Document:

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                                                                   Exhibit 10.61

                                PLEDGE AGREEMENT
                                ----------------

         This is a pledge agreement made as of October 8, 2001 between Scott G.
Silk, an individual residing at 30 Partridge Lane, Boxford, Massachusetts 01921
("Pledgor") and ePresence, Inc., a Massachusetts corporation, with its principal
place of business located at 120 Flanders Road, Westboro, Massachusetts, 01581
("Pledgee").

                                   WITNESSETH:

         WHEREAS, the Pledgor has issued a secured promissory note (the "Note")
of even date herewith in the original principal amount of Fifteen Thousand Four
Hundred Ninety Five Dollars and Sixty Eight Cents ($15,495.68) Dollars payable
to the Pledgee pursuant to its terms; and

         WHEREAS, as collateral security for the obligations of the Pledgor
under the Note, the Pledgor has agreed to pledge and grant to the Pledgee a
first priority security interest in 15,000 shares (the "Shares") of common stock
of the Pledgee that are restricted under an Executive Officer Restricted Stock
Agreement (the "Restricted Stock Agreement") between the Pledgor and the Pledgee
dated October 8, 1999, as more fully set forth herein;

         NOW THEREFORE, the parties hereto agree and acknowledge that the
foregoing recitals are true and correct and to the following:

         1. Pledge of Collateral. As collateral security for the performance of
            --------------------
the obligations of the Pledgor under the Note (the "Obligations"), the Pledgor
hereby pledges and grants to the Pledgee a security interest in and to the
Shares, and any and all stock rights, powers and other distributions, dividends
or proceeds thereof. In addition, any stock rights, dividends, powers or other
distributions or proceeds received by the Pledgor shall be held in trust for and
delivered to the Pledgee to be held in accordance with the terms of this
Agreement, and shall be included in the Shares described above.

         2. Holding of the Shares. The Shares are maintained in book entry for
            ---------------------
the account of the Pledgor by the Pledgee's transfer agent with an applicable
restrictive legend regarding the pledge of the Shares hereunder. Upon payment in
full of the Notes, the Pledgee shall instruct the transfer agent to remove the
restrictive legend from the Shares.

         3. Pledgee's Rights and Duties with Respect to the Collateral.
            ----------------------------------------------------------
Pledgee's only duty with respect to the Shares shall be to exercise reasonable
care to secure the safe custody thereof all other duties being hereby expressly
disclaimed. Pledgee shall have the right, but not the obligation, to (a) demand,
sue for, receive and collect all money or money damages payable on account of
any Shares, (b) protect, preserve or assert any other rights of Pledgor or take
any other action with respect to the Shares, and (c) pay any taxes, liens,
assessments, insurance premiums or other charges pertaining to Shares. Any
expenses incurred by Pledgee under the preceding sentence shall be paid by
Pledgor upon demand and become part of the Obligations secured by the Shares.
Pledgee shall be relieved of all responsibility for the Shares upon surrendering
them to Pledgor.

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     4. Pledgor's Warranties and Indemnity.
        ----------------------------------

        4.1 Pledgor represents, warrants and covenants (a) that Pledgor is the
lawful owner of the Shares, (b) that the Shares are fully paid and
nonassessable, (c) that as of the date hereof, the Shares are free and clear of
all liens, encumbrances, and security interests, other than the security
interest granted by the Pledgor hereunder, and this pledge constitutes a valid
and perfected security interest in the Shares enforceable against the Pledgor,
(d) that the Shares are not subject to any outstanding rights of redemption or
options to purchase or sell except as set forth in the Restricted Stock
Agreement, (e) that the Pledgor has the sole right and lawful authority to
pledge the Shares and otherwise to comply with the provisions hereof, (f) no
litigation is pending or threatened against the Pledgor, which if adversely
determined, would have a material adverse effect against the Pledgor or the
Pledgee's rights in respect of the Shares, (g) that the Pledgor agrees to defend
the Pledgee's title in the Shares and the security interest therein against any
and all claims and demands, and (h) this Agreement constitutes the legal, valid
and binding obligation of the Pledgor, enforceable against the Pledgor in
accordance with its terms.

        4.2 If any adverse claim is asserted in respect of the Shares or any
portion thereof, except as such may arise from the wanton, reckless or
unauthorized acts of the Pledgee, the Pledgor agrees to indemnify the Pledgee
and hold the Pledgee harmless from and against any reasonable liabilities or
damages, and reasonable attorney's fees incurred by the Pledgee in exercising
any right, power or remedy of the Pledgee hereunder.

     5. Voting of Collateral. While Pledgor is not in default hereunder, Pledgor
        --------------------
may vote the Shares, provided that said voting shall be in conformity with the
Pledgor's performance under this Agreement and the Note.

     6. Dividends and Other Distributions. While Pledgor is not in default
        ---------------------------------
hereunder, Pledgor may receive all cash dividends, payments of principal and
interest, and other cash distributions payable with respect to Shares, provided,
                                                                       --------
however, that Pledgor shall immediately inform Pledgee of the receipt of any
-------
such dividend, payment or other distribution and shall hold the amount thereof
in trust for Pledgee unless and until Pledgee shall in writing release Pledgor
from such trust. Pledgor shall cause all non-cash dividends and distributions
with respect to Shares to be distributed directly to Pledgee, to be held by
Pledgee as additional Shares, and if any such distribution is made to Pledgor he
shall receive such distribution in trust for Pledgee and shall immediately
transfer it to Pledgee.

     7. Pledgor's Default. Pledgor shall be in default hereunder upon the
        -----------------
occurrence of any of the following events ("Defaults"):

        (a) Any event of default shall occur under the Note;

        (b) If any lien, encumbrance or adverse claim of any nature whatsoever
is asserted with respect to any Shares (except pursuant to this Pledge
Agreement);

        (c) If any warranty of Pledgor hereunder is or shall become false;

                                      -2-

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        (d) If Pledgor fails to fulfill any obligation hereunder;

        (e) If Pledgor fails to pay or perform any of the Obligations when such
payment of performance is due.

     8. Pledgee's Rights upon Default. Upon the occurrence of any default as
        -----------------------------
defined in Section 7 hereof, Pledgee may, if Pledgee so elects in its sole
discretion, take any one or more of the following:

        (a) at any time and from time to time sell, assign and deliver all or
any part of the Shares, or any interest therein, at any public or private sale,
for cash, on credit or for other property, for immediate or future delivery
without any assumption of credit risk, and for such price or prices and on such
terms as Pledgee in its absolute discretion may determine; provided that (i) at
                                                           --------
least ten (10) days' notice of the time and place of any such sale shall be
given to Pledgor, and (ii) in the case of any private sale, such notice shall
also contain the terms of the proposed sale and Pledgee shall sell the Shares
proposed to be sold to any purchaser procured by Pledgor who is ready, willing
and able to purchase, and who prior to the time of such sale tenders the
purchase price of, such Shares on terms more favorable to Pledgee than the terms
contained in such notice; provided, further, the Pledgor acknowledges that the
                          --------  -------
Pledgee may be unable to effect a public sale of all or part of the Shares by
reason of certain prohibitions contained in the Securities Act of 1933, as
amended, and may be compelled to resort to one or more private sales to a
restricted group of purchasers who will be obligated to agree, among other
things, to acquire such securities for their own account, for investment, and
not with a view to the distribution or resale thereof. The Pledgor acknowledges
that any such private sale may be at prices and on terms less favorable to the
seller than if sold at public sales and that private sales shall be deemed to be
made in a commercially reasonable manner notwithstanding that such a private
sale may result in a lower sale price;

        (b) exercise the right to vote, the right to receive cash dividends and
other distributions, and all other rights with respect to the Shares as though
Pledgee were the absolute owner thereof, whether or not such rights were
retained by Pledgor as against Pledgee before default;

        (c) transfer the Shares into the name of the Pledgee and become sole and
absolute owner thereof;

        (d) exercise all other rights available to a secured party under the
Uniform Commercial Code or other applicable law or hereunder; and

        (e) the rights and remedies available pursuant to the Agreement are
cumulative, and not exclusive of any other rights or remedies otherwise
available to the Pledgee.

     9. Application of Sale Proceeds. In the event of a sale of Shares, the
        ----------------------------
proceeds shall first be applied to the payment of the expenses of the sale,
including brokers' commissions, counsel fees, any taxes or other charges imposed
by law upon the Shares or the transfer thereof and all other charges paid or
incurred by Pledgee pertaining to the sale; and, second, to satisfy outstanding
Obligations, in the order in which Pledgee elects in its sole discretion; and,
third, the surplus (if any) shall be paid to Pledgor.

                                      -3-

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         10. Notices. All notices made or required to be made hereunder shall be
             -------
sent by United States first class or certified or registered mail, with postage
prepaid, or delivered by hand to Pledgee or to Pledgor at the addresses first
above written. Notice by mail shall be deemed to have been made on the date when
the notice is deposited in the mail.

         11. Heirs, Successors, Etc. This Agreement and all of its terms and
             ----------------------
provisions shall benefit and bind the heirs, successors, assigns, transferees,
executors and administrators of each of the parties hereto.

         12. Pledgee's Forbearance. Any forbearance, failure or delay by Pledgee
             ---------------------
in exercising any right, power or remedy hereunder shall not be deemed a waiver
of such right, power or remedy. Any single or partial exercise of any right,
power or remedy of Pledgee shall continue in full force and effect until such
right, power or remedy is specifically waived in writing by Pledgee.

         13. Further Assurances. The Pledgor covenants and agrees to execute and
             ------------------
deliver, or cause to be executed or delivered, all such other stock powers,
proxies, instruments, and documents, and will take such other action or actions
as the Pledgee may reasonably request from time to time in order to carry out
the provisions and purposes hereof.

         14. Termination. This Agreement and the pledge and security interest
             -----------
represented hereby shall terminate upon the indefeasible payment in full of the
Note.

         15. Miscellaneous. (a) This Agreement or any part thereof cannot be
             -------------
changed, waived, or amended except by an instrument in writing signed by
Pledgee; and waiver on one occasion shall not operate as a waiver on any other
occasion. (b) The Uniform Commercial Code and other laws of the Commonwealth of
Massachusetts shall govern the construction and enforcement of this Agreement.
(c) If any part of this Agreement or any agreement, document, or instrument
executed in connection herewith shall be deemed invalid or unenforceable by a
court of competent jurisdiction, the remaining provisions shall remain in full
force and effect, and shall continue to be binding upon the parties. (d) This
Agreement may be executed in one or more counterparts, each of which shall
constitute an original, but all of which, when taken together, shall constitute
one and the same instrument.

         16. Jurisdiction. The Pledgor irrevocably submits to the jurisdiction
             ------------
of the courts of the Commonwealth of Massachusetts and the United States
District Court for the District of Massachusetts for the purpose of any suit,
action or other proceeding brought by the Lender arising out of or relating to
this Agreement, and the Pledgor waives and agrees not to assert by way of
motion, as a defense or otherwise in any such suit, action or proceeding, any
claim that the Pledgor is not personally subject to the jurisdiction of the
courts of the Commonwealth of Massachusetts or the United States District Court
for the District of Massachusetts or that the Pledgor's property is exempt or
immune from execution or attachment, either prior to judgment or in aid of
execution, that the suit, action or proceeding is brought in an inconvenient
forum or that the venue of the suit, action or proceeding is improper, or that
this Pledge Agreement or the subject matter hereof may not be enforced in or by
such court.

                                      -4-

<PAGE>

THE PLEDGOR HEREBY WAIVES ANY AND ALL RIGHTS TO A TRIAL BY JURY IN ANY ACTION OR
PROCEEDING IN CONNECTION WITH ALL MATTERS CONTEMPLATED HEREBY AND DOCUMENTS
EXECUTED IN CONNECTION HEREWITH.

         EXECUTED under seal as of the date first above written.

         PLEDGOR:

          /s/ Scott G. Silk
         -------------------------------
         Scott G. Silk

         PLEDGEE:

         ePresence Inc.

          /s/ Richard M. Spaulding
         -------------------------------
         By: Richard M. Spaulding
         Its: Senior Vice President & CFO

                                      -5-<PAGE>

                                                                   Exhibit 10.62

                                 EPRESENCE, INC.
                      NON-QUALIFIED STOCK OPTION AGREEMENT
                      ------------------------------------

1.   Grant of Options. ePresence, Inc., a Massachusetts corporation (the
     ----------------
     "Company"), hereby grants to William P. Ferry (the "Optionee"), an option,
     pursuant to the Company's 2001 Stock Incentive Plan (the "Plan"), to
     purchase an aggregate of 350,000 shares of Common Stock ("Common Stock") of
     the Company at a price of $2.87 per share, purchasable as set forth in and
     subject to the terms and conditions of this option and the Plan. The date
     of grant of this option is October 15, 2001. Except where the context
     otherwise requires, the term "Company" shall include the parent and all
     present and future subsidiaries of the Company as defined in Sections
     424(e) and 424(f) of the Internal Revenue Code of 1986, as amended or
     replaced from time to time (the "Code").

2.   Non-Qualified Stock Option. This option is not intended to qualify as an
     --------------------------
     incentive stock option within the meaning of Section 422 of the Code.

3.   Exercise of Option and Provisions for Termination.
     -------------------------------------------------

     a.  Vesting Schedule.  This option shall vest and become exercisable on the
         ----------------
         first day of each month over 19 months, commencing on June 1, 2002, at
         the rate of 18,750 shares per month for months 1 through 18 inclusive
         and with a final vest of 12,500 shares on December 1, 2003. Except as
         otherwise provided in this Agreement, this option may be exercised
         prior to the tenth anniversary of the date of grant (hereinafter the
         "Expiration Date") . This option may not be exercised at any time on
         or after the Expiration Date. The right of exercise shall be
         cumulative so that if the option is not exercised to the maximum
         extent permissible during any exercise period, it shall be
         exercisable, in whole or in part, with respect to all shares not so
         purchased at any time prior to the Expiration Date or the earlier
         termination of this option.

     b.  Change in Control. Upon the occurrence of a Change in Control, as
         -----------------
         defined in the February 4, 1997 Employment Agreement, as last amended
         as of October 15, 2001, between the Company and the Employee (the
         "Employment Agreement"), this option shall become vested and
         exercisable as to 100% of the number of shares covered hereby that
         would not otherwise then be vested and exercisable as provided for in
         Section 8(b) of the Employment Agreement.

<PAGE>

   c.    Certain Events.  The vesting of this option shall also be subject to
         --------------
         continuation in accordance with the provisions of Section 5 of the
         Employment Agreement.

   d.    Exercise Procedure. Subject to the conditions set forth in this
         ------------------

         Agreement, this option shall be exercised by the Optionee's delivery
         of written notice of exercise to the Treasurer of the Company,
         specifying the number of shares to be purchased and the purchase price
         to be paid therefore and accompanied by payment in full in accordance
         with Section 4.

   e.    Continuous Employment Required.  Except as otherwise provided in this
         ------------------------------
         Section 3, this option may not be exercised unless Optionee, at the
         time he exercises this option, is, and has been at all times since the
         date of grant of this option, an employee of the Company. For all
         purposes of this option, (i) "employment" shall be defined in
         accordance with the provisions of Section 1.421-7(h) of the Income Tax
         Regulations or any successor regulations, and (ii) if this option
         shall be assumed or a new option substituted therefore in a
         transaction to which Section 424(a) of the Code applies, employment by
         such assuming or substituting corporation (hereinafter called the
         "Successor Corporation") shall be considered for all purposes of this
         option to be employment by the Company.

   f.    Exercise Period Upon Termination of Employment.  If the Optionee ceases
         ----------------------------------------------
         to be employed by the Company for any reason, then, except as provided
         in paragraphs (g) and (h) below, the right to exercise this option
         shall terminate three months after the later of cessation of
         employment or cessation of vesting (but in no event after the
         Expiration Date), provided that this option shall be exercisable only
                           -------- ----
         to the extent that the Optionee was entitled to exercise this option
         on the date of such cessation. The Company's obligation to deliver
         shares upon the exercise of this option shall be subject to the
         satisfaction of all applicable federal, state and local income and
         employment tax withholding requirements, arising by reason of this
         option being treated as a non-statutory option or otherwise.

   g.    Exercise Period Upon Death or Disability.  If the Optionee dies or
         ----------------------------------------
         becomes disabled (within the meaning of Section 22(e)(3) of the Code)
         prior to the Expiration Date while he is an employee of the Company,
         or if the Optionee dies within three months after the Optionee ceases
         to be an employee of the Company (other than as a result of a
         discharge for "cause" as specified in paragraph (h) below), this
         option shall become exercisable within the period of one year
         following the date of death or disability of the Optionee (but in no
         event after the Expiration Date), by the Optionee or by the person to
         whom this option is transferred by will or the laws of descent and
         distribution. Notwithstanding the immediately preceding

                                       2

<PAGE>

          sentence, if the Optionee dies or becomes disabled during a vesting
          continuation period under Paragraph 3 (c) above and prior to the
          Expiration Date, this option shall become exercisable within the
          period of one year following the cessation of such vesting (but in no
          event after the Expiration Date) as to only such options that become
          exercisable by the Optionee during such vesting continuation period,
          by the Optionee or by the person to whom this option is transferred by
          will or the laws of descent and distribution. This option shall be
          exercisable only to the extent that this option was exercisable by the
          Optionee on the date of his cessation of employment and/or cessation
          of vesting, as the case may be. Except as otherwise indicated by the
          context, the term "Optionee", as used in this option, shall be deemed
          to include the estate of the Optionee or any person who acquires the
          right to exercise this option by bequest or inheritance or otherwise
          by reason of the death of the Optionee.

     h.   Exercise Period Upon Discharge for Cause. If the Optionee, prior to
          ----------------------------------------
          the Expiration Date, ceases his employment with the Company because he
          is discharged for "cause" (as defined in Section 5 (b) (1) and 5 (b)
          (2) of the Employment Agreement), the right to exercise this option
          shall terminate 30 days after such cessation of employment.

4.   Payment of Purchase Price.
     -------------------------

     a.   Method of Payment.  Payment of the purchase price for shares purchased
          -----------------
          upon exercise of this option shall be made by delivery of cash or
          check in the amount equal to the exercise price of such options or,
          with the prior consent of the Company (which may be withheld in its
          sole discretion), by (A) delivery of shares of Common Stock owned by
          the Optionee for at least six months, valued at their fair market
          value, as determined in (b) below, (B) delivery of a promissory note
          of the Optionee to the Company on terms determined by the Compensation
          Committee of the Company's Board of Directors (the "Compensation
          Committee"), (C) delivery of an irrevocable undertaking by a broker to
          deliver promptly to the Company sufficient funds to pay the exercise
          price or delivery of irrevocable instructions to a broker to deliver
          promptly to the Company cash or a check sufficient to pay the exercise
          price, (D) payment of such other lawful consideration as the
          Compensation Committee may determine, or (E) any combination of the
          foregoing.

     b.   Valuation of Shares or Other Non-Cash Consideration Tendered in
          ---------------------------------------------------------------
          Payment of Purchase Price. For the purposes hereof, the fair market
          -------------------------
          value of any share of the Company's Common Stock or other non-cash
          consideration which may be delivered to the Company in exercise of
          this option shall be determined in good faith or in the manner
          determined by the Compensation Committee from time to time.

                                       3

<PAGE>

     c.   Delivery of Shares Tendered in Payment of Purchase Price. If the
          --------------------------------------------------------
          Optionee exercises options by delivery of shares of Common stock of
          the Company, the certificate or certificates representing the shares
          of Common Stock of the Company to be delivered shall be duly executed
          in blank by the Optionee or shall be accompanied by a stock power duly
          executed in blank suitable for purposes of transferring such shares to
          the Company. Fractional shares of Common Stock of the Company will not
          be accepted in payment of the purchase price of shares acquired upon
          exercise of this option.

     d.   Restrictions on Use of Option Stock. Notwithstanding the foregoing, no
          -----------------------------------
          shares of Common Stock of the Company may be tendered in payment of
          the purchase price of shares purchased upon exercise of this option if
          the shares to be so tendered were acquired within six months before
          the date of such tender through the exercise of this option or any
          other stock option or restricted stock agreement.

5.   Delivery of Shares; Compliance with Securities Laws, etc. The Company will
     ---------------------------------------------------------
     not be obligated to deliver any shares of Common Stock or to remove
     restriction from shares previously delivered (i) until all conditions of
     the option have been satisfied or removed, (ii) until, in the opinion of
     Company's counsel, all applicable federal and state laws and regulations
     have been complied with, (iii) if the outstanding Common Stock is at the
     time listed on any stock exchange, until the shares to be delivered have
     been listed or authorized to be listed on such exchange upon official
     notice of notice of issuance, and (iv) until all other legal matters in
     connection with the issuance and delivery of such shares have been approved
     by the Company's counsel.

6.   Non-transferability of Option. This option is personal and no rights
     -----------------------------
     granted hereunder may be transferred, assigned, pledged or hypothecated in
     any way (whether by operation of law or otherwise) nor shall any such
     rights be subject to execution, attachment or similar process, except that
     this option may be transferred (i) by will or the laws of descent and
     distribution, or (ii) pursuant to a qualified domestic relations order as
     defined in Section 414(p) of the Code. Upon any attempt to transfer,
     assign, pledge, hypothecate or otherwise dispose of this option or of such
     rights contrary to the provisions hereof, or upon the levy of any
     attachment or similar process upon this option or such rights, this option
     and such rights shall, at the election of the Company, become null and
     void.

7.   No Special Employment or Similar Rights. Nothing contained in this option
     ---------------------------------------
     shall be construed or deemed by any person under any circumstances to bind
     the Company to continue the employment or other relationship of Optionee
     with the Company for the period within which this option may be exercised.

                                       4

<PAGE>

8.   Rights as a Shareholder. The Optionee shall have no rights as a shareholder
     -----------------------
     with respect to any shares which may be purchased by exercise of this
     option (including, without limitation, any rights to receive dividends or
     non-cash distributions with respect to such shares) unless and until a
     certificate representing such shares is duly issued and delivered to the
     Optionee. No adjustment shall be made for dividends or other rights for
     which the record date is prior to the date such stock certificate is
     issued.

9.   Adjustment Provisions.  In the event that the Compensation Committee, in
     ---------------------
     its sole discretion, determines that any stock dividend, extraordinary cash
     dividend, recapitalization, reorganization, merger, consolidation,
     split-up, spin-off, combination or other similar transaction affects the
     Common Stock such that an adjustment is required in order to preserve the
     benefits or potential benefits intended to be made available under the
     Plan, then the Compensation Committee shall equitably adjust either or both
     (i) the number and kind of shares subject to this option, and (ii) the
     award, exercise or conversion price with respect to the foregoing, and if
     considered appropriate, the Compensation Committee may make provision for a
     cash payment with respect to this option, provided that the number of
     shares subject to this option shall always be a whole number.

10.  Mergers, Consolidation, Distributions, Liquidations, etc.  Subject to the
     ---------------------------------------------------------
     provisions of Section 3(b) above, in the event of a consolidation, merger
     or other reorganization in which all of the outstanding shares of Common
     Stock are exchanged for securities, cash or other property of any other
     corporation or business entity (an "Acquisition") or in the event of a
     liquidation of the Company, the Board of Directors of the Company, or the
     board of directors of any corporation assuming the obligations of the
     Company, may, in its discretion, take any one or more of the following
     actions as to this option: (i) provide that this option shall be assumed,
     or a substantially equivalent option shall be substituted by the acquiring
     or succeeding corporation (or an affiliate thereof) on such terms as the
     Board determines to be appropriate, (ii) upon written notice to the
     Optionee, provide that if unexercised, this option will terminate
     immediately prior to the consummation of such transaction unless exercised
     by the Optionee within a specific period following the date of such notice,
     (iii) in the event of an Acquisition under the terms of which holders of
     the Common Stock of the Company will receive upon consummation thereof a
     cash payment for each share surrendered in the Acquisition (the
     "Acquisition Price"), make or provide for a cash payment to the Optionee
     equal to the difference between (A) the Acquisition Price times the number
     of shares of Common Stock subject to outstanding options (to the extent
     then exercisable at prices not in excess of the Acquisition Price) and (B)
     the aggregate exercise price of all such outstanding options in exchange
     for the termination of such options, and (iv) provide that all or part of
     this option shall become exercisable or realizable in full prior to the
     effective date of such Acquisition.

                                       5

<PAGE>

11.  Withholding Taxes.  The Company's obligation to deliver shares upon the
     -----------------
     exercise of this option shall be subject to the Optionee's satisfaction to
     all applicable federal, state and local income and employment tax
     withholding requirements. The Optionee shall pay to the Company, or make
     provision satisfactory to the Compensation Committee for payment of, any
     taxes required by law to be withheld in respect of options under the Plan
     no later than the date of the event creating the tax liability. In the
     Compensation Committee's discretion, and subject to such conditions as the
     Compensation Committee may establish, such tax obligations may be paid in
     whole or in part in shares of Common Stock, including shares retained from
     the option creating the tax obligation, valued at their fair market value.
     The Company may, to the extent permitted by law, deduct any such tax
     obligations from any payment of any kind otherwise due to the Optionee.

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

     a.   If any terms of this Option Agreement are contrary to or otherwise
          conflict with the terms of the Employment Agreement, the terms of the
          Employment Agreement shall control.

     b.   All notices under this option shall be mailed or delivered by hand to
          the parties at their respective addresses set forth beneath their
          names below or at such other address as may be designated in writing
          by either of the parties to one another.

     c.   This option shall be governed by and construed in accordance with the
          laws of the Commonwealth of Massachusetts.

                                                 EPRESENCE, INC.

                                                 BY: /s/ Richard M. Spaulding
                                                     ---------------------------
                                                     Richard M. Spaulding
                                                     Senior Vice President and
                                                     Chief Financial Officer

                                       6

<PAGE>

                              OPTIONEE'S ACCEPTANCE

         The undersigned hereby accepts the foregoing option and agrees to the
terms and conditions hereof.

                                         OPTIONEE: /s/ William P. Ferry
                                                   -----------------------------
                                                   William P. Ferry

                                         Address:  P.O. Box 638
                                                   Hyannis, MA  02601-0638

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