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                                                                   EXHIBIT 10.65

                             UNCONDITIONAL GUARANTY

        For and in consideration of certain loans by SILICON VALLEY BANK, a
California-chartered bank, with its principal place of business at 3003 Tasman
Drive, Santa Clara, California 95054 and with a loan production office located
at One Newton Executive Park, Suite 200, 2221 Washington Street, Newton,
Massachusetts 02462, doing business under the name "Silicon Valley East"
("Bank") to EPRESENCE, INC., a Massachusetts corporation (hereinafter, the
"Borrower"), which loans were made pursuant to a certain Loan and Security
Agreement between Borrower and Bank dated November 7, 2002, as may be amended
from time to time (hereinafter, the "Agreement"), the undersigned guarantor
EPRESENCE SECURITIES CORPORATION, a Massachusetts corporation with its principal
office at 120 Flanders Road, Westborough, Massachusetts 01581-5013
("Guarantor"), hereby unconditionally and irrevocably guarantees the prompt and
complete payment of all amounts that Borrower owes to Bank and performance by
Borrower of the Agreement and any other agreements now existing or hereafter
arising between Borrower and Bank, as each may be amended from time to time
(collectively referred to as the "Agreements"), in strict accordance with their
respective terms.

        1.      If Borrower does not perform its obligations under the
Agreements, Guarantor will immediately pay all amounts due (including, without
limitation, all principal, interest, and fees) and satisfy all Borrower's
obligations under the Agreements.

        2.      These obligations are independent of Borrower's obligations and
separate actions may be brought against Guarantor (whether action is brought
against Borrower or whether Borrower is joined in the action). Guarantor waives
benefit of any statute of limitations affecting its liability. Guarantor's
liability is not contingent on the genuineness or enforceability of the
Agreements.

        3.      Bank may, without notice to Guarantor and without affecting
Guarantor's obligations under this Guaranty: (a) renew, extend, or otherwise
change the terms of the Agreements; (b) take security for the payment of this
Guaranty or the Agreements; (c) exchange, enforce, waive and release any
security; and (d) apply the security and direct its sale as Bank, in its
discretion, chooses.

        4.      Guarantor waives:

                (a)     Any right to require Bank to: (i) proceed against
        Borrower or any other person; (ii) proceed against or exhaust any
        security; or (iii) pursue any other remedy. Bank may exercise or not
        exercise any right or remedy it has against Borrower or any security it
        holds (including the right to foreclose by judicial or non-judicial
        sale) without affecting Guarantor's liability.

                (b)     Any defenses from disability or other defense of
        Borrower or from the cessation of Borrower's liabilities.

                (c)     Any setoff, defense or counterclaim against Bank.

                (d)     Any defense from the absence, impairment or loss of any
        right of reimbursement or subrogation or any other rights against
        Borrower. Until Borrower's obligations to Bank have been paid, Guarantor
        has no right of subrogation or reimbursement or subrogation or other
        rights against Borrower.

                (e)     Any right to enforce any remedy that Bank has against
        Borrower.

                (f)     Any rights to participate in any security held by Bank.

                (g)     Any demands for performance, notices of nonperformance
        or of new or additional indebtedness. Guarantor is responsible for
        being and keeping itself informed of Borrower's financial condition.
        Unless Guarantor requests particular information, Bank has no duty to
        provide information to Guarantor.

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        5.      Guarantor acknowledges that, to the extent Guarantor has or may
have rights of subrogation or reimbursement against Borrower for claims arising
out of this Guaranty, those rights may be impaired or destroyed if Bank elects
to proceed against any real property security of Borrower by non-judicial
foreclosure. That impairment or destruction could, under certain judicial cases
and based on equitable principles of estoppel, give rise to a defense by
Guarantor against its obligations under this Guaranty. Guarantor waives that
defense and any others arising from Bank's election to pursue non-judicial
foreclosure.

        6.      If Borrower becomes insolvent or is adjudicated bankrupt or
files a petition for reorganization or similar relief under the United States
Bankruptcy Code, or if a petition is filed against Borrower and/or any
obligation under the Agreements is terminated or rejected, or any obligation of
Borrower is modified or if Borrower's obligations are avoided Guarantor's
liability will not be affected and its liability will continue. If Bank must
return any payment because of the insolvency, bankruptcy or reorganization of
Borrower, Guarantor or any other guarantor, this Guaranty will remain effective
or be reinstated.

        7.      Guarantor subordinates any indebtedness of Borrower it holds
to Bank; and Guarantor will collect, enforce and receive payments as Bank's
trustee and will pay Bank those payments without reducing or affecting its
liability under this Guaranty.

        8.      Guarantor will pay Bank's reasonable attorneys' fees and other
costs and expenses incurred enforcing this Guaranty. This Guaranty may not be
waived, revoked or amended without Bank's prior written consent. If any
provision of this Guaranty is unenforceable, all other provisions remain
effective. This Guaranty represents the entire agreement among the parties about
this guaranty. No prior dealings, no usage of trade, and no parol or extrinsic
evidence may supplement or vary this Guaranty. Bank may assign this Guaranty.
This Guaranty benefits Bank, its successors and assigns. This Guaranty is in
addition to any other guaranties Bank obtains.

        9.      Guarantor represents and warrants that (i) it has taken all
action necessary to authorize execute, deliver and perform this Guaranty; (ii)
execution, delivery and performance of this Guaranty do not conflict with any
organizational documents or agreements to which it is a party; and (iii) this
Guaranty is a valid and binding obligation, enforceable against Guarantor
according to its terms.

        10.     Guarantor will do all of the following:

                (a)     Maintain its corporate existence, remain in good
        standing in its state of incorporation, and continue to qualify in each
        jurisdiction in which the failure to qualify could have a material
        adverse effect on the financial condition, operations or business.
        Maintain all licenses, approvals, and agreements, the loss of which
        could have a material adverse effect on its financial condition,
        operations or business.

                (b)     Comply with all statutes and regulations if
        non-compliance could adversely affect its financial condition,
        operations or business.

                (c)     Execute other instruments and take action Bank
        reasonably requests to effect the purposes of this Agreement.

        11.     Guarantor hereby grants to Bank, a lien, security interest and
right of setoff as security for all obligations to Bank, whether now existing
or hereafter arising upon and against all deposits, credits, collateral and
property, now or hereafter in the possession, custody, safekeeping or control
of Bank or any entity under the control of Bank or in transit to any of them. At
any time after the occurrence and during the continuance of an Event of Default
(as defined in the Agreement), without demand or notice, Bank may set off the
same or any part thereof and apply the same to any liability or obligation of
Guarantor even though unmatured and regardless of the adequacy of any other
collateral securing the loan. ANY AND ALL RIGHTS TO REQUIRE BANK TO EXERCISE ITS
RIGHTS OR REMEDIES WITH RESPECT TO ANY OTHER COLLATERAL WHICH SECURES THE LOAN,
PRIOR TO

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EXERCISING ITS RIGHT OF SETOFF WITH RESPECT TO SUCH DEPOSITS, CREDITS OR OTHER
PROPERTY OF THE GUARANTOR, ARE HEREBY KNOWINGLY, VOLUNTARILY AND IRREVOCABLY
WAIVED.

        12.     Massachusetts law governs this Guaranty without regard to
principles of conflicts of law. Guarantor and Bank each submit to the exclusive
jurisdiction of the State and Federal courts in Massachusetts; provided,
however, that if for any reason Bank cannot avail itself of such courts in the
Commonwealth of Massachusetts, Guarantor accepts jurisdiction of the courts and
venue in Santa Clara County, California. NOTWITHSTANDING THE FOREGOING, THE BANK
SHALL HAVE THE RIGHT TO BRING ANY ACTION OR PROCEEDING AGAINST THE GUARANTOR OR
ITS PROPERTY IN THE COURTS OF ANY OTHER JURISDICTION WHICH THE BANK DEEMS
NECESSARY OR APPROPRIATE IN ORDER TO REALIZE ON THE COLLATERAL OR TO OTHERWISE
ENFORCE THE BANK'S RIGHTS AGAINST THE GUARANTOR OR ITS PROPERTY. GUARANTOR AND
BANK EACH WAIVE THEIR RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION
ARISING OUT OF OR BASED UPON THIS AGREEMENT, THE LOAN DOCUMENTS OR ANY
CONTEMPLATED TRANSACTION, INCLUDING CONTRACT, TORT, BREACH OF DUTY AND ALL OTHER
CLAIMS. THIS WAIVER IS A MATERIAL INDUCEMENT FOR BOTH PARTIES TO ENTER INTO THIS
AGREEMENT. EACH PARTY HAS REVIEWED THIS WAIVER WITH ITS COUNSEL.

        IN WITNESS WHEREOF, the undersigned Guarantor has executed this Guaranty
as an instrument under seal under the laws of the Commonwealth of Massachusetts,
as of this 7th day of November, 2002.

                                                EPRESENCE SECURITIES CORPORATION

                                                By: /s/ Richard M. Spaulding
                                                   -----------------------------

                                                Title: Clerk
                                                      --------------------------

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                                                                   Exhibit 10.66

                                 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 120,000 shares of Common Stock ("Common Stock") of
     the Company at a price of $1.97 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 February 7, 2003. 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. 20,000 shares will vest immediately, the remaining
          option shall vest and become exercisable on the first day of each
          month over 10 months, commencing on March 1, 2003, at the rate of
          10,000 shares per month. 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.

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     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

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          or by the person to whom this option is transferred by will or the
          laws of descent and distribution. Notwithstanding the immediately
          preceding 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

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          option shall be determined in good faith or in the manner determined
          by the Compensation Committee from time to time.

     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

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     Company to continue the employment or other relationship of Optionee with
     the Company for the period within which this option may be exercised.

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

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     become exercisable or realizable in full prior to the effective date of
     such Acquisition.

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

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