Document:

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                                                                    EXHIBIT 10.8

                               SUBLEASE AGREEMENT

This Sublease dated as of September 1, 2000 is made between Nortel Networks
(CALA) Inc., a Florida corporation ("Sublandlord"), and Convergent Networks
Inc., a Delaware corporation ("Subtenant").

                                   Background

A.   Sublandlord is the tenant under the Lease dated on or about January 15,
     1998, a copy of which is attached hereto as Exhibit A and hereby made a
     part hereof ("Master Lease"), wherein Sawgrass Center Associates, as
     landlord ("Master Landlord"), leased to Sublandlord the entire fourth,
     third, and second floors and a portion of the first floor, consisting of
     approximately 73,876 rentable square feet, of certain real property known
     as the Corporate Centre at Sawgrass, Phase II, located at 1571 Sawgrass
     Corporate Parkway, Sunrise, FL 33323 ("Master Premises").

B.   Sublandlord and Subtenant now wish to enter into a sublease of a portion of
     the premises covered by the Master Lease, on the terms and conditions of
     this Sublease.

NOW, THEREFORE, the parties agree as follows:

1.   PREMISES

     Sublandlord hereby subleases to Subtenant on the terms and conditions set
     forth in this Sublease a portion of the Master Premises, consisting of the
     entire fourth floor, as highlighted on the floorplan attached hereto as
     Exhibit B ("Premises"), of the Master Premises, consisting of approximately
     24,090 rentable square feet. No later than five days after the date of this
     Sublease, Sublandlord shall provide Subtenant with drawings of the Premises
     (including voice and data wiring layouts) and a CAD disk of the
     improvements in the Premises. The sublease of the Premises includes
     Subtenant's use, at no charge, of the furniture (the "Furniture"), wiring,
     and other existing improvements in the Premises. The Furniture will be
     delivered in an "as is" condition, however Sublandlord will assign any
     warranty rights, if such rights are assignable and are available.

2.   TERM

     The term of this Sublease shall commence, as to occupancy, on or about
     September 1, 2000, or as soon thereafter as this Sublease is signed by both
     parties hereto and approved by the Master Landlord ("Commencement Date");
     with rent payments and payments on account of Operating Expense, to
     commence on December 1, 2000 (the "Rent Commencement Date"). The term shall
     continue until January 14, 2004, unless terminated prior to such date
     pursuant to the terms hereof. Sublandlord shall use reasonable efforts to
     assist Subtenant in requesting a term renewal from the Master Landlord.
<PAGE>

3.   RENT

     Commencing on the Rent Commencement Date, Subtenant shall pay to
     Sublandlord as base monthly rent for the Premises, without deduction,
     offset, notice, or demand, at 1500 Concord Terrace, Sunrise, FL 33323,
     attn.: Manuel Gonzalez, or at such other place as Sublandlord shall
     designate from time to time by notice to Subtenant, the annual sum of
     $14.50 per rentable square foot, equal to $29,108.75 per month ("Base
     Monthly Rent"). This base rent shall increase at a rate of 3% per year,
     compounded annually, effective on December 1, 2001, and on December 1 of
     each year thereafter during the term of this Sublease. This Base Monthly
     Rent shall be paid each month by Subtenant during the term and shall be
     paid in advance on or before the first day of each calendar month during
     said period.

4.   NET LEASE; OPERATING EXPENSES

     Commencing on the Rent Commencement Date, Subtenant shall pay to
     Sublandlord Subtenant's percentage share for all insurance, taxes, building
     operating costs and any other charges, fees, assessments or expense's
     payable by Sublandlord under the Master Lease ("Operating Expenses").
     "Subtenant's percentage share" shall be one hundred percent 100%) of all
     such Operating Expenses attributed to the Premises (estimated for year 2000
     to be $7.95 per rentable square foot, excluding janitorial expenses which
     are to be borne by Subtenant). Sublandlord shall pass through to Subtenant
     Subtenant's Percentage Share of all Operating Expenses charged to
     Sublandlord as and when billed by Master Landlord, for the 4th floor
     Premises, subject to all caps and exclusions per the Master Lease.
     Subtenant shall pay Subtenant's percentage share of Operating Charges as
     estimated from time to time by Master Landlord (subject to late adjustment)
     as additional rent. Unless otherwise specified, all payments of Subtenant's
     percentage share of Operating Expenses shall be payable in full on the date
     that the next installment of base monthly rent is payable.

5.   INSURANCE

     Subtenant shall also be obligated to carry any insurance required under the
     Master Lease covering the Premises or any tenant or subtenant improvements
     therein with any liability insurance naming Sublandlord as an additional
     insured. In addition, Subtenant shall carry insurance for the fully
     insurable amount covering all of Subtenant's personal property on the
     Premises. All insurance obtained by Subtenant shall contain a waiver of
     subrogation clause in favor of Sublandlord and Master Landlord. All
     property insurance obtained by Sublandlord and Master Landlord shall
     contain a waiver of subrogation clause in favor of Subtenant.

6.   SECURITY DEPOSIT

     Subtenant shall pay to Sublandlord a security deposit in the amount of
     $116,435.00 ($58,217.50 of which may be provided in the form of a letter of
     credit from a financial institution reasonably acceptable to Sublandlord)
     upon execution of this Sublease as security for full performance of all
     obligations of this Sublease. Subtenant shall be

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     required to leave the Premises in broom clean condition and in the same
     condition as of the commencement of this Sublease, normal wear and tear
     excepted, or Sublandlord may appropriate all or part of this deposit to
     repair any damage to the Premises. If Subtenant is not in default
     hereunder. Sublandlord shall return the deposit, if any remains, to
     Subtenant within thirty (30) days after the Sublease terminates.
     Sublandlord shall not be required to keep this deposit separate from its
     general funds, and Subtenant is not entitled to interest.

7.   USE OF PREMISES

     The Premises shall be used and occupied in accordance with the Use of
     Premises provision in the Master Lease.

8.   ASSIGNMENT AND SUBLETTING

     Subtenant shall not assign this Sublease or further sublet all or any part
     of the Premises without the prior written consent of Sublandlord and of
     Master Landlord, which the consent of either or both may be withheld for
     any reason in their respective discretion; provided, however, that
     Sublandlord shall not unreasonably withhold its consent with respect to
     assignments or sublets to Subtenant's affiliates.

9.   PROVISION OF SERVICES

     No services are currently included in base rent except for any provided by
     Master Landlord to Sublandlord under the Master Lease. If Sublandlord
     furnishes the Premises with any additional services upon request of
     Subtenant, Sublandlord shall charge Subtenant the out of pocket cost of
     providing such additional service, and Subtenant shall pay the additional
     charge within thirty days after billing by Sublandlord.

10.  CONDITION OF PREMISES; TRADE FIXTURES

     Subtenant accepts the Premises in their "as is" condition as of the
     Commencement Date, provided that the Premises shall be (a) broom clean, (b)
     contain the Furniture and other improvements located therein on the date of
     this sublease, and (c) vacant. Subtenant shall have the right to furnish
     and install any trade fixtures that are necessary for the conduct of its
     business; provided, however, that at the termination of this Sublease,
     Subtenant shall, if required by Sublandlord, remove such trade fixtures and
     restore the Premises at Subtenant's sole cost to the state and condition in
     which they existed on the Commencement Date, ordinary wear and tear
     excepted. If Subtenant fails to comply with the provisions of this
     paragaph, Sublandlord may make such repairs or restoration, and the
     reasonable cost thereof shall be additional rent payable by Subtenant on
     demand. All trade fixtures shall be and remain the property of Subtenant,
     provided that any such trade fixtures remaining on the Premises after the
     expiration or termination of the term hereof shall be deemed abandoned by
     Subtenant and shall, at Sublandlord's option, become the property of
     Sublandlord without payment therefor.

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11.  ALTERATIONS AND IMPROVEMENTS

     Sublandlord shall have no obligation to make any alterations or
     improvements to the Premises for Subtenants use or occupancy thereof.
     Subtenant shall have the same rights to make alterations as granted to
     Sublandlord under the Master Lease, subject to Sublandlord's approval which
     shall not be unreasonably withheld. Any alterations and additions to the
     Premises made by Subtenant shall be at Subtenant's expense and shall be
     made in accordance with the Master Lease, and shall be subject to prior
     written approval of Sublandlord and Master Landlord to the extent required
     under the Master Lease. Sublandlord shall not unreasonably withhold its
     consent to any alterations. Subtenant shall bear any costs charged by
     Master Landlord in reviewing Subtenant's alterations or
     plans/specifications for same. At Sublandlord's option, all alterations,
     additions and improvements (except for movable trade fixtures) shall be and
     remain the property of Sublandlord upon installation and shall be
     surrendered to Sublandlord upon the termination of this Sublease, or shall
     be removed by Subtenant and the Premises restored to their condition on the
     Commencement Date pursuant to the Master Lease. If Master Landlord requires
     such removal and restoration and Subtenant fails to comply, Sublandlord may
     do so and the reasonable cost thereof shall be additional rent payable by
     Subtenant on demand.

     Subtenant desires to build out within the Premises, a "computer lab."
     Should the plans and specifications for such computer lab be acceptable to
     Sublandlord, consistent with the terms of this section, then Sublandlord
     will use reasonable efforts to assist Subtenant in obtaining the approval
     of the Master Landlord, and to obtain any necessary plans for the Premises
     or the building where the Premises are located.

12.  SUBORDINATION TO MASTER LEASE

     This Sublease shall at all times be subject and subordinate to the terms
     and provisions of the Master Lease except as otherwise expressly set forth
     herein. Except as otherwise set forth in this Sublease and except for
     Sections 1.1(a), 1.1(b), 1.3 and 1.4 of the Master Lease, all of the terms
     and conditions contained in the Master Lease are hereby incorporated herein
     by this reference as terms and conditions of this Sublease, with each
     reference to Lessor and Lessee (or Landlord and Tenant, as applicable)
     therein to be deemed to refer to Sublandlord and Subtenant respectively
     herein. Unless mutually agreed upon by Sublandlord and Subtenant in
     writing, Sublandlord covenants and agrees that Sublandlord shall not enter
     into any modification or other agreement with respect to the Master Lease
     which would materially adversely effect the use by Subtenant of the
     Premises in accordance with the terms of this Sublease. Subject to the
     foregoing sentence, unless mutually agreed upon by Sublandlord and
     Subtenant in writing, Sublandlord covenants and agrees that Sublandlord
     shall not enter into any modification or other agreement with respect to
     the Master Lease which would materially adversely affect the use by
     Subtenant of the Premises in accordance with the terms of this Sublease.
     Sublandlord shall have the right but shall not be obligated to agree with
     the Master Landlord to any amendment to the Master Lease which the
     Sublandlord in its discretion deems to be appropriate, without the approval
     of the Subtenant. Sublandlord shall give Subtenant written notice of any
     such amendment, and such amendment shall be deemed to be binding on
     Subtenant hereunder.

     Upon the breach of any of the terms, conditions or covenants of the Master
     Lease or upon the failure of Subtenant to pay rent or comply with any of
     the provisions of this

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     Sublease, after Subtenant has received prior written notice and had an
     opportunity to cure, Sublandlord may exercise any and all rights and
     remedies granted to Master Landlord by the Master Lease. In the event that
     Subtenant breaches any of the terms conditions or covenants of this
     Sublease or of the Master Lease and fails to remedy such breach within
     fifteen (15) days of written notice, Sublandlord has the right, but not the
     obligation, to cure such breach and bill Subtenant for the costs incurred
     thereby, which costs Subtenant shall pay to Sublandlord upon demand.
     Subtenant shall not commit or suffer any act or omission that will violate
     any of the provisions of the Master Lease. If the Master Lease terminates,
     this Sublease shall terminate and the parties shall be relieved of any
     further liability or obligation under this Sublease; provided '. however,
     that Subtenant shall pay to Sublandlord all sums due and accrued under this
     Sublease as of the termination date.

13.  INDEMNITY

     Each party shall indemnify and hold harmless the other from liability,
     losses, damage, claims, suits or actions, judgments and expenses,
     (including reasonable attorney's fees) which may arise or grow out of
     injury to or death of any person or damage to any tangible property caused
     by the negligence or willful misconduct of such party, its agents,
     employees, or contractors. In case either party shall without fault on its
     part be made a party to any litigation commenced by or against such party
     for which it is to be indemnified hereunder, then the other party shall
     protect and hold harmless and pay all costs, penalties, charges, damages,
     expenses, and reasonable attorney's fees incurred or paid by the party
     indemnified hereunder.

14.  HOLDING OVER

     If Subtenant, with Sublandlord's and Master Landlord's written consent,
     remains in possession of the Premises or any part thereof after the
     expiration or other termination of the term hereof, such occupancy shall be
     a tenancy at sufferance at a rental in the amount of one hundred and fifty
     percent (150%) of the last monthly base rent installment and Operating
     Expenses, and upon all the other provisions of this Sublease pertaining to
     the obligations of Subtenant. Notwithstanding anything to the contrary
     herein, Subtenant shall pay to Sublandlord all costs incurred by
     Sublandlord as a result of Subtenant's holding over.

15.  ATTORNEYS' FEES

     If Sublandlord or Subtenant shall commence an action against the other
     arising out of or in connection with this Sublease, the prevailing party
     shall be entitled to recover its costs of suit and reasonable attorneys'
     fees.

16.  NOTICES OR DEMANDS

     Except as otherwise provided herein, all notices or demands herein provided
     to be given or made, or which may be given or made by either party to the
     other, shall be in writing and shall be deemed to have been duly given and
     made when deposited in the United States mail, certified mail, return
     receipt requested, postage prepaid and addressed as set

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     out below, or when deposited with a recognized and established overnight
     delivery service, return receipt requested, freight prepaid and addressed
     as set out below:

             To Sublandlord:    Nortel Networks (CALA) Inc.
                                1500 Concord Terrace
                                Sunrise, FL 33323
                                Attn: Manuel Gonzalez

             To Subtenant:      Convergent Networks Inc.
                                900 Chelmsford Street
                                Tower E
                                Lowell, MA 01851
                                Attn.: Robert Chow, General Counsel

     Notices shall be deemed received and effective upon receipt as evidenced by
     the U.S. Postal Service return receipt card or upon delivery by a
     nationally recognized overnight courier. The address to which notices or
     demands may be given or made by either party may be changed by written
     notice given by such party to the other pursuant to this paragraph.

17.  DISCLAIMER OF CONSEQUENTIAL DAMAGES

     In no event shall Master Landlord or Sublandlord and/or any of their
     respective affiliates, including without limitation any corporations or
     other entities controlling, controlled by or under common control with any
     of them, be liable for any consequential damages suffered by Subtenant in
     connection with any breach of this Sublease or otherwise.

18.  MASTER LANDLORD'S CONSENT

     Promptly following the execution and delivery of this Sublease by Landlord
     and Subtenant, Sublandlord shall submit this Sublease to Master Landlord
     and use reasonable efforts to obtain Master Landlord's consent.

19.  CHOICE OF LAW

     This Sublease shall be governed by the laws of the State of Florida, except
     for its conflict of law rules.

20.  ENTIRE AGREEMENT

     This Sublease, along with any exhibits and attachments hereto and the
     Master Lease, constitutes the entire agreement between Sublandlord and
     Subtenant relative to the Premises, and this Sublease and the exhibits and
     attachments may be altered, amended or revoked only by an instrument in
     writing signed by both Sublandlord and Subtenant and consented to by Master
     Landlord. Sublandlord and Subtenant agree hereby that all prior or
     contemporaneous oral agreements between and among themselves and their
     agents and representatives relative to the subleasing of the Premises are
     merged in or revoked by this Sublease.

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21.  SUCCESSORS AND ASSIGNS

     This Sublease shall inure to the benefit of and be binding upon the
     respective heirs, administrators, executors, successors and assigns of the
     parties hereto; provided, however, that this provision shall not be
     construed to allow an assignment or subletting which is otherwise
     specifically prohibited herein.

22.  SECTION AND PARAGRAPH HEADINGS

     The section and paragraph headings are included only for the convenience of
     the parties and are not part of this Sublease and shall not be used to
     interpret the meaning of provisions contained herein or the intent of the
     parties hereto.

23.  WARRANTY BY SUBTENANT

     Subtenant agrees to comply with and abide by all of the terms and
     conditions of this Sublease and the Master Lease (including the terms of
     the Master Lease incorporated herein by reference). Where the terms and
     conditions of the Master Lease are contradictory to the terms and
     conditions of this Sublease, the terms of the Sublease shall apply.

24.  WARRANTY BY SUBLANDLORD

     Sublandlord warrants and represents to Subtenant that Sublandlord has no
     knowledge of any claim that Sublandlord is in default or breach of any of
     the provisions of the Master Lease, and that all rent and other charges
     under the Master Lease have been paid through September 31, 2000.

25.  SIGNAGE

     Subtenant shall be permitted to display its name and logo in the elevator
     lobby and entry doors on the 4 th floor. Subtenant shall also be provided
     with a portion of the Building's monument sign to display its name and/or
     logo, subject to Master Landlord's approval.

26.  SATELLITE DISH AND FIBER OPTICS

     Subject to Master Landlord's and Sublandlord's (Sublandlord's approval not
     to be unreasonably withheld) approval, Subtenant, at its expense, shall
     have the right to install satellite dishes and fiber optics equipment on
     the roof or ground of the building, with all necessary cables, wires,
     transformers, etc. at any time during the term of the Sublease. Said
     installation will conform to all applicable laws, codes, ordinances, etc.
     Subtenant shall indemnify Master Landlord and Sublandlord for any and all
     costs arising from the installation, maintenance, existence and removal of
     any such dishes and equipment.

27.  PARKING

     Subtenant shall have all parking rights provided to Sublandlord by the
     Master Lease, proportionate to the Subtenant's share of the Master
     Premises.

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28.  ACCESS

     Subject to the terms of the Master Lease, Subtenant shall have access to
     the Premises 24 hours per day, seven days per week, 365/6 days per year.

IN WITNESS WHEREOF, the parties have caused this Sublease to be signed by their
duly authorized representatives to be effective on the date first set out above.

Sublandlord:                             Subtenant:
NORTEL NETWORKS (CALA INC.               CONVERGENT NETWORKS INC.

By:    Marcia Mosquera                   By:
Name:  Assistant Secretary               Name:
                                         Title:

Name:  Joe Dearing
Title: Assistant Secretary

                                       8<PAGE>

                                                                    Exhibit 10.9

                              EMPLOYMENT AGREEMENT
                              --------------------

     THIS EMPLOYMENT AGREEMENT (the "Agreement"), made this 25th day of
September, is entered into between Convergent Networks, Inc., a Delaware
corporation with its principal place of business at 900 Chelmsford Street, Tower
3, Lowell, MA 01851 (the "Company"), and John C. Thibault, residing at 17 Zeus
Drive, Chelmsford, MA 01824 (the "Employee").

     WHEREAS, the Company and the Employee desire to set forth the terms and
conditions of the Employee's continued employment with the Company;

     WHEREAS, the Company and the Employee entered into three separate stock
restriction agreements each dated February 15, 2000 (collectively, the "Stock
Restriction Agreements"), three separate escrow agreements each dated February
15, 2000 (collectively, the "Escrow Agreements") and the Employment Incentive
Compensation and Termination Agreement dated February 15, 2000 (the "Incentive
Compensation Agreement"); and

     WHEREAS, this Agreement sets forth the terms and conditions of the
Employee's continued employment with the Company and supercedes and replaces
each of the Stock Restriction Agreements, each of the Escrow Agreements and the
Incentive Compensation Agreement.

     NOW THEREFORE, in consideration of the mutual covenants and promises
contained herein, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged by the parties hereto, the parties
agree as follows:

     1. Term of Employment. The Company hereby agrees to employ the Employee,
and the Employee hereby accepts employment with the Company, upon the terms set
forth in this Agreement, for the period commencing on September 1, 2000 (the
"Commencement Date") and ending on March 31, 2002 (such period, as it may be
extended, the "Employment Period"), unless sooner terminated in accordance with
the provisions of Section 9.

     2. Title; Capacity. The Employee shall serve as Chairman, President and
Chief Executive Officer. The Employee shall be based at the Company's
headquarters in Lowell, Massachusetts. The Employee shall be subject to the
supervision of the Board of Directors.

     The Employee hereby accepts such employment and agrees to undertake the
duties and responsibilities inherent in such position and such other duties and
responsibilities as the Board of Directors or its designee shall from time to
time reasonably assign to the Employee.  The Employee agrees to devote his
entire business time, attention and energies to the business and interests of
the Company during the Employment Period.

     3. Compensation and Benefits.

        3.1 Salary. The Company shall pay the Employee, in periodic installments
in accordance with the Company's customary payroll practices, an annual base
salary of $200,000 for the one-year period commencing on the Commencement Date,
and commencing on January 1, 2001, Employee's annual base salary shall increase
to $250,000. After December 31, 2001, the Employee's salary shall be as
determined by the Board of Directors.

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<PAGE>

        3.2 Fringe Benefits. The Employee shall be entitled to participate in
all bonus and benefit programs that the Company establishes on no less favorable
terms than offered to other employees of the Company, except as otherwise
required under applicable law.

        3.3 Reimbursement of Expenses. The Company shall reimburse the Employee
for all reasonable travel, entertainment and other expenses incurred or paid by
the Employee in connection with, or related to, the performance of his duties,
responsibilities or services under this Agreement, in accordance with policies
and procedures, and subject to limitations, adopted by the Company from time to
time.

        3.4 Withholding. All salary, bonus and other compensation payable to the
Employee, including without limitation, payments due under Sections 4 and 7 of
this Agreement, shall be subject to applicable federal, state and local
withholding taxes.

     4. Payments to the Employee Upon Certain Events.

        4.1 Fiscal 2000 Performance Payment. In the event the Company achieves
the financial targets set forth in the FY2000 Plan, as determined by the Board
of Directors, the Employee shall be entitled to a payment of $275,000 ("FY2000
Bonus"), payable in lump sum on April 1, 2001.

        4.2 Fiscal 2001 Performance Payment. During the 2001 fiscal year,
Employee shall be eligible to receive up to a $300,000 cash bonus if the Company
meets certain financial targets for the 2001 fiscal year ("FY2001 Plan"), such
target to be determined by the Board of Directors. The Board of Directors shall
determine the FY2001 Plan no later than March 31, 2001.

        4.3 IPO Payment. In the event that the Company, prior to any Change of
Control, consummates an a public offering of its equity securities under the
Securities Act of 1933, as amended, resulting in gross proceeds to the Company
of at least Twenty Million Dollars ($20,000,000)(an "IPO") at any time prior to
January 1, 2002, while the Employee is employed with the Company, the Employee
shall be entitled to a payment equal to $275,000 ("IPO Payment"). Such payment
shall be payable in lump sum within ninety (90) days of the consummation of the
IPO.

     5. Repurchase Agreement

        5.1 For purposes of this Agreement, the "Shares" means the aggregate of
3,382,000 shares of the Company's Common Stock issued to the Employee on
February 15, 2000.

        5.2 Subject to Section 6, in the event that the Employee ceases to be
employed by the Company for any reason or no reason, with or without cause, the
Company shall have the right and option (the "Repurchase Option") to repurchase
from the Employee, for the sum of

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$1.00 per share (the "Repurchase Price"), all Shares that have not vested in
accordance with the following:

<TABLE>
<CAPTION>
DATE CESSATION OF EMPLOYMENT OCCURS:           SHARES SUBJECT TO REPURCHASE OPTION
------------------------------------           -----------------------------------
<S>                                            <C>
Before March 31, 2002                          100% as to all of the Shares, less 6.25% of
                                               2,882,000 of the Shares (as represented by the
                                               Certificate No. 150 as of the date of this
                                               Agreement) for each full three-month period
                                               from and after March 15, 2000 during which the
                                               Employee is employed by the Company.

On March 31, 2002 but before                   500,000 of the Shares (as represented by
January 31, 2005                               Certificate No. 144 and Certificate No. 145,
                                               each for 250,000 shares of Common Stock, as of
                                               the date of this Agreement).

On January 31, 2005                            0%
</TABLE>

        5.3 As used herein, "Vested Shares" at any particular time shall mean
Shares that are then no longer subject to the Repurchase Option and "Unvested
Shares" at any particular time shall mean all Shares that are subject to the
Repurchase Option.

        5.4  Escrow of Unvested Shares.

        (a) As security for the Employee's faithful performance of the
Employee's obligations under this Section 5, the Employee agrees, immediately
upon receipt of the stock certificates evidencing the Shares, to deliver such
certificates, together with a separate Stock Power and Assignment Separate from
Stock Certificate ("Stock Power") executed by the Employee (with the date and
number of Shares left blank) for each stock certificate representing the Shares,
to the Secretary of the Company or other designee of the Company ("Escrow
Holder"), who is hereby appointed to hold such certificates and Stock Powers in
escrow and to take all such actions and to effectuate all such transfers and/or
releases of such Shares as are in accordance with the terms of this Agreement.
All of the Shares will be released from escrow upon termination of the
Repurchase Option. Upon request of the Employee, the Escrow Holder shall arrange
with the Company for the release of any Vested Shares.

        (b) The Escrow Holder will act solely for the Company as its agent and
not as a fiduciary. The Employee and the Company agree that the Escrow Holder
will not be liable to any party to this Agreement (or to any other party) for
any actions or omissions, and the Escrow Holder shall be indemnified and held
harmless by the Employee and the Company for all liability, costs and expenses
incurred in connection with the Escrow Holder's carrying out of its duties under
this Section 5.4, except for any liability, costs or expenses arising from the
Escrow Holder's gross negligence or intentionally fraudulent acts or omissions
in carrying out its duties under this Section 5.4. The Escrow Holder may rely
upon any letter, notice or other document

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<PAGE>

executed by any signature purported to be genuine and may rely on the advice of
counsel and obey any order of any court with respect to the transactions
contemplated by this Agreement.

        5.5  Exercise of Repurchase Option.

        (a) The Company may exercise the Repurchase Option by delivering or
mailing to the Escrow Holder and the Employee within sixty (60) days after the
termination of the employment of the Employee with the Company, a written notice
of exercise of the Repurchase Option. Such notice shall specify the number of
Shares to be purchased. If and to the extent the Repurchase Option is not so
exercised by the giving of such a notice within such 60-day period, the
Repurchase Option shall automatically expire and terminate effective upon the
expiration of such 60-day period.

        (b) Within 10 days after his receipt of the Company's notice of the
exercise of the Repurchase Option pursuant to subsection (a) above, the Escrow
Holder shall tender to the Company at its principal offices the certificate or
certificates representing the Shares which the Company has elected to purchase,
duly endorsed in blank by the Employee or with duly endorsed stock powers
attached thereto, all in form suitable for the transfer of such Shares to the
Company. Upon its receipt of such certificate or certificates, the Company shall
deliver or mail to the Employee a check in the amount of the aggregate
Repurchase Price therefor.

        (c) After the time at which any Shares are required to be delivered to
the Company for transfer to the Company pursuant to subsection (b) above, the
Company shall not pay any dividend to the Employee on account of such Shares or
permit the Employee to exercise any of the privileges or rights of a stockholder
with respect to such Shares, but shall, insofar as permitted by law, treat the
Company as the owner of such Shares.

        (d) The Repurchase Price may be payable, at the option of the Company,
in cancellation of all or a portion of any outstanding indebtedness of the
Employee to the Company or in cash (by check) or both.

        (e) The Company shall not purchase any fraction of a Share upon exercise
of the Repurchase Option, and any fraction of a Share resulting from a
computation made pursuant to Section 2 of this Agreement shall be rounded to the
nearest whole Share (with any one-half Share being rounded upward).

        5.6  Restrictions on Transfer.

        (a) Except as otherwise provided in subsection 5.6(b) below, the
Employee shall not, during the term of the Repurchase Option, sell, assign,
transfer, pledge, hypothecate, or otherwise dispose of, by operation of law or
otherwise (collectively "transfer"), any of the Unvested Shares.

        (b) Notwithstanding the foregoing, the Employee may transfer Shares to
or for the benefit of any spouse, child, or grandchild, or to a trust for the
benefit, provided that any Unvested Shares shall remain subject to this
Agreement (including without limitation the restrictions on transfer set forth
in this Section 5 and the Repurchase Option), and such permitted transferee
shall, as a condition to such transfer, deliver to the Company a written
instrument

                                       4
<PAGE>

confirming that such transferee shall be bound by all of the terms and
conditions of this Agreement.

        5.7 Effect of Prohibited Transfer. The Company shall not be required (a)
to transfer on its books any of the Shares which shall have been sold or
transferred in violation of any of the provisions set forth in this Agreement,
or (b) to treat as owner of such Shares or to pay dividends to any transferee to
whom any such Shares shall have been so sold or transferred.

        5.8 Restrictive Legend. All certificates representing any Unvested
Shares shall have affixed thereto a legend in substantially the following form,
in addition to any other legends that may be required under federal or state
securities laws:

     "The shares of stock represented by this certificate are subject to
     restrictions on transfer and an option to purchase set forth in a certain
     Employment Agreement between the Corporation and the registered owner of
     these shares (or his predecessor in interest), and such Agreement is
     available for inspection without charge at the office of the Secretary of
     the Corporation."

     6. Acceleration of Vesting Upon Certain Events.

        6.1 Consummation of an IPO. In the event the Company consummates prior
to January 1, 2002, IPO , while the Employee is employed by the Company, 250,000
of the Shares (as represented by Certificate No. 144 on the date of this
Agreement) shall become Vested Shares upon the consummation of the IPO.

        6.2 Meeting Fiscal 2000 Financial Targets. If the Company meets the
financial targets ("FY2000 Plan") approved by the Board of Directors on April
13, 2000 by December 31, 2000, as determined by the Board of Directors, and the
Employee continues to be employed by the Company through December 31, 2000,
250,000 of the Shares (as represented by Certificate No. 145 on the date of this
Agreement) shall become Vested Shares on April 1, 2001.

        6.3 Change of Control. In the event of a Change of Control (as defined
below) of the Company while the Employee is employed by the Company, all of the
Shares shall become Vested Shares and the Repurchase Option as to all of the
Shares shall lapse upon the consummation of the Change of Control.  For purposes
of this Agreement, a "Change of Control" shall be deemed to occur if any of the
following conditions have occurred: (1) the merger or consolidation of the
Company with another entity where the Company is not the surviving entity and
where after the merger or consolidation (i) its stockholders prior to the merger
or consolidation hold less than 50% of the voting stock of the surviving entity
and (ii) its Directors prior to the merger or consolidation are less than a
majority of the Board of Directors of the surviving entity; (2) the sale of all
or substantially all of the Company's assets to a third party and subsequent to
the transaction (i) its stockholders hold less than 50% of the stock of said
third party and (ii) its Directors are less than a majority of the Board of
Directors of said third party; or (3) a transaction or series of related
transactions, including a merger of the Company with another entity where the
Company is the surviving entity, whereby (i) 50% or more of the voting stock of
the Company after the transaction(s) is owned actually or beneficially by
parties

                                       5
<PAGE>

who held less than thirty percent (30%) of the voting stock, actually or
beneficially, prior to the transaction(s) and (ii) its Board of Directors after
the transaction(s) or within 60 days thereof, is comprised of less than a
majority of the Directors serving prior to the transaction(s).

        6.4  Termination of Employment.

        (a) If the Company terminates the Employee's employment with the Company
without Cause on or before September 1, 2001, fifty person (50%) of all Unvested
Shares on the effective date of such termination shall become Vested Shares.

        (b) If the Company terminates the Employee's employment with the Company
without Cause after September 1, 2001, all Unvested Shares on the effective date
of such termination shall become Vested Shares.

     7. Forgiveness of Loan.

        7.1 Continuation of Employment after IPO. In the event the Company,
prior to any Change of Control, consummates an IPO at any time prior to January
1, 2002 while the Employee is employed with the Company, and:

        (a) the Employee remains continuously employed with the Company through
September 1, 2001, then $745,500 of the principal amount of the Company's
$2,982,000 loan to the Employee pursuant to the Promissory Note dated February
15, 2000, as amended on September 26, 2000 (the "Loan"), shall be forgiven on
the later of (i) September 1, 2001 or (ii) the date of the IPO.

        (b) the Employee remains continuously employed with the Company through
January 1, 2002, then an additional $745,500 of the principal amount under the
Loan shall be forgiven on January 1, 2002.

        (c) the Employee remains continuously employed with the Company through
March 31, 2002, then, $1,491,000, the balance of the principal amount under the
Loan shall be forgiven on March 31, 2002.

        7.2 Change of Control. In the event of a Change of Control of the
Company while the Employee is employed by the Company, the entire principal
amount then outstanding under the Loan shall be forgiven upon the consummation
of such Change of Control.

     8. Termination of Employment Period.  The employment of the Employee by the
Company pursuant to this Agreement shall terminate upon the occurrence of any of
the following:

        8.1  Expiration of the Employment Period; or

        8.2  At the election of the Company, for Cause (as defined below),
immediately upon written notice by the Company to the Employee, which notice
shall identify the Cause upon which the termination is based. For the purposes
of this Section 8.2, "Cause" shall mean (a) the conviction of the Employee of
any felony, or (b) any fraud or actions by the

                                       6
<PAGE>

Employee that are deemed by a majority of the Board of Directors to be
materially and grossly detrimental to the Company.

     9. Effect of Termination.

        9.1 Status of Employment Upon Expiration of Employment Period. If the
Employment Period expires pursuant to Section 1 hereof, and the Company and the
Employee have not reached any agreement regarding the extension of the term, the
Employee shall at his sole discretion continue his employment on an at-will
basis following the expiration of the Employment Period. Such at-will employment
relationship may be terminated by either party at any time and, except as to
Section 9.3, shall not be governed by the terms of this Agreement.

        9.2 Payments Upon Termination of Employment.

        (a) In the event the Employee's employment is terminated by the Company
with Cause or the Employee voluntarily terminates his employment, the Company
shall pay to the Employee the compensation and benefits otherwise payable to him
under Section 3 of this Agreement through the last day of his actual employment
by the Company.

        (b) In the event the Employee's employment is terminated by the Company
without Cause, the Company shall pay to the Employee the compensation and
benefits otherwise payable to him under Section 3 of this Agreement through the
last day of his actual employment by the Company plus the balance of salary that
would have been paid to the Employee had he continued his employment of the
Company to the end of the Employment Period.

         9.3 Survival. This Section 9.3 and Sections 5, 6 and 10 shall survive
any expiration or termination of this Agreement.

     10.  Miscellaneous.

         10.1 Notices. Any notices delivered under this Agreement shall be
deemed duly delivered four business days after it is sent by registered or
certified mail, return receipt requested, postage prepaid, or one business day
after it is sent for next-business day delivery via a reputable nationwide
overnight courier service, in each case to the address of the recipient set
forth in the introductory paragraph hereto. Either party may change the address
to which notices are to be delivered by giving notice of such change to the
other party in the manner set forth in this Section 10.1.

         10.2 Entire Agreement. This Agreement and the Key Employee
Noncompetition, Nondisclosure and Developments Agreement dated February 15, 2000
between the Company and the Employee constitute the entire agreement between the
parties and supersedes all prior agreements and understandings, whether written
or oral, relating to the subject matter of such agreements.

         10.3 Termination of Prior Agreements. The Stock Restriction Agreements,
the Escrow Agreements and the Incentive Compensation Agreement are hereby
terminated and shall be of no further force and effect as of the date of this
Agreement.

                                       7
<PAGE>

         10.4 Amendment. This Agreement may be amended or modified only by a
written instrument executed by both the Company and the Employee.

         10.5 Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of the Commonwealth of Massachusetts. Any action,
suit or other legal arising under or relating to any provision of this Agreement
shall be commenced only in a court of the Commonwealth of Massachusetts (or, if
appropriate, a federal court located within Massachusetts), and the Company and
the Employee each consents to the jurisdiction of such a court. The Company and
the Employee each hereby irrevocably waive any right to a trial by jury in any
action, suit or other legal proceeding arising under or relating to any
provision of this Agreement.

         10.6 Successors and Assigns. This Agreement shall be binding upon and
inure to the benefit of both parties and their respective successors and
assigns, including any corporation with which or into which the Company may be
merged or which may succeed to its assets or business, provided, however, that
the obligations of the Employee are personal and shall not be assigned by him.

         10.7 Waivers. No delay or omission by the Company in exercising any
right under this Agreement shall operate as a waiver of that or any other right.
A waiver or consent given by the Company on any one occasion shall be effective
only in that instance and shall not be construed as a bar or waiver of any right
on any other occasion.

         10.8 Captions. The captions of the sections of this Agreement are for
convenience of reference only and in no way define, limit or affect the scope or
substance of any section of this Agreement.

         10.9 Severability. In case any provision of this Agreement shall be
invalid, illegal or otherwise unenforceable, the validity, legality and
enforceability of the remaining provisions shall in no way be affected or
impaired thereby.

     THE EMPLOYEE ACKNOWLEDGES THAT HE HAS CAREFULLY READ THIS AGREEMENT AND
UNDERSTANDS AND AGREES TO ALL OF THE PROVISIONS IN THIS AGREEMENT.

                  [Remainder of page intentionally left blank]

                                       8
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day and year set forth above.

                              CONVERGENT NETWORKS, INC.

                              By:    /s/ Pamela F. Lenehan
                                     ---------------------

                              Title: Vice President and Chief Financial Officer

                              EMPLOYEE

                                     /s/ John C. Thibault
                                     ---------------------
                                     John C. Thibault

                    [Signature page to Employment Agreement]

                                       9

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