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                                                                   EXHIBIT 10.21

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                            STOCK PURCHASE AGREEMENT

                                 BY AND BETWEEN

                          CONVERGENT GROUP CORPORATION

                                       AND

                          CINERGY COMMUNICATIONS, INC.

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

                           DATED AS OF APRIL 28, 2000

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                                TABLE OF CONTENTS

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ARTICLE I AGREEMENT TO PURCHASE AND SELL STOCK....................................................................1

ARTICLE II CLOSING DATE; DELIVERY.................................................................................2

   2.1    CLOSING DATE............................................................................................2
   2.2    DELIVERY................................................................................................2

ARTICLE III REPRESENTATIONS AND WARRANTIES OF THE COMPANY.........................................................3

   3.1    ORGANIZATION............................................................................................3
   3.2    AUTHORIZATION...........................................................................................3
   3.3    NO CONFLICT.............................................................................................4
   3.4    FINANCIAL STATEMENTS....................................................................................4
   3.5    BROKERS.................................................................................................4
   3.6    NO MATERIAL ADVERSE CHANGE..............................................................................4
   3.7    [INTENTIONALLY OMITTED].................................................................................5
   3.8    CAPITALIZATION OF THE SUBSIDIARIES......................................................................5
   3.9    NO ACTIONS, SUITS OR PROCEEDINGS........................................................................5
   3.10   ALL NECESSARY PERMITS, ETC..............................................................................5
   3.11   TITLE TO PROPERTIES.....................................................................................5
   3.12   Y2K.....................................................................................................6
   3.13   NO TRANSFER TAXES OR OTHER FEES.........................................................................6
   3.14   COMPANY NOT AN "INVESTMENT COMPANY".....................................................................6
   3.15   INSURANCE...............................................................................................6
   3.16   LABOR MATTERS...........................................................................................6
   3.17   RELATED PARTY TRANSACTIONS..............................................................................7
   3.18   NO UNLAWFUL CONTRIBUTIONS OR OTHER PAYMENTS.............................................................7
   3.19   ENVIRONMENTAL LAWS......................................................................................7
   3.20   ERISA COMPLIANCE........................................................................................7

ARTICLE IV REPRESENTATIONS AND WARRANTIES OF THE PURCHASER........................................................8

   4.1    ORGANIZATION............................................................................................8
   4.2    AUTHORITY...............................................................................................8
   4.3    NO CONFLICT.............................................................................................8
   4.4    INVESTMENT..............................................................................................9
   4.5    DISCLOSURE OF INFORMATION...............................................................................9
   4.6    INVESTMENT EXPERIENCE...................................................................................9
   4.7    ACCREDITED INVESTOR STATUS..............................................................................9
   4.8    RESTRICTED SECURITIES...................................................................................9
   4.9    BROKERS................................................................................................10

ARTICLE V CONDITIONS TO OBLIGATION OF THE PURCHASER..............................................................10

   5.1    REPRESENTATIONS AND WARRANTIES.........................................................................10
   5.2    COVENANTS..............................................................................................10
   5.3    NO ORDER PENDING.......................................................................................10
   5.4    NO LAW PROHIBITING OR RESTRICTING SALE OF THE SHARES...................................................10
   5.5    REGISTRATION RIGHTS AGREEMENT..........................................................................10
   5.6    INITIAL PUBLIC OFFERING................................................................................11
   5.7    OPINION OF COUNSEL TO THE COMPANY......................................................................11

ARTICLE VI CONDITIONS TO OBLIGATION OF THE COMPANY...............................................................11

   6.1    REPRESENTATIONS AND WARRANTIES.........................................................................11
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   6.2    COVENANTS..............................................................................................11
   6.3    NO PROHIBITION.........................................................................................11
   6.4    LOCKUP AGREEMENT.......................................................................................11
   6.5    REGISTRATION RIGHTS AGREEMENT..........................................................................11
   6.6    INITIAL PUBLIC OFFERING................................................................................12

ARTICLE VII POST-CLOSING COVENANTS OF THE COMPANY................................................................12

   7.1    CURRENT PUBLIC INFORMATION.............................................................................12

ARTICLE VIII POST-CLOSING COVENANTS OF THE PURCHASER.............................................................12

   8.1    RESTRICTIONS ON TRANSFER OF SHARES.....................................................................12
   8.2    ACQUISITION OF STOCK...................................................................................12

ARTICLE IX MISCELLANEOUS.........................................................................................13

   9.1    CERTAIN DEFINITIONS....................................................................................13
   9.2    GOVERNING LAW..........................................................................................14
   9.3    SURVIVAL; TERMINATION OF COVENANTS.....................................................................14
   9.4    SUCCESSORS AND ASSIGNS.................................................................................15
   9.5    ENTIRE AGREEMENT; AMENDMENT............................................................................15
   9.6    REMEDIES...............................................................................................15
   9.7    NOTICES................................................................................................15
   9.8    FEES, COSTS AND EXPENSES...............................................................................16
   9.9    SEVERABILITY...........................................................................................16
   9.10   INITIAL PUBLIC ANNOUNCEMENT............................................................................17
   9.11   COUNTERPARTS...........................................................................................17
   9.12   TERMINATION............................................................................................17
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                                    EXHIBITS

Exhibit A      -     Underwriters Lock-Up Letter

Exhibit B      -     Form of Registration Rights Agreement

Schedule 3.4   -     Financial Statements

Schedule 3.6   -     Subsequent Events

Schedule 3.17  -     Related Party Transactions

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         This STOCK PURCHASE AGREEMENT (this "Agreement") is made as of this
28th day of April, 2000, by and between Convergent Group Corporation, a Delaware
corporation (the "Company"), and Cinergy Communications, Inc., a Delaware
corporation (the "Purchaser").

                                    RECITALS

                  WHEREAS, the Company intends to consummate an initial public
offering (the "IPO") of shares of its common stock, $0.001 par value per share
("Common Stock");

                  WHEREAS, contemporaneous with the closing of the IPO and upon
the terms and conditions hereinafter set forth, the Company desires to sell, and
the Purchaser desires to purchase, the Shares (as hereinafter defined);

                  WHEREAS, contemporaneously with the execution and delivery of
this Agreement, the Purchaser shall execute the lockup agreement (the "Lockup
Agreement") to the underwriters of the IPO in the form attached hereto as
Exhibit A; and

                  WHEREAS, at or prior to Closing (as hereinafter defined), the
Company and the Purchaser shall enter into a registration rights agreement
substantially in the form attached hereto as Exhibit B (the "Registration Rights
Agreement").

                  NOW, THEREFORE, in consideration of the foregoing recitals,
the mutual promises hereinafter set forth, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto agree as follows:

                                   ARTICLE I

                      AGREEMENT TO PURCHASE AND SELL STOCK

         Upon the terms and subject to the conditions of this Agreement, the
Company hereby agrees to sell to the Purchaser at the Closing, and the Purchaser
agrees to purchase from the Company at the Closing, for the Per Share Purchase
Price the number of shares of Common Stock, rounded down to the nearest whole
number (the "Shares") determined in accordance with the following formula:

                          [     Outstanding Shares      ]
               Shares  =  [ --------------------------- ]  -  Outstanding Shares
                          [           .9501             ]

As used herein, "Outstanding Shares" means all outstanding shares of the
Company's capital stock as of the Closing Date, expressly including all shares
of Common Stock issuable upon the conversion of shares of the Company's Series A
Preferred Stock (the "Preferred Stock") and all shares of capital stock of the
Company being issued in the IPO (except for shares issuable upon the exercise of
the Underwriters' over-allotment option), but expressly excluding the Shares,
shares of Common Stock issuable upon the exercise of the Underwriters'
over-allotment option and all shares of capital stock issuable in the IPO upon
the exercise of outstanding but unexercised (as of the Closing Date) options,
warrants, convertible securities (except for the Preferred Stock) and other
rights to purchase or receive shares of the Company's capital stock.

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Within three days prior to the Closing, the Chief Financial Officer of the
Company shall deliver a certificate to the Purchaser confirming the number of
Outstanding Shares. As used herein, the "Per Share Purchase Price" shall be an
amount (with any fraction of a cent being rounded up (if such fractional portion
is $0.005 or higher) or down (if such fractional portion is lower than $0.005)
to the nearest whole cent) equal to 80% of the per share public offering price
of the Company's Common Stock in the IPO as it appears on the cover page of the
Company's final prospectus relating to the IPO.

                                   ARTICLE II

                             CLOSING DATE; DELIVERY

2.1      CLOSING DATE.

         The Closing of the purchase and sale of the Shares hereunder (the
"Closing") shall be held at the offices of O'Sullivan Graev & Karabell, LLP, 30
Rockefeller Plaza, New York, New York 10112 on the date and at the time of the
closing of the IPO as established pursuant to the underwriting agreement to be
executed by the Company in connection with the IPO. The date and time of the
closing hereunder is hereinafter referred to as the "Closing Date."

2.2      DELIVERY.

         At the Closing, the Company will deliver to the Purchaser a certificate
or certificates representing the Shares against payment of the Purchase Price by
wire transfer of immediately available funds to an account designated by the
Company. The certificate or certificates representing the Shares shall be
subject to a legend restricting transfer under the Securities Act of 1933, as
amended (the "Securities Act"), and referring to restrictions on transfer
herein, such legend to be substantially as follows:

         THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED. THESE SECURITIES HAVE BEEN
ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY
NOT BE SOLD, OFFERED FOR SALE, PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF IN
THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT FOR SUCH SECURITIES UNDER THE
ACT OR AN EXEMPTION THEREFROM. THE COMPANY MAY REQUEST AN OPINION OF COUNSEL
REASONABLY SATISFACTORY TO IT AS TO THE AVAILABILITY OF ANY SUCH EXEMPTION.

         THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
RESTRICTIONS ON TRANSFER, INCLUDING BY ANY SALE, PLEDGE OR OTHER HYPOTHECATION,
AS SET FORTH IN THE STOCK PURCHASE AGREEMENT DATED APRIL 28, 2000, A COPY OF
WHICH MAY BE OBTAINED FROM THE COMPANY AT ITS PRINCIPAL EXECUTIVE OFFICES."

         The Company agrees to remove the (i) legend set forth in the second
preceding paragraph if the Shares are sold pursuant to an effective registration
statement under the Securities Act or there is delivered to the Company an
opinion of nationally recognized counsel experienced in

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such matters in form and substance reasonably satisfactory to the Company that
the securities represented thereby need no longer be subject to restrictions
under the Securities Act and (ii) legend set forth in the immediately preceding
paragraph at such time as the Shares may be transferred in compliance with the
covenants of Section 8 hereof or upon the termination of the covenants of
Section 8 hereof as provided in Section 9.3 hereof.

                                  ARTICLE III

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         As of the date hereof, the Company hereby represents and warrants to
the Purchaser as follows:

3.1      ORGANIZATION.

         The Company is a corporation duly organized and validly existing under
the laws of the State of Delaware and is in good standing under such laws. The
Company has the requisite corporate power to own and operate its properties and
assets, and to carry on its business as presently conducted and as proposed to
be conducted. The Company is qualified to do business as a foreign corporation
in each jurisdiction in which the ownership of its property or the nature of its
business requires such qualification, except where the failure to be so
qualified would not have a materially adverse effect on the Company and its
subsidiaries, taken as a whole. Each subsidiary of the Company is a corporation
or partnership duly organized and validly existing under the laws of its
jurisdiction of organization and is in good standing under such laws, except
where the failure to be so organized, validly existing and in good standing
would not have a materially adverse effect on the Company and its subsidiaries
taken as a whole.

3.2      AUTHORIZATION.

         All corporate action on the part of the Company necessary for the
authorization, execution, delivery and performance of this Agreement and the
Registration Rights Agreement, and the authorization, sale, issuance and
delivery of the Shares hereunder, by the Company has been, or at or prior to the
Closing will be, taken. This Agreement and the Registration Rights Agreement has
been or will be at or prior to the Closing duly executed and delivered by the
Company and constitutes or will constitute a legal, valid and binding obligation
of the Company enforceable in accordance with their respective terms, except (i)
as such enforceability may be limited by any applicable bankruptcy, insolvency,
reorganization, moratorium or other similar laws affecting the enforcement of
creditors' rights generally, and general equitable principles (regardless of
whether such equitable principles are applied in a proceeding at law or in
equity) or (ii) as rights of indemnification and contribution under the
Registration Rights Agreement may be limited under applicable law. The Shares
have been duly authorized and upon their issuance and delivery pursuant to this
Agreement, the Shares will be validly issued, fully paid and nonassessable and
will be free of contractual restrictions except as set forth in Section 2.2 and
Article 8 of this Agreement and in the Registration Rights Agreement. There are
no statutory or contractual stockholders preemptive rights or rights of first
refusal with respect to the Shares that have not been satisfied or waived.
Subject to the truth and accuracy of Purchaser's representations in Section 4 of
this Agreement, the offer, sale and issuance of Shares under this

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Agreement is exempt from the registration requirements of any applicable federal
or state securities laws.

3.3      NO CONFLICT.

         The execution and delivery of this Agreement and the Registration
Rights Agreement does not, and the consummation of the transactions contemplated
hereby and thereby will not, conflict with, or result in any violation of, or
default under (with or without notice or lapse of time, or both), or give rise
to a right of termination, cancellation or acceleration of any obligation or
result in a loss of a material benefit under, any provision of the Certificate
of Incorporation or Bylaws of the Company or any mortgage, indenture, lease or
other material agreement, instrument, permit, concession, franchise, license,
judgment, order, decree, statute, law, ordinance, rule or regulation applicable
to the Company, its properties or assets, the effect of which could have a
material adverse effect on the Company and its subsidiaries, taken as a whole,
or materially impair or restrict the Company's ability to perform its
obligations as contemplated under this Agreement and the Registration Rights
Agreement.

3.4      FINANCIAL STATEMENTS.

               (a) Schedule 3.4 sets forth the audited consolidated balance
sheet (the "Balance Sheet") of the Company at December 31, 1999 (the "Balance
Sheet Date"), the related audited statement of operations, stockholders' equity
and cash flows of the Company for the twelve months then ended (including
complete footnotes thereto) (collectively, the "Financial Statements") audited
by Grant Thorton, LLP, the Company's independent public accountants and
accompanied by a copy of such accountants' report.

               (b) The Financial Statements: (i) present fairly the financial
position of the Company and its subsidiaries as of the Balance Sheet Date and
the results of operations, stockholders' equity and cash flows of the Company at
the dates and for the periods indicated, (ii) are in accordance with the books
and records of the Company, and (iii) have been prepared in accordance with
generally accepted accounting principles, consistently applied ("GAAP"), except
as expressly disclosed in the exhibits, schedules or notes thereto.
Notwithstanding the foregoing, the parties expressly acknowledge that, in
connection with its review of the Company's registration statement filed on Form
S-1 under the Securities Act, the Securities and Exchange Commission may request
changes to the Financial Statements, which the Company (based on the advice of
its independent accountants) may or may not incorporate into the Financial
Statements.

3.5      BROKERS.

         Neither the Company nor any of its officers, directors, employees or
stockholders has employed any broker or finder in connection with the
transactions contemplated by this Agreement.

3.6      NO MATERIAL ADVERSE CHANGE.

         Except as set forth on Schedule 3.6, subsequent to the Balance Sheet
Date: (i) there has been no material adverse change, or any development that
could reasonably be expected to result

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in a material adverse change, in the condition, financial or otherwise, or in
the earnings, business, operations or prospects, whether or not arising from
transactions in the ordinary course of business, of the Company and its
subsidiaries, considered as one entity (any such change or effect, where the
context so requires, is called a "Material Adverse Change" or a "Material
Adverse Effect"); (ii) the Company and its subsidiaries, considered as one
entity, have not incurred any material liability or obligation, indirect, direct
or contingent, not in the ordinary course of business nor entered into any
material transaction or agreement not in the ordinary course of business; and
(iii) there has been no dividend or distribution of any kind declared, paid or
made by the Company or, except for dividends paid to the Company or other
subsidiaries, any of its subsidiaries on any class of capital stock or
repurchase or redemption by the Company or any of its subsidiaries of any class
of capital stock.

3.7      [INTENTIONALLY OMITTED]

3.8      CAPITALIZATION OF THE SUBSIDIARIES.

         All the outstanding shares of capital stock of each subsidiary have
been duly authorized and validly issued and are fully paid and nonassessable,
and, except as otherwise set forth in the Prospectus, all outstanding shares of
capital stock of the subsidiaries are owned by the Company either directly or
through wholly owned subsidiaries free and clear of any security interests,
claims, liens or encumbrances, except for any such security interest, claims,
liens or encumbrances as would not have a Material Adverse Effect.

3.9      NO ACTIONS, SUITS OR PROCEEDINGS.

         No action, suit or proceeding by or before any court or governmental
agency, authority or body or any arbitrator involving the Company or any of its
subsidiaries or its or their property is pending or, to the best knowledge of
the Company, threatened that (i) could reasonably be expected to have a Material
Adverse Effect on the performance of this Agreement or the consummation of any
of the transactions contemplated hereby or (ii) could reasonably be expected to
have a Material Adverse Effect.

3.10     ALL NECESSARY PERMITS, ETC.

         The Company and each subsidiary possess such valid and current
certificates, authorizations or permits (collectively, "Permits") issued by the
appropriate state, federal or foreign regulatory agencies or bodies necessary to
conduct their respective businesses, except where the failure to possess any
such permits would not reasonably be expected to have a Material Adverse Effect,
and neither the Company nor any subsidiary has received any notice of
proceedings relating to the revocation or modification of, or non-compliance
with, any such Permit which, singly or in the aggregate, if the subject of an
unfavorable decision, ruling or finding, is reasonably likely to result in a
Material Adverse Change.

3.11     TITLE TO PROPERTIES.

         The Company and each of its subsidiaries has good and marketable title
to all the properties and assets reflected as owned in the Financial Statements,
in each case free and clear of any security interests, mortgages, liens,
encumbrances, equities, claims and other defects,

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except such as would not reasonably be expected to have a Material Adverse
Effect on the value of such property or the use made or proposed to be made of
such property by the Company or such subsidiary. The real property,
improvements, equipment and personal property held under lease by the Company or
any subsidiary are held under valid and enforceable leases, with such exceptions
as are not material and do not materially interfere with the use made or
proposed to be made of such real property, improvements, equipment or personal
property by the Company or such subsidiary.

3.12     Y2K.

         There are no Y2K issues related to the Company, or any of its
subsidiaries, that would reasonably be expected to result in any Material
Adverse Change.

3.13     NO TRANSFER TAXES OR OTHER FEES.

         There are no transfer taxes or other similar fees or charges under
federal law or the laws of any state, or any political subdivision thereof,
required to be paid in connection with the execution and delivery of this
Agreement or the issuance and sale by the Company of the Shares.

3.14     COMPANY NOT AN "INVESTMENT COMPANY".

         The Company is not, and after receipt of payment for the Shares will
not be, an "investment company" or an entity "controlled" by an "investment
company" within the meaning of the Investment Company Act of 1940, as amended
(the "ICA") and will conduct its business in a manner so that it will not become
subject to the ICA

3.15     INSURANCE.

         Each of the Company and its subsidiaries is insured by recognized,
financially sound and reputable institutions with policies in such amounts and
with such deductibles and covering such risks as are generally deemed adequate
and customary for their businesses including, but not limited to, policies
covering real and personal property owned or leased by the Company and its
subsidiaries against theft, damage, destruction, acts of vandalism and
earthquakes, general liability and Directors and Officers liability. The Company
has no reason to believe that it or any subsidiary will not be able (i) to renew
its existing insurance coverage as and when such policies expire or (ii) to
obtain comparable coverage from similar institutions as may be necessary or
appropriate to conduct its business as now conducted and at a cost that would
not result in a Material Adverse Change.

3.16     LABOR MATTERS.

         To the best of Company's knowledge, no labor disturbance by the
employees of the Company or any of its subsidiaries exists or is imminent; and
the Company is not aware of any existing or imminent labor disturbance by the
employees of any of its principal suppliers, that could reasonably be expected
to result in a Material Adverse Change.

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3.17     RELATED PARTY TRANSACTIONS.

         Except as set forth on Schedule 3.17, since the Balance Sheet Date
there have been no business relationships or related-party transactions
involving the Company or any subsidiary or any other person.

3.18     NO UNLAWFUL CONTRIBUTIONS OR OTHER PAYMENTS.

         Neither the Company nor any of its subsidiaries nor, to the best of the
Company's knowledge, any employee or agent of the Company or any subsidiary, has
made any contribution or other payment to any official of, or candidate for, any
federal, state or foreign office in violation of any law or that would
reasonably be expected to have a Material Adverse Effect.

3.19     ENVIRONMENTAL LAWS.

         The Company is in compliance in all material respects with all rules,
laws and regulations relating to the use, treatment, storage and disposal of
toxic substances and protection of health or the environment ("Environmental
Laws") which are applicable to its business, except where the failure to comply
would not result in a Material Adverse Change; (ii) the Company has received no
notice from any governmental authority or third party of an asserted claim under
Environmental Laws, which claim would reasonably be expected to have a Material
Adverse Effect; the Company is not currently aware that it will be required to
make future material capital expenditures to comply with Environmental Laws; and
no property which is owned, leased or occupied by the Company has been
designated as a Superfund site pursuant to the Comprehensive Response,
Compensation, and Liability Act of 1980, as amended (42 U.S.C. Section 9601, et
seq.), or otherwise designated as a contaminated site under applicable state or
local law.

3.20     ERISA COMPLIANCE.

         The Company and its subsidiaries and any "employee benefit plan" (as
defined under the Employee Retirement Income Security Act of 1974, as amended,
and the regulations and published interpretations thereunder (collectively,
"ERISA")) established or maintained by the Company, its subsidiaries or their
"ERISA Affiliates" (as defined below) are in compliance in all material respects
with ERISA, except where the failure to be in compliance would not reasonably be
expected to have a Material Adverse Effect. "ERISA Affiliate" means, with
respect to the Company or a subsidiary, any member of any group of organizations
described in Sections 414(b),(c),(m) or (o) of the Internal Revenue Code of
1986, as amended, and the regulations and published interpretations thereunder
(the "Code") of which the Company or such subsidiary is a member. No "reportable
event" (as defined under ERISA) has occurred or is reasonably expected to occur
with respect to any "employee benefit plan" established or maintained by the
Company, its subsidiaries or any of their ERISA Affiliates. No "employee benefit
plan" established or maintained by the Company, its subsidiaries or any of their
ERISA Affiliates, if such "employee benefit plan" were terminated, would have
any "amount of unfounded benefit liabilities" (as defined under ERISA). Neither
the Company, its subsidiaries nor any of their ERISA Affiliates has incurred or
reasonably expects to incur any liability under (i) Title IV of ERISA with
respect to termination of, or withdrawal from, any "employee benefit

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plan" or (ii) Sections 412, 4971, 4975 or 4980B of the Code. Each "employee
benefit plan" established or maintained by the Company, its subsidiaries or any
of their ERISA Affiliates that is intended to be qualified under Section 401(a)
of the Code is so qualified and nothing has occurred, whether by action or
failure to act, which would cause the loss of such qualification, except where
the failure to be so qualified would not reasonably be expected to have a
Material Adverse Effect.

                                   ARTICLE IV

                 REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

         The Purchaser hereby represents and warrants to the Company as follows:

4.1      ORGANIZATION.

         The Purchaser is a corporation duly organized and validly existing and
in good standing under the laws of the State of Delaware, with all requisite
corporate power and authority to own, lease and operate its properties and to
conduct its business as now being conducted.

4.2      AUTHORITY.

         All corporate action on the part of the Purchaser necessary for the
authorization, execution, delivery and performance of this Agreement and the
Registration Rights Agreement by the Purchaser has been, or at or prior to the
Closing will be, taken. This Agreement and the Registration Rights Agreement has
been or will be at or prior to Closing duly executed and delivered by the
Purchaser and constitutes or will constitute legal, valid and binding
obligations of the Purchaser, enforceable in accordance with their respective
terms, except as such enforceability may be limited by any applicable
bankruptcy, insolvency, reorganization, moratorium or other similar laws
affecting the enforcement of creditors' rights generally, and general equitable
principles (regardless of whether such equitable principles are applied in a
proceeding at law or in equity).

4.3      NO CONFLICT.

         The execution and delivery of this Agreement and the Registration
Rights Agreement does not, and the consummation of the transactions contemplated
hereby and thereby will not, conflict with, or result in any violation of, or
default under (with or without notice or lapse of time, or both), or give rise
to a right of termination, cancellation or acceleration of any obligation or
result in a loss of a material benefit under, any provision of the Certificate
of Incorporation of the Purchaser or any mortgage, indenture, lease or other
material agreement, instrument, permit, concession, franchise, license,
judgment, order, decree, statute, law, ordinance, rule or regulation applicable
to the Purchaser, its properties or assets, the effect of which could have a
material adverse effect on the Purchaser or materially impair or restrict the
Purchaser's ability to perform its obligations as contemplated under this
Agreement and the Registration Rights Agreement.

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4.4      INVESTMENT.

         The Purchaser is acquiring the Shares for investment for its own
account, not as a nominee or agent, and not with a view to, or for offer or
resale in connection with, directly or indirectly, any distribution thereof in
violation of the Securities Act or any other applicable securities laws and with
no intention of participating in the formulation, determination or direction of
the basic business decisions of the Company. The Purchaser understands that the
Shares have not been registered under the Securities Act by reason of a specific
exemption from the registration provisions of the Securities Act which depends
upon, among other things, the bona fide nature of the investment intent and the
accuracy of the Purchaser's representations and warranties contained herein.

4.5      DISCLOSURE OF INFORMATION.

         The Purchaser acknowledges that, except as is expressly set forth in
this Agreement, neither the Company nor FleetBoston Robertson Stephens Inc.,
Donaldson, Lufkin & Jenrette Securities Corporation or Wit SoundView or any
other member of the underwriting syndicate for the IPO (the "Underwriters"), nor
any person representing the Company or the Underwriters, has made any
representations with respect to the Company, the IPO or the Shares and that
neither the Company, the Underwriters nor any person representing the Company or
the Underwriters has provided any information to the Purchaser with respect to
the Company, the IPO or the Shares, other than as stated in this Agreement and
Registration Rights Agreement or as may be available to the Purchaser through
the Commission's EDGAR system.

4.6      INVESTMENT EXPERIENCE.

         The Purchaser understands that the purchase of the Shares involves
substantial risk. The Purchaser has experience as an investor in securities of
companies and acknowledges that it is able to fend for itself, can bear the
economic risk of its investment in the Shares, including a total loss of its
investment, and has such knowledge and experience in financial or business
matters that it is capable of evaluating the merits and risks of an investment
in the Shares and protecting its own interests in connection with this
investment.

4.7      ACCREDITED INVESTOR STATUS.

         The Purchaser is an institutional "accredited investor" within the
meaning of Regulation D promulgated under the Securities Act.

4.8      RESTRICTED SECURITIES.

         The Purchaser understands that the Shares to be purchased by the
Purchaser hereunder are "restricted securities" as defined in Rule 144 under the
Securities Act inasmuch as they are being acquired from the Company in a
transaction not involving a public offering and that under the Securities Act
and applicable regulations thereunder such securities may be resold without
registration under the Securities Act only in certain limited circumstances. The
Purchaser is familiar with Rule 144 of the Commission, as presently in effect,
and understands the resale limitations imposed thereby and by the Securities
Act. The Purchaser understands that the

                                       9
<PAGE>   14

Company is under no obligation to register any of the Shares sold hereunder
except as provided in the Registration Rights Agreement.

4.9      BROKERS.

         Neither the Purchaser nor any of its officers, directors, employees or
stockholders has employed any broker or finder in connection with the
transactions contemplated by this Agreement.

                                   ARTICLE V

                    CONDITIONS TO OBLIGATION OF THE PURCHASER

         The Purchaser's obligation to purchase the Shares at the Closing is, at
the option of the Purchaser, which may waive any such conditions, subject to the
fulfillment on or prior to the Closing Date of the following conditions:

5.1      REPRESENTATIONS AND WARRANTIES.

         Each of the representations and warranties of the Company contained in
Sections 3.1 through 3.3 will be true and correct in all material respects on
and as of the Closing Date with the same effect as though such representations
and warranties had been made as of the Closing Date. The Purchaser shall have
received a certificate signed by an officer of the Company to such effect on the
Closing Date.

5.2      COVENANTS.

         All covenants, agreements and conditions contained in this Agreement to
be performed by the Company on or prior to the Closing Date shall have been
performed or complied with in all material respects. The Purchaser shall have
received a certificate signed by an officer of the Company to such effect on the
Closing Date.

5.3      NO ORDER PENDING.

         There shall not then be in effect any order enjoining or restraining
the transactions contemplated by this Agreement or the Registration Rights
Agreement.

5.4      NO LAW PROHIBITING OR RESTRICTING SALE OF THE SHARES.

         There shall not be in effect any law, rule or regulation or a decree
prohibiting or restricting the sale of the Shares to the Purchaser, or requiring
any consent or approval of any Person which shall not have been obtained with
respect to the consummation of the transactions contemplated by this Agreement
(except as otherwise provided in this Agreement).

5.5      REGISTRATION RIGHTS AGREEMENT.

         The Company shall have executed and delivered the Registration Rights
Agreement.

                                       10
<PAGE>   15

5.6      INITIAL PUBLIC OFFERING.

         The Company shall have consummated the IPO prior to or
contemporaneously with the sale of the Shares hereunder.

5.7      OPINION OF COUNSEL TO THE COMPANY.

         The Purchaser shall have received an opinion of O'Sullivan Graev &
Karabell, LLP, counsel to the Company, substantially in the form of the draft
delivered to the Purchaser on the date hereof.

                                   ARTICLE VI

                     CONDITIONS TO OBLIGATION OF THE COMPANY

         The Company's obligation to sell and issue the Shares at the Closing
is, at the option of the Company, which may waive any such conditions, subject
to the fulfillment on or prior to the Closing Date of the following conditions:

6.1      REPRESENTATIONS AND WARRANTIES.

         The representations and warranties of the Purchaser contained in
Section 4 will be true and correct in all material respects on and as of the
Closing Date with the same effect as though such representations and warranties
had been made as of the Closing Date. The Company shall have received a
certificate signed on behalf of the Purchaser by an officer of the Purchaser to
such effect on the Closing Date.

6.2      COVENANTS.

         All covenants, agreements and conditions contained in this Agreement to
be performed by the Purchaser on or prior to the Closing Date shall have been
performed or complied with in all material respects. The Company shall have
received a certificate signed on behalf of the Purchaser by an officer of the
Purchaser to such effect on the Closing Date.

6.3      NO PROHIBITION.

         There shall not be in effect any law, rule, regulation or order
enjoining, restraining or prohibiting the transactions contemplated by this
Agreement including, without limitation, the sale of the Shares.

6.4      LOCKUP AGREEMENT.

         The Purchaser shall have executed and delivered (to the Company and the
Underwriters) the Lockup Agreement.

6.5      REGISTRATION RIGHTS AGREEMENT.

         The Purchaser shall have executed and delivered the Registration Rights
Agreement.

                                       11
<PAGE>   16

6.6      INITIAL PUBLIC OFFERING.

         The Company shall have consummated the IPO prior to or
contemporaneously with the sale of the Shares hereunder.

                                  ARTICLE VII

                      POST-CLOSING COVENANTS OF THE COMPANY

         From and after the Closing, the Company covenants to the Purchaser as
follows:

7.1      CURRENT PUBLIC INFORMATION.

         At all times after the Company's Registration Statement on Form S-1, as
amended, relating to the IPO (the "Registration Statement") shall have become
effective under the Securities Act, the Company shall use its reasonable best
efforts to file all reports required to be filed by it under the Securities Act
and the Securities Exchange Act of 1934, as amended (the "Exchange Act") and the
rules and regulations adopted by the Commission thereunder and shall use its
reasonable best efforts to take such further action as the Purchaser may
reasonably request, all to the extent required to enable the Purchaser to avail
itself of Rule 144 adopted by the Commission under the Securities Act (as such
rule may be amended from time to time) or any similar rule or regulation
hereafter adopted by the Commission and Form S-2 or S-3 or any similar
registration form hereafter adopted by the Commission for resales of securities.

                                  ARTICLE VIII

                     POST-CLOSING COVENANTS OF THE PURCHASER

         From and after the Closing, the Purchaser covenants to the Company as
follows:

8.1      RESTRICTIONS ON TRANSFER OF SHARES.

         For a period of one hundred and eighty (180) days from the Closing
Date, the Purchaser shall not, directly or indirectly, offer to sell, sell,
transfer, pledge, hypothecate or otherwise dispose of any Shares owned by it
except to (i) the Company or any person or group approved in writing by the
Company or (ii) an entity of which the Purchaser owns directly or indirectly
100% of the voting power entitled to be cast generally in the election of
directors or managers of such entity (a "Permitted Transferee"), so long as such
Permitted Transferee agrees prior to such transfer to hold such Shares subject
to all the provisions of this Agreement, including this Section 8.1, and agrees
to transfer such Shares to the Purchaser or another Permitted Transferee of the
Purchaser if it ceases to be a Permitted Transferee of the Purchaser.

8.2      ACQUISITION OF STOCK.

         The Purchaser shall advise management of the Company as to the
Purchaser's general plans to acquire, on the open market or otherwise, shares of
Common Stock, or rights thereto, equal to or in excess of 5.0% of the then
outstanding number of shares of Common Stock reasonably in advance of any such
acquisitions. All of the Purchaser's purchases of Common

                                       12
<PAGE>   17

Stock shall be in compliance with applicable laws and regulations and the
provisions of this Agreement.

                                   ARTICLE IX

                                  MISCELLANEOUS

9.1      CERTAIN DEFINITIONS.

         As used in this Agreement:

               (a) The term "Voting Stock" means the Common Stock and any other
securities issued by the Company or any successor thereto having the ordinary
power to vote in the election of directors of the Company (other than securities
having such power only upon the happening of a contingency).

               (b) The terms "Beneficial Owner," "Beneficial Ownership" and
"group" shall have the meaning comprehended by Section 13(d)(3) of the Exchange
Act and the rules and regulations of the Commission promulgated thereunder.

               (c) The term "Person" shall mean any person, individual,
corporation, general or limited partnership, trust, limited liability company or
other non-governmental entity or any governmental agency, court, authority or
other body (whether foreign, federal, state, local or otherwise).

               (d) The term "Change of Control" shall mean (i) an acquisition of
Voting Stock by a Person or group in a transaction or series of related
transactions if immediately thereafter such Person or group (other than the
Permitted Holders) has Beneficial Ownership of more than forty percent (40%) of
the combined voting power of the Company's then outstanding Voting Stock and the
Permitted Holders do not then Beneficially Own a greater percentage of the
combined voting power of the Company's then outstanding Common stock; (ii) the
consummation of the transactions contemplated by an agreement providing for a
tender offer, merger, consolidation or reorganization, or series of such related
transactions, involving the Company, unless the stockholders of the Company
immediately prior to such transaction or series of related transactions
Beneficially Own immediately after such transaction or transactions at least
twenty-five percent (25%) of the Voting Stock; (iii) a change or changes in the
membership of the Company's Board of Directors during any consecutive twelve
month period such that members who at the beginning of such period constituted
the Board of Directors (together with any new members whose election by such
Board of Directors or whose nomination for election by the stockholders of the
Company has been approved by a vote of at least a majority of the members then
still in office who either were members of the Board of Directors at the
beginning of such period or whose election or nomination for election was
previously so approved) cease to constitute a majority of the Board of Directors
of the Company; (iv) a sale, lease, exchange or other transfer (in one or a
series of related transactions) of all or substantially all of the Company's
assets or (v) the approval by the stockholders of the Company of any plan or
proposal of liquidation or dissolution of the Company.

                                       13
<PAGE>   18

               (e) The term "Insolvency Proceeding" shall mean (i) an assignment
for the benefit of creditors, (ii) the filing by or against the Company of a
petition to have Company adjudged insolvent, bankrupt or seeking a
reorganization or liquidation under any law relating to bankruptcy, insolvency
or receivership, (iii) an appointment of a receiver or trustee for all or
substantially all of the assets of the Company, (iv) a public admission in
writing of the Company's inability to pay its debts as they come due, or (v) the
adoption of a plan of liquidation or dissolution by the Board of Directors of
the Company.

               (f) The term "Permitted Holders" means each of (i) the officers
of the Company, (ii) the directors of the Company who were directors of the
Company on the Closing Date and any other directors of the Company whose
election by the Board of Directors or whose nomination for election by the
stockholders of the Company has been approved by a vote of at least a majority
of the members of the Board of Directors then still in office who either were
members of the Board of Directors on the Closing Date or whose election or
nomination for election was previously so approved, (iii) any entity listed in
the table or the footnotes thereto under the caption "Principal and Selling
Stockholders" in the Prospectus or (iv) any Affiliate or Related Person of any
of the foregoing.

               (g) The term "Affiliate" means with respect to any Person, any
other Person, directly or indirectly, controlling or controlled by or under
direct or indirect common control with such specified Person. For purposes of
this definition, "control" when used with respect to any Person means the power
to direct the management and policies of such Person, directly or indirectly,
whether through ownership of voting securities, by contract or otherwise.

               (h) The term "Related Person" means with respect to a person that
is a natural person (a)(1) any spouse, parent or lineal descendant, whether of
the whole or half blood, of such Person or (2) the estate of such Person during
any period in which such estate holds Common Stock of the Company for the
benefit of any person referred to in clause (a)(1) and (b) any trust,
corporation, partnership or other entity, the beneficiaries, stockholders,
partners, owners or Persons beneficially owning an interest of more than 50% of
which consist of such Person and/or such other Persons referred to in the
immediately preceding clause (a).

9.2      GOVERNING LAW.

         This Agreement will be governed by and construed in accordance with the
internal laws of the State of New York, without giving effect to any choice of
law or conflict of law provision or rule (whether of the State of New York, or
any other jurisdiction) that would cause the laws of any jurisdiction other than
the State of New York to be applied. In furtherance of the foregoing, the
internal law of the State of New York will control the interpretation and
construction of this Agreement, even if under such jurisdiction's choice of law
or conflict of law rules, the substantive law of some other jurisdiction would
ordinarily apply.

9.3      SURVIVAL; TERMINATION OF COVENANTS.

         The representations and warranties contained in Sections 3.1, 3.2, 3.3,
4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7 and 4.8 shall survive the Closing
indefinitely. The representations and warranties contained in Sections 3.4
through 3.20 shall survive the Closing until the first anniversary of the
Closing Date. No other representations or warranties contained herein shall
survive the Closing

                                       14
<PAGE>   19

Date. The covenants of the Purchaser under Section 8 hereof shall continue to
survive; provided, that such covenants shall terminate in the event of a Change
of Control or Insolvency Proceeding.

9.4      SUCCESSORS AND ASSIGNS.

         This Agreement shall be binding upon and shall inure to the benefit of
the parties hereto and their respective successors and assigns.

9.5      ENTIRE AGREEMENT; AMENDMENT.

         This Agreement and the Registration Rights Agreement constitute the
full and entire understanding and agreement between the parties with regard to
the subject matter hereof and thereof and supersede all prior agreements and
understandings among the parties relating to the subject matter hereof. Neither
this Agreement nor any term hereof may be amended, waived, discharged or
terminated other than by a written instrument signed by the party against whom
enforcement of any such amendment, waiver, discharge or termination is sought.
The enforceability and validity of this Agreement and the Registration Rights
Agreement are each to be determined separately and any finding that the
Registration Rights Agreement or any provision thereof is invalid or not
enforceable shall have no effect on the validity or enforceability of this
Agreement.

9.6      REMEDIES

         In addition to being entitled to exercise all rights provided herein
and granted by law, including recovery of damages, the Company and the Purchaser
shall be entitled to specific performance of the rights under this Agreement.
The parties hereto agree that monetary damages would not be adequate
compensation for any loss incurred by reason of a breach by it of the provisions
of this Agreement and hereby agree to waive, to the fullest extent permitted by
applicable law, the defense in any action for specific performance that a remedy
at law would be adequate.

9.7      NOTICES.

         All notices, requests, demands or other communications which are
required or may be given pursuant to the terms of this Agreement shall be in
writing and shall be deemed to have been duly given: (i) on the date of delivery
if delivered by hand, (ii) upon the third day after such notice is deposited in
the United States mail, if mailed by registered or certified mail, postage
prepaid, return receipt requested, or (iii) on the next day if sent by a
nationally recognized overnight express courier, (iv) by facsimile upon written
confirmation (other than the automatic confirmation that is received from the
recipient's facsimile machine) of receipt by the recipient of such notice or (v)
24 hours after sending if delivered by E-mail:

               (a) if to the Company, to it at:

                   Convergent Group Corporation
                   6399 South Fiddler's Green Circle, Suite 600
                   Englewood, CO 80111

                                       15
<PAGE>   20

                   Attention:  Glenn E. Montgomery, Jr.
                               Chairman, Chief Executive Officer and President
                   Tel:     (303) 741-8400
                   Fax:     (303) 741-8401

                   with a copy to:

                   O'Sullivan Graev & Karabell, LLP
                   30 Rockefeller Plaza
                   New York, New York 10112
                   Attention:  James M. Lurie
                   Tel:     (212) 408-2482
                   Fax:     (212) 408-2420

               (b) if to the Purchaser, to it at:

                   Cinergy Communications, Inc.
                   139 East 4th Street
                   30th Floor Atrium II
                   Cincinnati, Ohio 45201
                   Attention: Donald B. Ingle, Jr.

                   with a copy to:

                   Cinergy Communications, Inc.
                   139 East 4th Street
                   29th Floor Atrium II
                   Cincinnati, Ohio 45201
                   Attention:  Jerome A. Vennemann

9.8          FEES, COSTS AND EXPENSES.

         All fees, costs and expenses (including attorneys' fees and expenses)
incurred by either party hereto in connection with the preparation, negotiation
and execution of this Agreement and the Registration Rights Agreement, and the
consummation of the transactions contemplated hereby and thereby, shall be the
sole and exclusive responsibility of such party.

9.9      SEVERABILITY.

         If any term, provision, covenant or restriction of this Agreement is
held by a court of competent jurisdiction to be invalid, void or unenforceable,
the remainder of the terms, provisions, covenants and restrictions of this
Agreement shall remain in full force and effect and shall in no way be affected,
impaired or invalidated.

                                       16
<PAGE>   21

9.10     INITIAL PUBLIC ANNOUNCEMENT.

         The Company shall consult with the Purchaser with respect to the form
and content of the public announcement of this Agreement and the Registration
Rights Agreement, and the transactions contemplated hereby and thereby, as well
as about the content of the disclosure of this Agreement and the transactions
contemplated hereby in the Prospectus. The Purchaser shall provide reasonable
assistance to the Company in connection with such public announcement including,
without limitation, by providing all information reasonably requested by the
Company. The Company and the Purchaser shall agree on the form and content of
all other public announcements which shall be made concerning this Agreement and
the Registration Rights Agreement, and the transactions contemplated hereby and
thereby, and neither the Company nor the Purchaser shall make such public
announcement without the consent of the other, except as required by law.

9.11     COUNTERPARTS.

         This Agreement may be executed in counterparts, all of which shall
consolidate one agreement binding on the parties hereto, notwithstanding that
all such parties are not signatories to the original or same counterpart.

9.12     TERMINATION.

         This Agreement shall automatically terminate and be of no further force
and effect if the Company has not consummated the IPO on or before December 31,
2000.

                                    * * * * *

                                       17
<PAGE>   22

                  IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be executed by their respective authorized officers as of the date
set forth above.

                                    CONVERGENT GROUP CORPORATION

                                    By: /s/ Glenn E. Montgomery, Jr.
                                       -----------------------------------------
                                       Name:       Glenn E. Montgomery, Jr.
                                       Title:      Chairman, Chief Executive
                                                   Officer and President

                                    CINERGY COMMUNICATIONS, INC.

                                    By: /s/ James E. Rogers
                                       -----------------------------------------
                                       Name:       James E. Rogers
                                       Title:      Chief Executive Officer

<PAGE>   23

                                    EXHIBIT A

                                LOCK-UP AGREEMENT

FleetBoston Robertson Stephens Inc.
Donaldson Lufkin & Jenrette Securities Corporation
SoundView Technology Group, Inc.
     As Representatives of the Several Underwriters
c/o FleetBoston Robertson Stephens Inc.
555 California Street, Suite 2600
San Francisco, California 94104

RE:  Convergent Group Corporation (the "Company")

Ladies & Gentlemen:

                  The undersigned is an owner of record or beneficially of
certain shares of Common Stock of the Company ("Common Stock") or securities
convertible into or exchangeable or exercisable for Common Stock. The Company
proposes to carry out a public offering of Common Stock (the "Offering") for
which you will act as the Representatives (the "Representatives") of the
underwriters. The undersigned recognizes that the Offering will be of benefit to
the undersigned and will benefit the Company by, among other things, raising
additional capital for its operations. The undersigned acknowledges that you and
the other underwriters are relying on the representations and agreements of the
undersigned contained in this letter in carrying out the Offering and in
entering into underwriting arrangements with the Company with respect to the
Offering.

                  In consideration of the foregoing, the undersigned hereby
agrees that the undersigned will not offer to sell, contract to sell, or
otherwise sell, dispose of, loan, pledge or grant any rights with respect to
(collectively, a "Disposition") any shares of Common Stock, any options or
warrants to purchase any shares of Common Stock or any securities convertible
into or exchangeable for shares of Common Stock (collectively, "Securities") now
owned or hereafter acquired directly by such person or with respect to which
such person has or hereafter acquires the power of disposition, otherwise than
(i) as a bona fide gift or gifts, provided the donee or donees thereof agree in
writing to be bound by this restriction, (ii) as a distribution to partners or
shareholders of such person, provided that the distributees thereof agree in
writing to be bound by the terms of this restriction, (iii) with respect to
sales or purchases of Common Stock acquired on the open market or (iv) with the
prior written consent of FleetBoston Robertson Stephens Inc. The foregoing
restrictions will terminate after the close of trading of the Common Stock on
the 180th day of (and including) the day the Common Stock commenced trading on
the Nasdaq National Market (the "Lock-Up" Period). The foregoing restriction has
been expressly agreed to preclude the holder of the Securities from engaging in
any hedging or other transaction which is designed to or reasonably expected to
lead to or result in a Disposition of Securities during the Lock-up Period, even
if such Securities would be disposed of by someone other than such holder. Such
prohibited hedging or other transactions would include, without limitation, any
short sale (whether or not against the box) or any purchase, sale or grant of
any right (including, without limitation, any put or call option) with respect
to any

<PAGE>   24

Securities or with respect to any security (other than a broad-based market
basket or index) that included, relates to or derives any significant part of
its value from Securities. The undersigned also agrees and consents to the entry
of stop transfer instructions with the Company's transfer agent and registrar
against the transfer of shares of Common Stock or Securities held by the
undersigned except in compliance with the foregoing restrictions.

                  This agreement is irrevocable and will be binding on the
undersigned and the respective successors, heirs, personal representatives, and
assigns of the undersigned. In the event the Offering has not occurred on or
before September 30, 2000, this Lock-Up Agreement shall be of no further force
or effect.

                                   Dated:
                                         ---------------------------------------

                                   ---------------------------------------------
                                                          Printed Name of Holder

                                   By:
                                      ------------------------------------------
                                                                       Signature

                                   ---------------------------------------------
                                                  Printed Name of Person Signing
                                        (and indicate capacity of person signing
                                         if signing as custodian, trustee, or on
                                                            behalf of an entity)

<PAGE>   25

                                    EXHIBIT B

                      FORM OF REGISTRATION RIGHTS AGREEMENT

                                  SEE ATTACHED.

<PAGE>   26

                                  SCHEDULE 3.4

                              FINANCIAL STATEMENTS.

                                  SEE ATTACHED.

<PAGE>   27

                                  SCHEDULE 3.6

                               SUBSEQUENT EVENTS.

                                      NONE.

<PAGE>   28

                                  SCHEDULE 3.17

                           RELATED PARTY TRANSACTIONS.

                                      NONE.<PAGE>   1
                                                                   EXHIBIT 10.22

                  This AMENDMENT NO. 1 to the STOCK PURCHASE AGREEMENT dated as
of April 28, 2000 (the "Purchase Agreement") is made as of this 13th day of
June, 2000 by and between Convergent Group Corporation, a Delaware corporation
(the "Company"), and Cinergy Communications, Inc., a Delaware corporation (the
"Purchaser").

                                    RECITALS

                  WHEREAS, the Company and the Purchaser are parties to the
Purchase Agreement;

                  WHEREAS, the Company and the Purchaser wish to amend the
Purchase Agreement as set forth herein;

                  WHEREAS, capitalized terms used but not defined herein shall
have the meaning set forth in the Purchase Agreement; and

                  WHEREAS, at or prior to the First Tranche Closing (as
hereinafter defined), the Company and the Purchaser shall enter into a
shareholders agreement substantially in the form attached hereto as Exhibit A
(the "Shareholders Agreement");

                  NOW, THEREFORE, in consideration of the foregoing recitals,
the mutual promises hereinafter set forth, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto agree as follows:

         SECTION 1.  AMENDMENT AND RESTATEMENT OF ARTICLE I.

         Article I of the Purchase Agreement is hereby amended and restated to
read in its entirety as follows:

                                   "ARTICLE I

                      AGREEMENT TO PURCHASE AND SELL STOCK

1.1      PURCHASE AND SALE OF FIRST TRANCHE SHARES.

         Upon the terms and subject to the conditions of this Agreement, the
Company hereby agrees to sell to the Purchaser at the First Tranche Closing, and
the Purchaser hereby agrees to purchase from the Company at the First Tranche
Closing, 2,474,000 shares of Common Stock (the "First Tranche Shares") for an
aggregate purchase price of $10,000,000 (the "First Tranche Purchase Price").

1.2      PURCHASE AND SALE OF SECOND TRANCHE SHARES.

         Upon the terms and subject to the conditions of this Agreement, the
Company hereby agrees to sell to the Purchaser at the Second Tranche Closing,
and the Purchaser agrees to purchase from the Company at the Second Closing, for
the Per Share Purchase Price, the number of shares of Common Stock, rounded down
to the nearest whole number (the "Second Tranche

<PAGE>   2

Shares", and together with the First Tranche Shares, the "Shares") determined in
accordance with the following formula:

         Second       [     Base Shares                  ]
         Tranche   =  [ ------------------ - Base Shares ]  -  First Tranche
         Shares       [       .9501                      ]        Shares

         As used herein, "Base Shares" means all outstanding shares of the
Company's capital stock as of the Second Tranche Closing Date, expressly
including all shares of Common Stock issuable upon the conversion of shares of
the Company's Series A Preferred Stock (the "Preferred Stock") and all shares of
capital stock of the Company being issued in the IPO (except for shares issuable
upon the exercise of the Underwriters' over-allotment option), but expressly
excluding the Shares, shares of Common Stock issuable upon the exercise of the
Underwriters' over-allotment option and all shares of capital stock issuable in
the IPO upon the exercise of outstanding but unexercised (as of the Second
Tranche Closing Date) options, warrants, convertible securities (except for the
Preferred Stock) and other rights to purchase or receive shares of the Company's
capital stock.

         As used herein, the "Per Share Purchase Price" shall be an amount (with
any fraction of a cent being rounded up (if such fractional portion is $0.005 or
higher) or down (if such fractional portion is lower than $0.005) to the nearest
whole cent) equal to 80% of the per share public offering price of the Company's
Common Stock in the IPO as it appears on the cover page of the Company's final
prospectus relating to the IPO (the "IPO Price"); provided, however, if the
Post-IPO Enterprise Value of the Company (determined as provided below) is less
than $500,000,000, then the Per Share Purchase Price shall be reduced such that
the average per share purchase price for all Shares purchased pursuant to the
Agreement equals 80% of the IPO Price. For the avoidance of doubt, Annex I
hereto provides an example of an adjustment to the Per Share Purchase Price
where the Post-IPO Enterprise Value is less than $500,000,000. For the avoidance
of doubt, there shall be no adjustment to the Per Share Purchase Price if the
Post-IPO Enterprise Value is greater than or equal to $500,000,000. The Post-IPO
Enterprise Value shall be equal to the IPO Price multiplied by the sum of (A)
the Base Shares and (B) the Shares.

         Within three days prior to the Second Tranche Closing, the Chief
Financial Officer of the Company shall deliver a certificate to the Purchaser
confirming the number of Base Shares and the calculation of the Post-IPO
Enterprise Value."

         SECTION 2.  AMENDMENT AND RESTATEMENT OF SECTION 2.1.

         Section 2.1 of the Purchase Agreement is hereby amended and restated to
read in its entirety as follows:

"2.1     CLOSINGS.

         The closing of the purchase and sale of the First Tranche Shares
hereunder (the "First Tranche Closing") shall be held at the offices of
O'Sullivan Graev & Karabell, LLP, 30 Rockefeller Plaza, New York, New York 10112
on June 15, 2000 or such other time as the

                                       2
<PAGE>   3

parties to the Purchase Agreement shall otherwise agree. The date and time of
the First Tranche Closing hereunder is hereinafter referred to as the "First
Tranche Closing Date."

         The closing of the purchase and sale of the Second Tranche Shares
hereunder (the "Second Tranche Closing") shall be held at the offices of
O'Sullivan Graev & Karabell, LLP, 30 Rockefeller Plaza, New York, New York 10112
on the date and at the time of the closing of the IPO as established pursuant to
the underwriting agreement to be executed by the Company in connection with the
IPO. The date and time of the Second Tranche Closing hereunder is hereinafter
referred to as the "Second Tranche Closing Date." References herein to the
"Closing" shall mean the First Tranche Closing or the Second Tranche Closing, as
applicable, and references herein to the "Closing Date" shall mean the First
Tranche Closing Date or the Second Tranche Closing Date, as applicable."

         SECTION 3.  AMENDMENTS TO SECTION 2.2.

         A. The first sentence of Section 2.2 of the Purchase Agreement is
hereby amended and restated to read in its entirety as follows:

                  "At the applicable Closing, the Company will deliver to the
                  Purchaser a certificate or certificates representing the
                  number of Shares to be purchased by the Purchaser on such date
                  against payment of the applicable purchase price therefor by
                  wire transfer of immediately available funds to an account
                  designated by the Company."

         B. The second paragraph of the form of legend contained in Section 2.2
of the Purchase Agreement is hereby amended by adding the words "AS AMENDED,"
immediately after the words "APRIL 28, 2000,".

         SECTION 4.  WAIVER OF  CERTAIN CLOSING CONDITIONS.

                  With respect to the First Tranche Closing only, the Purchaser
hereby waives the closing condition set forth in Section 5.6 of the Purchase
Agreement. With respect to the First Tranche Closing only, the Company hereby
waives the closing condition set forth in Section 6.6 of the Purchase Agreement.

         SECTION 5.  AMENDMENTS TO ARTICLES V AND VI.

         A. Section 5.1 of the Purchase Agreement is hereby amended and restated
to read in its entirety as follows:

         "5.1 REPRESENTATIONS AND WARRANTIES.

         With respect to the First Tranche Closing, each of the representations
         and warranties of the Company contained in Article III hereof shall be
         true and correct in all material respects on and as of the First
         Tranche Closing Date with the same force and effect as though such
         representations and warranties had been made as of such Closing Date.

                                       3
<PAGE>   4

         With respect to the Second Tranche Closing, each of the representations
         and warranties of the Company contained in Sections 3.1 through 3.3
         will be true and correct in all material respects on and as of the
         Second Tranche Closing Date with the same force and effect as though
         such representations and warranties had been made as of such Closing
         Date. The Purchaser shall have received a certificate signed by an
         officer of the Company to such effect on the applicable Closing Date."

         B. Section 5.5 of the Purchase Agreement is hereby amended and restated
to read in its entirety as follows:

         "5.5 SHAREHOLDERS AGREEMENT AND REGISTRATION RIGHTS AGREEMENT.

         With respect to the First Tranche Closing, the Company shall have
         executed the Shareholders Agreement and the Registration Rights
         Agreement."

         C. Section 5.7 of the Purchase Agreement is hereby amended by adding
the words ", with respect to the Shares to be purchased by the Purchaser on such
Closing Date" after the word "hereof" and before the period (.) at the end of
the sentence.

         D. Section 6.5 of the Purchase Agreement is hereby amended and restated
to read in its entirety as follows:

         "6.5 SHAREHOLDERS AGREEMENT AND REGISTRATION RIGHTS AGREEMENT.

         With respect to the First Tranche Closing, the Purchaser shall have
         executed the Shareholders Agreement and the Registration Rights
         Agreement."

         SECTION 6.  AMENDMENTS TO ARTICLE VIII.

         A. The first line of Article VIII is hereby amended and restated to
read in its entirety as follows:

            "From and after the First Tranche Closing, the Purchaser covenants
            to the Company as follows:"

         B. Section 8.1 of the Purchase Agreement is hereby amended by deleting
at the beginning thereof the words "For a period of one hundred and eighty (180)
days from the Closing Date," and inserting in their place the words "For the
period commencing on the First Tranche Closing Date and ending on the day which
is one hundred and eight (180) days after the Second Tranche Closing Date,".

         SECTION 7.  AMENDMENTS TO ARTICLE IX.

         A. Section 9.3 of the Purchase Agreement is hereby amended and restated
to read in its entirety as follows:

                                       4
<PAGE>   5

         "9.3 SURVIVAL; TERMINATION OF COVENANTS.

         The representations and warranties contained in Sections 3.1, 3.2, 3.3,
         4.1, 4.2, 4.3,4.4, 4.5, 4.6, 4.7, and 4.8 shall survive the Closings
         indefinitely. The representations and warranties contained in Sections
         3.4 through 3.20 shall survive the Closings until the first anniversary
         of the Second Tranche Closing Date. No other representations or
         warranties herein shall survive the applicable Closing. The covenants
         of the Purchaser in Section 8 hereof shall continue to survive,
         provided that such covenants shall terminate in the event of a Change
         of Control or Insolvency Proceeding."

         B. Section 9.12 of the Purchase Agreement is hereby amended and
restated to read in its entirety as follows:

         "9.12.  TERMINATION OF OBLIGATIONS WITH RESPECT TO SECOND TRANCHE
         SHARES.

         The obligation of the Company to sell, and the obligation of the
         Purchaser to purchase, the Second Tranche Shares shall automatically
         terminate and be of no further force and effect if the Company has not
         consummated the IPO on a before December 31, 2000."

         SECTION 8.  NO FURTHER MODIFICATION.

                  Except as is expressly set forth herein, the Purchase
Agreement shall remain in full force and effect in accordance with its terms.

         SECTION 9.  MISCELLANEOUS.

                  A.       Entire Agreement; Amendment.

         The Purchase Agreement, as amended hereby, and the Registration Rights
Agreement constitute the full and entire understanding and agreement between the
parties with regard to the subject matter hereof and thereof and supersede all
prior agreements and understandings among the parties relating to the subject
matter hereof. Neither this Amendment nor any term hereof may be amended,
waived, discharged or terminated other than by a written instrument signed by
the party against whom enforcement of any such amendment, waiver, discharge or
termination is sought. The enforceability and validity of the Purchase
Agreement, as amended hereby, and the Registration Rights Agreement, are each to
be determined separately and any finding that the Registration Rights Agreement
or any provision thereof is invalid or not enforceable shall have no effect on
the validity or enforceability of this Agreement (as hereby amended).

                  B.       Severability.

         If any term, provision, covenant or restriction of this Amendment is
held by a court of competent jurisdiction to be invalid, void or unenforceable,
the remainder of the terms, provisions, covenants and restrictions of this
Amendment and the Purchase Agreement shall remain in full force and effect and
shall in no way be affected, impaired or invalidated.

                                       5
<PAGE>   6

                  C.       Counterparts.

         This Amendment may be executed in counterparts, all of which shall
consolidate one agreement binding on the parties hereto, notwithstanding that
all such parties are not signatories to the original or same counterpart.

                                    * * * * *

<PAGE>   7

                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be executed by their respective authorized officers as of the date
set forth above.

                                        CONVERGENT GROUP CORPORATION

                                        By: /s/ Glenn E. Montgomery, Jr.
                                           -------------------------------------
                                           Name:   Glenn E. Montgomery, Jr.
                                           Title:  Chairman, Chief Executive
                                                   Officer and President

                                        CINERGY COMMUNICATIONS, INC.

                                        By: /s/ James E. Rogers
                                           -------------------------------------
                                           Name:   James E. Rogers
                                           Title:  Chief Executive Officer

<PAGE>   8

                                     ANNEX I

                     CALCULATION OF PER SHARE PURCHASE PRICE
            WHERE POST-IPO ENTERPRISE VALUE IS LESS THAN $500,000,000
       (ALL SHARE NUMBERS BELOW GIVE EFFECT TO A ONE FOR TWO REVERSE STOCK
                  SPLIT AND CONVERSION OF THE PREFERRED STOCK)

FIRST TRANCHE SHARES

         SHARES: 1,237,000

         AGGREGATE PURCHASE PRICE: $10,000,000

SECOND TRANCHE SHARES

         IPO SHARES: 7,750,000 shares (Assumed)

         IPO PRICE: $10.50 (Assumed)

         BASE SHARES: 44,065,502 (Assumed)

         SECOND TRANCHE SHARES: 1,077,354 (Assumed)

         TOTAL SHARES OWNED: 2,314,354

         TOTAL SHARES OUTSTANDING AFTER IPO AND SECOND TRANCHE CLOSING:
46,379,856

CALCULATION OF PER SHARE PURCHASE PRICE

         POST-IPO ENTERPRISE VALUE: 46,379,856 x $10.50= $486,988,488

         80% OF IPO PRICE: $8.40

         AGGREGATE PURCHASE PRICE FOR ALL SHARES: 2,314,354 X $8.40 =
$19,440,573.60

         LESS FIRST TRANCHE PURCHASE PRICE: $10,000,000

         AGGREGATE PURCHASE PRICE FOR SECOND TRANCHE SHARES: $9,440,573.60

         PER SHARE PURCHASE PRICE: $9,440,573.60 / 1,077,354 = $8.76 (rounded)

<PAGE>   9

                                    EXHIBIT A

                   AMENDED AND RESTATED SHAREHOLDERS AGREEMENT

                                  See Attached.

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