Document:

EXHIBIT 10.36
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              AMENDMENT TO EXCHANGE AGREEMENT, SECURITIES PURCHASE
              ----------------------------------------------------
                   AGREEMENT AND REGISTRATION RIGHTS AGREEMENT
                   -------------------------------------------

           THIS AMENDMENT to the Exchange Agreement, Securities Purchase
Agreement and the Registration Rights Agreement is made as of the 28th day of
June, 2001 by and between ON Technology Corporation, a Delaware corporation (the
"Company"), and Castle Creek Technology Partners LLC ("CC").

           WHEREAS, the Company and CC are parties to that certain Exchange
Agreement between the Company and CC dated December 18, 2000 (the "Exchange
Agreement"); and

           WHEREAS, the Company and CC are parties to that certain Securities
Purchase Agreement between the Company and CC dated December 29, 1999 (the
"Securities Purchase Agreement"); and

           WHEREAS, the Company and CC are parties to that certain Registration
Rights Agreement between the Company and CC dated December 29, 1999, as amended
by the Exchange Agreement (the "Registration Rights Agreement").

           NOW, THEREFORE, in consideration of the mutual covenants contained
herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree to amend the
Exchange Agreement, the Securities Purchase Agreement and the Registration
Rights Agreement as follows:

           1.    Section 6(b) of the Exchange Agreement is hereby deleted in its
entirety and replaced with the following:

                 "(b) The Company has caused the Registration Statement filed
                 pursuant to the preceding Section 6(a) (the "Registration
                 Statement") to become effective, and covenants and agrees to
                 use best efforts to take all actions reasonably required to
                 maintain the effectiveness of the Registration Statement for a
                 period of two years after its effective date."

           2.    Section 2.3 of the Registration Rights Agreement is hereby
deleted in its entirety and replaced with the following:

                 "The Company has caused the Registration Statement filed
                 pursuant to Section 2.1(a) to become effective, and covenants
                 and agrees to use best efforts to take all actions reasonably
                 required to maintain the effectiveness of such Registration
                 Statement for a period of two years after its effectiveness."

           3.    The first sentence of Section 3.1 of the Registration Rights
Agreement is hereby deleted in its entirety and replaced with the following:
<PAGE>

                 "The Company shall prepare and promptly file with the SEC each
                 Registration Statement required by Section 2.1, and cause each
                 such Registration Statement relating to the Registrable
                 Securities to become effective as soon as practicable after
                 such filing, and use best efforts to take all actions
                 reasonably necessary to keep the Registration Statement
                 effective pursuant to Rule 415 and available for use at all
                 times until such date as is the earlier of (i) the date on
                 which all of the Registrable Securities have been sold ( and no
                 further Registrable Securities may be issued in the future) and
                 (ii) the date on which all of the Registrable Securities (in
                 the reasonable opinion of counsel to the Initial Purchasers)
                 may be immediately sold to the public without registration and
                 without restriction as to the number of Registrable Securities
                 to be sold, whether pursuant to Rule 144 or otherwise (the
                 "Registration Period")."

           4.    The first sentence of Section 3.2 of the Registration Rights
Agreement is hereby deleted in its entirety and replaced with the following:

                 "The Company shall prepare and file with the SEC such
                 amendments (including post-effective amendments) and
                 supplements to a Registration Statement and the prospectus used
                 in connection with each Registration Statement as is consistent
                 with the Company's obligation to use best efforts to take all
                 actions reasonably required to keep such Registration Statement
                 effective and available for use at all times during the
                 Registration Period, and, during such period, comply with the
                 provisions of the Securities Act with respect to the
                 disposition of all Registrable Securities of the Company
                 covered by such Registration Statement until the termination of
                 the Registration Period or, if earlier, such time as all of
                 such Registrable Securities have been disposed of in accordance
                 with the intended methods of disposition by the seller or
                 sellers thereof as set forth in such Registration Statement."

           5.    The last sentence of Section 3.2 of the Registration Rights
Agreement is hereby deleted in its entirety and replaced with the following:

                 "The Company shall use best efforts to take all actions
                 reasonably required to cause such amendment and/or new
                 Registration Statement to become effective as soon as
                 practicable following the filing thereof."

           6.    The first sentence of Section 3.4 of the Registration Rights
Agreement is hereby deleted in its entirety and replaced with the following:

                 "The Company shall (a) use best efforts to take all actions
                 reasonably required to register and qualify the Registrable
                 Securities covered by each Registration Statement under
                 securities laws of such jurisdictions in the United States as
                 each Purchaser who holds (or has the right to hold) Registrable
                 Securities being offered reasonably requests, (b) prepare and
                 file in those jurisdictions such amendments (including
                 post-effective amendments) and supplements to such
                 registrations and qualifications are consistent with the
                 Company's obligation to use best efforts to
<PAGE>

                 take all actions reasonably required to maintain the
                 effectiveness and availability for use thereof during the
                 applicable Registration Period, (c) use best efforts to take
                 such other actions as may be reasonably required to maintain
                 such registrations and qualifications in effect at all times
                 during the applicable Registration Period, and (d) use best
                 efforts to take all other actions reasonably required to
                 qualify the Registrable Securities for sale in such
                 jurisdictions; provided, however, that the Company shall not be
                 required in connection therewith or as a condition thereto to
                 (i) qualify to do business in any jurisdiction where it would
                 not otherwise be required to qualify but for this Section 3.4,
                 (ii) subject itself to general taxation in any such
                 jurisdiction, (iii) file a general consent to service of
                 process in any such jurisdiction, (iv) provide any undertakings
                 that cause the Company material expense or burden, or (v) make
                 any change in its charter or by-laws, which in each case the
                 board of directors of the Company determines to be contrary to
                 the best interests of the Company and its stockholders."

           7.    The Section 3.7 of the Registration Rights Agreement is hereby
deleted in its entirety and replaced with the following:

                 "The Company shall use its best efforts to take all actions
                 reasonably required to prevent the issuance of any stop order
                 or other suspension of effectiveness of a Registration
                 Statement, and, if such an order is issued, to obtain the
                 withdrawal of such order at the earliest practicable time and
                 the Company shall immediately notify by facsimile each
                 Purchaser (at the facsimile number for each Purchaser set forth
                 on the signature page hereto) who holds Registrable Securities
                 (or, in the event of any underwritten offering, the managing
                 underwriters) of the issuance of such order and the resolution
                 thereof."

           8.    The second sentence of Section 4.9 of the Securities Purchase
Agreement is hereby deleted in its entirety.

           9.    Except as expressly set forth in this Amendment, each of the
Exchange Agreement, the Securities Purchase Agreement and the Registration
Rights Agreement shall remain in full force and effect and shall not be altered,
amended or modified. In the event of a conflict between the terms of this
Amendment and any of the terms of the Exchange Agreement, Registration Rights
Agreement, the Exchange Warrant or the Securities Purchase Agreement, the terms
of this Amendment shall prevail.

           10.   Capitalized terms used herein but not otherwise defined shall
have the meanings ascribed to such terms in the Exchange Agreement.

           11.   This Amendment may be executed in counterparts, all of which
taken together shall constitute one and the same agreement.

                  [REMAINDER OF PAGE LEFT INTENTIONALLY BLANK]
<PAGE>

           IN WITNESS WHEREOF, the parties hereto have executed this Amendment
on the date first above written.

                                           ON TECHNOLOGY CORPORATION

                                           By:_________________________________
                                           Name:_______________________________
                                           Title:______________________________

                                           CASTLE CREEK TECHNOLOGY
                                           PARTNERS LLC

                                           By:_________________________________
                                           Name:_______________________________
                                           Title:______________________________EXHIBIT 10.1
                                                                   ------------

          BOSTON SCIENTIFIC CORPORATION 401(K) RETIREMENT SAVINGS PLAN
                                     FORM OF
                                 FIFTH AMENDMENT
                                 ---------------

           Pursuant to Section 10.1 of the Boston Scientific Corporation 401(k)
Retirement Savings Plan (the "Plan"), Boston Scientific Corporation hereby
amends the Plan, effective as of January 1, 2001 as follows:

           1.   Section 3.7A of the Plan is hereby amended by inserting the
                following new subsection (c) thereunder:

                     "(c) The Participating Employers shall contribute to the
                Plan such other amounts as the Board of Directors determines on
                behalf of certain eligible Participants as set forth on Schedule
                C. Such contributions shall be made in cash and shall be
                allocated to an employer contribution Account of each eligible
                Participant as set forth on Schedule C."

           2.   Article 6 of the Plan is hereby amended by inserting the
                following new section 6.2C:

                "6.2C. WITHDRAWAL OF EMPLOYEE CONTRIBUTIONS. A Participant who
           is an Employee may make a withdrawal from his or her Employee
           Contribution Account for any reason upon such prior notice and in
           accordance with such procedures as the Committee may prescribe. Any
           such withdrawal shall be in the amount specified by the Participant
           in accordance with procedures prescribed by the Committee, up to the
           value of the Participant's Employee Contribution Account determined
           as of the Valuation Date that authorized distribution directions are
           received by the Trustee. Payment to the Participant shall be made as
           soon as practicable following such receipt of distribution
           directions."

           3.   Section 14.17 of the Plan is amended by deleting such section in
                its entirety and by substituting the following therefor:

           "14.17 'ENTRY DATE' means the first day of each pay period during the
           Plan Year."

           4.   Schedule C of the Plan is hereby amended by adding the following
                at the end thereof:

                                   "Special Year 2000 Contributions

                               Pursuant to Section 3.7A(c), for the 2000 Plan
                     Year, the Participating Employers made a special
                     contribution on behalf of certain Participants (as listed
                     below) in the amounts indicated:

                     Participant                       Amount

                     -----------------------           $-----------

                     -----------------------           $-----------

                     -----------------------           $-----------

                     -----------------------           $-----------

                     -----------------------           $-----------

                     -----------------------           $-----------

           5.   It is hereby reaffirmed that the Plan is renamed the Boston
                Scientific Corporation 401(k) Retirement Savings Plan and all
                references in the Plan to the "Boston Scientific Corporation

<PAGE>

                401(k) Savings Plan" are hereby changed to the "Boston
                Scientific Corporation 401(k) Retirement Savings Plan."

           IN WITNESS WHEREOF, Boston Scientific Corporation has caused this
Fifth Amendment to be executed in its name and on its behalf this __ day of
July, 2001.

                                      BOSTON SCIENTIFIC CORPORATION

                                      By:  _______________________________

                                      Title:  ______________________________

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