Document:

<PAGE>

                                                                   EXHIBIT 10.XX

                                       April 30, 1999

Dan Brown
760 Maegus Drive
Woodbury, NJ 08096

Dear Dan:

     This letter agreement sets forth the terms of the separation agreement
package between you and your employer, CompuCom Systems, Inc. (the "Company").
Please sign one of the two copies of this letter where indicated and return it
to me, keeping the other one for your own personal files.  You have been given
an opportunity to review the terms of this agreement with your own attorney and,
indeed, are encouraged to do so.  You and the Company are entering this
agreement with knowledge of the consequences and voluntarily.

     The terms of the Agreement are as follows:

I.   The Company and you have agreed to the following terms with respect to the
     remainder of your active employment and your separation from the Company's
     employment. Several of the below benefits to you, including the amount of
     severance pay, are over and above what would be required for a terminating
     employee in your situation. In exchange for these additional elements of
     the separation package, you have waived and released the Company with
     respect to any claims you might have, as set forth in the attached General
     Release and Agreement and you understand that this letter agreement only is
     effective upon the effectiveness of that General Release and Agreement.

     The terms of your remaining employment and separation are as follows:

     1.   You hereby confirm your resignation from the Company, effective
          October 22, 1998 and you hereby confirm your resignation from the
          Board of Directors of the Company and all its affiliated companies,
          effective October 22, 1998, including ClientLink, CIC Acquisition
          Corp., and Dataflex Acquisition Corp.

     2.   Severance will be 24 months' base salary ($ 28,150 / month), payable
          at times regular salary otherwise would be paid in November, 1998
          through  November, 2000 (the "Severance Period").

     3.   Your health insurance benefits will continue through the Severance
          Period unless in the interim you find new employment which provides
          comparable health insurance benefits.  Your COBRA notice will be given
          and any COBRA benefits will commence as of your date of resignation,
          October 22, 1998.
<PAGE>

          Please be advised that you may request a Certificate of Creditable
          Coverage at the following times: (i) immediately upon termination of
          your employment with the Company, (ii) at the time you elect not to
          extend your health insurance coverage under COBRA and (iii) at the
          time you terminate your health insurance coverage under COBRA.

     4.   Remaining Vacation Pay:  This severance package covers all back
          vacation days not taken by you.

     5.   The Company will pay the $10,700 supplemental life insurance policy
          premium due July 1, 1999; will continue your car allowance of $700 per
          month through the  Severance Period; no other benefits will be
          provided, including participation in the Employee Stock Purchase Plan,
          401(k) Plan or other insurnace programs, or payment of any club dues.

     6.   The Company will pay the two remaining payments on the house your
          purchased in Kiawah, each in the amount of $170,000 and to be made in
          May, 1999 and May, 2000, respectively.

     7.   Your loan to the Company evidenced by a Note in the principal amount
          of $661,251, dated June 16, 1997, and the $50,000 additional advance
          pursuant to that Note (which you hereby agree is to be amended to
          reflect this advance) plus interest will remain due on June 17, 2000;
          the Note will be modified to eliminate acceleration on termination of
          employment.

II.  Options

     1.   You were granted options for shares of stock in the Company.  The
          schedule of your options, the vesting and the option prices are set
          forth on the attached schedule.  Normally, the options must be
          exercised within 3 months of the termination of your employment.
          However, we will extend this time of exercise for the Severance
          Period.  As a result all of your options will be  treated as Non-
          Qualified Stock Options and you will be deemed a consultant of the
          Company during the Severance Period, being available on reasonable
          notice and with your consent, and for reasonable cost and expense
          payments, to provide consultation services to the Company.

IV.  Non-Compete and Confidentiality; Non-Disparagement

     1.   In further consideration of this severance package, you will execute
          the Confidentiality, Non-Compete and Non-Solicitation Agreement which
          is attached. The Company's obligations under this Severance Agreement
          are conditions on your adherence to this Agreement, including
          paragraph IV 2 hereof, and the Confidentiality, Non-Compete and Non-
          Solicitation Agreement.

     2.   You further agree not to disparage or otherwise criticize the Company,
          its officers, directors, employees, shareholders, affiliates, agents
          or representatives.
<PAGE>

III. Miscellaneous terms of our agreement are as follows:

     1.   Except as required of the Company to be disclosed by law, the Company
          and you agree that the terms of this agreement will be kept
          confidential by both parties except that you may advise your family
          and confidential advisers, and the Company may advise those people
          needing to know in implementation of the above terms.

     2.   Any questions that you may have respecting details or implementation
          of the agreement should be directed to Lazane Smith, as Chief
          Financial Officer of the Company.

     4.   This letter agreement and the General Release and Agreement contain
          all the terms relevant to your termination and the benefits of
          termination and replaces or supersedes any previous agreements or
          terms that may have existed with respect to these subject matters.
          This agreement can only be amended by a written amendment executed by
          both parties.

     5.   The letter agreement will be governed in accordance with the laws of
          the State of Texas.

<PAGE>

         I convey the very best wishes for your future career efforts. My
         signature below is the Company's commitment to the terms above.

                                       Sincerely yours,

                                       CompuCom Systems, Inc.

                                       By:  /s/ M. Lazane Smith
                                            -------------------
                                       Title: SVP / CFO

Agreed as to the separation package
and other terms set forth above:

   /s/ Daniel F. Brown
 -------------------------
<PAGE>

                         GENERAL RELEASE AND AGREEMENT
                         -----------------------------

NOTICE:
-------

     Various state and federal laws, including the Civil Rights Acts of 1964 and
1991 and the Age Discrimination in Employment Act, prohibit employment
discrimination based on age, sex, race, color, national origin, religion,
disability and veteran status.  These laws are enforced through the Equal
Employment Opportunity Commission (EEOC), the Department of Labor and state
civil rights agencies.

     If you sign this General Release and Agreement and accept the agreed-upon
special severance allowance and other termination benefits described in the
letter addressed to you which accompanies this release, you are giving up your
right to file a lawsuit pursuant to the aforementioned federal, state and local
laws in local, state or federal courts against [CompuCom Systems, Inc. and its
affiliates (the "Releasees") with respect to any claims relating to your
employment or termination therefrom which arise up to the date this Agreement is
executed.

     This Agreement does not prevent you from filing a charge of discrimination
with the Equal Employment Opportunity Commission, although by signing this
Agreement you waive your right to recover any damages or other relief in any
claim or suit brought by or through the Equal Employment Opportunity Commission
or any other state or local agency on your behalf under any federal or state
discrimination law, except where prohibited by law.  You agree to release and
discharge each Releasee not only from any and all claims which you could make on
your own behalf but also specifically waive any right to become, and promise not
to become, a member of any class in any proceeding or case in which a claim or
claims against a Releasee may arise, in whole or in part, from any event which
occurred as of the date of this Agreement.
<PAGE>

You agree to pay for any legal fees or cost incurred by any Releasee as a result
of any breach of the promises in this paragraph. The parties agree that if you,
by no action of your own, become a mandatory member of any class from which you
cannot, by operation of law or order of court, opt out, you shall not be
required to pay for any legal fees or costs incurred by a Releasee as a result.

     We encourage you to discuss the following release language with an attorney
prior to executing this Agreement.  In any event, you should thoroughly review
and understand the effect of the release before acting on it.  Therefore, please
take this release home and consider it for twenty-one (21) days before you
decide to sign it.
<PAGE>

                         GENERAL RELEASE AND AGREEMENT
                         -----------------------------

     As consideration for the special severance allowance and other termination
benefits offered to me by CompuCom Systems, Inc.  (hereinafter referred to as
the "Company") specified in the letter that accompanies this General Release and
Agreement, I release and discharge the Company, its directors, officers, agents,
employees, subsidiaries, divisions and any and all affiliate companies, as well
as any successor to the Company, from all claims, liabilities, demands and
causes of action, arising up to the date of execution of this Agreement, fixed
or contingent, known or unknown, which I may have or claim to have against the
Company arising from my employment or as a result of my termination from
employment, and do hereby covenant not to file a lawsuit to assert such claims.
This includes but is not limited to claims arising pursuant to the Age
Discrimination in Employment Act, or any other federal, state or local law or
regulation relating to discrimination in employment or equal opportunity or any
claims growing out of any legal restriction on the Company's right to terminate
its employees.

     I agree that I will not at any time publicize, write about, divulge or
discuss the existence of the General Release and Agreement, with any person or
entity whatsoever, other than my attorneys in this matter.

     I understand that this Agreement is revocable by me for a period of 7 days
following execution of the Agreement.  This Agreement shall not become effective
or enforceable until this 7 day revocation period  has ended.

     I have carefully read and fully understand all the provision of the Notice,
General Release and Agreement which set forth the entire agreement between me
and, and I acknowledge that I have not relied upon any representation or
statement, written or oral, not set forth in this document.

     IN WITNESS WHEROF, I have set my hand and seal this 30th day of  April
1999.

                                       /s/ Daniel F. Brown
                                       -------------------
<PAGE>

                            CompuCom Systems, Inc.

                            EMPLOYEE NON-DISCLOSURE
                NON-SOLICITATION AND NON-COMPETITION AGREEMENT

     In consideration of the letter agreement providing for my termination of
employment with CompuCom Systems, Inc. (the "Company"), I hereby agree with the
Company as follows:

          1.  I will not at any time reveal to any person or entity any of the
trade secrets or confidential information of the Company or of any third party
which the Company is under an obligation to keep confidential (including but not
limited to trade secrets or confidential information respecting inventions,
products, designs, methods, know-how, techniques, systems, processes, software
programs, works of authorship, customer lists, projects, plans and proposals),
and I shall keep secret all matters that have been entrusted to me and shall not
use or attempt to use any such information in any manner which may injure or
cause loss or may be calculated to injure or cause loss whether directly or
indirectly to the Company.

          The above restrictions shall not apply to: (i) information that at the
time of disclosure is in the public domain through no fault of mine; (ii)
information received from a third party outside of the Company that was
disclosed without a breach of any confidentiality obligation; (iii) information
approved for release by written authorization of the Company; or (iv)
information that may be required by law or an order of any court, agency or
proceeding to be disclosed; provided, I shall provide the Company notice of any
such required disclosure once I have knowledge of it and will help the Company
to the extent reasonable to obtain an appropriate protective order.

          Further, I represent that during my employment I have not taken, used
or permitted to be used any notes, memoranda, reports, lists, records, drawings,
sketches, specifications, software programs, data, documentation or other
materials of any nature relating to any matter within the scope of the business
of the Company or concerning any of its dealings or affairs otherwise than for
the benefit of the Company. I further agree that I shall not, after the
termination of my employment, use or permit to be used any such notes,
memoranda, reports, lists, records, drawings, sketches, specifications, software
programs, data, documentation or other materials, it being agreed that all of
the foregoing shall be and remain the sole and exclusive property of the Company
and that immediately upon the termination of my employment I shall deliver all
of the foregoing, and all copies thereof, to the Company, at its main office.

          2.  Until after November 30, 2000, two years after termination of my
employment, I agree that I will not:

               (i)    directly or indirectly solicit, entice or induce any
Customer (as defined below) to become a client, customer, OEM distributor or
reseller of any other person,
<PAGE>

firm or corporation with respect to products and/or services then sold or under
development by the Company or to cease doing business with the Company, and I
shall not approach any such person, firm or corporation for such purpose or
authorize or knowingly approve the taking of such actions by any other person;

               (ii)   directly or indirectly solicit, recruit or hire any
employee of the Company to work for a third party other than the Company or
engage in any activity that would cause any employee to violate any agreement
with the Company; or

               (iii)  whether alone or as a partner, officer, director,
consultant, agent, employee or stockholder of any company or other commercial
enterprise, directly or indirectly engage in any business or other activity in
the United States or Canada which is or may be competitive with or render
services to any firm or business organization which competes with the Company
in, the products or services being manufactured, marketed, distributed, planned
in writing or developed by the Company at the time of termination of such
employment. I shall be permitted to own securities of a public company not in
excess of five percent (5%) of any class of such securities and to own stock,
partnership interests or other securities of any entity not in excess of five
percent (5%) of any class of such securities and such ownership shall not be
considered to be in competition with the Company.

          For purposes of this Paragraph 2, a Customer means any person or
entity which at the time of determination shall be, or shall have been within
two (2) years prior to such time, a client, customer, OEM, distribution or
reseller of the Company.

          3.  I agree that any breach of this Agreement by me will cause
irreparable damage to the Company and that in the event of such breach the
Company shall have, in addition to any and all remedies of law, the right to an
injunction, specific performance or other equitable relief to prevent the
violation of my obligations hereunder.

          4.  Any waiver by the Company of a breach of any provision of this
Agreement shall not operate or be construed as a waiver of any subsequent breach
of such provision or any other provision hereof.

          5.  I hereby acknowledge that the type and periods of restriction
imposed in the provisions of this Agreement are fair and reasonable and are
reasonably required for the protection of the Company and the goodwill
associated with the business of the Company. I further agree that each provision
herein shall be treated as a separate and independent clause, and the
unenforceability of any one clause shall in no way impair the enforceability of
any of the other clauses herein. Moreover, if one or more of the provisions
contained in this Agreement shall for any reason be held to be excessively broad
as to scope, activity or subject so as to be unenforceable at law, such
provision or provisions shall be construed by the appropriate judicial body by
limiting and reducing it or them, so as to be enforceable to the maximum extent
compatible with the applicable law as it shall then appear.

          6.  My obligations under this Agreement shall survive the termination
of my employment regardless of the manner of such termination and shall be
binding upon my heirs, executors, administrators and legal representatives.
<PAGE>

          7.  The term "Company" shall include CompuCom Systems, Inc. and any of
its subsidiaries, subdivisions or affiliates. The Company shall have the right
to assign this Agreement to its successors and assigns, and all covenants and
agreements hereunder shall inure to the benefit of and be enforceable by said
successors or assigns.

          8.  This Agreement shall be governed by and construed in accordance
with the laws of State of Texas.

     IN WITNESS WHEREOF, the undersigned has executed this Agreement as a sealed
document as of the 30th day of  April, 1999.

                                       /s/ Daniel F. Brown
                                       -------------------
                                       Signature

                                       Daniel F. Brown
                                       ---------------
                                       Name - Please Print

                                       760 Maegus Drive
                                       ----------------
                                       Woodbury, NJ  08096
                                       -------------------
                                       Address<PAGE>

                                                                   EXHIBIT 10.YY

February 12, 2000

John Lyons
66 Vine Road
Larchmont, NY  10538

Dear John:

This letter evidences the agreement between you and CompuCom Systems, Inc.
("CompuCom"), effective as of the date of your acceptance as indicated by your
signature on the last page hereof, as to the following matters:

     1.   Termination of Employment:  Effective as of the close of business on
          --------------------------
          January 14, 2000, you resigned your position as an officer of
          CompuCom.  You and CompuCom mutually, willingly and voluntarily
          terminated your employment relationship effective January 14, 2000.

          (a)  Continuation Pay: Subject to the limitations of, and in
               ----------------
               consideration of this agreement, you will receive payments of
               $10,576.92 bi-weekly through January 14, 2001. All future
               payments in consideration of this agreement will cease
               immediately upon your accepting employment of any kind with any
               company considered to be a competitor of CompuCom and will also
               cease if you become an owner or shareholder (more than 5%),
               director, lender or consultant to any entity considered to be a
               competitor of CompuCom. It is your responsibility to notify
               CompuCom when you obtain a new position. You further agree not to
               disparage or otherwise criticize CompuCom, its officers,
               directors, employees, shareholders, affiliates, agents or
               representatives.

          (b)  Stock Options: All unvested stock options will be terminated as
               -------------
               of January 14, 2000.

     2.   Benefits:  Current medical and dental insurance benefits will extend
          --------
          through January 14, 2001 or until alternate employment is obtained and
          medical and dental coverage is available through a new employer. All
          other benefits will end January 14, 2000.

     3.   COBRA: Commencing January 14, 2001, you may elect to continue your
          -----
          medical insurance through COBRA for up to eighteen (18) months.
          CompuCom will provide you with the forms pursuant to which you can
          elect to continue this coverage. If you elect to continue your current
          medical coverage through COBRA, you will be responsible for paying the
          cost of such continuing coverage.

     4.   Solicitation of CompuCom Employees:  In consideration of this
          ----------------------------------
          agreement, you agree that for a period of one year following the
          termination date, you will not, either voluntarily or otherwise, for
          yourself or on behalf of any other person, partnership or corporation,
          solicit for employment or employ any employee of CompuCom or any of
          its affiliates.
<PAGE>

Page 2
January 24, 2000
John Lyons

     5.   Solicitation of CompuCom Customers: Until after January 14, 2001, one
          ----------------------------------
          year after the termination of my employment, I agree that I will not
          directly or indirectly solicit, entice or induce any Customer to
          become a client, customer, OEM distributor or reseller of any other
          person, firm or corporation with respect to products and/or services
          then sold or under development by CompuCom or to cease doing business
          with CompuCom, and I shall not approach any such person, firm or
          corporation for such purpose or authorize or knowingly approve the
          taking of such actions by any other person.  For purposes of this
          paragraph, Customer means any person or entity which at the time of
          termination shall be, or shall have been within two (2) years prior to
          such time, a client, customer, OEM, distributor or reseller of the
          company or any current customer of CompuCom, including customers
          acquired in the TASD acquisition and those TASD customers currently on
          the "Protected List".

     6.   Confidential Information: You recognize and agree that documents,
          ------------------------
          files, records, data and other information developed and acquired by
          CompuCom and its affiliates as to which you have had access constitute
          "trade secrets" under applicable law and that under no circumstances
          or for any reason will you utilize such confidential business
          information, and such confidential business information shall remain
          the sole property of CompuCom and its affiliates. You further agree to
          keep confidential and not use or disclose to any third party without
          the prior written consent of CompuCom any confidential information
          known or possessed by you pertaining to CompuCom, its past and present
          officers, directors, agents, employees, attorneys, representatives,
          affiliates, predecessors, successors and assigns, if any, including,
          without limitation all documents, memoranda, records, reports, notes,
          notebooks, manuals, business plans, data, written information,
          computer information, tapes, film and other material of any kind
          containing or comprising confidential information in your possession
          or control, all of which you acknowledge to be the exclusive property
          of CompuCom and agree to deliver to CompuCom on or prior to the
          effective date of this Agreement.

     7.   Release:  You do hereby for yourself and for your heirs,
          --------
          representatives, executors,  administrators, successors and assigns
          irrevocably and unconditionally waive, release and forever discharge
          CompuCom and its past, present and future officers, directors, agents,
          employees, attorneys, representatives, affiliates, predecessors,
          successors and assigns, if any, together with any employee benefit
          plan sponsored by any such person, corporation or other entity, and
          any fiduciary of any such employee benefit plan (hereinafter referred
          to as "Releasees"), and each of them, from any and all claims,
          obligations, rights of action, suits, agreements, damages, attorneys'
          fees, costs and all other liabilities of any kind or description
          whatsoever, either in law or in equity, whether known or unknown,
          suspected or unsuspected, from the beginning of time to the date of
          execution hereof.  This release specifically includes, but is not
          limited to, all claims arising out of or related in any manner to your
          employment with CompuCom or any of its affiliates, your claims, if
          any, under Title VII of the Civil Rights Act of 1964 (42 U.S.C.
          (S)2000(e), et seq), the Age Discrimination in Employment Act of 1967,
                      -- ---
          as amended (29 U.S.C. (S) 621, et seq) (the "ADEA"), including the
                                         -- ---
          Older Workers' Benefits Protection Act of 1990 amendment to the ADEA,
          the Americans With Disabilities Act of 1990 (42 U.S.C. (S) 12101, et
                                                                            --
          seq), the Employee Retirement Income Security Act (29
          ----
<PAGE>

Page 3
January 24, 2000
John Lyons

          U.S.C. (S) 1140), and the Texas Commission on Human Rights Act (as
          codified in the Texas Labor Code), or any claim for wrongful
          discharge or other violation of public policy, or any claim for breach
          of contract, or for claims for alleged libel, slander, or defamation
          of character, or any other claim based on your employment.  You
          further agree not to file a claim or suit of any kind against
          CompuCom, or any of its affiliates, their respective officers, agents
          or representatives, past or present, relating to your employment or to
          participate voluntarily in any employment related claim brought by any
          party against CompuCom or any of its affiliates.  You expressly
          acknowledge that you are unaware of any fact that would provide a
          basis for any claim, liability or cause of action against Releases
          that you are waiving and releasing under this Section .

     8.   No Compensation Owing:  You expressly acknowledge that, as of the date
          ----------------------
          of this letter, you have received all wages, commissions and/or other
          compensation of any kind owed to you by CompuCom except as otherwise
                                                           -------------------
          provided for in this letter.  Additionally you agree that as of the
          ----------------------------
          effective date of this agreement, all CompuCom property, including
          computer hardware, software, pagers, cell phones, keys, access badges,
          travel cards, credit cards, etc. has been returned to CompuCom and
          will not be used by you and that any debt owed to CompuCom by you has
          been settled.  You also expressly acknowledge that all confidential
          information of any kind has been returned to CompuCom and that you
          have not retained paper copies, data files, electronic data, etc. of
          any CompuCom proprietary or confidential information.

     9.   Non-Disclosure:  You agree that you will not disclose, other than
          --------------
          under mandate of a court of competent jurisdiction or governmental
          agency, to any person other than confidentially to your immediate
          family, financial advisor and attorney any provision of this letter.

     10.  Binding Effect:  The terms of this letter shall be binding upon you,
          --------------
          your heirs, beneficiaries, administrators, executors, successors and
          assignees and upon CompuCom and its respective successors and
          assignees.

     11.  Entire Agreement: The terms of this letter constitute the entire
          -----------------
          agreement of the parties regarding the subject matter hereof, and any
          and all prior and contemporaneous statements, representations,
          negotiations, commitments or agreements, oral or written, relating to
          the subject matter contained in this letter are merged herein and
          superseded hereby and are of no legal force or effect whatsoever.

<PAGE>

Page 4
January 24, 2000
John Lyons

     12.  Miscellaneous:
          --------------

          (a)  You acknowledge that the terms of this letter not only are
               understandable, but that they are fully understood by you.

          (b)  You acknowledge that you have 21 days to review this agreement
               before executing; that CompuCom advised you in writing to consult
               with an attorney before executing this letter; that you had an
               adequate opportunity to review this letter with an attorney, that
               you fully understand its terms; that you were not coerced into
               signing this letter, and that you have signed this letter
               knowingly and voluntarily.

          (c)  In order to revoke the terms of this letter, you must notify Dave
               Loeser, Sr. VP Human Resources, of CompuCom, in writing, of your
               decision to revoke; and such notice must be received within 7
               days of the execution date of this agreement.

If this letter correctly sets forth our agreements with respect to the subject
matter hereof, please indicate your acceptance in the space provided below and
return one copy to Dave Loeser whereupon it shall constitute a binding agreement
between you and CompuCom.  If this letter is not executed by you and delivered
to CompuCom on or before Monday, February 7, 2000 the provisions hereunder shall
be null and void, having no force or effect.

Sincerely,

COMPUCOM SYSTEMS, INC.                                   ACCEPTED AND AGREED TO

By: /s/David A. Loeser                                   /s/John Lyons
    -------------------                                  ----------------------
                                                         John Lyons
the 24th day of January, 2000

Its: Sr. Vice President, Human Resources           Date:  February 4, 2000

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