
or benefits after the date of termination. Any such vote must be preceded by a
finding by a majority of the members of the Compensation Committee or Executive
Committee that Mr. McCleary has breached his employment agreement. The agreement
also will terminate upon Mr. McCleary's death or disability. Mr. McCleary is
entitled to his salary for the full term of the agreement if he is terminated
without cause or if he terminates his employment for "good reason" which is
defined as (i) USI's material breach of any provision of the agreement, (ii) any
material adverse change in job responsibilities, duties, functions, or reporting
relationships, or (iii) required relocation of Mr. McCleary's regular work
address that requires more than 50 miles of travel. If Mr. McCleary terminates
his employment other than for good reason, we will not be liable for his salary
or benefits; however, he shall be entitled to his bonus if it was awarded or if
its amount had been determined by the Compensation Committee prior to the
termination date.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    Prior to June 1998, we had no separate compensation or stock option
committee or other board committee performing equivalent functions, and these
functions were performed by our Board of Directors. Both Mr. McCleary and Mr.
McManus were members of the Board of Directors during that period. In June 1998,
we established Compensation, Audit and Executive committees of our Board of
Directors. The Compensation Committee is composed of non-employee directors. See
"--Committees of the Board of Directors."
 
                                       40
<PAGE>
EXECUTIVE COMPENSATION
 
    SUMMARY COMPENSATION.  The following table provides certain summary
information concerning compensation paid or accrued by the Company to or on
behalf of our Chief Executive Officer and each of the other executive officers
of the Company who earned more than $100,000 (salary and bonus) for all services
rendered in all capacities during the fiscal year ended December 31, 1998 (the
"Named Executive Officers"):
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                          LONG TERM COMPENSATION
                                                                         ANNUAL                   AWARDS
                                                                     COMPENSATION(1)     ------------------------
                                                                  ---------------------     SHARES UNDERLYING
NAME AND PRINCIPAL POSITION                                         SALARY      BONUS            OPTIONS
- ----------------------------------------------------------------  ----------  ---------  ------------------------
<S>                                                               <C>         <C>        <C>
Christopher R. McCleary
  Chairman of the Board, Chief Executive Officer................  $  131,250  $       0             --
Stephen E. McManus
  President.....................................................  $  131,250  $       0             --
Jeffery L. McKnight,
  Executive Vice President of Operations and Client Services....  $   75,962  $  50,000           3,000,000
</TABLE>
 
- ------------------------
 
(1) With respect to each of the Named Executive Officers, the aggregate amount
    of perquisites and other personal benefits, securities or property received
    was less than either $50,000 or 10% of the total annual salary and bonus
    reported for such Named Executive Officer.
 
    STOCK OPTIONS.  The following table contains information concerning the
stock option grants made to each of the Named Executive Officers during the
fiscal year ended December 31, 1998:
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                                POTENTIAL REALIZABLE
                                                                                                  VALUE AT ASSUMED
                                                 INDIVIDUAL GRANTS                                  ANNUAL RATES
                        --------------------------------------------------------------------       OF STOCK PRICE
                        NUMBER OF SHARES OF      % OF TOTAL                                         APPRECIATION
                           COMMON STOCK        OPTIONS GRANTED      EXERCISE                     FOR OPTION TERM(2)
                        UNDERLYING OPTIONS     TO EMPLOYEES IN        PRICE      EXPIRATION   ------------------------
NAME                        GRANTED (1)             1998            PER SHARE       DATE          5%          10%
- ----------------------  -------------------  -------------------  -------------  -----------  ----------  ------------
<S>                     <C>                  <C>                  <C>            <C>          <C>         <C>
Christopher R.
  McCleary............                0              --                --            --           --           --
Stephen E. McManus....                0              --                --            --           --           --
Jeffery L. McKnight...        3,000,000                22.3%        $    0.33       12/2008   $  622,606  $  1,577,805
</TABLE>
 
- ------------------------
 
(1) The options are immediately exercisable and expire on the tenth anniversary
    of the date of grant. Shares of Common Stock purchased pursuant to these
    options will be subject to our right to repurchase them at the option
    exercise price upon the termination of the holder's employment or business
    relationship with us. The repurchase right will lapse with respect to
    one-third of the shares purchasable upon exercise of an option on the first
    anniversary of the date of grant of the option. The repurchase right with
    respect to the remainder of the shares purchasable upon exercise of an
    option will lapse in equal quarterly installments over the subsequent eight
    calendar quarters.
 
(2) The 5% and 10% assumed annual rates of compounded stock price appreciation
    are mandated by the rules of the SEC. There can be no assurance that the
    actual stock price appreciation over the ten-year
 
                                       41
<PAGE>
    option term will be at the assumed 5% and 10% levels or at any other defined
    level. Unless the market price of the Common Stock appreciates over the
    option term, no value will be realized from the option grants made to the
    Named Executive Officers. The potential realizable value is calculated by
    assuming that the fair market value of the Common Stock on the date of grant
    of the options appreciates at the indicated rate for the entire term of the
    option and that the option is exercised at the exercise price and sold on
    the last day at the appreciated price. Assumes appreciation at the
    independently appraised value of the Common Stock of 5% and 10% per year
    over the ten-year option period as mandated by the rules and regulations of
    the Securities and Exchange Commission, and does not represent our estimate
    or projection of the future value of the Common Stock.
 
    YEAR-END OPTION VALUES.  The following table sets forth information
concerning option holdings through December 31, 1998 by each of the Named
Executive Officers:
 
                         FISCAL YEAR-END OPTION VALUES
 
   
<TABLE>
<CAPTION>
                                                               NUMBER OF SHARES OF       VALUE OF UNEXERCISED
                                                             COMMON STOCK UNDERLYING         IN-THE-MONEY
                                                             OPTIONS AT YEAR END(1)     OPTIONS AT YEAR END(2)
                                                            -------------------------  -------------------------
NAME                                                        EXERCISABLE UNEXERCISABLE  EXERCISABLE UNEXERCISABLE
- ----------------------------------------------------------  ----------  -------------  ----------  -------------
<S>                                                         <C>         <C>            <C>         <C>
Christopher R. McCleary...................................      --           --            --           --
Stephen E. McManus........................................      --           --            --           --
Jeffery L. McKnight.......................................   3,000,000       --        $                --
</TABLE>
    
 
- ------------------------
 
(1) "Exercisable" refers to those options which will be vested and exercisable
    immediately upon completion of this offering, while "Unexercisable" refers
    to those options which will be unvested at such time.
 
(2) Value is determined by subtracting the exercise price from the fair market
    value of the Common Stock based on an assumed initial public offering price
    of $    , multiplied by the number of shares underlying the options.
 
STOCK OPTION PLAN
 
    Our 1998 Stock Option Plan (the Option Plan), approved by the Board of
Directors in July 1998, provides for the issuance of up to 13,458,000 shares of
Common Stock pursuant to the grant of stock options (both Nonqualified Stock
Options and Incentive Stock Options, as defined in the Option Plan) to
independent directors, employees and consultants, each as defined in the Option
Plan. As of December 31, 1998, 13,458,000 options had been awarded, each with an
exercise price of $0.33 per share. These options are intended to qualify as
Incentive Stock Options (ISO's) and will vest immediately upon the date of
grant. Shares of Common Stock purchased pursuant to these options will be
subject to our right to repurchase them at the option exercise price upon the
termination of the holder's employment or business relationship with us. The
repurchase right will lapse with respect to one-third of the shares purchasable
upon exercise of an option on the first anniversary of the date of grant of the
option. The repurchase right with respect to the remainder of the shares
purchasable upon exercise of an option will lapse in equal quarterly
installments over the subsequent eight calendar quarters.
 
    The Compensation Committee appointed to administer the Option Plan has
discretion to determine which employees and consultants will be granted stock
options, the number of shares to be optioned, and the terms and conditions of
such options. The full Board of Directors conducts the administration of the
Option Plan with respect to options granted to independent directors. During the
term of the Option Plan, each independent director serving on the date of the
first board meeting during the second calendar quarter of each year will
automatically be granted an option to purchase 30,000 shares of Common Stock on
such date. The exercise price of such shares will be the fair market value on
the date of grant (as determined under the terms of the Option Plan). Generally,
options granted to independent directors vest
 
                                       42
<PAGE>
in annual one-third installments. The Compensation Committee (or the Board, as
applicable) also has discretion to make adjustments to options in the event of a
change in control or other corporate event, including without limitation, the
discretion to accelerate the vesting of options or waive our repurchase right.
 
    The federal income tax consequences, in general, of the grant and exercise
of an ISO under the Option Plan are as follows. In general, an employee will not
recognize taxable income upon the grant or exercise of an ISO and we will not be
entitled to any business expense deduction with respect to the grant or exercise
of an ISO. If the employee holds the shares for at least two years after the
date of grant and for at least one year after the date of exercise, the
difference, if any, between the sales price of the shares and the exercise price
of the option will be treated as long-term capital gain or loss upon subsequent
disposition of the shares. If the employee disposes of the shares prior to
satisfying the holding period requirements, the employee will recognize ordinary
income at the time of the disposition, generally in an amount equal to the
excess of the fair market value of the shares at the time the option was
exercised over the exercise price of the option. The balance of the gain
realized, if any, will be short-term or long-term capital gain, depending upon
whether the shares have been held for at least twelve months after the date of
exercise. Generally, we will be allowed a business expense deduction to the
extent an employee recognizes ordinary income.
 
    The federal income tax consequences, in general, of the grant and exercise
of an Nonqualified Stock Option (a "NSO") under the Option Plan are as follows.
In general, a recipient who receives a NSO will recognize no income at the time
of the grant of the option. Upon exercise of an NSO, a recipient will recognize
ordinary income in an amount equal to the excess of the fair market value of the
shares on the date of exercise over the exercise price of the option. The basis
in shares acquired upon exercise of an NSO will equal the fair market value of
such shares at the time of exercise, and the holding period of the shares (for
capital gain purposes) will begin on the date of exercise. Generally, we will be
entitled to a business expense deduction in the amount and at the time the
recipient recognizes ordinary income.
 
                                       43
<PAGE>
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
   
PURCHASES OF SERIES A PREFERRED STOCK
    
 
   
    Pursuant to an agreement dated May 13, 1998, Blue Chip Capital Fund II
Limited Partnership; Miami Valley Venture Fund L.P.; Grotech Partners IV L.P.;
Grotech Partners V L.P.; Southern Venture Fund SBIC, L.P.; Southern Venture Fund
II, L.P.; Venrock Associates; and Venrock Associates II, L.P. (together, the
Initial Series A Purchasers) purchased, in the aggregate, 38,333.33 shares of
Series A Preferred Stock for an aggregate purchase price of $23 million.
    
 
   
    In connection with the issuance of the shares to the Initial Series A
Purchasers, we issued 1,666.67 shares of Series A Preferred Stock to Christopher
R. McCleary, in exchange for the cancellation of $1 million of debt that we owed
to Mr. McCleary.
    
 
   
    Pursuant to an agreement dated June 18, 1998, we issued an additional 5,000
shares of Series A Preferred Stock to certain of the Initial Series A Purchasers
for an aggregate purchase price of $3 million.
    
 
   
    Pursuant to an agreement dated June 18, 1998, we issued 5,833.33 shares of
Series A Preferred Stock to U S WEST for $3.5 million.
    
 
   
    Pursuant to agreements dated June 19, 1998, we issued 3,000 shares of Series
A Preferred Stock to HAGC Partners, Chris Horgan (who later transferred his
interest to his affiliate, Southeastern Technology Fund, L.P.) and a series of
purchasers represented by Account Management Corporation (the Account Management
Purchasers) for an aggregate purchase price of $1.6 million and 1,166.67 shares
of Series A Preferred Stock to USI Partners, Ltd. (USI Partners) for $700,002.
    
 
   
BRIDGE FINANCINGS AND PURCHASES OF SERIES B PREFERRED STOCK
    
 
   
    Pursuant to agreements dated September 8, 1998, all of the existing holders
of Series A Preferred Stock other than Southern Venture Fund SBIC, L.P., HAGC
Partners, Christopher McCleary and two of the Account Management Purchasers
purchased our convertible promissory notes in the aggregate amount of
$9,095,000, together with warrants to purchase 7,795,722 shares of Common Stock
for $.01 per share.
    
 
   
    On December 16, 1998, Blue Chip Capital Fund II, L.P. lent us $1 million,
which was repaid (with interest) in cash as of December 31, 1998.
    
 
   
    Pursuant to an agreement dated December 16, 1998, Grotech Partners V L.P.;
Southern Venture Fund II, L.P.; Venrock Associates; Venrock Associates II, L.P.;
USI Partners, Ltd.; and Siebel Systems, Inc. purchased our convertible
promissory notes in the aggregate amount of $8 million, all of which (other than
accrued interest, which was paid in cash) was converted into Series B Preferred
Stock on December 31, 1998, as described below.
    
 
   
    Pursuant to an agreement dated December 24, 1998, U S WEST purchased our
convertible promissory note in the amount of $5 million, all of which (other
than accrued interest, which was paid in cash) was converted into Series B
Preferred Stock on December 31, 1998, as described below.
    
 
   
    On December 31, 1998, the principal amount of the notes was converted into
Series B Preferred Stock as described below, the accrued interest was paid in
cash, and the warrants were exchanged for otherwise identical warrants having an
exercise price of $.43 per share.
    
 
   
    Pursuant to an agreement dated December 31, 1998, we issued 59,278.56 shares
of Series B Preferred Stock for an aggregate purchase price of $62,242,500 (a
portion of which was paid by conversion of the convertible promissory notes
identified above) to the holders of the convertible promissory notes described
above and J. H. Whitney III, L.P.; Whitney Strategic Partners III, L.P.;
Waller-Sutton Media Partners, L.P.; Arbor Venture Partners, L.L.C.; Southeastern
Technology Fund, L.P.; PNC Bank, N.A., Trustee; PNC Bank, N.A., Custodian; AEH
Profit Sharing Trust; Castellini Management Company; and all of the holders
    
 
                                       44
<PAGE>
   
of Series A Preferred Stock except Southern Venture Fund SBIC, L.P.; HAGC
Partners; and two of the Account Management Purchasers.
    
 
    The agreement pursuant to which we issued the Series B Preferred Stock
provides that if we become an "Affiliate" of U S WEST, as that term is defined
in Section 3(1) of the Communications Act of 1934, as amended, by virtue of U S
WEST's ownership interest in USI at such time as USI is providing certain
communications services in U S WEST's region that U S WEST is prohibited from
providing, then U S WEST will have the right to require us to purchase, and we
will have the right to cause U S WEST to sell to us, the minimum number of
shares of our capital stock that are required to be disposed of in order that we
not be deemed an Affiliate of U S WEST.
 
AMENDED AND RESTATED STOCKHOLDERS' AGREEMENT
 
    TERMINATION.  The provisions of the Amended and Restated Stockholders'
Agreement, other than those relating to registration rights and the right of the
Whitney Group to designate a director will terminate upon consummation of this
offering.
 
    REGISTRATION RIGHTS.  Pursuant to the terms of the Amended and Restated
Stockholders' Agreement, the holders of the Preferred Stock (together, the
Investors) have certain rights to register shares of our Capital Stock. At any
time 90 days after the effective date of the first registration statement that
we file under the Securities Act, holders of at least 33% of the Registrable
Securities (as defined in the Stockholders' Agreement) may require us to effect
registration under the Securities Act of their Registrable Securities, subject
to the Board of Directors' right to defer the registration for a period of up to
180 days. In addition, if we propose to register securities under the Securities
Act (other than registrations on Form S-4 or Form S-8), then any of the
Investors has a right (subject to quantity limitations determined by
underwriters if this offering involves an underwriting) to request that we
register such holder's Registrable Securities. We will bear all registration
expenses incurred in connection with registrations. We have agreed to indemnify
the Investors against certain liabilities in connection with any registration
effected pursuant to the foregoing.
 
    RESTRICTIONS ON TRANSFER.  Subject to certain exceptions, we have a right of
first refusal if any stockholder receives and accepts a bona fide offer to
purchase our Securities (as defined in the Stockholders' Agreement) then owned
by such shareholder. In addition, each party to the Stockholders' Agreement has
the right to participate on a pro rata basis in any sale of our securities by
any party to the Stockholders' Agreement. Subject to certain exceptions, upon
our proposed issuance of any Common Stock or any other equity securities, each
party to the Stockholders' Agreement has the preemptive right to purchase that
number of New Securities (as defined in the Shareholders' Agreement) proposed to
be issued to maintain the shareholder's relative proportional equity interest in
USI.
 
    GOVERNANCE PROVISIONS.  The Stockholders' Agreement requires that the Board
of Directors consist of eleven members, six of whom are to be designated by each
of the Blue Chip Group, the Grotech Group, the Venrock Group, the Massey Burch
Group, the Whitney Group and U S WEST; and five of whom (including three persons
who are not our employees and are not affiliated with any of the Blue Chip
Group, the Grotech Group, the Venrock Group, the Massey Burch Group, the Whitney
Group and U S WEST) are designated by Christopher R. McCleary as long as he is
the Chief Executive Officer of USI. The designation of the three independent
directors is subject to the reasonable consent of the holders of two-thirds of
each series of preferred stock. Siebel Systems, Inc. has the right to designate
a director if it so chooses, (in which case McCleary designates only four
directors) and Waller-Sutton Media Partners, L.P. has the right to designate an
observer to the Board of Directors. The Stockholders' Agreement also requires
that the Board of Directors have an Executive Committee that has the right to
exercise all powers of the Board of Directors to the maximum extent permitted by
the Delaware General Corporation Law and which all consist of at least the Chief
Executive Officer and a person designated by each of the Blue
 
                                       45
<PAGE>
Chip Group, the Grotech Group, the Venrock Group, the Massey Burch Group, the
Whitney Group and U S WEST; and an Audit Committee and a Compensation Committee,
each of which shall have one member named by the Whitney Group. A director may
be removed only by the person entitled to appoint such director.
 
IMAP AGREEMENT WITH U S WEST
 
   
    USI and U S WEST have signed an agreement in which USI grants to U S WEST a
limited, nontransferable, non-exclusive license to use the IMAP Solution
developed for U S WEST by USI for the sole purpose of supporting certain of U S
WEST's operations described in the agreement. The agreement expires in three
years unless terminated earlier in a manner consistent with the agreement or
unless extended by mutual written agreement. U S WEST will pay USI a total of
$4,121,250 in thirty-six monthly installments for use of the IMAP Solution. The
agreement contains standard warranty, limitation of liability and indemnity
provisions.
    
 
PROPERTY SALE BETWEEN CHRISTOPHER R. MCCLEARY AND USI
 
    On July 21, 1998 Christopher R. McCleary sold USI real property located in
Anne Arundel County, Maryland for a purchase price of $220,000. The property is
used by USI for housing, transferring executives, summer interns and corporate
guests.
 
LOAN FROM CHRISTOPHER R. MCCLEARY TO USI
 
    In April 1998, Christopher R. McCleary loaned USI $1.0 million pursuant to a
short-term non interest bearing loan. We repayed this loan by issuing 1,666.67
shares of Series A Preferred Stock to Mr. McCleary in May 1998.
 
                                       46
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
    The table below sets forth, as of January 15, 1999, information with respect
to the beneficial ownership of our Common Stock as adjusted to reflect the
consummation of this offering by (i) each person who we know to be the
beneficial owner of more than 5% of our outstanding Common Stock; (ii) each of
the directors and Named Executive Officers individually; and (iii) all directors
and executive officers as a group. Except as otherwise indicated, each of the
stockholders has sole voting and investment power with respect to the shares
beneficially owned. The address of each executive officer and director is c/o
USINTERNETWORKING, Inc. One USI Plaza, Annapolis, MD 21401-7478.
 
   
<TABLE>
<CAPTION>
                                                                                                  PERCENTAGE OF
                                                                                                 OWNERSHIP(1)(2)
                                                                       NUMBER OF SHARES     --------------------------
                        EXECUTIVE OFFICERS                               BENEFICIALLY        BEFORE THIS   AFTER THIS
                          AND DIRECTORS                                  OWNED(1)(2)          OFFERING      OFFERING
- ------------------------------------------------------------------  ----------------------  -------------  -----------
<S>                                                                 <C>                     <C>            <C>
Christopher R. McCleary...........................................         10,380,925              3.95%
Stephen E. McManus................................................          5,000,000              1.90
Andrew A. Stern...................................................          5,000,000              1.90
Jeffery L. McKnight(3)............................................          3,000,000              1.13
 
DIRECTOR
R. Dean Meiszer(4)................................................          3,767,850              1.43
Ray A. Rothrock(5)................................................         21,393,761              8.14
Frank A. Adams(6).................................................         66,791,597             25.40
William F. Earthman(7)............................................         11,301,396              4.30
John H. Wyant(8)..................................................         30,506,136             11.60
Benjamin Diesbach(9)..............................................             30,000                 *
David J. Poulin(10)...............................................             30,000                 *
Michael C. Brooks(11).............................................         47,618,600             18.11
Joseph Zell(12)...................................................             30,000                 *
All Executive Officers and Directors as a group (16 persons)......        206,115,265             77.07
 
BENEFICIAL OWNERS OF 5% OR MORE OF THE OUTSTANDING COMMON STOCK OF
USI
 
Blue Chip Group(13)...............................................         30,476,136             11.59
c/o Blue Chip Venture Company, Ltd.
2000 PNC Center
201 East Fifth Street
Cincinnati, Ohio 45202
 
Grotech Capital Group(14).........................................         66,761,597             25.39
9690 Deereco Road, Suite 800
Timonium, Maryland 21093
 
Venrock Group(15).................................................         21,363,761              8.12
c/o Venrock Associates
Room 5506
30 Rockefeller Plaza
New York, New York 10112
Whitney Group(16).................................................         47,618,600             18.11
c/o J.H. Whitney & Co.
177 Broad Street
Stamford, CT 06901
 
U S WEST Communications, Inc......................................         25,480,811              9.69
1801 California Street
Denver, Colorado 80202
</TABLE>
    
 
- ------------------------
 
    * less than one percent
 
(1) Beneficial ownership is determined in accordance with the rules of the
    Securities and Exchange Commission. Except pursuant to applicable community
    property laws or as indicated in the footnotes
 
                                       47
<PAGE>
    of this table, to our knowledge, each stockholder identified in the table
    possesses sole voting and investment power with respect to all shares of
    Common Stock shown as beneficially owned by such stockholder. The number of
    shares beneficially owned by a person includes shares of Common Stock
    subject to options and warrants held by that person that are currently
    exercisable within 60 days of January 15, 1999. Shares issuable pursuant to
    options and warrants are deemed outstanding for computing the percentage
    ownership of the person holding such options and warrants but are not deemed
    outstanding for the purposes of computing the percentage ownership of any
    other person.
 
(2) For purposes of this table, the number of shares of common stock outstanding
    prior to this offering is deemed to be 262,945,025. This number includes
    15,750,000 shares of Common Stock outstanding on January 15, 1999 and an
    additional 247,195,025 shares issuable upon conversion of our Preferred
    Stock. For purposes of calculating the percentage beneficially owned by any
    person, shares of common stock issuable to such person upon the exercise of
    any options exercisable within 60 days of January 15, 1999 are also assumed
    to be outstanding. The number of shares of common stock deemed outstanding
    after this offering includes the additional underwriters' over-allotment
    option.
 
(3) Includes options to purchase 3,000,000 shares of Common Stock exercisable
    within 60 days of January 15, 1999.
 
(4) Includes 3,737,850 shares of Common Stock owned by USI Partners, Ltd. Mr.
    Meiszer is a general partner of USI Partners, Ltd. Mr. Meiszer disclaims
    beneficial ownership in the Common Stock except to the extent of his general
    partner interest in USI Partners, Ltd. Also includes options to purchase
    30,000 shares of Common Stock exercisable within 60 days of January 15,
    1999.
 
(5) Includes 9,266,079 shares of Common Stock owned by Venrock Associates and
    12,097,682 shares of Common Stock owned by Venrock Associates II, L.P. Mr.
    Rothrock is a general partner of Venrock Associates and Venrock Associates
    II, L.P. and as such shares voting and investment power with other general
    partners. Mr. Rothrock disclaims beneficial ownership in the Common Stock
    except to the extent of his general partner interests in Venrock Associates
    and Venrock Associates II, L.P. Also includes options to purchase 30,000
    shares of Common Stock exercisable within 60 days of January 15, 1999.
 
(6) Includes 23,857,086 shares of Common Stock owned by Grotech Partners IV,
    L.P. and 42,904,511 shares of Common Stock owned by Grotech Partners V L.P.
    Mr. Adams is a member of the general partner of Grotech Partners IV L.P. and
    Grotech Partners V, L.P. and as such shares voting and investment power with
    other members of the general partner. Mr. Adams disclaims beneficial
    ownership of the shares owned by Grotech Partners IV L.P. and Grotech
    Partners V L.P. Also includes options to purchase 30,000 shares of Common
    Stock exercisable within 60 days of January 15, 1999.
 
   
(7) Includes 6,000,000 shares of Common Stock owned by Southern Venture Fund
    SBIC, L.P. and 5,271,396 shares of Common Stock owned by Southern Venture
    Fund II, L.P. Mr. Earthman is a general partner of both Southern Venture
    Fund SBIC, L.P. and Southern Venture Fund II, L.P. and as such shares voting
    and investment power. Mr. Earthman disclaims beneficial ownership in the
    shares owned by Southern Venture Fund SBIC, L.P. and Southern Venture Fund
    II, L.P., except to the extent of his interests in the general partnerships
    of Southern Venture Fund SBIC, L.P. and Southern Venture Fund II, L.P. Also
    includes options to purchase 30,000 shares of Common Stock exercisable
    within 60 days of January 15, 1999. Southern Venture Fund SBIC, L.P. and
    Southern Venture Fund II, L.P. are part of an affiliated group of investment
    partnerships and are collectively referred to as the Massey Burch Group.
    
 
(8) Includes 25,904,718 shares of Common Stock owned by Blue Chip Capital Fund
    II Limited Partnership and 4,571,418 shares of Common Stock owned by Miami
    Valley Venture Fund L.P. Mr. Wyant is the founder and president of Blue Chip
    Venture Co., which manages both Blue Chip Capital Fund II Limited
    Partnership and Miami Valley Venture Fund L.P. Mr. Wyant disclaims
    beneficial ownership of
 
                                       48
<PAGE>
    the shares owned by Blue Chip Capital Fund II Limited Partnership and Miami
    Valley Venture Fund L.P. Also includes options to purchase 30,000 shares of
    Common Stock exercisable within 60 days of January 15, 1999.
 
(9) Includes options to purchase 30,000 shares of Common Stock exercisable
    within 60 days of January 15, 1999.
 
(10) Includes options to purchase 30,000 shares of Common Stock exercisable
    within 60 days of January 15, 1999.
 
(11) Includes 46,498,150 shares of Common Stock owned by J.H. Whitney III, L.P.
    and 1,120,450 shares of Common Stock owned by Whitney Strategic Partners
    III, L.P. Mr. Brooks is a general partner of J.H. Whitney & Co. and a
    Managing Member of J.H. Whitney Equity Partners III, L.L.C. which is the
    general partner of J.H. Whitney III, L.P. and Whitney Strategic Partners
    III, L.P. Mr. Brooks disclaims beneficial ownership of the shares owned by
    J.H. Whitney III, L.P and Whitney Strategic Partners III, L.P.
 
(12) Includes options to purchase 30,000 shares of Common Stock exercisable
    within 60 days of January 15, 1999.
 
(13) Includes 25,904,718 shares of Common Stock owned by Blue Chip Capital Fund
    II Limited Partnership and 4,571,418 shares of Common Stock owned by Miami
    Valley Venture Fund, L.P. Blue Chip Capital Fund II Limited Partnership and
    Miami Valley Venture Fund, L.P. are part of an affiliated group of
    investment partnerships commonly controlled by Blue Chip Venture Company and
    are collectively referred to as the Blue Chip Group.
 
   
(14) Includes 23,857,086 shares of Common Stock owned by Grotech Partners IV,
    L.P. and 42,904,511 shares of Common Stock owned by Grotech Partners V,
    L.P., Grotech Partners IV, L.P. and Grotech Partners V, L.P. are part of an
    affiliated group of investment partnerships commonly controlled by Grotech
    Capital Group and are collectively referred to as the Grotech Capital Group.
    
 
   
(15) Includes 9,266,079 shares of Common Stock owned by Venrock Associates and
    12,097,682 shares of Common Stock owned by Venrock Associates II, L.P.,
    Venrock Associates and Venrock Associates II, L.P. are affiliated entities
    collectively referred to as the Venrock Group.
    
 
   
(16) Includes 46,498,150 shares of Common Stock owned by J.H. Whitney III, L.P.
    and 1,120,450 shares of Common Stock owned by Whitney Strategic Partners
    III, L.P., J.H. Whitney III, L.P and Whitney Strategic Partners III, L.P.
    are affiliated entities collectively referred to as the Whitney Group.
    
 
                                       49
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
    The following summary of the terms and provisions of our capital stock does
not purport to be complete and is qualified in its entirety by reference to the
actual terms and provisions of the capital stock contained in our Second Amended
and Restated Certificate of Incorporation (the "Certificate") which will become
effective immediately prior to the consummation of this offering and our Bylaws,
as they will be amended at the same time.
 
    The Certificate will authorize             shares of Common Stock, par value
$  per share and       shares of Preferred Stock, par value $  per share, the
rights and preferences of which may be designated by the Board of Directors. As
of the date of this Prospectus there will be             shares of Common Stock
issued and outstanding.
 
COMMON STOCK
 
   
    Holders of Common Stock are entitled to one vote for each share held on all
matters submitted to a vote of stockholders and do not have cumulative voting
rights. Accordingly, holders of a majority of the shares of Common Stock
entitled to vote in any election of directors may elect all of the directors
standing for election. Holders of Common Stock are entitled to receive ratably
such dividends, if any, as may be declared by the Board of Directors out of
funds legally available therefor, subject to any preferential dividend rights of
outstanding Preferred Stock. Upon the liquidation, dissolution or winding up of
USI, the holders of Common Stock are entitled to receive ratably the net assets
of USI available after the payment of all debts and other liabilities and
subject to the prior rights of any outstanding Preferred Stock. Holders of the
Common Stock have no preemptive, subscription, redemption or conversion rights.
The outstanding shares of Common Stock are, and the shares that we offer in this
offering will be, when issued and paid for, validly issued, fully paid and
nonassessable. The rights, preferences and privileges of holders of Common Stock
are subject to, and may be adversely affected by, the rights of the holders of
shares of any series of Preferred Stock which we may designate and issue in the
future. Upon the closing of this offering, there will be no shares of Preferred
Stock outstanding.
    
 
PREFERRED STOCK
 
    The Board of Directors is authorized, subject to certain limitations
prescribed by law, without further stockholder approval, to issue from time to
time up to an aggregate of       shares of Preferred Stock in one or more series
and to fix or alter the designations, preferences, rights and any
qualifications, limitations or restrictions of the shares of each such series
thereof, including the dividend rights, dividend rates, conversion rights,
voting rights, terms of redemption (including sinking fund provisions),
redemption price or prices, liquidation preferences and the number of shares
constituting any series or designations of such series. The issuance of
Preferred Stock may have the effect of delaying, deferring or preventing a
change of control of USI. We have no present plans to issue any shares of
Preferred Stock.
 
WARRANTS
 
    At January 15, 1999, there were warrants outstanding to purchase a total of
11,861,317 shares of Common Stock. Warrants to purchase 7,795,722 shares at $.43
per share will expire in September 2008, warrants to purchase 900,000 shares at
$2.00 per share will expire in September and October 2008, warrants to purchase
738,095 shares at $.42 per share will expire in September 30, 2005, and warrants
to purchase 2,427,500 shares at $.42 per share will expire in June 30, 2004.
 
CERTAIN ANTI-TAKEOVER, LIMITED LIABILITY AND INDEMNIFICATION PROVISIONS
 
    As noted above, our Board of Directors, without stockholder approval, will
have the authority under the Certificate to issue Preferred Stock with rights
superior to the rights of the holders of Common Stock. As a result, Preferred
Stock could be issued quickly and easily, could adversely affect the rights of
holders
 
                                       50
<PAGE>
of Common Stock and could be issued with terms calculated to delay or prevent a
change of control of USI or make removal of management more difficult.
 
    ELECTION AND REMOVAL OF DIRECTORS.  The Certificate and Bylaws will provide
for the division of our Board of Directors into three classes, as nearly equal
in number as possible, with the directors in each class serving for a three-year
term, and one class being elected each year by our stockholders. Directors may
be removed only for cause. This system of electing and removing directors may
tend to discourage a third party from making a tender offer or otherwise
attempting to obtain control of USI and may maintain the incumbency of the Board
of Directors, as it generally makes it more difficult for stockholders to
replace a majority of directors.
 
    STOCKHOLDER MEETINGS.  Our Bylaws will provide that the stockholders may not
call a special meeting of the stockholders of the Company. Rather, only the
Board of Directors, the Chairman of the Board or the President will be able to
call special meetings of stockholders.
 
    REQUIREMENTS FOR ADVANCE NOTIFICATION OF STOCKHOLDER NOMINATIONS AND
PROPOSALS.  Our Bylaws will establish advance notice procedures with respect to
stockholder proposals and the nomination of candidates for election as
directors, other than nominations made by or at the direction of the Board of
Directors or a committee thereof.
 
    DELAWARE ANTI-TAKEOVER LAW.  We are a Delaware corporation subject to
Section 203 of the Delaware General Corporation Law. Under Section 203, certain
"business combinations" between a Delaware corporation whose stock generally is
publicly traded or held of record by more than 2,000 stockholders and an
"interested stockholder" are prohibited for a three-year period following the
date that such stockholder became an interested stockholder, unless (i) the
corporation has elected in its certificate of incorporation not to be governed
by Section 203 (we have not made such an election), (ii) the business
combination or the transaction which resulted in the stockholder becoming an
interested stockholder was approved by the board of directors of the corporation
before such stockholder became an interested stockholder, (iii) upon
consummation of the transaction that made such stockholder an interested
stockholder, the interested stockholder owned at least 85% of the voting stock
of the corporation outstanding at the commencement of the transaction (excluding
voting stock owned by directors who are also officers or held in employee
benefit plans in which the employees do not have a confidential right to tender
stock held by the plan in a tender or exchange offer) or (iv) the business
combination is approved by the board of directors of the corporation and
authorized at a meeting by two-thirds of the voting stock which the interested
stockholder did not own. The three-year prohibition also does not apply to
certain business combinations proposed by an interested stockholder following
the announcement or notification of certain extraordinary transactions involving
the corporation and a person who had not been an interested stockholder during
the previous three years or who became an interested stockholder with the
approval of a majority of the corporation's directors. The term "business
combination" is defined generally to include mergers or consolidations between a
Delaware corporation and an interested stockholder, transactions with an
interested stockholder involving the assets or stock of the corporation or its
majority-owned subsidiaries, and transactions which increase an interested
stockholder's percentage ownership of stock. The term "interested stockholder"
is defined generally as those stockholders who become beneficial owners of 15%
or more of a Delaware corporation's voting stock, together with the affiliates
or associates of that stockholder.
 
    LIMITATION OF OFFICER AND DIRECTOR LIABILITY AND INDEMNIFICATION
ARRANGEMENTS.  Our Certificate provides that an officer or director of ours will
not be personally liable to us or our stockholders for monetary damages for any
breach of his fiduciary duty as an officer or director, except in certain cases
where liability is mandated by the DGCL. The provision has no effect on any
non-monetary remedies that may be available to us or our stockholders, nor does
it relieve us or our officers or directors from compliance with federal or state
securities laws. The Certificate also generally provides that we shall
indemnify, to the fullest extent permitted by law, any person who was or is a
party or is threatened to be made a party to any
 
                                       51
<PAGE>
threatened, pending or completed action, suit, investigation, administrative
hearing or any other proceeding (each, a "Proceeding") by reason of the fact
that he is or was a director or officer of ours, or is or was serving at our
request as a director, officer, employee or agent of another entity, against
expenses incurred by him in connection with such Proceeding. An officer or
director shall not be entitled to indemnification by us if (i) the officer or
director did not act in good faith and in a manner reasonably believed to be in,
or not opposed to, our best interests, or (ii) with respect to any criminal
action or proceeding, the officer or director had reasonable cause to believe
his conduct was unlawful.
 
    These charter and bylaw provisions and provisions of Delaware law may have
the effect of delaying, deterring or preventing a change of control of USI.
 
TRANSFER AGENT AND REGISTRAR
 
          will be the transfer agent and registrar for the Common Stock.
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
   
    Upon the consummation of this offering, USI will have outstanding
shares of Common Stock (assuming no exercise of the underwriters' over-allotment
option). All of the shares of Common Stock sold in this offering will be freely
tradeable under the Securities Act, unless purchased by our "affiliates," as the
Securities Act defines that term. Upon the expiration of lock-up agreements
among USI, certain of our shareholders, our executive officers and directors and
the underwriters, which will occur 180 days after the consummation of this
offering (the "Closing Date") and exercise of all options granted under the
Stock Option Plan, 276,403,025 shares of Common Stock will become eligible for
sale, subject to compliance with Rule 144 or Rule 701 of the Securities Act as
described below.
    
 
    In general, under Rule 144 as currently in effect, a person (or persons
whose shares are aggregated) who has beneficially owned Common Stock for at
least one year will be entitled to sell in any three-month period a number of
shares that does not exceed the greater of: (i) 1% of the number of shares of
Common Stock then outstanding or (ii) the average weekly trading volume of the
Common Stock on the Nasdaq National Market during the four calendar weeks
immediately preceding the date on which the notice of sale is filed with the
Securities and Exchange Commission. Sales pursuant to Rule 144 are subject to
certain requirements relating to manner of sale, notice and availability of
current public information about USI. A person (or persons whose shares are
aggregated) who is not deemed to have been our affiliate at any time during the
three months immediately preceding the sale and who has beneficially owned
"Restricted Shares" (as defined in Rule 144) for at least two years is entitled
to sell such shares pursuant to Rule 144(k) without regard to the limitations
and requirements described above.
 
   
    Rule 701, as currently in effect, permits resales of shares in reliance upon
Rule 144 but without compliance with certain restrictions, including the holding
period requirement, of Rule 144. Any employee, officer or director of USI who
purchased shares pursuant to a written compensatory plan or contract may be
entitled to rely on the resale provisions of Rule 701. Rule 701 permits
affiliates to sell their Rule 701 shares under Rule 144 without complying with
the holding period requirements of Rule 144. Rule 701 further provides that
non-affiliates may sell such shares in reliance on Rule 144 without having to
comply with the holding period, public information, volume limitation or notice
provisions of Rule 144. All holders of Rule 701 shares who have not executed
lock-up agreements in connection with this offering will be able to sell such
shares beginning on          , 1999.
    
 
   
    Certain of our stockholders and our executive officers and directors will
agree with the underwriters that until 180 days after the Closing Date they will
not offer, sell, contract to sell, announce their intention to sell, pledge or
otherwise dispose of, directly or indirectly, or file with the Commission a
registration statement under the Securities Act relating to, any additional
shares of Common Stock or securities convertible or exchangeable or exercisable
for any shares of our Common Stock, without the prior written consent of Credit
Suisse First Boston Corporation, subject to certain exceptions. We will also
agree that we
    
 
                                       52
<PAGE>
   
will not offer, sell, contract to sell, announce our intention to sell, pledge
or otherwise dispose of, directly or indirectly, or file with the Commission a
registration statement under the Securities Act relating to, any additional
shares of Common Stock or securities convertible or exchangeable or exercisable
for any shares of our Common Stock for a period of 180 days after the Closing
Date, without the prior written consent of Credit Suisse First Boston
Corporation, subject to certain limited exceptions, including issuance by us
pursuant to the conversion of all the outstanding shares of Series A Preferred
Stock and Series B Preferred Stock or the exercise of employee stock options
outstanding on the date of this Prospectus. The lock-up agreements may be
released at any time as to all or any portion of the shares subject to such
agreements at the sole discretion of Credit Suisse First Boston Corporation. See
"Risk Factors--Shares Eligible for Future Sale."
    
 
    Certain of our stockholders have rights to require us to register shares of
Common Stock that they hold. See "Certain Relationships and Related
Transactions--Amended and Restated Stockholders' Agreement."
 
                                  UNDERWRITING
 
    Under the terms and subject to the conditions contained in an underwriting
agreement dated             , 1999, the underwriters named below, for whom
Credit Suisse First Boston Corporation, Bear, Stearns & Co. Inc., BT Alex. Brown
Incorporated and Legg Mason Wood Walker Incorporated, are acting as
representatives, have severally but not jointly agreed to purchase from us the
following respective numbers of shares of Common Stock:
 
<TABLE>
<CAPTION>
                  UNDERWRITERS                                               NUMBER OF SHARES
                                                                             -----------------
<S>                                                                          <C>
Credit Suisse First Boston Corporation.....................................
Bear, Stearns & Co. Inc....................................................
BT Alex. Brown Incorporated................................................
Legg Mason Wood Walker Incorporated........................................
                                                                                    -------
    Total..................................................................
                                                                                    -------
                                                                                    -------
</TABLE>
 
    The underwriting agreement provides that the obligations of the underwriters
are subject to certain conditions and that they will be obligated to purchase
all the shares of Common Stock offered hereby if any are purchased (other than
those shares covered by the over-allotment option described below). The
underwriting agreement provides that, in the event of a default, in certain
circumstances, the purchase commitments may be increased or the underwriting
agreement may be terminated.
 
    We have granted to the underwriters a 30-day option to purchase, on a pro
rata basis, up to       additional shares of Common Stock at the initial public
offering price, less the underwriting discounts and commissions. Such option may
be exercised only to cover over-allotments.
 
   
    The underwriters will offer the Common Stock initially at the public
offering price on the cover page of this Prospectus and to certain dealers at
such price less a concession of $           per share. The underwriters and such
dealers may allow a discount of $           per share on sales to certain other
dealers. After the initial public offering, the public offering price and
concession and discount may be changed by the representatives.
    
 
                                       53
<PAGE>
    The following table summarizes the compensation that we will pay the
underwriters and the expenses we will pay:
 
<TABLE>
<CAPTION>
                                                                                                 TOTAL
                                                                                     ------------------------------
<S>                                                                     <C>          <C>             <C>
                                                                                        WITHOUT           WITH
                                                                         PER SHARE   OVER-ALLOTMENT  OVER-ALLOTMENT
                                                                        -----------  --------------  --------------
Underwriting Discounts and Commissions paid by USI....................   $             $               $
Expenses payable by USI...............................................   $             $               $
</TABLE>
 
    The representatives have informed us that they do not expect discretionary
sales by the underwriters to exceed 5% of the shares now offered.
 
   
    USI, our officers and directors and certain other stockholders will agree
that they will not offer, sell, contract to sell, announce their intention to
sell, pledge or otherwise dispose of, directly or indirectly, or file with the
Commission a registration statement under the Securities Act relating to, any
additional shares of Common Stock or securities convertible into or exchangeable
or exercisable for any shares of our Common Stock without the prior written
consent of Credit Suisse First Boston Corporation for a period of 180 days after
the date of this Prospectus, except in the case of issuances by us pursuant to
the conversion of all the outstanding shares of Series A Preferred Stock and
Series B Preferred Stock or the exercise of employee stock options outstanding
on the date of this Prospectus.
    
 
   
    We have reserved for purchase from the underwriters up to       shares of
Common Stock which employees and friends of ours may purchase through a directed
share program. Such sales will be at the initial public offering price. The
number of shares of Common Stock available to the general public will be reduced
to the extent these persons purchase the reserved shares.
    
 
    We have agreed to indemnify the underwriters against certain liabilities,
including civil liabilities under the Securities Act, or to contribute to
payments which the underwriters may be required to make in respect thereof.
 
    We will apply to list the shares of Common Stock on The Nasdaq National
Market under the symbol "USIX."
 
    Before this offering, there has been no public market for the Common Stock.
The initial public offering price will be determined by negotiation between USI
and the representatives. The principal factors to be considered in determining
the public offering price include: the information set forth in this Prospectus
and otherwise available to the representatives; the history and the prospects
for the industry in which we will compete; the ability of our management; our
prospects for future earnings; the present state of our development and our
current financial condition; the general condition of the securities markets at
the time of this offering; and the recent market prices of, and the demand for,
publicly traded common stock of generally comparable companies.
 
    The representatives, on behalf of the underwriters, may engage in
over-allotment, stabilizing transactions, syndicate covering transactions and
penalty bids in accordance with Regulation M under the Exchange Act.
Over-allotment involves syndicate sales in excess of this offering size, which
creates a syndicate short position. Stabilizing transactions permit bids to
purchase the underlying security so long as the stabilizing bids do not exceed a
specified maximum. Syndicate covering transactions involve purchases of the
securities in the open market after the distribution has been completed in order
to cover syndicate short positions. Penalty bids permit the representatives to
reclaim a selling concession from a syndicate member when the securities
originally sold by such syndicate members are purchased in a syndicate covering
transaction to cover syndicate short positions. Such stabilizing transactions,
syndicate covering transactions and penalty bids may cause the price of the
Common Stock to be higher than it would otherwise be in the absence of such
transactions. These transactions may be effected on the Nasdaq National Market
or otherwise and, if commenced, may be discontinued at any time.
 
                                       54
<PAGE>
    BT Alex. Brown Incorporated has from time to time provided investment
banking services to us for which it has received customary fees. Legg Mason Wood
Walker Incorporated is an IMAP client of USI.
 
                          NOTICE TO CANADIAN RESIDENTS
 
RESALE RESTRICTIONS
 
    The distribution of the Common Stock in Canada is being made only on a
private placement basis exempt from the requirement that USI prepare and file a
prospectus with the securities regulatory authorities in each province where
trades of Common Stock are effected. Accordingly, any resale of the Common Stock
in Canada must be made in accordance with applicable securities laws which will
vary depending on the relevant jurisdiction, and which may require resales to be
made in accordance with available statutory exemptions or pursuant to a
discretionary exemption granted by the applicable Canadian securities regulatory
authority. Purchasers are advised to seek legal advice prior to any resale of
the Common Stock.
 
REPRESENTATIONS OF PURCHASERS
 
    Each purchaser of Common Stock in Canada who receives a purchase
confirmation will be deemed to represent to USI and the dealer from whom such
purchase confirmation is received that (i) such purchaser is entitled under
applicable provincial securities laws to purchase such Common Stock without the
benefit of a prospectus qualified under such securities laws, (ii) where
required by law, that such purchaser is purchasing as principal and not as
agent, and (iii) such purchaser has reviewed the text above under "Resale
Restrictions".
 
RIGHTS OF ACTION (ONTARIO PURCHASERS)
 
    The securities being offered are those of a foreign issuer and Ontario
purchasers will not receive the contractual right of action prescribed by
section 32 of the Regulation under the SECURITIES ACT (Ontario). As a result,
Ontario purchasers must rely on other remedies that may be available, including
common law rights of action for damages or recession or rights of action under
the civil liability provisions of the U.S. federal securities law.
 
ENFORCEMENT OF LEGAL RIGHTS
 
    All of the issuer's directors and officers as well as the experts named
herein may be located outside of Canada and, as a result, it may not be possible
for Canadian purchasers to effect service of process within Canada upon the
issuer or such persons. All or a substantial portion of the assets of the issuer
and such persons may be located outside of Canada and, as a result, it may not
be possible to satisfy a judgment against the issuer or such persons in Canada
or to enforce a judgment obtained in Canadian courts against such issuer or
persons outside of Canada.
 
NOTICE TO BRITISH COLUMBIA RESIDENTS
 
    A purchaser of Common Stock to whom the SECURITIES ACT (British Columbia)
applies is advised that such purchaser is required to file with the British
Columbia Securities Commission a report within ten days of the sale of any
Common Stock acquired by such purchaser pursuant to this offering. Such report
must be in the form attached to British Columbia Securities Commission Blanket
Order BOR #95/17, a copy of which may be obtained from USI. Only one such report
must be filed in respect of Common Stock acquired on the same date and under the
same prospectus exemption.
 
TAXATION AND ELIGIBILITY FOR INVESTMENT
 
    Canadian purchasers of Common Stock should consult their own legal and tax
advisors with respect to the tax consequences of an investment in the Common
Stock in their particular circumstances and with
 
                                       55
<PAGE>
respect to the eligibility of the Common Stock for investment by the purchaser
under relevant Canadian Legislation.
 
                                 LEGAL MATTERS
 
    The validity of the issuance of the Common Stock being offered hereby will
be passed upon for USI by Latham & Watkins, Washington, D.C. Certain legal
matters in connection with this offering will be passed upon for the
underwriters by Cahill Gordon & Reindel, a partnership including a professional
corporation, New York, New York.
 
                                    EXPERTS
 
   
    The consolidated financial statements of USINTERNETWORKING, Inc. at December
31, 1998 and for the period from January 14, 1998 (date of inception) through
December 31, 1998, appearing in this Prospectus and registration statement have
been audited by Ernst & Young LLP, independent auditors, as set forth in their
report thereon appearing elsewhere herein, and are included in reliance upon
such report given upon the authority of such firm as experts in accounting and
auditing.
    
 
   
    The combined financial statements of International Information Technology,
Inc. and International Information Technology IIT, C.A. at December 31, 1997 and
1996, and for each of the two years in the period ended December 31, 1997,
appearing in this Prospectus and Registration Statement have been audited by
Ernst & Young LLP, independent auditors, as set forth in their report thereon
appearing elsewhere herein which, as to the years 1997 and 1996, are based in
part on the report of Bassan & Associates S.C., independent auditors. The
combined financial statements referred to above are included in reliance upon
such reports given upon the authority of such firms as experts in accounting and
auditing.
    
 
    The combined financial statements of ACR as of December 31, 1997 and 1996
and for the years then ended, included in this Prospectus have been audited by
Mahoney Cohen & Company, CPA, P.C., independent auditors, as stated in their
report appearing herein.
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
   
    We have filed with the Securities and Exchange Commission, Washington, D.C.,
20549, a registration statement on Form S-1 under the Securities Act of 1933, as
amended, with respect to the Common Stock offered under this prospectus. This
prospectus does not contain all of the information set forth in the registration
statement and the exhibits and schedules to the registration statement. Certain
items are omitted in accordance with the rules and regulations of the
Commission. For further information with respect to USI and the Common Stock
offered under this prospectus, we refer you to the registration statement and
the exhibits and schedules files as a part of the registration statement.
Statements contained in this prospectus as to the contents of any contract or
any other document referred to are not necessarily complete, and, in each
instance, if the contract or document is filed as an exhibit, reference is made
to the copy of the contract or document filed as an exhibit to the registration
statement, each such statement being qualified in all respects by such reference
to such exhibit. The registration statement, including exhibits and schedules
thereto, may be inspected without charge at the public reference facilities
maintained by the Commission in Room 1024, 450 Fifth Street, N.W., Washington,
D.C., 20549, and the Commission's regional offices located at 500 West Madison
Street, Suite 1400, Chicago, Illinois, 60661 and Seven World Trade Center, 13th
Floor, New York, New York, 10048. Copies of all or any part thereof may be
obtained from the Commission after payment of fees prescribed by the Commission.
The Commission also maintains a Web Site that contains reports, proxy and
information statements and other information regarding registrants, including
us, that file electronically with the Commission. The address of this Web Site
is http://www.sec.gov. You may also contact the Commission by telephone at (800)
732-0330.
    
 
                                       56
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
   
<TABLE>
<S>                                                                                    <C>
CONSOLIDATED FINANCIAL STATEMENTS OF USINTERNETWORKING, INC.
 
  Report of Independent Auditors.....................................................  F-2
  Consolidated Balance Sheet as of December 31, 1998.................................  F-3
  Consolidated Statement of Operations for the period January 14, 1998 (date of
    inception) through December 31, 1998.............................................  F-4
  Consolidated Statement of Stockholders' Equity (Deficit) for the period January 14,
    1998 (date of inception) through December 31, 1998...............................  F-5
  Consolidated Statement of Cash Flows for the period January 14, 1998 (date of
    inception) through December 31, 1998.............................................  F-6
  Notes to Consolidated Financial Statements.........................................  F-7
 
FINANCIAL STATEMENTS OF ADVANCED COMMUNICATION RESOURCES, INC.
 
  Independent Auditor's Report.......................................................  F-22
  Balance Sheets as of December 31, 1997 and 1996 and September 30, 1998
    (unaudited)......................................................................  F-23
  Statements of Operations for the years ended December 31, 1997 and 1996 and for the
    nine months ended September 30, 1998 (unaudited).................................  F-24
  Statements of Stockholders' Equity for the years ended December 31, 1997 and 1996
    and for the nine months ended September 30, 1998 (unaudited).....................  F-25
  Statements of Cash Flows for the years ended December 31, 1997 and 1996 and for the
    nine months ended September 30, 1998 (unaudited).................................  F-26
  Notes to Financial Statements......................................................  F-27
 
COMBINED FINANCIAL STATEMENTS OF INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
  INTERNATIONAL INFORMATION TECHNOLOGY IIT, C.A.
 
  Report of Independent Auditors.....................................................  F-33
  Combined Balance Sheets as of December 31, 1997 and 1996 and as of June 30, 1998
    (unaudited)......................................................................  F-34
  Combined Statements of Operations for the years ended December 31, 1997 and 1996
    and for the six months ended June 30, 1998 (unaudited)...........................  F-35
  Combined Statements of Stockholders' Equity for the years ended December 31, 1997
    and 1996 and for the six months ended June 30, 1998 (unaudited)..................  F-36
  Combined Statements of Cash Flows for the years ended December 31, 1997 and 1996
    and for the six months ended June 30, 1998 (unaudited)...........................  F-37
  Notes to Combined Financial Statements.............................................  F-38
 
  UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS FOR THE TWELVE MONTHS
    ENDED DECEMBER 31, 1998..........................................................  P-1
</TABLE>
    
 
                                      F-1
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
To the Board of Directors and Stockholders
 
USINTERNETWORKING, Inc.
 
We have audited the accompanying consolidated balance sheet of
USINTERNETWORKING, Inc. ("the Company"), a development stage company, as of
December 31, 1998, and the related consolidated statements of operations,
stockholders' equity (deficit) and cash flows for the period January 14, 1998
(date of inception) through December 31, 1998. These financial statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audit.
 
We conducted our audit in accordance with generally accepted auditing standards.
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 audit provides a reasonable basis for our opinion.
 
In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the consolidated financial position of
USINTERNETWORKING, Inc. (a development stage company) as of December 31, 1998,
and the consolidated results of its operations and its cash flows for the period
January 14, 1998 (date of inception) through December 31, 1998, in conformity
with generally accepted accounting principles.
 
   
                                              /s/ Ernst & Young LLP
    
 
Baltimore, Maryland
 
January 22, 1999
 
                                      F-2
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
                           CONSOLIDATED BALANCE SHEET
    
 
                               DECEMBER 31, 1998
 
   
<TABLE>
<CAPTION>
                                                                                       ACTUAL        PRO FORMA
                                                                                   --------------  --------------
<S>                                                                                <C>             <C>
ASSETS
Current assets:
  Cash and cash equivalents......................................................  $   43,802,465  $   43,802,465
  Restricted cash................................................................         581,712         581,712
  Accounts receivable, less allowance of $142,000................................       2,882,119       2,882,119
  Prepaid expenses and other current assets......................................       2,436,247       2,436,247
                                                                                   --------------  --------------
Total current assets.............................................................      49,702,543      49,702,543
 
Software licenses................................................................       9,596,760       9,596,760
Property and equipment, net of accumulated depreciation of $1,567,885............      21,640,145      21,640,145
Goodwill, net of accumulated amortization of $601,667............................      26,147,392      26,147,392
Other assets.....................................................................         439,734         439,734
                                                                                   --------------  --------------
Total assets.....................................................................  $  107,526,574  $  107,526,574
                                                                                   --------------  --------------
                                                                                   --------------  --------------
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable...............................................................  $    4,854,217  $    4,854,217
  Accrued compensation...........................................................       4,870,690       4,870,690
  Other accrued expenses.........................................................       1,569,570       1,569,570
  Deferred revenue...............................................................          51,247          51,247
  Due to former shareholders of acquired businesses..............................      10,826,735      10,826,735
  Current portion of capital lease obligations...................................       1,503,947       1,503,947
  Current portion of long-term debt..............................................       1,757,588       1,757,588
                                                                                   --------------  --------------
Total current liabilities........................................................      25,433,994      25,433,994
 
Short-term obligations expected to be refinanced.................................       7,000,000       7,000,000
Capital lease obligations, less current portion..................................       3,427,254       3,427,254
Long-term debt, less current portion.............................................       5,231,794       5,231,794
Dividends payable................................................................       1,503,004       1,503,004
                                                                                   --------------  --------------
Total liabilities................................................................      42,596,046      42,596,046
 
Series B Convertible Redeemable Preferred Stock, $.01 par value, 115,000 shares
  authorized, 59,279 shares issued and outstanding actual, none pro forma;
  $62,242,500 aggregate liquidation preference...................................      62,242,500        --
 
Common Stock subject to repurchase, 10,750,000 shares............................       4,145,000       4,145,000
 
Commitments and contingent liabilities...........................................        --              --
 
Stockholders' equity (deficit):
  Series A Convertible Preferred Stock, $.01 par value, 110,000 shares
    authorized, 55,000 shares issued and outstanding; $33,000,000 aggregate
    liquidation preference.......................................................             550        --
  Common Stock, $.001 par value, 600,000,000 shares authorized, 5,000,000 shares
    issued and outstanding actual, 252,196,400 shares issued pro forma...........           5,000         252,196
  Additional paid-in capital.....................................................      35,624,554      97,620,408
  Deficit accumulated during the development stage...............................     (37,087,076)    (37,087,076)
                                                                                   --------------  --------------
  Total stockholders' equity (deficit)...........................................      (1,456,972)     60,785,528
                                                                                   --------------  --------------
 
Total liabilities and stockholders' equity (deficit).............................  $  107,526,574  $  107,526,574
                                                                                   --------------  --------------
                                                                                   --------------  --------------
</TABLE>
    
 
                            SEE ACCOMPANYING NOTES.
 
                                      F-3
<PAGE>
   
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                      CONSOLIDATED STATEMENT OF OPERATIONS
    
 
      FOR THE PERIOD JANUARY 14, 1998 (DATE OF INCEPTION) THROUGH DECEMBER 31,
                                      1998
 
   
<TABLE>
<S>                                                              <C>
Revenue........................................................  $ 4,122,449
 
Costs and expenses:
  Direct costs of revenue......................................    6,658,004
  General and administrative...................................   25,193,297
  Depreciation and amortization................................    2,169,552
                                                                 -----------
Total costs and expenses.......................................   34,020,853
                                                                 -----------
Operating loss.................................................  (29,898,404)
Other income (expense):
  Interest income..............................................      367,411
  Interest expense.............................................   (2,681,088)
                                                                 -----------
                                                                  (2,313,677)
                                                                 -----------
 
Net loss during the development stage..........................  (32,212,081)
Dividends accrued on Series A Convertible Preferred Stock......   (1,503,004)
                                                                 -----------
Net loss attributable to common stockholders...................  $(33,715,085)
                                                                 -----------
                                                                 -----------
Supplemental pro forma basic and diluted loss per common share
  attributable to common stockholders..........................  $      (.46)
                                                                 -----------
                                                                 -----------
</TABLE>
    
 
                            SEE ACCOMPANYING NOTES.
 
                                      F-4
<PAGE>
   
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
            CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT)
 FOR THE PERIOD JANUARY 14, 1998 (DATE OF INCEPTION) THROUGH DECEMBER 31, 1998
    
   
<TABLE>
<CAPTION>
                                                                                    SERIES A CONVERTIBLE
                                                                                      PREFERRED STOCK            COMMON STOCK
                                                                                  ------------------------  ----------------------
                                                                                   SHARES      PAR VALUE     SHARES     PAR VALUE
                                                                                  ---------  -------------  ---------  -----------
<S>                                                                               <C>        <C>            <C>        <C>
Balance at January 14, 1998.....................................................         --    $      --           --   $      --
  Issuance of Common Stock to founder upon inception for cash...................         --           --    5,000,000       5,000
  Issuance of Series A Convertible Preferred Stock on May 28, 1998 for cash.....     38,333          383           --          --
  Issuance of Series A Convertible Preferred Stock on May 28, 1998 in exchange
    for $1,000,000 note.........................................................      1,667           17           --          --
  Issuance of Series A Convertible Preferred Stock on June 22, 1998 for cash....      6,167           62           --          --
  Issuance of Series A Convertible Preferred Stock on July 2, 1998 for cash.....      5,833           58           --          --
  Issuance of Series A Convertible Preferred Stock on July 30, 1998 for cash....      3,000           30           --          --
  Transaction costs associated with the issuance of Series A Convertible
    Preferred Stock.............................................................         --           --           --          --
  Issuance of warrants to purchase 400,000 shares of Common Stock associated
    with the acquisition of IIT on September 7, 1998............................         --           --           --          --
  Issuance of warrants to purchase 7,795,722 shares of Common Stock in
    connection with $9,095,000 of debt on September 7, 1998.....................         --           --           --          --
  Issuance of warrants to purchase 595,238 shares of Common Stock in connection
    with a $5,000,000 financing commitment on September 22, 1998................         --           --           --          --
  Issuance of warrants to purchase 971 shares of Series B Convertible Redeemable
    Preferred Stock in connection with a $10,000,000 financing commitment on
    September 30, 1998..........................................................         --           --           --          --
  Issuance of warrants to purchase 500,000 shares of Common Stock associated
    with the acquisition of ACR on October 2, 1998..............................         --           --           --          --
  Issuance of warrants to purchase 142,857 shares of Common Stock in connection
    with a $2,000,000 financing commitment on December 18, 1998.................         --           --           --          --
  Dividends accrued on Series A Convertible Preferred Stock.....................         --           --           --          --
  Accretion of Common Stock subject to repurchase to fair value.................         --           --           --          --
  Accretion of Series B Convertible Redeemable Preferred Stock to redemption
    value.......................................................................         --           --           --          --
  Net loss for the period January 14, 1998 through December 31, 1998............         --           --           --          --
                                                                                  ---------        -----    ---------  -----------
Balance at December 31, 1998....................................................     55,000    $     550    5,000,000   $   5,000
                                                                                  ---------        -----    ---------  -----------
                                                                                  ---------        -----    ---------  -----------
 
<CAPTION>
                                                                                                DEFICIT
                                                                                              ACCUMULATED      TOTAL
                                                                                  ADDITIONAL   DURING THE   STOCKHOLDERS'
 
                                                                                   PAID-IN    DEVELOPMENT      EQUITY
                                                                                   CAPITAL       STAGE       (DEFICIT)
                                                                                  ----------  ------------  ------------
<S>                                                                               <C>         <C>           <C>
Balance at January 14, 1998.....................................................  $       --   $       --    $       --
  Issuance of Common Stock to founder upon inception for cash...................          --           --         5,000
  Issuance of Series A Convertible Preferred Stock on May 28, 1998 for cash.....  22,999,617           --    23,000,000
  Issuance of Series A Convertible Preferred Stock on May 28, 1998 in exchange
    for $1,000,000 note.........................................................     999,983           --     1,000,000
  Issuance of Series A Convertible Preferred Stock on June 22, 1998 for cash....   3,699,938           --     3,700,000
  Issuance of Series A Convertible Preferred Stock on July 2, 1998 for cash.....   3,499,942           --     3,500,000
  Issuance of Series A Convertible Preferred Stock on July 30, 1998 for cash....   1,799,970           --     1,800,000
  Transaction costs associated with the issuance of Series A Convertible
    Preferred Stock.............................................................    (205,225)          --      (205,225)
  Issuance of warrants to purchase 400,000 shares of Common Stock associated
    with the acquisition of IIT on September 7, 1998............................      40,000           --        40,000
  Issuance of warrants to purchase 7,795,722 shares of Common Stock in
    connection with $9,095,000 of debt on September 7, 1998.....................   1,948,930           --     1,948,930
  Issuance of warrants to purchase 595,238 shares of Common Stock in connection
    with a $5,000,000 financing commitment on September 22, 1998................     148,810           --       148,810
  Issuance of warrants to purchase 971 shares of Series B Convertible Redeemable
    Preferred Stock in connection with a $10,000,000 financing commitment on
    September 30, 1998..........................................................     606,875           --       606,875
  Issuance of warrants to purchase 500,000 shares of Common Stock associated
    with the acquisition of ACR on October 2, 1998..............................      50,000           --        50,000
  Issuance of warrants to purchase 142,857 shares of Common Stock in connection
    with a $2,000,000 financing commitment on December 18, 1998.................      35,714           --        35,714
  Dividends accrued on Series A Convertible Preferred Stock.....................          --   (1,503,004)   (1,503,004)
  Accretion of Common Stock subject to repurchase to fair value.................          --   (3,135,000)   (3,135,000)
  Accretion of Series B Convertible Redeemable Preferred Stock to redemption
    value.......................................................................          --     (236,991)     (236,991)
  Net loss for the period January 14, 1998 through December 31, 1998............          --  (32,212,081)  (32,212,081)
                                                                                  ----------  ------------  ------------
Balance at December 31, 1998....................................................  $35,624,554 ($37,087,076)  $(1,456,972)
 
                                                                                  ----------  ------------  ------------
                                                                                  ----------  ------------  ------------
</TABLE>
    
 
                                      F-5
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
                      CONSOLIDATED STATEMENT OF CASH FLOWS
    
 
 FOR THE PERIOD JANUARY 14, 1998 (DATE OF INCEPTION) THROUGH DECEMBER 31, 1998
 
   
<TABLE>
<S>                                                                              <C>
OPERATING ACTIVITIES
Net loss during the development stage..........................................  $(32,212,081)
Adjustments to reconcile net loss during the development stage to net cash used
  in operating activities:
  Depreciation.................................................................    1,567,885
  Amortization.................................................................      601,667
  Non-cash compensation expense related to the issuance of Common Stock........    1,000,000
  Non-cash interest expense....................................................    2,011,904
  Changes in operating assets and liabilities:
    Accounts receivable........................................................       43,293
    Prepaid expenses and other current assets..................................   (2,470,745)
    Accounts payable...........................................................    4,333,579
    Accrued compensation.......................................................    4,287,023
    Accrued expenses and other current liabilities.............................      234,800
                                                                                 -----------
Net cash used in operating activities..........................................  (20,602,675)
 
INVESTING ACTIVITIES
Purchases of property and equipment............................................  (20,127,849)
Increase in restricted cash....................................................     (581,712)
Acquisition of IIT and ACR, net of cash acquired of $398,581...................  (16,899,991)
Increase in other assets.......................................................      (59,080)
                                                                                 -----------
Net cash used in investing activities..........................................  (37,668,632)
 
FINANCING ACTIVITIES
Proceeds from issuance of Series A Convertible Preferred Stock.................   31,794,775
Proceeds from loan from officer, subsequently converted into Series A
  Convertible Preferred Stock..................................................    1,000,000
Proceeds from issuance of Series B Convertible Redeemable Preferred Stock......   39,910,509
Proceeds from issuance of Common Stock and Common Stock subject to
  repurchase...................................................................       15,000
Proceeds from issuance of long-term debt.......................................    9,486,969
Proceeds from issuance of notes, subsequently converted into Series B
  Convertible Redeemable Preferred Stock.......................................   22,095,000
Payments on long-term debt.....................................................   (1,804,876)
Payments on capital lease obligations..........................................     (423,605)
                                                                                 -----------
Net cash provided by financing activities......................................  102,073,772
                                                                                 -----------
Cash and cash equivalents at end of period.....................................  $43,802,465
                                                                                 -----------
                                                                                 -----------
</TABLE>
    
 
                            SEE ACCOMPANYING NOTES.
 
                                      F-6
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
    
 
                               DECEMBER 31, 1998
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
DESCRIPTION OF BUSINESS
 
   
    USINTERNETWORKING, Inc., (the "Company") was incorporated on January 14,
1998 principally to provide clients the ability to use leading business software
applications through the Company's Internet-based network. The Company is an
"Internet Managed Application Provider.-SM-" Our IMAP services integrate
Internet communications, data center management and packaged software
applications implementation and support to meet the technology needs of business
in a number of business process areas including sales force automation, customer
support, e-commerce, and human resource and financial systems. The Company also
makes its infrastructure available to clients who want to run their own
applications in a highly reliable and secure Internet environment and provides
information technology consulting services.
    
 
   
    Since its inception in January 1998, the Company has devoted substantially
all of its efforts to raising capital, developing its network infrastructure,
recruiting and training personnel and establishing strategic business
partnerships with software application providers. Substantially all revenues
since inception have been earned from information technology consulting
services. Accordingly, insignificant revenue has been generated from planned
principal operations, and the Company is considered a development stage company
at December 31, 1998.
    
 
BASIS OF PRESENTATION
 
    The accompanying consolidated financial statements include the accounts of
the Company and its wholly-owned subsidiaries. Intercompany transactions and
balances have been eliminated.
 
USE OF ESTIMATES
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the consolidated financial
statements and accompanying notes. Actual results could differ from those
estimates.
 
CASH AND CASH EQUIVALENTS
 
    The Company considers all money market accounts and all other investments
with a maturity of three months or less when purchased to be cash equivalents.
The carrying value of cash equivalents approximates fair value.
 
RESTRICTED CASH
 
    At December 31, 1998, $581,712 of cash was pledged as collateral on
outstanding letters of credit related to an operating lease for certain office
space ($400,000), and as security for other obligations ($181,712). These
amounts have been classified as restricted cash in the accompanying consolidated
balance sheet.
 
                                      F-7
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
   
SOFTWARE LICENSES
    
 
   
    The Company capitalizes the costs associated with the purchase of perpetual
licenses for major business process application software used in providing IMAP
services. These licenses specify the number of users permitted to utilize the
license in connection with the Company's service. These costs will be amortized
over the minimum contract period for IMAP clients subject to these licenses. At
December 31, 1998 no clients were subject to the purchased licenses and no
amortization had been recorded.
    
 
PROPERTY AND EQUIPMENT
 
   
    Property and equipment is stated at cost less accumulated depreciation.
Depreciation is computed for owned assets using the straight-line method over
estimated useful lives of the assets. Assets under capital leases are amortized
using the straight-line method over the lesser of the lease term or the
estimated useful life of the assets.
    
 
    Estimated useful lives for all depreciable assets other than a building and
leasehold improvements range from three to seven years. The building is
depreciated over 25 years and leasehold improvements are depreciated over the
term of the related lease.
 
INCOME TAXES
 
    The Company uses the liability method in accounting for income taxes. Under
this method, deferred income tax assets and liabilities are determined based on
differences between financial reporting and tax bases of assets and liabilities
and are measured using the enacted tax rates and laws that will be in effect
when the differences are expected to reverse.
 
REVENUE RECOGNITION
 
   
    Substantially all revenues since inception have been earned from information
technology consulting services. Revenues are recognized as services are
provided.
    
 
GOODWILL AMORTIZATION
 
    The Company amortizes goodwill arising from certain purchase business
combinations on a straight-line basis over its estimated useful life of 15
years.
 
ADVERTISING COSTS
 
    The Company expenses advertising as incurred. Advertising expense totaled
approximately $700,000 in 1998.
 
   
IMPAIRMENT OF LONG-LIVED ASSETS
    
 
    Long-lived assets, consisting principally of property and equipment and
goodwill, are evaluated for possible impairment through a review of undiscounted
expected future cash flows. If the sum of the undiscounted expected future cash
flows is less than the carrying amount of the asset, an impairment loss is
recognized.
 
                                      F-8
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
STOCK OPTIONS
 
   
    The Company records compensation expense for all stock-based compensation
plans using the intrinsic value method prescribed by Accounting Principles Board
Opinion No. 25, ACCOUNTING FOR STOCK ISSUED TO EMPLOYEES ("APB No. 25"). Under
APB No. 25, if the exercise price of the Company's employee stock options equals
or exceeds the estimated fair value of the underlying stock on the date of
grant, no compensation expense is generally recognized.
    
 
    Financial Accounting Standards Board Statement No. 123, ACCOUNTING FOR
STOCK-BASED COMPENSATION ("Statement No. 123") encourages companies to recognize
expense for stock-based awards based on their estimated value on the date of
grant. Statement No. 123 requires the disclosure of pro forma net income or loss
in the notes to the financial statements if the fair value method is not
elected. The Company accounts for its stock-based compensation using the
intrinsic value method, and has determined that the use of the fair value method
to record compensation expense would have no effect on the reported net loss in
1998.
 
2. ACQUISITIONS
 
   
    Effective September 7, 1998, the Company acquired all of the outstanding
common stock of IIT Holding, Inc. (IIT), a provider of Internet and intranet
consulting, integration and support services principally to commercial companies
located throughout the United States and South America. The initial purchase
price consisted of cash of $12,887,000 and warrants to purchase 400,000 shares
of Common Stock for $2.00 per share valued at $40,000. Direct acquisition costs
of $394,968 were also incurred. The acquisition was accounted for using the
purchase method of accounting, and the results of operations of IIT are included
in the accompanying consolidated statement of operations for the period from
September 7, 1998 through December 31, 1998. At the acquisition date,
$14,131,788 of goodwill was recorded.
    
 
   
    Additional contingent consideration is payable to the former shareholders of
IIT to the extent that defined amounts of revenue, earnings before interest,
income taxes, depreciation and amortization (EBITDA), and employee retention
percentages (as related to the operations of IIT) in 1998 are exceeded. The
maximum amount of contingent consideration payable to the sellers is $3,799,999.
At December 31, 1998, the Company has preliminarily determined that the likely
amount of additional consideration due to the sellers is $2,326,735, subject to
final audit results, and therefore has recorded that amount as additional
goodwill.
    
 
   
    On October 2, 1998, the Company acquired all of the outstanding common stock
of Advanced Communication Resources, Inc. (ACR), a New York based systems
integrator focused on the financial services industry. The initial purchase
price aggregated $6,050,000, consisting of cash of $2,500,000, a $3,500,000
secured promissory note bearing interest at 8.25%, and warrants to purchase
500,000 shares of common stock for $2.00 per share valued at $50,000. Direct
acquisition costs of $338,916 were also incurred. The acquisition was accounted
for using the purchase method of accounting, and the results of operations of
ACR are included in the accompanying consolidated statement of operations for
the period from October 2, 1998 through December 31, 1998. At the acquisition
date, $5,290,535 of goodwill was recorded.
    
 
    Additional contingent consideration is payable to the former shareholders of
ACR to the extent that defined amounts of revenue, EBITDA, and employee
retention percentages (as related to the operations
 
                                      F-9
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
2. ACQUISITIONS (CONTINUED)
   
of ACR) in 1998 are exceeded. The maximum amount of contingent consideration
payable to the sellers is $5,000,000. At December 31, 1998, the Company has
determined that the amount of additional consideration due to the sellers is
$5,000,000, and therefore has recorded that amount as additional goodwill.
    
 
   
    The following summarizes unaudited pro forma consolidated results of
operations for 1998 assuming the IIT and ACR acquisitions had occurred at the
beginning of the year. The results are not necessarily indicative of what would
have occurred had these transactions been consummated as of the beginning of the
year presented, or of future operations of the Company (in thousands):
    
 
   
<TABLE>
<CAPTION>
                                                                         PRO FORMA (UNAUDITED)
                                                                         ---------------------
<S>                                                                      <C>
Revenue................................................................       $    13,938
Net loss...............................................................       $   (34,268)
Basic and diluted loss per common share (supplemental).................       $      (.46)
</TABLE>
    
 
3. LOSS PER SHARE
 
    The following table sets forth the computation of basic and diluted loss per
common share for the period from January 14, 1998 (date of inception) through
December 31, 1998:
 
HISTORICAL:
 
<TABLE>
<S>                                                                              <C>
Numerator:
  Net loss.....................................................................  $(32,212,081)
  Dividends on Series A Convertible Preferred Stock............................   (1,503,004)
                                                                                 -----------
                                                                                 $(33,715,085)
                                                                                 -----------
                                                                                 -----------
Denominator:
  Weighted-average number of shares of Common Stock outstanding during the
    period.....................................................................    9,472,222
  Shares of Common Stock issued for a nominal value............................    5,000,000
                                                                                 -----------
                                                                                  14,472,222
                                                                                 -----------
                                                                                 -----------
Basic and diluted loss per common share........................................  $     (2.33)
                                                                                 -----------
                                                                                 -----------
</TABLE>
 
   
    Basic loss per share is based upon the average number of shares of Common
Stock outstanding during the period. As required by the Securities and Exchange
Commission in Staff Accounting Bulletin No. 98, all securities issued by the
Company for a nominal value have been included in the computation as if they
were outstanding since inception. In July 1998 the Company issued 5,000,000
shares of Common Stock to an officer for total consideration of $5,000, an
amount significantly below the estimated fair value of the Common Stock.
Therefore, these shares were considered to be outstanding for the entire period.
    
 
    Dilutive loss per common share is equal to basic loss per common share
because if potentially dilutive securities were included in the computation, the
result would be anti-dilutive. These potentially dilutive securities consist of
convertible preferred stocks, stock options and warrants.
 
                                      F-10
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
3. LOSS PER SHARE (CONTINUED)
SUPPLEMENTAL PRO FORMA:
 
   
    Pro forma basic and diluted loss per common share attributable to common
stockholders is presented to disclose the effect on loss per share of the
assumed conversion of securities which will convert into Common Stock upon the
closing of the proposed initial public offering. For purposes of the pro forma
computation, the convertible securities are assumed to have been converted on
the issuance date.
    
 
    The following table summarizes the computations of supplemental pro forma
basic and diluted loss per share presented in the accompanying consolidated
statement of operations for the period January 14, 1998 (date of inception)
through December 31, 1998:
 
<TABLE>
<S>                                                                              <C>
Numerator:
  Net loss.....................................................................  $(32,212,081)
  Dividends on Series A Convertible Preferred Stock............................   (1,503,004)
                                                                                 -----------
                                                                                 $(33,715,085)
                                                                                 -----------
                                                                                 -----------
Denominator:
  Shares used in historical calculation........................................   14,472,222
  Add:
    Pro forma conversion of Series A Convertible Preferred Stock...............   58,928,205
    Pro forma conversion of Series B Convertible Redeemable Preferred Stock....      406,699
                                                                                 -----------
    Denominator for pro forma loss per share...................................   73,807,126
                                                                                 -----------
                                                                                 -----------
Supplemental pro forma basic and diluted loss per common share.................  $      (.46)
                                                                                 -----------
                                                                                 -----------
</TABLE>
 
4. SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
 
    During the period from January 14, 1998 (date of inception) through December
31, 1998, the Company acquired equipment totaling $5,188,489 under leases
classified as capital leases.
 
   
    Interest paid during the period was approximately $368,000.
    
 
5. PROPERTY AND EQUIPMENT
 
    Property and equipment consists of the following at December 31, 1998:
 
   
<TABLE>
<S>                                                                             <C>
Building and land.............................................................  $ 1,007,499
Furniture and fixtures........................................................      779,332
Equipment and automobiles.....................................................    2,800,742
Computers and software........................................................   15,321,325
Leasehold improvements........................................................    3,299,132
                                                                                -----------
                                                                                 23,208,030
Accumulated depreciation......................................................   (1,567,885)
                                                                                -----------
Total.........................................................................  $21,640,145
                                                                                -----------
                                                                                -----------
</TABLE>
    
 
                                      F-11
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
5. PROPERTY AND EQUIPMENT (CONTINUED)
   
    Substantially all property and equipment is collateralized under financing
arrangements.
    
 
6. CAPITAL LEASE OBLIGATIONS
 
    The Company has entered into capital lease agreements to acquire certain
equipment. Property and equipment in the accompanying consolidated balance sheet
includes this equipment which has a cost of $5,188,489 and accumulated
amortization of $349,716. Amortization of the leased property is included in
depreciation and amortization expense.
 
    Future minimum payments under capital lease obligations consist of the
following at December 31, 1998:
 
   
<TABLE>
<S>                                                                               <C>
1999............................................................................  $1,965,377
2000............................................................................   1,941,590
2001............................................................................   1,789,256
2002............................................................................      91,995
2003............................................................................      80,420
                                                                                  ----------
Total minimum lease payments....................................................   5,868,638
Amounts representing interest...................................................    (937,437)
                                                                                  ----------
Present value of capital lease obligations......................................   4,931,201
Current portion.................................................................  (1,503,947)
                                                                                  ----------
Capital lease obligations, non-current..........................................  $3,427,254
                                                                                  ----------
                                                                                  ----------
</TABLE>
    
 
   
7. DUE TO FORMER SHAREHOLDERS OF ACQUIRED BUSINESSES
    
 
   
    In connection with the acquistion of ACR in October 1998, the Company issued
to the sellers a $3,500,000 note bearing interest at 8.25% per annum. The note,
including accrued interest, was due and was paid in January 1999.
    
 
   
    As more fully disclosed in Note 2, the Company estimates that additional
consideration related to the acquisitions of ACR and IIT in 1998 will be
required to be paid in 1999 in the aggregate amount of $7,326,735.
    
 
   
8. LONG-TERM DEBT
    
 
   
    Long-term debt at December 31, 1998 consists of the following:
    
 
   
<TABLE>
<S>                                                                              <C>
Note payable to a bank due June 30, 2001 and bearing interest at 9.0% per
  annum. The note is payable in monthly installments of principal and interest
  of $6,644 with all unpaid principal and interest due at maturity. The note is
  secured by a mortgage on the real property purchased with the proceeds and
  with a $79,929 letter of credit pledged as additional security...............  $  639,517
</TABLE>
    
 
                                      F-12
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
8. LONG-TERM DEBT (CONTINUED)
    
   
<TABLE>
<S>                                                                              <C>
Note payable to a bank due July 21, 2001 and bearing interest at 9.0% per
  annum. The note is payable in monthly installments of principal and interest
  of $2,249 with all unpaid principal and interest due at maturity. The note is
  secured by a mortgage on the property purchased with the proceeds and with a
  $26,984 letter of credit pledged as additional security......................     217,689
 
Notes payable due on August 1, 2001 and bearing interest at 13.1% per annum.
  The notes are payable in monthly installments of principal and interest of
  $77,429 and are collateralized by certain furniture, fixtures, equipment and
  software purchased by the Company............................................   2,081,563
 
Note payable due on September 1, 2001 and bearing interest at 13.0% per annum.
  The note is payable in monthly installments of principal and interest of
  $4,868 and is collateralized by certain furniture, fixtures, equipment and
  software purchased by the Company............................................     134,519
 
Note payable due on October 1, 2001 and bearing interest at 17.1% per annum.
  The note is payable in monthly installments of principal and interest of
  $158,000 with all unpaid principal and interest due at maturity. This note is
  collateralized by certain software licenses purchased by the Company.........   4,501,175
 
Notes payable due between February 28, 2003 and February 19, 2004 and bearing
  interest at rates ranging from 9.25% to 9.99% per annum. The notes are
  payable in monthly installments of principal and interest ranging from $542
  to $1,274 and are secured by automobiles purchased with the proceeds.........     107,630
                                                                                 ----------
Total..........................................................................   7,682,093
Less: current portion..........................................................   1,757,588
Less: discounts................................................................     692,711
                                                                                 ----------
                                                                                 $5,231,794
                                                                                 ----------
                                                                                 ----------
</TABLE>
    
 
    Aggregate maturities of long-term debt at December 31, 1998 are as follows:
 
   
<TABLE>
<S>                                                                              <C>
1999...........................................................................  $2,009,483
2000...........................................................................   2,342,948
2001...........................................................................   3,283,700
2002...........................................................................      25,337
2003 and thereafter............................................................      20,625
                                                                                 ----------
Total..........................................................................  $7,682,093
                                                                                 ----------
                                                                                 ----------
</TABLE>
    
 
    At December 31, 1998, the fair value of long-term debt approximates its
carrying value.
 
   
9. SHORT-TERM OBLIGATIONS EXPECTED TO BE REFINANCED
    
 
    At December 31, 1998, the Company had outstanding current liabilities for
the purchase of fixed assets of $7,500,000, for which the Company had
outstanding commitments to finance on a long-term basis.
 
                                      F-13
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
9. SHORT-TERM OBLIGATIONS EXPECTED TO BE REFINANCED (CONTINUED)
    
   
The Company intends to utilize these commitments in early 1999, and has
therefore classified $7,000,000, or the portion of the $7,500,000 financing that
will be due after 1999, of the obligations as long-term. These obligations will
bear interest at rates from 9% to 17% per annum, and will mature in varying
installments through January 2002.
    
 
   
10. PREFERRED STOCK
    
 
   
    The Company has authorized the issuance of up to 225,000 shares of preferred
stock, par value $.01 per share, of which 110,000 has been designated Series A
Convertible Preferred Stock ("Series A") and 115,000 has been designated Series
B Convertible Redeemable Preferred Stock ("Series B"). During 1998, the Company
issued 55,000 shares of Series A for a total aggregate purchase price of $33
million, and 59,279 shares of Series B for a total aggregate purchase price of
$62.2 million, including $22.1 million of Series B issued upon conversion of
notes payable.
    
 
SERIES A:
 
CONVERSION RIGHTS
 
   
    The Series A is convertible into Common Stock at the option of the holder at
any time. In addition, the Series A will convert automatically into shares of
Common Stock upon the closing of an underwritten public offering of at least $50
million of net proceeds to the Company with a minimum valuation of fully-diluted
common equity (pre-offering) of $300 million. Each share of Series A is
convertible into 1,800 shares of Common Stock. This conversion ratio is subject
to adjustment upon the occurrence of certain specified dilutive events.
    
 
DIVIDENDS
 
    The holders of the Series A are entitled to receive cumulative quarterly
dividends at the annual rate of $48 per share with payments commencing on
January 1, 2000. All accrued but unpaid dividends are payable at the closing of
an underwritten public offering of at least $50 million of net proceeds to the
Company with a minimum valuation of fully-diluted common equity (pre-offering)
of $300 million, or upon the conversion of the Series A into Common Stock.
 
LIQUIDATION
 
    Each share of Series A has a preference on liquidation equal to $600 per
share plus all accrued and unpaid dividends. The holders of the Series A may
also be entitled to an additional distribution based on the fair market value of
the net assets of the Company as determined by the Board of Directors.
 
VOTING RIGHTS
 
    Each share of Series A has substantially the same voting rights as the
number of shares of Common Stock into which it can be converted. In addition,
certain corporate actions require the consent of two-thirds of the outstanding
shares of Series A.
 
                                      F-14
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
10. PREFERRED STOCK (CONTINUED)
    
SERIES B:
 
CONVERSION RIGHTS
 
    The Series B is convertible into Common Stock at the option of the holder at
any time. In addition, the Series B will convert automatically into shares of
Common Stock upon the closing of an underwritten public offering of at least $50
million of net proceeds to the Company with a minimum valuation of fully-diluted
common equity (pre-offering) of $300 million. Each share of Series B is
convertible into 2,500 shares of Common Stock. This conversion ratio is subject
to adjustment upon the occurrence of certain specified dilutive events.
 
REDEMPTION RIGHTS
 
    Each share of Series B is mandatorily redeemable on December 31, 2006, if
still outstanding, for an amount equal to the liquidation preference.
 
DIVIDENDS
 
    The holders of the Series B are entitled to receive cumulative quarterly
dividends at the annual rate of $84 per share with payments commencing on
January 1, 2000. All accrued but unpaid dividends are payable at the closing of
an underwritten public offering of at least $50 million of net proceeds to the
Company with a minimum valuation of fully-diluted common equity (pre-offering)
of $300 million, or upon the conversion of the Series B into Common Stock. No
dividends may be paid on the Series A unless dividends due to Series B holders
have been paid.
 
LIQUIDATION
 
    Each share of Series B has a preference on liquidation equal to the greater
of $1,050 per share plus all accrued and unpaid dividends or the amount that
would be received on an as-converted basis.
 
VOTING RIGHTS
 
    Each share of Series B has substantially the same voting rights as the
number of shares of Common Stock into which it can be converted
 
   
11. COMMON STOCK SUBJECT TO REPURCHASE
    
 
   
    The Company has sold 10,750,000 shares of Common Stock to three officers
that require the Company to repurchase the Common Stock at fair value in the
event of disability or death.
    
 
   
    The Company initially recorded the Common Stock subject to repurchase at an
amount equal to the consideration received of $1,010,000, and has accreted the
Common Stock subject to repurchase to its estimated fair value at December 31,
1998 of $.39 per share, or an aggregate amount of $4,145,500, through charges to
accumulated deficit. The estimated value per share of $.39 at December 31, 1998
was determined through an independent appraisal of the Company's Common Stock.
    
 
                                      F-15
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
12. STOCK WARRANTS
    
 
   
    In 1998, in connection with the issuance of debt or capital leases, the
Company issued warrants to purchase 8,533,817 shares of Common Stock and
warrants to purchase 971 shares of Series B. The Common Stock warrants expire
from 2003 through 2008, and are exerciseable for $0.42 or $0.43 per share. The
warrants to purchase Series B expire in 2004 and are exerciseable for $1,050 per
share (or $0.42 per common equivalent share).
    
 
   
    Upon issuance, the Company estimated the value of the warrants considering
the various terms, including the exercise price of the warrants, the estimated
fair value of the Company's Common Stock, and the length of time the warrants
are exerciseable. The range of values assigned to the warrants was $.10 to $.26
per share, and the total value assigned was $2,740,329. This amount was recorded
as additional paid-in capital, and a corresponding debt discount was recorded
that is being recognized as additional interest expense over the term of the
related debt or capital lease.
    
 
    Also, as discussed in Note 2, the Company issued warrants to purchase
900,000 shares of Common Stock in connection with the acquisition of IIT and
ACR. These warrants expire in 2008 and are exerciseable for $2.00 per share.
 
   
    During 1998, no warrants issued were exercised. A summary of warrants
outstanding at December 31, 1998 is as follows:
    
 
   
<TABLE>
<CAPTION>
                                EXERCISE
      NUMBER OF SHARES            PRICE       EXPIRATION DATE
- ----------------------------  -------------  ------------------
<S>                           <C>            <C>
COMMON STOCK:
 142,857                        $     .42         December 2003
 595,238                        $     .42             June 2004
7,795,722                       $     .43        September 2008
 400,000                        $    2.00        September 2008
 500,000                        $    2.00          October 2008
 
SERIES B PREFERRED STOCK:
     971                        $   1,050             June 2004
</TABLE>
    
 
   
13. SHARES RESERVED FOR FUTURE ISSUANCE
    
 
   
    As of December 31, 1998, the Company has reserved 99,000,000 shares and
148,196,400 shares of Common Stock for future issuance upon the conversion of
the Series A and Series B, respectively. In addition, the Company has reserved
13,458,000 shares of Common Stock for future issuance upon the exercise of stock
options eligible for granting under the 1998 Stock Option Plan (see Note 14),
and 11,861,317 shares of Common Stock attributable to outstanding warrants
issued in 1998.
    
 
   
14. STOCK COMPENSATION PLAN
    
 
    Effective July 2, 1998, the Company adopted the 1998 Stock Option Plan of
USINTERNETWORKING, Inc. ("the Plan") which is administered by the Compensation
Committee of the Board of Directors. The Plan provides for the granting of
either qualified or non-qualified options to purchase an aggregate of up to
13,458,000 shares of Common Stock to eligible employees, officers, directors and
consultants of the Company.
 
                                      F-16
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
14. STOCK COMPENSATION PLAN (CONTINUED)
    
    A summary of the Company's stock option activity, and related information
for the year ended December 31, 1998 follows:
 
   
<TABLE>
<CAPTION>
                                                                                          NUMBER
                                                                                            OF
                                                                                         OPTIONS     EXERCISE PRICE
                                                                                       ------------  ---------------
<S>                                                                                    <C>           <C>
Granted..............................................................................    13,673,000     $    0.33
Forfeited............................................................................      (215,000)         0.33
 
Outstanding at end of year...........................................................    13,458,000
 
Exercisable at end of year...........................................................    13,458,000
</TABLE>
    
 
   
    The exercise price for all options outstanding as of December 31, 1998 is
$0.33. These options vested immediately upon the date of grant. Shares of Common
Stock purchased pursuant to these options will be subject to the Company's right
to repurchase them at the option exercise price upon the termination of the
holder's employment or business relationship with the Company. The repurchase
right will lapse with respect to one-third of the shares purchasable upon
exercise of an option on the first anniversary of the date of grant of the
option. The repurchase right with respect to the remainder of the shares
purchasable upon exercise of an option will lapse in equal quarterly
installments over the subsequent eight calendar quarters. The options expire 10
years from the date of issuance. At December 31, 1998, the weighted-average
remaining contractual life of outstanding options is 9.7 years.
    
 
    For the year ended December 31, 1998, pro forma net loss and loss per share
information required by Statement 123 has been determined using the minimum
value method. The minimum value method calculates the fair value of options as
the excess of the estimated fair value of the underlying stock at the date of
grant over the present value of both the exercise price and the expected
dividend payments, each discounted at the risk-free rate, over the expected life
of the option. In determining the estimated fair value of granted stock options
under the minimum value method, the risk-free interest rate was assumed to be
5.50%, the dividend yield was estimated to be 0% and the expected life of
granted options was assumed to be four years.
 
    Because changes in the subjective input assumptions can materially affect
the fair value estimate, in management's opinion, the minimum value method and
other methods prescribed by Statement 123 do not necessarily provide a single
measure of the fair value of its employee stock options.
 
   
    The grant-date fair value of all options granted during 1998 using the
minimum value method was less than $.01, thus no pro forma information has been
presented. The exercise price at the grant-date of all options granted through
December 31, 1998 was greater than the market value of the underlying Common
Stock on the grant-date, as determined by independent appraisal. As a result,
the Company has not recognized compensation expense related to these options.
    
 
   
15. INCOME TAXES
    
 
   
    At December 31, 1998, the Company has a U.S. federal net operating loss
carryforward of $20 million. This carryforward expires in 2013. The amount
available to be used in any given year will be limited by operation of certain
provisions of the Internal Revenue Code. The Company also has U.S. state net
    
 
                                      F-17
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
15. INCOME TAXES (CONTINUED)
    
   
operating loss carryforwards available, the utilization of which will be
similarly limited. The Company has established a valuation allowance with
respect to these federal and state carryforwards.
    
 
   
<TABLE>
<S>                                                                              <C>
Deferred tax assets:
  Net operating loss carryforwards.............................................  $ 8,163,105
  Start-up and organizational costs capitalized for tax purposes...............    3,632,867
  Other........................................................................      192,230
                                                                                 -----------
Total deferred tax assets......................................................   11,988,202
 
Deferred tax liabilities:
  Tax over book depreciation...................................................      314,930
  Other........................................................................      467,169
                                                                                 -----------
Total deferred tax liability...................................................      782,099
                                                                                 -----------
Net future income tax benefit..................................................   11,206,103
Valuation allowance for net deferred tax assets................................  (11,206,103)
                                                                                 -----------
Net deferred tax assets........................................................  $   --
                                                                                 -----------
                                                                                 -----------
</TABLE>
    
 
    The reconciliation of the reported income tax expense to the amount that
would result by applying the U.S. federal statutory rate to net loss during the
development stage is as follows:
 
   
<TABLE>
<S>                                                                              <C>
Tax benefit at U.S. statutory rate.............................................  $(11,274,228)
Non-deductible expenses........................................................    1,075,630
State income taxes, net of federal benefit.....................................   (1,007,505)
Valuation allowance............................................................   11,206,103
                                                                                 -----------
Total..........................................................................  $   --
                                                                                 -----------
                                                                                 -----------
</TABLE>
    
 
   
16. OPERATING LEASES
    
 
   
    The Company conducts primarily all of its operations from leased facilities
under operating leases that have terms of up to five years and generally contain
renewal options of two to three years and rent escalation clauses. Future
minimum payments under noncancelable operating leases with initial terms of one
year or more consist of the following at December 31, 1998:
    
 
<TABLE>
<S>                                                               <C>
1999............................................................  $1,441,681
2000............................................................  1,402,328
2001............................................................    954,563
2002............................................................    684,799
2003............................................................    158,549
                                                                  ---------
                                                                  $4,641,920
                                                                  ---------
                                                                  ---------
</TABLE>
 
                                      F-18
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
16. OPERATING LEASES (CONTINUED)
    
    The Company incurred rent expense of $718,416 during the period from January
14, 1998 (date of inception) through December 31, 1998.
 
   
17. EMPLOYEE BENEFIT PLAN
    
 
   
    The Company established a defined contribution benefit plan effective July
1, 1998. The plan covers substantially all employees who have 30 days of service
with the Company. Participants may contribute from 1% to 15% of their annual
compensation to the plan. In addition, the Company may make discretionary
matching and profit-sharing contributions to the plan. No contributions were
made by the Company in 1998.
    
 
   
18. RELATED PARTY TRANSACTIONS
    
 
   
    During 1998, the Company received a non-interest bearing loan from an
officer in the amount of $1,000,000. The loan was subsequently converted into
1,667 shares of Series A Convertible Preferred Stock.
    
 
   
19. BUSINESS AND GEOGRAPHIC SEGMENT INFORMATION
    
 
   
    The Company is organized into two business units. The Company's IMAP
division provides an Internet-based network which enables clients to use leading
business software applications without the burden of owning or managing the
underlying technology. These services are delivered to customers through a
network of Enterprise Data Centers located in Maryland, California, Amsterdam
and Tokyo. The Professional IT Services division provides focused software
implementation services on a traditional time and materials basis.
    
 
   
    The Company evaluates the performance of its segments based primarily on
operating profit before depreciation, amortization and interest. The accounting
policies used by the reportable segments are the same as those used by the
Company as described in Note 1 to the consolidated financial statements.
    
 
    The Company's reportable segments are business units that offer distinct
services. The segments are managed separately as they have different customer
bases and delivery channels. The following table sets forth information on the
Company's reportable segments:
 
   
<TABLE>
<CAPTION>
                                                                           FOR THE PERIOD JANUARY 14, 1998
                                                                                 (INCEPTION) THROUGH
                                                                                  DECEMBER 31, 1998
                                                                    ----------------------------------------------
<S>                                                                 <C>             <C>             <C>
                                                                                     PROFESSIONAL
                                                                                          IT
                                                                       IMAP(SM)        SERVICES      CONSOLIDATED
                                                                    --------------  --------------  --------------
Revenues..........................................................  $       69,467   $  4,052,982   $    4,122,449
Segment operating (loss) profit...................................     (28,071,239)       342,387      (27,728,852)
Total assets......................................................     101,122,375      6,404,199      107,526,574
Capital expenditures..............................................      21,358,476         38,752       21,397,228
</TABLE>
    
 
                                      F-19
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
19. BUSINESS AND GEOGRAPHIC SEGMENT INFORMATION (CONTINUED)
    
   
    A reconciliation of segment operating loss for both segments to net loss
during the development stage is as follows:
    
 
   
<TABLE>
<S>                                                              <C>
Segment operating loss for all segments........................  $(27,728,852)
Depreciation and amortization..................................   (2,169,552)
Interest income................................................      367,411
Interest expense...............................................   (2,681,088)
                                                                 -----------
Net loss during the development stage..........................  $(32,212,081)
                                                                 -----------
                                                                 -----------
</TABLE>
    
 
   
    Revenues from foreign countries and assets located in foreign countries were
each less than $200,000.
    
 
   
20. PRO FORMA BALANCE SHEET (UNAUDITED)
    
 
   
    In January 1999 the Board of Directors approved the filing of a registration
statement for the sale of Common Stock with the Securities and Exchange
Commission that, upon closing, would meet the criteria for the automatic
conversion of the outstanding Series A Convertible Preferred Stock and Series B
Redeemable Convertible Preferred Stock into Common Stock. Additionally, the
mandatory repurchase rights of certain officers holding 10,750,000 shares of
Common Stock would terminate upon closing.
    
 
                                      F-20
<PAGE>
                            USINTERNETWORKING, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
   
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
                               DECEMBER 31, 1998
 
   
20. PRO FORMA BALANCE SHEET (UNAUDITED) (CONTINUED)
    
   
    The following table summarizes the components of the pro forma balance
sheet:
    
 
   
<TABLE>
<CAPTION>
                                                                                      ASSUMED
                                                                     HISTORICAL     CONVERSION
                                                                    DECEMBER 31,   OF SECURITIES       PRO
                                                                        1998         UPON IPO         FORMA
                                                                   --------------  -------------  --------------
<S>                                                                <C>             <C>            <C>
                             ASSETS
Current assets:
  Cash and cash equivalents......................................  $   43,802,465  $    --        $   43,802,465
  Other current assets...........................................       5,900,078       --             5,900,078
                                                                   --------------  -------------  --------------
Total current assets.............................................      49,702,543       --            49,702,543
Property and equipment, net......................................      21,640,145       --            21,640,145
Other noncurrent assets..........................................      36,183,886       --            36,183,886
                                                                   --------------  -------------  --------------
Total assets.....................................................  $  107,526,574       --        $  107,526,574
                                                                   --------------  -------------  --------------
                                                                   --------------  -------------  --------------
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable and accrued expenses..........................  $   11,294,477       --        $   11,294,477
  Other current liabilities......................................      14,139,517       --            14,139,517
                                                                   --------------  -------------  --------------
Total current liabilities........................................      25,433,994       --            25,433,994
Other noncurrent liabilities.....................................      17,162,052       --            17,162,052
Series B Preferred Stock.........................................      62,242,500    (62,242,500)       --
Common Stock subject to repurchase...............................       4,145,000       --             4,145,000
Stockholders' equity (deficit):
  Series A Preferred Stock.......................................             550           (550)       --
  Common Stock...................................................           5,000        247,196         252,196
  Additional paid-in capital.....................................      35,624,554     61,995,854      97,620,408
  Deficit accumulated during the development stage...............     (37,087,076)      --           (37,087,076)
                                                                   --------------  -------------  --------------
Total stockholders' equity (deficit).............................      (1,456,972)      --            60,785,528
                                                                   --------------  -------------  --------------
Total liabilities and stockholders' equity (deficit).............  $  107,526,574  $    --        $  107,526,574
                                                                   --------------  -------------  --------------
                                                                   --------------  -------------  --------------
</TABLE>
    
 
                                      F-21
<PAGE>
                          INDEPENDENT AUDITOR'S REPORT
 
The Board of Directors
Advanced Communication Resources, Inc.
 
   
    We have audited the accompanying balance sheets of Advanced Communication
Resources, Inc. as of December 31, 1997 and 1996, and the related statements of
operations, stockholders' equity and cash flows for the years then ended. These
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.
    
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits 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 financial statements referred to above present fairly,
in all material respects, the financial position of Advanced Communication
Resources, Inc. as of December 31, 1997 and 1996, and the results of its
operations and its cash flows for the years then ended, in conformity with
generally accepted accounting principles.
    
 
   
/s/ Mahoney Cohen & Company, CPA, P.C.
    
 
New York, New York
July 23, 1998, except for
Note 11, as to which the
date is October 2, 1998
 
                                      F-22
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                                 BALANCE SHEETS
 
                                ASSETS (NOTE 5)
 
   
<TABLE>
<CAPTION>
                                                                       DECEMBER 31,  DECEMBER 31,  SEPTEMBER 30,
                                                                           1996          1997          1998
                                                                       ------------  ------------  -------------
<S>                                                                    <C>           <C>           <C>
                                                                                                    (UNAUDITED)
Current assets:
  Cash...............................................................   $   34,204    $  179,982    $    28,317
  Accounts receivable, net of allowance for uncollectible accounts of
    $81,050 in 1996, $50,000 in 1997 and $100,000 as of September 30,
    1998 (Note 3)....................................................      817,803     1,559,330      1,550,942
  Other current assets...............................................       26,584        40,447         25,526
  Due from stockholders (Note 9).....................................       70,150        --             43,570
  Due from affiliate (Note 9)........................................      342,994        --            --
                                                                       ------------  ------------  -------------
      Total current assets...........................................    1,291,735     1,779,759      1,648,355
Property and equipment, net (Note 4).................................      144,190       110,857        180,026
Other assets.........................................................       20,360         6,788        167,278
                                                                       ------------  ------------  -------------
                                                                        $1,456,285    $1,897,404    $ 1,995,659
                                                                       ------------  ------------  -------------
                                                                       ------------  ------------  -------------
                              LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Notes payable (Note 5).............................................   $  725,000    $  525,000    $   400,000
  Accounts payable and accrued expenses..............................      366,372       435,998        462,914
  Deferred income taxes (Note 7).....................................       50,000       117,000        118,000
  Due to stockholders (Note 9).......................................       --           120,000        --
                                                                       ------------  ------------  -------------
      Total current liabilities......................................    1,141,372     1,197,998        980,914
Commitments and contingencies (Note 10)
Stockholders' equity (Note 6):
  Common stock.......................................................        1,500         1,500          1,500
  Additional paid-in capital.........................................       --            --            --
  Retained earnings..................................................      363,413       747,906      1,063,245
                                                                       ------------  ------------  -------------
                                                                           364,913       749,406      1,064,745
  Less: Treasury stock, at cost......................................       50,000        50,000         50,000
                                                                       ------------  ------------  -------------
      Total stockholders' equity.....................................      314,913       699,406      1,014,745
                                                                       ------------  ------------  -------------
                                                                        $1,456,285    $1,897,404    $ 1,995,659
                                                                       ------------  ------------  -------------
                                                                       ------------  ------------  -------------
</TABLE>
    
 
   
                            See accompanying notes.
    
 
                                      F-23
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                            STATEMENTS OF OPERATIONS
 
   
<TABLE>
<CAPTION>
                                                                         YEAR ENDED            NINE MONTHS ENDED
                                                                 ---------------------------  -------------------
                                                                 DECEMBER 31,   DECEMBER 31,     SEPTEMBER 30,
                                                                     1996           1997             1998
                                                                 -------------  ------------  -------------------
<S>                                                              <C>            <C>           <C>
                                                                                                  (UNAUDITED)
Net revenue (Note 3)...........................................  $   4,848,112   $6,646,245      $   5,416,982
Direct costs (Notes 6 and 9)...................................      3,768,134    4,230,576          3,536,404
                                                                 -------------  ------------  -------------------
Gross margin...................................................      1,079,978    2,415,669          1,880,578
Operating expenses (Note 9):
  Selling......................................................        545,251      377,783            371,511
  General and administrative...................................      1,395,758    1,574,654          1,152,228
                                                                 -------------  ------------  -------------------
    Total operating expenses...................................      1,941,009    1,952,437          1,523,739
                                                                 -------------  ------------  -------------------
 
Income (loss) before provision for (benefit from) income
  taxes........................................................       (861,031)     463,232            356,839
Provision for (benefit from) income taxes......................        (86,947)      78,739             41,500
                                                                 -------------  ------------  -------------------
Net income (loss)..............................................  $    (774,084)  $  384,493      $     315,339
                                                                 -------------  ------------  -------------------
                                                                 -------------  ------------  -------------------
</TABLE>
    
 
                            See accompanying notes.
 
                                      F-24
<PAGE>
   
                     ADVANCED COMMUNICATION RESOURCES, INC.
    
 
                       STATEMENTS OF STOCKHOLDERS' EQUITY
 
   
<TABLE>
<CAPTION>
                                                                   ADDITIONAL
                                                       COMMON        PAID-IN       RETAINED     TREASURY
                                                        STOCK        CAPITAL       EARNINGS      STOCK        TOTAL
                                                     -----------  -------------  ------------  ----------  ------------
<S>                                                  <C>          <C>            <C>           <C>         <C>
Balance, January 1, 1996...........................   $   1,500     $  --        $  1,137,497  $   --      $  1,138,997
Purchase of treasury stock (Note 6)................      --            --             --          (50,000)      (50,000)
Net loss...........................................      --            --            (774,084)     --          (774,084)
                                                     -----------        -----    ------------  ----------  ------------
Balance, December 31, 1996.........................       1,500                       363,413     (50,000)      314,913
Net income.........................................      --            --             384,493      --           384,493
                                                     -----------        -----    ------------  ----------  ------------
Balance, December 31, 1997.........................       1,500        --             747,906     (50,000)      699,406
Net income (Unaudited).............................                                   315,339      --           315,339
                                                     -----------        -----    ------------  ----------  ------------
Balance, September 30, 1998 (Unaudited)............   $   1,500     $  --        $  1,063,245  $  (50,000) $  1,014,745
                                                     -----------        -----    ------------  ----------  ------------
                                                     -----------        -----    ------------  ----------  ------------
</TABLE>
    
 
                            See accompanying notes.
 
                                      F-25
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                            STATEMENTS OF CASH FLOWS
 
   
<TABLE>
<CAPTION>
                                                                                                    NINE MONTHS
                                                                               YEAR ENDED              ENDED
                                                                       --------------------------  -------------
                                                                       DECEMBER 31,  DECEMBER 31,  SEPTEMBER 30,
                                                                           1996          1997          1998
                                                                       ------------  ------------  -------------
<S>                                                                    <C>           <C>           <C>
                                                                                                    (UNAUDITED)
Cash flows from operating activities:
  Net income (loss)..................................................   $ (774,084)   $  384,493    $   315,339
  Adjustments to reconcile net income (loss) to net cash provided by
    (used in) operating activities:
    Depreciation and amortization....................................      101,480        80,062        100,681
    Deferred income taxes............................................      (90,000)       67,000          1,000
    Change in assets and liabilities:
      Accounts receivable............................................      903,600      (741,527)         8,388
      Other current assets...........................................       (9,509)      (13,863)        14,921
      Accounts payable and accrued expenses..........................      (88,006)       69,626         26,916
                                                                       ------------  ------------  -------------
        Net cash provided by (used in) operating activities..........       43,481      (154,209)       467,245
                                                                       ------------  ------------  -------------
 
Cash flows from investing activities:
  Purchase of property and equipment.................................      (55,995)      (33,157)      (169,670)
  Payments for software development..................................       --            --           (160,490)
                                                                       ------------  ------------  -------------
        Cash used in investing activities............................      (55,995)      (33,157)      (330,160)
                                                                       ------------  ------------  -------------
 
Cash flows from financing activities:
  Proceeds from (repayments of) notes payable........................      225,000      (200,000)      (125,000)
  Proceeds from (repayments of) loans from stockholders..............       --           120,000       (120,000)
  Repayments of (advances to) loans to stockholders..................       88,850        70,150        (43,750)
  Repayments from (advances to) affiliates...........................     (288,668)      342,994        --
  Purchase of common stock for treasury..............................      (50,000)       --            --
                                                                       ------------  ------------  -------------
        Net cash provided by (used in) financing activities..........      (24,818)      333,144       (288,750)
                                                                       ------------  ------------  -------------
Net increase (decrease) in cash......................................      (37,332)      145,778       (151,665)
Cash, beginning of year..............................................       71,536        34,204        179,982
                                                                       ------------  ------------  -------------
Cash, end of year/period.............................................   $   34,204    $  179,982    $    28,317
                                                                       ------------  ------------  -------------
                                                                       ------------  ------------  -------------
 
                        Supplemental Disclosures of Cash Flow Information
 
Cash paid during the year/period for:
  Interest...........................................................   $   60,421    $    6,132    $    23,047
  Income taxes.......................................................   $   10,093    $   14,414    $    10,715
</TABLE>
    
 
                            See accompanying notes.
 
                                      F-26
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 IS
                                   UNAUDITED)
 
NOTE 1--THE COMPANY
 
    Advanced Communication Resources, Inc. (the "Company") provides computer
consulting services, including consultation on Year 2000 compliance matters, to
Fortune 500, financial services and other companies located in the New York
metropolitan area.
 
NOTE 2--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
INTERIM FINANCIAL INFORMATION
 
    The September 30, 1998 balance sheet, statements of operations, equity and
cash flows for the nine months then ended and certain information and footnote
disclosures related thereto are unaudited. In the opinion of management, all
adjustments, consisting only of normal recurring adjustments, necessary to
fairly present the financial position, results of operations and cash flows with
respect to the interim financial statements, have been included. The results of
operations for the nine months ended September 30, 1998 are not necessarily
indicative of result for the entire fiscal year.
 
USE OF ESTIMATES
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenue and expenses during the reporting
period. Actual results could differ from those estimates.
 
PROPERTY AND EQUIPMENT
 
    Property and equipment is recorded at cost. Machinery and equipment and
furniture and fixtures are depreciated by the straight-line method over
estimated useful lives ranging from three to five years. Leasehold improvements
are amortized over the shorter of the term of the lease or their estimated
useful life. Major additions and betterments are capitalized, and repairs and
maintenance are charged to operations in the period incurred.
 
INCOME TAXES
 
    The Company, with the consent of its stockholders, elected treatment as a
small business corporation under Subchapter S of the Internal Revenue Code and
the corresponding provisions of the New York State Franchise Tax law. Under the
aforementioned provisions, corporate income or loss and any tax credits earned
are included in the stockholders' individual income tax returns. The provision
for income taxes represents New York State Subchapter S and New York City
corporation taxes.
 
    The Company reports on a cash basis for income tax purposes. Deferred state
and local taxes are provided for the differences between the cash basis of
accounting and the accrual basis of accounting utilized in the preparation of
these financial statements. Pursuant to the cash method of accounting, revenue
is recorded when received, rather than when earned, and expenses are recorded
when paid, rather than when incurred.
 
                                      F-27
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 IS
                                   UNAUDITED)
 
NOTE 2--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
REVENUE RECOGNITION
 
    The Company recognizes revenue as professional services are performed. On
fixed fee engagements, which historically have not been material, revenue is
recognized as earned in accordance with the contract.
 
COMPUTER SOFTWARE COSTS
 
    Computer software costs of $207,997 at September 30, 1998 and $40,719 at
December 31, 1997 and 1996, included in other assets, are recorded at cost and
amortized by the straight-line method over three years. Amortization expense for
the nine months ended September 30, 1998 and the years ended December 31, 1997
and 1996 amounted to $6,788, $6,786 and $6,877, respectively. Accumulated
amortization amounted to $40,719, $33,931 and $26,359 at September 30, 1998,
December 31, 1997 and 1996, respectively.
 
ADVERTISING EXPENSES
 
    Advertising expenses amounting to approximately $7,600 and $20,500 for the
years ended December 31, 1997 and 1996, respectively, are charged to operations
during the period in which they are incurred.
 
NOTE 3--CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS
 
   
    The Company provides consulting services to companies in the financial
services industry, primarily located in the New York metropolitan area. In the
normal course of business, payment for the Company's services is due generally
within thirty days of invoicing. Management's credit evaluation process and the
reasonably short collection terms help mitigate any risks. At September 30,
1998, three customers comprised approximately 27% of the Company's outstanding
accounts receivable. These customers accounted for approximately 39% of net
revenue for the nine months ended September 30, 1998. At December 31, 1997, two
customers comprised approximately 40% of the Company's outstanding accounts
receivable. These customers accounted for approximately 30% of net revenue for
the year ended December 31, 1997. Additionally, three customers accounted for
approximately 50% of net revenue for the year ended December 31, 1996.
    
 
    The Company places its cash with financial institutions. Accounts are
insured by the Federal Deposit Insurance Corporation up to $100,000.
 
   
NOTE 4--PROPERTY AND EQUIPMENT
    
 
   
    Property and equipment is comprised of:
    
 
   
<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                                        ----------------------  SEPTEMBER 30,
                                                           1996        1997         1998
                                                        ----------  ----------  -------------
<S>                                                     <C>         <C>         <C>
Machinery and equipment...............................  $  247,047  $  280,204   $   354,037
Furniture and fixtures................................      45,042      45,042        65,528
Leasehold improvements................................      57,079      57,079        68,742
                                                        ----------  ----------  -------------
                                                           349,168     382,325       488,307
Less: Accumulated depreciation and amortization.......     204,978     271,468       308,281
                                                        ----------  ----------  -------------
                                                        $  144,190  $  110,857   $   180,026
                                                        ----------  ----------  -------------
                                                        ----------  ----------  -------------
</TABLE>
    
 
                                      F-28
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 IS
                                   UNAUDITED)
 
   
NOTE 5--NOTES PAYABLE
    
 
   
    Notes payable consists of:
    
 
   
<TABLE>
<CAPTION>
                                                                       DECEMBER 31,  DECEMBER 31,  SEPTEMBER 30,
                                                                           1996          1997          1998
                                                                       ------------  ------------  -------------
<S>                                                                    <C>           <C>           <C>
 
Bank credit facility providing for a $750,000 line of credit.
  Borrowings for advances under the line bear interest at 1% above
  the prime rate (9.5% at December 31, 1997). The line is
  collateralized by all of the assets of the Company and is
  personally guaranteed by the Company's stockholders................   $   --        $  400,000    $   400,000
 
Demand note payable to a commercial bank which bore interest at 1% in
  excess of the bank's prime lending rate (9.75% at December 31,
  1996); the note was collateralized by all of the assets of the
  Company and was personally guaranteed by the Company's
  stockholders.......................................................      500,000        --            --
 
Installment note payable to a former stockholder which bears interest
  at 75% of the prime lending rate of a commercial bank (6.37% at
  December 31, 1997). The note is collateralized by fifty shares of
  the Company's treasury stock held in escrow by the former
  stockholder and subordinated to the Company's bank debt. Principal
  payments in the amount of $25,000 are to be made quarterly through
  March 1, 1999 (A)..................................................      225,000       125,000        --
                                                                       ------------  ------------  -------------
 
                                                                        $  725,000    $  525,000    $   400,000
                                                                       ------------  ------------  -------------
                                                                       ------------  ------------  -------------
</TABLE>
    
 
- ------------------------
 
(A) The note contains provisions for minimum working capital, current ratio and
    stockholders' equity. The arrangement also limits compensation to the
    officers of the Company. At December 31, 1997 and 1996, the Company was in
    violation of certain financial covenants. Accordingly, the entire balance
    outstanding as of December 31, 1997 and 1996 has been classified as a
    current liability.
 
                                      F-29
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 IS
                                   UNAUDITED)
 
NOTE 6--STOCKHOLDERS' EQUITY
 
COMMON STOCK
 
<TABLE>
<CAPTION>
At September 30, 1998, December 31, 1997 and 1996,
  common stock consists of the following:
 
   Advanced Communication Resources, Inc., no par
                        value:
 
  Authorized--200 shares
<S>                                                   <C>            <C>            <C>
 
  Issued--150 shares
 
  Outstanding--100 shares...........................    $   1,500
                                                           ------
                                                           ------
</TABLE>
 
TREASURY STOCK
 
    On December 13, 1995, the Company entered into a stock purchase agreement to
purchase a stockholder's 33.3% common stock interest in the Company. The
purchase price for the stock was $50,000, paid upon execution of the purchase
agreement. The transaction was consummated during 1996.
 
    In connection with the stock purchase agreement, the Company entered into a
one year $350,000 consulting agreement with the former stockholder with $50,000
payable upon closing and $25,000 per quarter payable over three years. In
addition, the Company entered into a non-compete agreement with the stockholder
covering one year for which the former stockholder was paid $100,000. The
amounts related to the above agreements were charged to operations in 1996 and
are included in the accompanying statement of operations.
 
                                      F-30
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 IS
                                   UNAUDITED)
 
NOTE 7--INCOME TAXES
 
   
    The provision for (benefit from) state and local income taxes for the
periods ended consists of:
    
 
<TABLE>
<CAPTION>
                                                   DECEMBER 31,  DECEMBER 31,  SEPTEMBER 30,
                                                       1996          1997          1998
                                                   ------------  ------------  -------------
<S>                                                <C>           <C>           <C>
Current..........................................   $    3,053    $   11,739    $    40,500
Deferred.........................................      (90,000)       67,000          1,000
                                                   ------------  ------------  -------------
                                                    $  (86,947)   $   78,739    $    41,500
                                                   ------------  ------------  -------------
                                                   ------------  ------------  -------------
</TABLE>
 
    The Company's provision for local income taxes for the years ended December
31, 1997 and 1996 was determined under the alternative tax method.
 
   
    The Company's effective state and local tax rate for the nine months ended
September 30, 1998 and the years ended December 31, 1997 and 1996 was 11.6%, 17%
and 13.6%, respectively.
    
 
    Deferred state and local income taxes arise from the difference in the
amount of revenue and expenses reported on the accrual method of accounting for
financial statement reporting and the cash method of accounting for income tax
purposes.
 
NOTE 8--RETIREMENT PLAN
 
    The Company formed an IRS approved 401(k) plan during 1996, covering all
eligible full-time employees. Contributions to the plan are based upon a
matching contribution of 50% of employee contributions limited to 3% of salary.
For the nine months ended September 30, 1998 and years ended December 31, 1997
and 1996, 401(k) expense amounted to approximately $35,000, $45,000 and $47,000,
respectively.
 
NOTE 9--RELATED PARTY TRANSACTIONS
 
    CONSULTING SERVICES
 
    The Company subcontracts the consulting services of two companies affiliated
through common minority ownership interests. For the year ended December 31,
1997, fees incurred and paid to these companies amounted to $125,000. There were
no fees incurred during the year ended December 31, 1996.
 
    DUE FROM AFFILIATE
 
    During 1996, the Company made non-interest bearing advances to an affiliate.
These advances were repaid in full during 1997.
 
    The Company occupies office space leased by an affiliate without a rent
charge.
 
    DUE TO/FROM STOCKHOLDERS
 
    Advances to and from the Company's stockholders are non-interest bearing and
are due (payable) on demand.
 
                                      F-31
<PAGE>
                     ADVANCED COMMUNICATION RESOURCES, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 IS
                                   UNAUDITED)
 
NOTE 10--COMMITMENTS AND CONTINGENCIES
 
    LETTER OF CREDIT
 
    At December 31, 1997, the Company is contingently liable pursuant to a
letter of credit in the amount of $10,000 in favor of a trade organization's
legal defense fund. A certificate of deposit in the amount of $10,000
collateralizes the Company's obligation and is included in other current assets
in the accompanying balance sheets.
 
    EMPLOYEE AND CONTRACTOR AGREEMENTS
 
    The Company executes agreements with all technical employees and contractors
which contain certain provisions designed to protect the Company's intellectual
property. The agreements provide for an indefinite term, cancellable by either
party upon ten days written notice.
 
NOTE 11--SUBSEQUENT EVENTS
 
    CHANGE OF OWNERSHIP
 
    On October 2, 1998, the Company's stockholders sold all outstanding common
stock to USinternetworking, Inc.
 
    ASSIGNMENT OF LEASE
 
    On October 2, 1998, the Company assumed the lease obligation of an
affiliate. Future minimum lease payments, excluding escalation charges, are as
follows:
 
<TABLE>
<CAPTION>
YEAR ENDING
DECEMBER 31,
- ----------------------------------------------------------------------------------
<S>                                                                                 <C>
1998-Remainder....................................................................  $   29,000
1999..............................................................................     120,000
2000..............................................................................     124,000
2001..............................................................................     128,000
2002..............................................................................     131,000
Thereafter........................................................................      33,000
                                                                                    ----------
                                                                                    $  565,000
                                                                                    ----------
                                                                                    ----------
</TABLE>
 
                                      F-32
<PAGE>
               REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
Board of Directors and Stockholders of
International Information Technology, Inc. and
International Information Technology IIT, C.A.
 
    We have audited the accompanying combined balance sheets of International
Information Technology, Inc. and International Information Technology IIT, C.A.
as of December 31, 1997 and 1996, and the related combined statements of
operations, stockholders' equity, and cash flows for the years then ended. These
combined financial statements are the responsibility of the Companies'
management. Our responsibility is to express an opinion on these combined
financial statements based on our audits. We did not audit the financial
statements of International Information Technology IIT, C.A., a combined company
under common control, which statements reflect total assets of $76,361 and
$68,247 as of December 31, 1997 and 1996, respectively, and total revenues of
$147,797 and $3,336, for the year ended December 31, 1997 and for the period
from March 6, 1996 (inception) through December 31, 1996. Those statements were
audited by other auditors whose report has been furnished to us, and our
opinion, insofar as it relates to data included for International Information
Technology IIT, C.A., is based solely on the report of the other auditors.
 
    We conducted our audits in accordance with generally accepted auditing
standards. 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 statements presentation.
We believe that our audits and the report of other auditors provide a reasonable
basis for our opinion.
 
    In our opinion, based on our audits and the report of other auditors, the
combined financial statements referred to above present fairly, in all material
respects, the combined financial position of International Information
Technology, Inc. and International Information Technology IIT, C.A. as of
December 31, 1997 and 1996, and the results of their operations and their cash
flows for the years then ended in conformity with generally accepted accounting
principles.
 
   
                                              /s/ Ernst & Young LLP
    
 
Miami, Florida
September 23, 1998
 
                                      F-33
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
 
                 INTERNATIONAL INFORMATION TECHNOLOGY IIT, C.A.
 
                            COMBINED BALANCE SHEETS
   
<TABLE>
<CAPTION>
                                                                                  DECEMBER 31
                                                                             ----------------------
                                                                                1996        1997     JUNE 30, 1998
                                                                             ----------  ----------  -------------
<S>                                                                          <C>         <C>         <C>
                                                                                                      (UNAUDITED)
 
<CAPTION>
ASSETS
<S>                                                                          <C>         <C>         <C>
Current assets:
  Cash and cash equivalents................................................  $   69,563  $   14,443   $   219,739
  Accounts receivable--trade...............................................     225,500     634,215       883,723
  Other current assets.....................................................       2,451      13,902        44,046
                                                                             ----------  ----------  -------------
Total current assets.......................................................     297,514     662,560     1,147,508
 
Equipment and vehicles:
  Computer equipment.......................................................      30,407     116,850       160,180
  Vehicles.................................................................      45,119      45,119       --
                                                                             ----------  ----------  -------------
                                                                                 75,526     161,969       160,180
  Less: accumulated depreciation...........................................     (25,831)    (56,084)      (45,954)
                                                                             ----------  ----------  -------------
                                                                                 49,695     105,885       114,226
Deferred income taxes......................................................      --          --            31,285
Other assets...............................................................         654         618        33,472
                                                                             ----------  ----------  -------------
                                                                             ----------  ----------  -------------
Total assets...............................................................  $  347,863  $  769,063     1,326,491
                                                                             ----------  ----------  -------------
                                                                             ----------  ----------  -------------
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Bank overdraft...........................................................  $   --      $  157,056   $   --
  Accounts payable.........................................................      13,899       7,162         5,370
  Accrued expenses.........................................................      60,000     366,685       784,688
  Income taxes payable.....................................................      --          18,124       191,664
  Current portion of note payable..........................................       4,443      10,036       --
  Current portion of capital lease obligations.............................      --          18,230        11,994
  Unsecured demand note payable to stockholder, non-interest bearing.......      99,951      62,160        54,384
  Client advances..........................................................      55,824      --           --
  Current deferred income taxes............................................      49,270      93,166        50,235
                                                                             ----------  ----------  -------------
Total current liabilities..................................................     283,387     732,619     1,048,100
 
Note payable...............................................................      10,676      --           --
Capital lease obligations, net of current portion..........................      --          15,953        11,031
Deferred income taxes......................................................       9,103       9,570
 
Commitments and contingent liabilities
 
Stockholders' equity:
  Common stock.............................................................       2,724       2,724         2,724
  Cumulative translation adjustment........................................         835     (20,918)       22,716
  Retained earnings........................................................      41,138      29,115       241,920
                                                                             ----------  ----------  -------------
                                                                                 44,697      10,921       267,360
                                                                             ----------  ----------  -------------
                                                                             ----------  ----------  -------------
Total liabilities and stockholders' equity.................................  $  347,863  $  769,063     1,326,491
                                                                             ----------  ----------  -------------
                                                                             ----------  ----------  -------------
</TABLE>
    
 
SEE ACCOMPANYING NOTES.
 
                                      F-34
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
 
                 INTERNATIONAL INFORMATION TECHNOLOGY IIT, C.A.
 
                       COMBINED STATEMENTS OF OPERATIONS
 
   
<TABLE>
<CAPTION>
                                                                           YEAR ENDED DECEMBER 31     SIX MONTHS
                                                                         --------------------------      ENDED
                                                                             1996          1997      JUNE 30, 1998
                                                                         ------------  ------------  -------------
<S>                                                                      <C>           <C>           <C>
                                                                                                      (UNAUDITED)
Consulting revenue.....................................................  $    747,023  $  2,812,011   $ 3,073,248
Cost of revenue........................................................       519,261     1,881,031     1,366,799
                                                                         ------------  ------------  -------------
Gross profit...........................................................       227,762       930,980     1,706,449
 
Operating expenses:
  General and administrative...........................................       131,037       778,342     1,403,074
  Sales and marketing..................................................        73,305        62,943         8,449
  Depreciation.........................................................        13,556        30,253        17,979
                                                                         ------------  ------------  -------------
                                                                              217,898       871,538     1,429,502
                                                                         ------------  ------------  -------------
Income from operations.................................................         9,864        59,442       276,947
Interest expense.......................................................        (2,917)       (8,977)      (13,623)
                                                                         ------------  ------------  -------------
Income before provision for income taxes...............................         6,947        50,465       263,324
Provision for income taxes.............................................        14,832        62,488        50,519
                                                                         ------------  ------------  -------------
Net (loss) income......................................................  $     (7,885) $    (12,023)      212,805
                                                                         ------------  ------------  -------------
                                                                         ------------  ------------  -------------
</TABLE>
    
 
    SEE ACCOMPANYING NOTES.
 
                                      F-35
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
                 INTERNATIONAL INFORMATION TECHNOLOGY IIT, C.A.
 
                   COMBINED STATEMENT OF STOCKHOLDERS' EQUITY
 
   
<TABLE>
<CAPTION>
                                                         INTERNATIONAL
                                                          INFORMATION            INTERNATIONAL INFORMATION
                                                     TECHNOLOGY, INC. (1)        TECHNOLOGY IIT, C.A. (2)
                                                     ---------------------  -----------------------------------
<S>                                                  <C>        <C>         <C>        <C>          <C>          <C>
                                                      COMMON     RETAINED    COMMON    CUMULATIVE    RETAINED
                                                       STOCK     EARNINGS     STOCK    ADJUSTMENT    EARNINGS      TOTAL
                                                     ---------  ----------  ---------  -----------  -----------  ----------
Balances at January 1, 1996........................  $   1,000  $   49,023  $           $           $            $   50,023
  Net income (loss)................................                 22,304                              (30,189)     (7,885)
  Issuance of common stock.........................                             1,724                                 1,724
  Translation adjustment...........................                                           835                       835
                                                     ---------  ----------  ---------  -----------  -----------  ----------
Balances at December 31, 1996......................      1,000      71,327      1,724         835       (30,189)     44,697
  Net income (loss)................................                 91,010                             (103,033)    (12,023)
  Translation adjustment...........................                                       (21,753)                  (21,753)
                                                     ---------  ----------  ---------  -----------  -----------  ----------
Balances at December 31, 1997......................  $   1,000  $  162,337  $   1,724   $ (20,918)  $  (133,222) $   10,921
                                                     ---------  ----------  ---------  -----------  -----------  ----------
                                                     ---------  ----------  ---------  -----------  -----------  ----------
  Net income.......................................                 90,491                              122,314     212,805
  Translation adjustment...........................                                        43,634                    43,634
                                                     ---------  ----------  ---------  -----------  -----------  ----------
Balances at June 30, 1998..........................  $   1,000  $  252,828  $   1,724   $  22,716   $   (10,908) $  267,360
                                                     ---------  ----------  ---------  -----------  -----------  ----------
                                                     ---------  ----------  ---------  -----------  -----------  ----------
</TABLE>
    
 
- ------------------------
 
(1) $1 par value common stock, 1,000 shares authorized, issued and outstanding.
 
(2) No par value common stock, 500 shares authorized, issued and outstanding.
 
SEE ACCOMPANYING NOTES.
 
                                      F-36
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
                 INTERNATIONAL INFORMATION TECHNOLOGY IIT, C.A.
 
                        COMBINED STATEMENT OF CASH FLOWS
 
   
<TABLE>
<CAPTION>
                                                                                  YEARS ENDED
                                                                                  DECEMBER 31         SIX MONTHS
                                                                             ----------------------      ENDED
                                                                                1996        1997     JUNE 30, 1998
                                                                             ----------  ----------  -------------
<S>                                                                          <C>         <C>         <C>
                                                                                                      (UNAUDITED)
OPERATING ACTIVITIES
Net loss...................................................................  $   (7,885) $  (12,023)  $   212,805
Adjustments to reconcile net loss to net cash (used in) provided by
  operating activities:
  Depreciation.............................................................      13,556      30,253        17,789
  Deferred taxes...........................................................      14,832      44,364      (134,021)
  Change in assets and liabilities:
    Accounts receivable....................................................     (72,937)   (408,715)     (249,508)
    Other current assets...................................................      (1,655)    (11,415)      (30,144)
    Other assets...........................................................      --          --           (32,854)
    Accounts payable.......................................................      13,899      (6,737)       (1,792)
    Accrued expenses.......................................................      59,200     306,685       418,003
    Income taxes payable...................................................      --          18,124       173,540
    Client advances........................................................      55,824     (55,824)      --
                                                                             ----------  ----------  -------------
Net cash provided by (used in) operating activities........................      74,834     (95,288)      373,818
 
INVESTING ACTIVITIES
Issuance of common stock...................................................       1,724      --
Acquisition of equipment and vehicle.......................................     (19,154)    (63,532)
Sale of vehicle............................................................      --          --            17,504
                                                                             ----------  ----------  -------------
Net cash (used in) investing activities....................................     (17,430)    (63,532)       17,504
 
FINANCING ACTIVITIES
(Repayments) proceeds from note payable to stockholder.....................      68,890     (37,791)       (7,776)
Bank overdraft.............................................................     (50,733)    157,056      (157,056)
Repayments of note payable.................................................      (5,998)     (5,083)      (10,036)
Repayments of capital leases...............................................      --         (10,482)      (11,158)
                                                                             ----------  ----------  -------------
Net cash provided by financing activities..................................      12,159     103,700      (186,026)
                                                                             ----------  ----------  -------------
Net increase (decrease) in cash and cash equivalents.......................      69,563     (55,120)      205,296
Cash and cash equivalents at beginning of year.............................      --          69,563        14,443
                                                                             ----------  ----------  -------------
Cash and cash equivalents at end of year...................................  $   69,563  $   14,443   $   219,739
                                                                             ----------  ----------  -------------
                                                                             ----------  ----------  -------------
 
SUPPLEMENTAL INFORMATION
Interest paid..............................................................  $    2,917  $    8,977   $    13,623
                                                                             ----------  ----------  -------------
                                                                             ----------  ----------  -------------
 
SCHEDULE OF NONCASH INVESTING ACTIVITIES
Property and equipment acquired under capital leases.......................  $   --      $   44,465   $   --
                                                                             ----------  ----------  -------------
                                                                             ----------  ----------  -------------
</TABLE>
    
 
SEE ACCOMPANYING NOTES.
 
                                      F-37
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
                 INTERNATIONAL INFORMATION TECHNOLOGY IIT, C.A.
 
                   NOTES TO THE COMBINED FINANCIAL STATEMENTS
 
   SIX MONTHS ENDED JUNE 30, 1998 AND YEARS ENDED DECEMBER 31, 1997 AND 1996
 
  (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1998 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
PRINCIPLES OF COMBINATION AND BASIS OF PREPARATION
 
    The combined financial statements include the accounts of International
Information Technology, Inc. (the Company) and International Information
Technology IIT, C.A. (the Foreign Affiliate) (collectively referred to as "the
Companies") which are affiliated through common ownership and management.
 
    International Information Technology, Inc. provides internet consulting,
integration, and support services principally to commercial companies located
throughout the United States. The Company was incorporated, under the laws of
the State of California, in May 1994.
 
    International Information Technology IIT, C.A. provides internet consulting,
integration, and support services principally to commercial companies located
throughout Venezuela. The Foreign Affiliate was incorporated under the laws of
Venezuela, on March 5, 1996 (inception).
 
    All significant intercompany transactions have been eliminated in
preparation of the combined financial statements.
 
   
INTERIM FINANCIAL INFORMATION
    
 
   
    The June 30, 1998 balance sheet, statements of operations, equity and cash
flows for the six months then ended and certain information and footnote
disclosures related thereto are unaudited. In the opinion of management, all
adjustments, consisting only of normal recurring adjustments, necessary to
fairly present the financial position, results of operations and cash flows with
respect to the interim financial statements, have been included. The results of
operations for the six months ended June 30, 1998 are not necessarily indicative
of result for the entire fiscal year.
    
 
CONVERSION FOR U.S. DOLLARS
 
    The financial information from the Foreign Affiliate includes financial
information converted from Venezuelan Bolivares to U.S. Dollars. A summary of
the conversion method used to convert the financial statements to U.S. Dollars
is as follows:
 
    - monetary assets and liabilities were converted at the rate in effect at
      the balance sheet date.
 
    - non-monetary assets and liabilities were converted at their historical
      rates.
 
    - the statement of operations was converted at the average rate during the
      periods.
 
USE OF ESTIMATES
 
    The preparation of the combined financial statements in conformity with
generally accepted accounting principles, requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements, and the reported amount of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
                                      F-38
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
                 INTERNATIONAL INFORMATIONAL TECHNOLOGY IIT, CA
 
                   NOTES TO THE COMBINED FINANCIAL STATEMENTS
 
   SIX MONTHS ENDED JUNE 30, 1998 AND YEARS ENDED DECEMBER 31, 1997 AND 1996
 
  (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1998 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
 
CASH AND CASH EQUIVALENTS
 
    For purposes of the statement of cash flows, the Companies consider all
highly liquid instruments, including certificates of deposit, purchased with a
maturity of three months or less to be cash equivalents.
 
EQUIPMENT AND VEHICLES
 
    Equipment and vehicle are stated at cost. Depreciation is calculated on a
straight-line basis over the assets' estimated useful lives which range from
three to five years.
 
CONCENTRATION OF CREDIT RISK
 
    Financial instruments that subject the Companies to concentrations of credit
risks consist primarily of accounts receivable. The Companies grant credit in
the normal course of business to their clients. As part of this ongoing
procedure, the Companies monitor the creditworthiness of their clients. The
Companies do not believe that they are subject to any unusual credit risk beyond
the normal credit risk inherent in their business.
 
   
    For the six months ended June 30, 1998, two customers accounted for 27%, and
11% of total revenue, and two customers accounted for 32%, and 19% of accounts
receivable at June 30, 1998.
    
 
    For the year ended December 31, 1997, three clients accounted for 33%, 17%,
and 11% of total revenues, and three clients accounted for 44%, 16%, and 11% of
accounts receivable at December 31, 1997. For the year ended December 31, 1996,
three clients accounted for 57%, 29%, and 11% of total revenues, and three
clients accounted for 42%, 24%, and 11% of accounts receivable at December 31,
1996.
 
REVENUE RECOGNITION
 
    Revenue is recognized in the period the services are performed.
 
ADVERTISING COSTS
 
    The Companies expense advertising costs as incurred. Advertising expense was
approximately $73,000 and $30,000 in 1997 and 1996, respectively. Advertising
expense was approximately $8,000 for the six months ended June 30, 1998.
 
NEW ACCOUNTING PRONOUNCEMENTS
 
    In 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 130, "Reporting Comprehensive Income" (SFAS
No. 130). SFAS No. 130 establishes standards for reporting and displaying
comprehensive income. SFAS No. 130 only impacts display as opposed to actual
amounts recorded. Other comprehensive income includes all non-owner changes in
equity that are excluded from net income, such as foreign currency translation
adjustments. SFAS No. 130 is required to be adopted in 1998.
 
                                      F-39
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
                 INTERNATIONAL INFORMATIONAL TECHNOLOGY IIT, CA
 
             NOTES TO THE COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
   SIX MONTHS ENDED JUNE 30, 1998 AND YEARS ENDED DECEMBER 31, 1997 AND 1996
 
  (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1998 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED) (CONTINUED)
    In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 131, "Disclosures about Segments of an
Enterprise and Related Information" (SFAS No. 131). This Statement requires that
public business enterprises report certain information about operating segments
in complete sets of financial statements of the enterprise and in condensed
financial statements of interim periods issued to shareholders. It also requires
that public business enterprises report certain information about their product
and services, the geographic areas in which they operate, and their major
customers. Upon adoption of this pronouncement, additional disclosures will be
required by the Company. This statement is effective for fiscal years beginning
after December 15, 1997. Earlier application is encouraged. The impact of the
adoption of SFAS No. 131 in 1998 has not been determined.
 
2. LEASES
 
   
    The Companies entered into various capital leases for computer equipment
during 1997. Computer equipment under capital lease obligations were acquired
for approximately $44,000. Depreciation expense for the six months ended June
30, 1998 was $7,411 and for the year ended December 31, 1997 was $6,000.
    
 
    Future lease payments under capital and operating leases are summarized as
follows:
 
<TABLE>
<CAPTION>
                                                                 CAPITAL
                                                                 LEASES      OPERATING LEASES
                                                              -------------  ----------------
<S>                                                           <C>            <C>
1998........................................................    $  25,118       $   31,936
1999........................................................       13,503            3,111
2000........................................................        5,844            2,592
                                                              -------------        -------
  Total minimum lease payments..............................       44,465       $   37,639
                                                                                   -------
                                                                                   -------
Less amounts representing interest..........................       10,282
                                                              -------------
Present value of minimum lease payments (including current
  portion of $18,230).......................................    $  34,183
                                                              -------------
                                                              -------------
</TABLE>
 
Rent expense was $17,000, $32,000 and $17,000 for the six months ended June 30,
1998 and for the year ended December 31, 1997 and 1996, respectively.
 
Capital leases have effective interest rates which range primarily from 6% to
25%.
 
                                      F-40
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
                 INTERNATIONAL INFORMATIONAL TECHNOLOGY IIT, CA
 
             NOTES TO THE COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
   SIX MONTHS ENDED JUNE 30, 1998 AND YEARS ENDED DECEMBER 31, 1997 AND 1996
 
  (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1998 IS UNAUDITED)
 
3. ACCRUED EXPENSES
 
    Accrued expenses are comprised of the following
 
   
<TABLE>
<CAPTION>
                                                              DECEMBER 31,
                                                         ----------------------    JUNE 30,
                                                            1996        1997         1998
                                                         ----------  ----------  -------------
<S>                                                      <C>         <C>         <C>
Accrued bonuses, payroll and payroll taxes.............  $   60,000  $  287,120   $   586,596
Accrued consulting.....................................      --          67,965        63,744
Accrued expenses.......................................      --          11,600       134,348
                                                         ----------  ----------  -------------
  Total accrued expenses...............................  $   60,000  $  366,685   $   784,688
                                                         ----------  ----------  -------------
                                                         ----------  ----------  -------------
</TABLE>
    
 
4. EMPLOYEE BENEFIT PLAN
 
    The Company has established a defined contribution benefit plan effective
January 1, 1998. The plan covers substantially all employees of the Company who
are 21 years of age or older. Participants may contribute up to 15% of their
annual compensation to the plan, and the Company matches up to 3% of annual
compensation.
 
5. NOTE PAYABLE
 
    The note payable is due to a financing organization, and requires monthly
installments of $552, including interest at 9.90%. The note is secured by a
vehicle and is personally guaranteed by a stockholder.
 
6. INCOME TAXES
 
    Deferred income tax assets and liabilities are determined based upon
differences between financial reporting and the tax basis of assets and
liabilities and are measured using the enacted tax rate and laws that will be in
effect when the differences are expected to reverse.
 
    The components of the income tax provision are as follows:
 
   
<TABLE>
<CAPTION>
                                                     YEARS ENDED DECEMBER
                                                              31            SIX MONTHS
                                                     --------------------      ENDED
                                                       1996       1997     JUNE 30, 1998
                                                     ---------  ---------  -------------
<S>                                                  <C>        <C>        <C>
Current............................................  $  --      $  18,124   $   184,540
Deferred...........................................     14,832     44,364      (134,021)
                                                     ---------  ---------  -------------
  Total............................................  $  14,832  $  62,488   $    50,519
                                                     ---------  ---------  -------------
                                                     ---------  ---------  -------------
</TABLE>
    
 
                                      F-41
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
                 INTERNATIONAL INFORMATIONAL TECHNOLOGY IIT, CA
 
             NOTES TO THE COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
   SIX MONTHS ENDED JUNE 30, 1998 AND YEARS ENDED DECEMBER 31, 1997 AND 1996
 
  (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1998 IS UNAUDITED)
 
6. INCOME TAXES (CONTINUED)
    Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amount of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Significant components of
the Companies' net deferred income taxes are as follows:
 
<TABLE>
<CAPTION>
                                                  YEARS ENDED DECEMBER 31
                                                  -----------------------
<S>                                               <C>         <C>          <C>
                                                     1996        1997
                                                  ----------  -----------
Deferred tax assets:
  Payroll accrual...............................  $   23,964  $    71,734
  Bonus accrual.................................      --           30,934
  Other accruals................................       5,239       40,537
  Contributions.................................          40      --
  Net operating loss carryforward...............      11,871      --
                                                  ----------  -----------
                                                      41,114      143,205
Deferred tax liabilities
  Depreciation..................................      (9,103)      (9,570)
  State tax.....................................        (319)        (627)
  Accounts receivable...........................     (90,065)    (235,744)
                                                  ----------  -----------
                                                     (99,487)    (245,941)
                                                  ----------  -----------
    Total net deferred tax......................  $  (58,373) $  (102,736)
                                                  ----------  -----------
                                                  ----------  -----------
</TABLE>
 
    A valuation allowance is required to reduce the deferred tax assets reported
if, based on the weight of the evidence, it is more likely than not that some
portion or all of the deferred tax assets will not be realized. After
consideration of all the evidence, both positive and negative, management has
determined that no valuation allowance at December 31, 1997 is necessary to
reduce the deferred tax assets related to the U.S. operations to the amount that
will more likely than not be realized.
 
    The Foreign Affiliate has experienced net operating losses in the amount of
$82,000 and $28,000 for the year ended December 31, 1997 and for the period from
March 6, 1996 (inception) through December 31, 1996, respectively. These net
operating losses result in deferred tax assets of approximately $23,000 at
December 31, 1997 and $5,000 at December 31, 1996. Net operating losses of
$28,000 will expire in 1999 and $82,000 will expire in 2000. Management has
determined that it is more likely than not that these net operating losses will
not be utilized, and therefore has determined that a full valuation allowance of
$23,000 and $5,000 is needed at December 31, 1997 and December 31,1996,
respectively.
 
7. GEOGRAPHIC SEGMENT INFORMATION
 
    The Companies are engaged in one business segment. This segment includes
providing internet consulting, integration, and support services principally to
commercial companies located throughout the United States and South America. The
following table presents information regarding geographic segments for 1997 and
1996. There were no service transfers between the United States and South
America.
 
                                      F-42
<PAGE>
                 INTERNATIONAL INFORMATION TECHNOLOGY, INC. AND
                 INTERNATIONAL INFORMATIONAL TECHNOLOGY IIT, CA
 
             NOTES TO THE COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
   SIX MONTHS ENDED JUNE 30, 1998 AND YEARS ENDED DECEMBER 31, 1997 AND 1996
 
  (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1998 IS UNAUDITED)
 
7. GEOGRAPHIC SEGMENT INFORMATION (CONTINUED)
Operating profit is total service revenue less cost of service revenue, general
and administrative expenses, sales and marketing and depreciation.
 
   
<TABLE>
<CAPTION>
                                                                             UNITED
                                                                             STATES     SOUTH AMERICA     TOTAL
                                                                          ------------  -------------  ------------
<S>                                                            <C>        <C>           <C>            <C>
Consulting revenue:
                                                                    1997   $2,664,214    $   147,797   $  2,812,011
                                                                    1996      743,687          3,336        747,023
Depreciation:
                                                                    1997   $   26,919    $     3,334   $     30,253
                                                                    1996       12,720            836         13,556
Operating profit:
                                                                    1997   $  158,280    $   (98,838)  $     59,442
                                                                    1996       39,481        (29,617)         9,864
Other expense:
                                                                    1997   $   (4,782)        (4,195)  $     (8,977)
                                                                    1996   $   (2,345)          (572)  $     (2,917)
Identifiable assets:
                                                                    1997   $  692,702    $    76,361   $    769,063
                                                                    1996      279,616         68,247        347,863
</TABLE>
    
 
8. IMPACT OF YEAR 2000 (UNAUDITED)
 
    Some older computer programs were written using two digits rather than four
to define the applicable year. As a result, those computer programs have
time-sensitive software that recognize a date using "00" as the year 1900 rather
than the year 2000. This could cause a system failure or miscalculations causing
disruptions of operations, including, among other things, a temporary inability
to process transactions, send invoices, or engage in similar normal business
activities.
 
    The Companies are assessing the modifications or replacement of its software
that may be necessary for its computer systems to function properly with respect
to the dates in the year 2000 and thereafter. The Companies do not believe that
the cost of either modifying existing software or converting to new software
will be significant or that the year 2000 issue will pose significant
operational problems for its computer systems.
 
9. SUBSEQUENT EVENTS
 
    On February 25, 1998, the stockholders, together with other Company
management, formed I.I.T. Holding, Inc. The stockholders contributed 100% of the
common stock of the Companies for 52% of I.I.T. Holding.
 
    On August 28, 1998, the stockholders of I.I.T. Holding entered into an
agreement to exchange 100% of their outstanding shares in I.I.T. Holding for
cash and warrants of the acquiring entity on September 8, 1998.
 
                                      F-43
<PAGE>
            UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
 
   
    The following Unaudited Pro Forma Consolidated Statement of Operations is
based on the historical consolidated financial statements of USI and the
historical financial statements of ACR and IIT during the periods presented,
adjusted to give effect to those acquisitions.
    
 
    The Unaudited Pro Forma Consolidated Statement of Operations for the year
ended December 31, 1998 gives effect to the acquisitions as if they had occurred
as of January 1, 1998. The pro forma adjustments are described in the
accompanying notes and are based upon available information and certain
assumptions that management believes are reasonable.
 
   
    The Unaudited Pro Forma Consolidated Statement of Operations does not
purport to represent what USI's results of operations would actually have been
had the acquisitions in fact occurred on such dates or to project USI's results
of operations for any future date or period. The Unaudited Pro Forma
Consolidated Statement of Operations should be read in conjunction with the
consolidated financial statements of USI, ACR and IIT, and the related notes
thereto, included elsewhere in this Prospectus and "Management's Discussion and
Analysis of Financial Condition and Results of Operations."
    
 
    IIT was purchased in September 1998 and ACR was purchased in October 1998
and have been accounted for under the purchase method of accounting. The total
purchase price for each of the acquisitions has been allocated to the
identifiable tangible and intangible assets and liabilities of the applicable
acquired business based upon their fair values with the remainder allocated to
goodwill.
 
                                      P-1
<PAGE>
                            USINTERNETWORKING, INC.
            UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
                 FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998
                 (AMOUNTS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                              HISTORICAL      PRO FORMA      PRO FORMA
                                              USI(1)       ACR        IIT        TOTAL     ADJUSTMENTS(2)   CONSOLIDATED
                                             ---------  ---------  ---------  -----------  ---------------  ------------
<S>                                          <C>        <C>        <C>        <C>          <C>              <C>
Revenues...................................  $     119  $   7,489  $   6,900     $14,508      $    (570)(a)     $13,938
                                             ---------  ---------  ---------  -----------  ---------------  ------------
Expenses:
  Cost of sales and services...............      4,158      4,868      3,470      12,496         --              12,496
  Selling, general and administrative
    expenses...............................     26,466      2,172      2,610      31,248          2,122(b)       33,370
                                             ---------  ---------  ---------  -----------  ---------------  ------------
  Operating income (loss)..................    (30,505)       449        820     (29,236)        (2,692)        (31,928)
  Interest expense.........................      2,675         24          6       2,705         --               2,705
  Interest income..........................       (365)    --         --            (365)        --                (365)
                                             ---------  ---------  ---------  -----------  ---------------  ------------
Income (loss) before income taxes..........    (32,815)       425        814     (31,576)        (2,692)        (34,268)
Provision (benefit) for income taxes.......     --             14        116         130           (130)(c)      --
                                             ---------  ---------  ---------  -----------  ---------------  ------------
Net (loss) income..........................  $ (32,815) $     411  $     698   $ (31,706)     $  (2,562)     $  (34,268)
                                             ---------  ---------  ---------  -----------  ---------------  ------------
                                             ---------  ---------  ---------  -----------  ---------------  ------------
Basic and diluted loss per common share
  attributable to common stockholders
  (3)......................................                                                                  $    (0.46)
                                                                                                            ------------
</TABLE>
    
 
- ------------------------
 
(1) For the period from inception, January 14, 1998, to December 31, 1998.
 
(2) Pro forma adjustments to the unaudited consolidated statement of operations
    for the twelve months ended December 31, 1998 are made to reflect the
    following:
 
    (a) To record the elimination of intercompany revenue.
 
    (b) To record amortization of goodwill related to the acquisitions over the
       estimated useful life of 15 years as well as the elimination of
       intercompany expenses.
 
   
    (c) USI, after considering the pro forma effects of the acquisitions, has a
       pro forma net loss of $34,268. The tax benefits of such loss are offset
       by a valuation allowance based on uncertainties surrounding the
       realization of the income tax benefit.
    
 
   
(3) Assumes conversion of all Series A and Series B preferred stock, in
    connection with the offering. See Note 3 to USI's Consolidated Financial
    Statements.
    
 
                                      P-2
<PAGE>
                                     [LOGO]
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
    The following table sets forth the various expenses, all of which will be
borne by the Registrant, in connection with the sale and distribution of the
securities being registered, other than the underwriting discounts and
commissions. All amounts shown are estimates except for the Securities and
Exchange Commission registration fee, the NASD filing fee and the Nasdaq
National Market Listing Fee.
 
<TABLE>
<S>                                                                         <C>
SEC Registration Fee......................................................  $  23,978
NASD Filing Fee...........................................................      9,125
Nasdaq National Market Listing Fee........................................      *
Transfer Agent Fees.......................................................      *
Accounting Fees and Expenses..............................................      *
Legal Fees and Expenses...................................................      *
Printing and Mailing Expenses.............................................      *
Miscellaneous.............................................................      *
                                                                            ---------
    Total.................................................................  $   *
</TABLE>
 
- ------------------------
 
*   To be supplied by amendment.
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    Section 145 of the General Corporation Law of the State of Delaware
("Section 145") permits a Delaware corporation to indemnify any person who was
or is a party or is threatened to be made a party to any threatened, pending, or
completed action, suit, or proceeding, whether civil, criminal, administrative,
or investigative (other than an action by or in the right of the corporation) by
reason of the fact that such person is or was a director, officer, employee, or
agent of the corporation, or is or was serving at the request of the corporation
as a director, officer, employee, or agent of another corporation, partnership,
joint venture, trust, or other enterprise, against expenses (including
attorneys' fees), judgments, fines, and amounts paid in settlement actually and
reasonably incurred by such person in connection with such action, suit, or
proceeding if such person acted in good faith and in a manner such person
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe such person's conduct was unlawful.
 
    In the case of an action by or in the right of the corporation, Section 145
permits the corporation to indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending, or completed action or
suit by or in the right of the corporation to procure a judgment in its favor by
reason of the fact that such person is or was a director, officer, employee or
agent of the corporation, or is or was serving at the request of the corporation
as a director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise against expenses (including attorneys'
fees) actually and reasonably incurred by such person in connection with the
defense or settlement of such action or suit if he acted in good faith and in a
manner such person reasonably believed to be in or not opposed to the best
interest of the corporation. No indemnification may be made in respect of any
claim, issue, or matter as to which such person shall have been adjudged to be
liable to the corporation unless and only to the extent that the Court of
Chancery or the court in which such action or suit was brought shall determine
upon application that, despite the adjudication of liability but in view of all
the circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses which the Court of Chancery or such other court
shall deem proper.
 
    To the extent that a present or former director or officer of a corporation
has been successful on the merits or otherwise in defense of any action, suit or
proceeding referred to in the preceding two
 
                                      II-1
<PAGE>
paragraphs, Section 145 requires that such person be indemnified against
expenses (including attorneys' fees) actually and reasonably incurred by such
person in connection therewith.
 
    Section 145 provides that expenses (including attorneys' fees) incurred by
an officer or director in defending any civil, criminal, administrative, or
investigative action, suit or proceeding may be paid by the corporation in
advance of the final disposition of such action, suit or proceeding upon receipt
of an undertaking by or on behalf of such director or officer to repay such
amount if it shall ultimately be determined that such person is not entitled to
be indemnified by the corporation as authorized in Section 145.
 
    Our Certificate provides that one of our officers or directors will not be
personally liable to us or our stockholders for monetary damages for any breach
of his fiduciary duty as an officer or director, except in certain cases where
liability is mandated by the DGCL. The provision has no effect on any
non-monetary remedies that may be available to us or our stockholders, nor does
it relieve us or our officers or directors from compliance with federal or state
securities laws. The Certificate also generally provides that we will indemnify,
to the fullest extent permitted by law, any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action,
suit, investigation, administrative hearing or any other proceeding (each, a
"Proceeding") by reason of the fact that he is or was our director or officer,
or is or was serving at our request as a director, officer, employee or agent of
another entity, against expenses incurred by him in connection with such
Proceeding. An officer or director shall not be entitled to indemnification from
us if (i) the officer or director did not act in good faith and in a manner
reasonably believed to be in, or not opposed to, our best interests, or (ii)
with respect to any criminal action or proceeding, the officer or director had
reasonable cause to believe his conduct was unlawful.
 
    Our Bylaws provide that we will indemnify any person who is made a party to
any threatened, pending or completed action, suit or proceeding by reason of the
fact that he or she is or was our director or officer, and may indemnify any of
our employees or agents in those circumstances, against expenses, including
attorneys' fees, judgments, fines and amounts paid in settlement actually and
reasonably incurred by him or her in connection with such action, suit or
proceeding. No indemnification may be provided for any person who shall have
been finally adjudicated not to have acted honestly or in the reasonable belief
that his or her action was in or not opposed to our best interests or who had
reasonable cause to believe that his or her conduct was unlawful.
Indemnification must be provided to any of our directors, officers, employees or
agents to the extent the person succeeded, on the merits or otherwise, in
defense of any action or claim described above. Any indemnification under this
provision of the Bylaws, unless required under the Bylaws or ordered by a court,
can be made only as authorized in each specific case upon a determination by a
majority of disinterested directors or by independent legal counsel or by the
shareholders that such indemnification is appropriate under the standard set
forth in the preceding sentence.
 
   
    The underwriting agreement to be filed as Exhibit 1.1 to the Registration
Statement provides for indemnification by the underwriters of USI and its
directors and certain officers, and by USI of the underwriters, for certain
liabilities arising under the Securities Act or otherwise.
    
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
    Set forth in chronological order is information regarding all securities
sold and employee stock options granted by the Registrant since January 14,
1998. Further included is the consideration, if any, received by the Registrant
for such securities, and information relating to the section of the Securities
Act of 1933, as amended (the "Securities Act"), and the rules of the Securities
and Exchange Commission under which exemption from registration was claimed. All
awards of options did not involve any sale under the Securities Act. None of
these securities were registered under the Securities Act. Except as described
below, no sale of securities involved the use of an underwriter and no
commissions were paid in connection with the sales of any securities.
 
                                      II-2
<PAGE>
1.  At various times during the period from January 1998 through January 5,
    1999, we have granted to employees and directors options to purchase an
    aggregate of 13,458,000 shares of Common Stock with an exercise price of
    $0.33. The issuance of these securities were not registered under the
    Securities Act in reliance upon Rule 701 of the rules promulgated under the
    Securities Act.
 
2.  On February 13, 1998, we issued 100 shares of Common Stock to Christopher R.
    McCleary.
 
   
3.  On May 13, 1998, we issued 15,750,000 shares of Common Stock to Christopher
    R. McCleary, Stephen E. McManus, Andrew A. Stern and Christopher Poelma at
    par value. The purchase price for the Common Stock was paid with cash and
    notes payable to the Company.
    
 
   
4.  On May 13, 1998, we issued 38,333.33 shares of Series A Preferred Stock for
    an aggregate purchase price of $23 million to the Initial Series A
    Investors. The purchase price for such shares was paid in cash at the time
    of the issuance. We simultaneously issued 1,666.67 shares of Series A
    Preferred Stock for an aggregate purchase price of $1 million to Christopher
    R. McCleary. The purchase price for such shares was paid by the forgiveness
    by Mr. McCleary of $1 million of debt that we owed him.
    
 
   
5.  On June 18, 1998, we issued 5,000 shares of Series A Preferred Stock for an
    aggregate purchase price of $3 million to certain of the Initial Series A
    Purchasers. We simultaneously issued 5,833.33 shares of Series A Preferred
    Stock for $3.5 million to U S WEST. The purchase price for such shares was
    paid in cash at the time of issuance.
    
 
   
6.  On June 19, 1998, we issued 3,000 shares of Series A Preferred Stock for an
    aggregate purchase price of $1.6 million to HAGC Partners, Chris Horgan (who
    later transferred his interest to his affiliate, Southeastern Technology
    Fund, L.P.) and the Account Management Purchasers. The purchase price for
    such shares was paid in cash at the time of issuance. We simultaneously
    issued 1,166.67 shares of Series A Preferred Stock for a purchase price of
    $700,002 to USI Partners. The purchase price for such shares was paid in
    cash at the time of issuance.
    
 
   
7.  On September 8, 1998, we issued convertible promissory notes in the
    aggregate amount of $9,095,000, together with warrants to purchase 7,795,722
    shares of Common Stock for $.01 per share, to certain of the existing
    holders of the Series A Preferred Stock. The purchase price for such notes
    and warrants was paid in cash at the time of issuance.
    
 
   
8.  On December 16, 1998, we issued convertible promissory notes in the
    aggregate amount of $8 million to certain of the existing holders of the
    Series A Preferred Stock. The purchase price for such notes was paid in cash
    at the time of issuance.
    
 
   
9.  On December 24, 1998, we issued convertible promissory notes in the amount
    of $5 million to U S WEST. The purchase price for such notes was paid in
    cash at the time of issuance.
    
 
   
10. On December 31, 1998, we issued 59,278.56 shares of Series B Preferred Stock
    for an aggregate purchase price of $62,242,500 to certain holders of the
    convertible promissory notes described above, certain holders of Series A
    Preferred Stock, and a number of new investors. The purchase price for such
    shares was paid in cash and/or by conversion of certain outstanding
    convertible promissory notes at the time of issuance.
    
 
   
    All of the shares of preferred stock described in paragraphs 3 through 10
above are being exchanged for shares of Common Stock prior to completion of this
offering. The issuances of the securities above were made in reliance on on or
more exemptions from registration under the Securities Act, including those
provided by Section 4(2) and Rule 701 thereunder. The purchasers of these
securities represented that they had adequate access, through their employment
with us or otherwise, to information about us.
    
 
                                      II-3
<PAGE>
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
   
    (a) Exhibits
    
 
   
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                                    DESCRIPTION
- ---------  ---------------------------------------------------------------------------------------------------------
<C>        <S>
    1.1*   Form of Underwriting Agreement
    3.1+   Amended and Restated Certificate of Incorporation of the Registrant
    3.2*   Form of Second Restated Certificate of Incorporation of the Registrant
    3.3+   Bylaws of the Registrant
    4.1*   Specimen Certificate for shares of Common Stock, $.001 par value, of the Registrant
    5.1*   Opinion of Latham & Watkins with respect to the validity of the securities being offered.
   10.1*   Stock Purchase Agreement between USI and the Initial Series A Purchasers dated May 13, 1998
   10.2*   Stock Purchase Agreement between USI and certain of the Initial Series A Purchasers dated June 18, 1998
   10.3*   Stock Purchase Agreement between USI and U S WEST dated June 18, 1998
   10.4*   Stock Purchase Agreement between USI and the Account Management Purchasers dated June 19, 1998
   10.5*   Stock Purchase Agreement between USI and HAGC Partners dated June 19, 1998
   10.6*   Stock Purchase Agreement between USI and Chris Horgen dated June 19, 1998
   10.7*   Stock Purchase Agreement between USI and USI Partners, Ltd. dated June 19, 1998
   10.8*   Stock Purchase Agreement among USI, IIT Holding, Inc., Luis Sebastian Alegrett, Michael Mai, Carlos E.
           Bravo, and Vicente Perez de Tudela dated August 28, 1998
   10.9*   Amended and Restated Stock Purchase Agreement among USI, Advanced Communication Resources, Inc., Matthew
           D. Kanter, The Benjamin Kanter 1997 QSST Trust, The Ronald Kanter 1997 QSST Trust and David S. Walden
           dated October 2, 1998
   10.10*  Stock Purchase Agreement between USI and certain other parties dated December 31, 1998
   10.11*  Amended and Restated Stockholders Agreement between USI and certain other parties dated December 31, 1998
   10.12*  Employment Agreement between USI and Christopher R. McCleary dated May 29, 1998
   10.13*  Employment Agreement between USI and Stephen E. McManus dated June 2, 1998
   10.14*  Employment Agreement between USI and Andrew A. Stern dated July 27, 1998
   10.15*  Employment Agreement between USI and Jeffrey L. McKnight dated December 15, 1998
   10.16*  Outsource Alliance Agreement between USI and PeopleSoft dated September 28, 1998
   10.17*  Software License Agreement between USI and Siebel dated December 23, 1998
   10.18*  Software License Agreement between USI and Sagent dated June 25, 1998
   10.19*  Software License and Service Agreement between USI and Broadvision dated July 22, 1998
   10.20*  Note Purchase Agreement among USI and the Account Management Purchasers dated September 8, 1998
   10.21*  Note Purchase Agreement between USI and Southeastern Technology Fund, L.P. dated September 8, 1998
   10.22*  Note Purchase Agreement among USI and certain other parties dated September 8, 1998
   10.23*  Note Purchase Agreement between USI and U S WEST dated September 8, 1998
   10.24*  Note Purchase Agreement between USI and certain other parties dated December 16, 1998
   10.25*  Note Purchase Agreement between USI and U S WEST dated December 24, 1998
   21.1+   Subsidiaries of the Registrant
   23.1    Consent of Mahoney Cohen & Company, P.C.
   23.2    Consent of Bassan & Associates S.C.
   23.3    Consent of Ernst & Young LLP regarding IIT financial statements
   23.4    Consent of Ernst & Young LLP regarding USI financial statements
   24.1+   Power of Attorney (included on signature page)
   27.1    Financial Data Schedule
   99.1+   Report of Independent Auditors
</TABLE>
    
 
- ------------------------
 
   
    * To be filed by amendment.
    
 
   
    + Previously filed.
    
 
                                      II-4
<PAGE>
    (b) Schedules
 
    All schedules have been omitted because they are not required or because the
required information is given in the Consolidated Financial Statements or Notes
thereto.
 
ITEM 17. UNDERTAKINGS
 
    Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the provisions contained in the Articles of
Incorporation, as amended, and By-Laws, as amended, of the Registrant and the
laws of the State of Delaware or otherwise, the Registrant has been advised that
in the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the
matters have been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.
 
    The undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.
 
    The undersigned Registrant hereby undertakes that:
 
(1) For purposes of determining any liability under the Securities Act, the
    information omitted from the form of prospectus filed as part of this
    Registration Statement in reliance upon Rule 430A and contained in a form of
    prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
    497(h) under the Securities Act shall be deemed to be part of this
    Registration Statement as of the time it was declared effective.
 
(2) For the purpose of determining any liability under the Securities Act, each
    post-effective amendment that contains a form of prospectus shall be deemed
    to be a new registration statement relating to the securities offered
    therein, and this offering of such securities at that time shall be deemed
    to be the initial bona fide offering thereof.
 
                                      II-5
<PAGE>
                                   SIGNATURES
 
   
    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED,
USINTERNETWORKING, INC. HAS DULY CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED
ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN ANNAPOLIS,
MARYLAND ON JANUARY 22, 1999.
    
 
   
<TABLE>
<S>                             <C>  <C>
                                USINTERNETWORKING, INC.
 
                                By:  /s/ ANDREW A. STERN
                                     -----------------------------------------
                                     Andrew A. Stern
                                     EXECUTIVE VICE PRESIDENT AND
                                     CHIEF FINANCIAL OFFICER
</TABLE>
    
 
   
    Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
NAME                                           TITLE                                   DATE
- ---------------------------------------------  --------------------------------------  ----------------------
<S>                                            <C>                                     <C>
                      *                        Chairman of the Board and Chief
- ------------------------------------             Executive Officer                        January 22, 1999
Christopher R. McCleary                          (Principal Executive Officer)
 
                      *
- ------------------------------------           President and Director                     January 22, 1999
Stephen E. McManus
 
/s/ ANDREW A. STERN                            Executive Vice President and Chief
- ------------------------------------             Financial Officer (Principal             January 22, 1999
Andrew A. Stern                                  Financial and Accounting Officer)
 
                      *
- ------------------------------------           Director                                   January 22, 1999
R. Dean Meiszer
 
                      *
- ------------------------------------           Director                                   January 22, 1999
Benjamin Diesbach
 
                      *
- ------------------------------------           Director                                   January 22, 1999
Ray A. Rothrock
 
                      *
- ------------------------------------           Director                                   January 22, 1999
Frank A. Adams
 
                      *
- ------------------------------------           Director                                   January 22, 1999
William F. Earthman
</TABLE>
    
<PAGE>
 
   
<TABLE>
<CAPTION>
NAME                                           TITLE                                   DATE
- ---------------------------------------------  --------------------------------------  ----------------------
- ------------------------------------
John H. Wyant                                  Director
<S>                                            <C>                                     <C>
 
- ------------------------------------
Joseph R. Zell                                 Director
 
                      *
- ------------------------------------           Director                                   January 22, 1999
Michael C. Brooks
 
                      *
- ------------------------------------           Director                                   January 22, 1999
David J. Poulin
 
*By: /s/ ANDREW A. STERN
    -------------------------------
    Andrew A. Stern
    Attorney-in-Fact
</TABLE>
    
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                                    DESCRIPTION
- ---------  ---------------------------------------------------------------------------------------------------------
<C>        <S>
    1.1*   Form of Underwriting Agreement
    3.1+   Amended and Restated Certificate of Incorporation of the Registrant
    3.2*   Form of Second Restated Certificate of Incorporation of the Registrant
    3.3+   Bylaws of the Registrant
    4.1*   Specimen Certificate for shares of Common Stock, $.001 par value, of the Registrant
    5.1*   Opinion of Latham & Watkins with respect to the validity of the securities being offered.
   10.1*   Stock Purchase Agreement between USI and the Initial Series A Purchasers dated May 13, 1998
   10.2*   Stock Purchase Agreement between USI and certain of the Initial Series A Purchasers dated June 18, 1998
   10.3*   Stock Purchase Agreement between USI and U S WEST dated June 18, 1998
   10.4*   Stock Purchase Agreement between USI and the Account Management Purchasers dated June 19, 1998
   10.5*   Stock Purchase Agreement between USI and HAGC Partners dated June 19, 1998
   10.6*   Stock Purchase Agreement between USI and Chris Horgen dated June 19, 1998
   10.7*   Stock Purchase Agreement between USI and USI Partners, Ltd. dated June 19, 1998
   10.8*   Stock Purchase Agreement among USI, IIT Holding, Inc., Luis Sebastian Alegrett, Michael Mai, Carlos E.
           Bravo, and Vicente Perez de Tudela dated August 28, 1998
   10.9*   Amended and Restated Stock Purchase Agreement among USI, Advanced Communication Resources, Inc., Matthew
           D. Kanter, The Benjamin Kanter 1997 QSST Trust, The Ronald Kanter 1997 QSST Trust and David S. Walden
           dated October 2, 1998
   10.10*  Stock Purchase Agreement between USI and certain other parties dated December 31, 1998
   10.11*  Amended and Restated Stockholders Agreement between USI and certain other parties dated December 31, 1998
   10.12*  Employment Agreement between USI and Christopher R. McCleary dated May 29, 1998
   10.13*  Employment Agreement between USI and Stephen E. McManus dated June 2, 1998
   10.14*  Employment Agreement between USI and Andrew A. Stern dated July 27, 1998
   10.15*  Employment Agreement between USI and Jeffrey L. McKnight dated December 15, 1998
   10.16*  Outsource Alliance Agreement between USI and PeopleSoft dated September 28, 1998
   10.17*  Software License Agreement between USI and Siebel dated December 23, 1998
   10.18*  Software License Agreement between USI and Sagent dated June 25, 1998
   10.19*  Software License and Service Agreement between USI and Broadvision dated July 22, 1998
   10.20*  Note Purchase Agreement among USI and the Account Management Purchasers dated September 8, 1998
   10.21*  Note Purchase Agreement between USI and Southeastern Technology Fund, L.P. dated September 8, 1998
   10.22*  Note Purchase Agreement among USI and certain other parties dated September 8, 1998
   10.23*  Note Purchase Agreement between USI and U S WEST dated September 8, 1998
   10.24*  Note Purchase Agreement between USI and certain other parties dated December 16, 1998
   10.25*  Note Purchase Agreement between USI and U S WEST dated December 24, 1998
   21.1+   Subsidiaries of the Registrant
   23.1    Consent of Mahoney Cohen & Company, P.C.
   23.2    Consent of Bassan & Associates S.C.
   23.3    Consent of Ernst & Young LLP regarding IIT financial statements
   23.4    Consent of Ernst & Young LLP regarding USI financial statements
   24.1+   Power of Attorney (included on signature page)
   27.1    Financial Data Schedule
   99.1+   Report of Independent Auditors
</TABLE>
    
 
- ------------------------
 
    * To be filed by amendment.
 
   
    + Previously filed.
    

<PAGE>
   
                                  EXHIBIT 23.1
                        CONSENT OF INDEPENDENT AUDITORS
    
 
   
We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated July 23, 1998, with respect to the financial statements
of Advanced Communication Resources, Inc., included in the Registration
Statement (Form S-1 No. 333-70717) and related Prospectus of USINTERNETWORKING,
Inc. dated January 22, 1999.
    
 
   
/s/ Mahoney Cohen & Company, CPA, P.C.
    
 
   
New York, New York
January 22, 1999
    

<PAGE>
   
                                  EXHIBIT 23.2
                        CONSENT OF INDEPENDENT AUDITORS
    
 
   
We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated August 20, 1998, with respect to the financial
statements of International Information Technology IIT, C.A., included in the
Registration Statement (Form S-1) and related Prospectus of USINTERNETWORKING,
Inc. dated January 22, 1999.
    
 
   
                                        /s/ Bassan & Associados S.C.
    
 
   
Caracas, Venezuela
January 22, 1999
    

<PAGE>
   
                                  EXHIBIT 23.3
                        CONSENT OF INDEPENDENT AUDITORS
    
 
   
We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated September 23, 1998, in Amendment No. 1, with respect to
the combined financial statements of International Information Technology, Inc.
and International Information Technology IIT, C.A., included in the registration
statement (Form S-1 No. 333-70717) and related Prospectus of USINTERNETWORKING,
Inc. dated January 22, 1999.
    
 
   
                                              /s/ Ernst & Young LLP
    
 
   
Baltimore, Maryland
    
 
   
January 22, 1999
    

<PAGE>
   
                                  EXHIBIT 23.4
                        CONSENT OF INDEPENDENT AUDITORS
    
 
   
We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated January 22, 1999, in Amendment No. 1, with respect to
the consolidated financial statements of USINTERNETWORKING, Inc., included in
the registration statement (Form S-1 No. 33-70717) and related Prospectus of
USINTERNETWORKING, Inc. dated January 22, 1999.
    
 
   
                                              /s/ Ernst & Young LLP
    
 
   
Baltimore, Maryland
    
 
   
January 22, 1999
    

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from
USinternetworking, Inc. and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<CIK> 0001076732
<NAME> USINTERNETWORKING, INC.
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-14-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                      43,802,465
<SECURITIES>                                         0
<RECEIVABLES>                                2,882,119
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            49,702,543
<PP&E>                                      21,640,145
<DEPRECIATION>                               1,567,885
<TOTAL-ASSETS>                             107,526,574
<CURRENT-LIABILITIES>                       25,433,994
<BONDS>                                              0
                       62,242,500         
                                        550
<COMMON>                                         5,000
<OTHER-SE>                                 (1,462,522)
<TOTAL-LIABILITY-AND-EQUITY>               107,526,574
<SALES>                                              0
<TOTAL-REVENUES>                             4,122,449
<CGS>                                                0
<TOTAL-COSTS>                                6,658,004
<OTHER-EXPENSES>                            27,362,849
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           2,681,088
<INCOME-PRETAX>                           (32,212,081)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                       (32,212,081)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (32,212,081)
<EPS-PRIMARY>                                   (0.46)
<EPS-DILUTED>                                   (0.46)
        

</TABLE>


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