SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                            -----------------------

                                  SCHEDULE 13G

                                 (Rule 13d-102)

            INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
          TO RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED
                           PURSUANT TO RULE 13d-2(b)
                               (Amendment No. 1)1


                     InterNAP Network Services Corporation
-------------------------------------------------------------------------------
                                (Name of Issuer)


                    Common Stock, Par Value $0.001 per Share
-------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   45885A102
-------------------------------------------------------------------------------
                                 (CUSIP Number)


                               September 29, 1999
-------------------------------------------------------------------------------
            (Date of Event Which Requires Filing of this Statement)


     Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

     [ ] Rule 13d-1(b)
     [ ] Rule 13d-1(c)
     [X] Rule 13d-1(d)

     ---------------
     1 The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



<PAGE>


-------------------                                           ------------------
CUSIP No. 45885A102                   13G                     Page 2 of 13 Pages
-------------------                                           ------------------

--------------------------------------------------------------------------------
   1.    NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

         MORGAN STANLEY DEAN WITTER & CO.
--------------------------------------------------------------------------------
   2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a)[ ]
                                                                          (b)[ ]
--------------------------------------------------------------------------------
   3.    SEC USE ONLY

--------------------------------------------------------------------------------
   4.    CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
--------------------------------------------------------------------------------

      NUMBER OF                   5.    SOLE VOTING POWER                -0-
        SHARES
     BENEFICIALLY                 ----------------------------------------------
       OWNED BY                   6.    SHARED VOTING POWER      14,534,026
         EACH
      REPORTING                   ---------------------------------------------
     PERSON WITH                  7.    SOLE DISPOSITIVE POWER           -0-

                                  ----------------------------------------------
                                  8.    SHARED DISPOSIVE POWER   14,534,026

--------------------------------------------------------------------------------
   9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         14,534,026
--------------------------------------------------------------------------------
  10.    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES               [ ]
         CERTAIN SHARES*

--------------------------------------------------------------------------------
  11.    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         9.8%
--------------------------------------------------------------------------------
  12.    TYPE OF REPORTING PERSON*

         CO
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                   Page 2 of 13


<PAGE>


-------------------                                           ------------------
CUSIP No. 45885A102                   13G                     Page 3 of 13 Pages
-------------------                                           ------------------

--------------------------------------------------------------------------------
   1.    NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

         MORGAN STANLEY VENTURE CAPITAL III, INC.
--------------------------------------------------------------------------------
   2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a)[ ]
                                                                          (b)[ ]
--------------------------------------------------------------------------------
   3.    SEC USE ONLY

--------------------------------------------------------------------------------
   4.    CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
--------------------------------------------------------------------------------

      NUMBER OF                   5.    SOLE VOTING POWER                -0-
        SHARES
     BENEFICIALLY                 ----------------------------------------------
       OWNED BY                   6.    SHARED VOTING POWER      14,534,026
         EACH
      REPORTING                   ---------------------------------------------
     PERSON WITH                  7.    SOLE DISPOSITIVE POWER           -0-

                                  ----------------------------------------------
                                  8.    SHARED DISPOSIVE POWER   14,534,026

--------------------------------------------------------------------------------
   9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         14,534,026
--------------------------------------------------------------------------------
  10.    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES               [ ]
         CERTAIN SHARES*

--------------------------------------------------------------------------------
  11.    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         9.8%
--------------------------------------------------------------------------------
  12.    TYPE OF REPORTING PERSON*

         CO, IA
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                   Page 3 of 13



<PAGE>


-------------------                                           ------------------
CUSIP No. 45885A102                   13G                     Page 4 of 13 Pages
-------------------                                           ------------------

--------------------------------------------------------------------------------
   1.    NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

         MORGAN STANLEY VENTURE PARTNERS III, L.L.C.
--------------------------------------------------------------------------------
   2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a)[ ]
                                                                          (b)[ ]
--------------------------------------------------------------------------------
   3.    SEC USE ONLY

--------------------------------------------------------------------------------
   4.    CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
--------------------------------------------------------------------------------

      NUMBER OF                    5.   SOLE VOTING POWER                -0-
        SHARES
     BENEFICIALLY                  ---------------------------------------------
       OWNED BY                    6.   SHARED VOTING POWER      14,347,679
         EACH
      REPORTING                   ---------------------------------------------
     PERSON WITH                  7.    SOLE DISPOSITIVE POWER           -0-

                                  ----------------------------------------------
                                  8.    SHARED DISPOSIVE POWER   14,347,679

--------------------------------------------------------------------------------
   9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         14,347,679
--------------------------------------------------------------------------------
  10.    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES               [ ]
         CERTAIN SHARES*

--------------------------------------------------------------------------------
  11.    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         9.7%
--------------------------------------------------------------------------------
  12.    TYPE OF REPORTING PERSON*

         OO, IA
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                   Page 4 of 13



<PAGE>


-------------------                                           ------------------
CUSIP No. 45885A102                   13G                     Page 5 of 13 Pages
-------------------                                           ------------------

--------------------------------------------------------------------------------
   1.    NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

         MORGAN STANLEY VENTURE PARTNERS III, L.P.
--------------------------------------------------------------------------------
   2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a)[ ]
                                                                          (b)[ ]
--------------------------------------------------------------------------------
   3.    SEC USE ONLY

--------------------------------------------------------------------------------
   4.    CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
--------------------------------------------------------------------------------

      NUMBER OF                   5.   SOLE VOTING POWER                -0-
        SHARES
     BENEFICIALLY                 ----------------------------------------------
       OWNED BY                   6.    SHARED VOTING POWER      12,588,295
         EACH
      REPORTING                   ---------------------------------------------
     PERSON WITH                  7.    SOLE DISPOSITIVE POWER           -0-

                                  ----------------------------------------------
                                  8.    SHARED DISPOSIVE POWER   12,588,295

--------------------------------------------------------------------------------
   9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         12,588,295
--------------------------------------------------------------------------------
  10.    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES               [ ]
         CERTAIN SHARES*

--------------------------------------------------------------------------------
  11.    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         8.5%
--------------------------------------------------------------------------------
  12.    TYPE OF REPORTING PERSON*

         PN
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                   Page 5 of 13



<PAGE>


-------------------                                           ------------------
CUSIP No. 45885A102                   13G                     Page 6 of 13 Pages
-------------------                                           ------------------

--------------------------------------------------------------------------------
   1.    NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

         MORGAN STANLEY VENTURE INVESTORS III, L.P.
--------------------------------------------------------------------------------
   2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a)[ ]
                                                                          (b)[ ]
--------------------------------------------------------------------------------
   3.    SEC USE ONLY

--------------------------------------------------------------------------------
   4.    CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
--------------------------------------------------------------------------------

      NUMBER OF                   5.    SOLE VOTING POWER                -0-
        SHARES
     BENEFICIALLY                 ----------------------------------------------
       OWNED BY                   6.    SHARED VOTING POWER       1,208,647
         EACH
      REPORTING                   ---------------------------------------------
     PERSON WITH                  7.    SOLE DISPOSITIVE POWER           -0-

                                  ----------------------------------------------
                                  8.    SHARED DISPOSIVE POWER    1,208,647

--------------------------------------------------------------------------------
   9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         1,208,647
--------------------------------------------------------------------------------
  10.    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES               [ ]
         CERTAIN SHARES*

--------------------------------------------------------------------------------
  11.    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         0.8%
--------------------------------------------------------------------------------
  12.    TYPE OF REPORTING PERSON*

         PN
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                   Page 6 of 13

<PAGE>


-------------------                                           ------------------
CUSIP No. 45885A102                   13G                     Page 7 of 13 Pages
-------------------                                           ------------------

--------------------------------------------------------------------------------
   1.    NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

         THE MORGAN STANLEY VENTURE PARTNERS ENTREPRENEUR, FUND L.P.
--------------------------------------------------------------------------------
   2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a)[ ]
                                                                          (b)[ ]
--------------------------------------------------------------------------------
   3.    SEC USE ONLY

--------------------------------------------------------------------------------
   4.    CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
--------------------------------------------------------------------------------

      NUMBER OF                   5.    SOLE VOTING POWER                -0-
        SHARES
     BENEFICIALLY                 ----------------------------------------------
       OWNED BY                   6.    SHARED VOTING POWER         550,737
         EACH
      REPORTING                   ---------------------------------------------
     PERSON WITH                  7.    SOLE DISPOSITIVE POWER           -0-

                                  ----------------------------------------------
                                  8.    SHARED DISPOSIVE POWER      550,737

--------------------------------------------------------------------------------
   9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         550,737
--------------------------------------------------------------------------------
  10.    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES               [ ]
         CERTAIN SHARES*

--------------------------------------------------------------------------------
  11.    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         0.4%
--------------------------------------------------------------------------------
  12.    TYPE OF REPORTING PERSON*

         PN
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                   Page 7 of 13


<PAGE>


Item 1(a).  Name of Issuer:

     InterNAP Network Services Corporation

Item 1(b).  Address of Issuer's Principal Executive Offices:

     601 Union Street, Suite 1000, Seattle, Washington 98101

Item 2(a).  Name of Person Filing:

     This statement is filed on behalf of the persons identified below. In
accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), each person filing this statement acknowledges
that it is responsible for the completeness and accuracy of the information
concerning that person but is not responsible for the completeness or accuracy
of the information concerning the other persons making the filing, unless such
person knows or has reason to believe that such information is inaccurate.

     Morgan Stanley Dean Witter & Co. ("MSDW")

     Morgan Stanley Venture Capital III, Inc. ("MSVC III, Inc.")

     Morgan Stanley Venture Partners III, L.L.C. ("MSVP III, L.L.C.")

     Morgan Stanley Venture Partners III, L.P. ("MSVP III, L.P.")

     Morgan Stanley Venture Investors III, L.P. ("MSVI III, L.P.")

     The Morgan Stanley Venture Partners Entrepreneur Fund, L.P. (the
"Entrepreneur Fund")

Item 2(b).  Address of Principal Business Office or, if None, Residence:

     The address of the principal business office of MSVC III, Inc., MSVP III,
L.L.C., MSVP III, L.P., MSVI III, L.P. and the Entrepreneur Fund is:

     1221 Avenue of the Americas
     New York, New York 10020

     The address of the principal business office of MSDW is:

     1585 Broadway
     New York, New York 10036

Item 2(c).  Citizenship:

     The citizenship of MSDW, MSVC III, Inc., MSVP III, L.L.C., MSVP III, L.P.,
MSVI III, L.P. and the Entrepreneur Fund is Delaware.

Item 2(d).  Title of Class of Securities:

     This statement relates to the Company's Common Stock, par value $0.001 per
share.


                                  Page 8 of 13



<PAGE>



Item 2(e). CUSIP Number:

         45885A102

Item 3. If this Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or
     (c), Check Whether the Person Filing is a:

     (a)  [ ] Broker or dealer registered under Section 15 of the Exchange Act;

     (b)  [ ] Bank as defined in Section 3(a)(6) of the Exchange Act;

     (c)  [ ] Insurance company as defined in Section 3(a)(19) of the Exchange
              Act;

     (d)  [ ] Investment company registered under Section 8 of the Investment
              Company Act;

     (e)  [ ] An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

     (f)  [ ] An employee benefit plan or endowment fund in accordance with
              Rule 13d-1(b)(1)(ii)(F);

     (g)  [ ] A parent holding company or control person in accordance with
              Rule 13d-1(b)(1)(ii)(G);

     (h)  [ ] A savings association as defined in Section 3(b) of the Federal
              Deposit Insurance Act;

     (i)  [ ] A church plan that is excluded from the definition of an
              investment company under Section 3(c)(14) of the Investment
              Company Act;

     (j)  [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

Item 4.   Ownership.

     The filing of this statement should not be construed as an admission by
any person that such person is, for purposes of Section 13(d) or 13(g) of the
Exchange Act, the beneficial owner of any securities covered by this statement,
other than the securities set forth opposite such person's name in the table in
Item 4(c) below.

     (a) Amount beneficially owned:

     As of December 31, 2000: (1) MSVC III, Inc. owned directly 186,347 shares
of Common Stock; (2) MSVP III, L.P. owned directly 12,588,295 shares of Common
Stock, (3) MSVI III, L.P. owned directly 1,208,647 shares of Common Stock; and
(4) the Entrepreneur Fund owned directly 550,737 shares of Common Stock.

     MSVP III, L.L.C., is the General Partner of MSVP III, L.P., MSVI III, L.P.
and the Entrepreneur Fund (collectively, the "Funds") and, as such has the
power to vote or direct the vote and to dispose or direct the disposition


                                  Page 9 of 13



<PAGE>


of all of the shares of Common Stock held by the Funds. MSVC III, Inc. is the
institutional managing member of MSVP III, L.L.C., and, as such, shares,
together with the remaining managing members, the power to direct the actions
of MSVC III, L.L.C. Therefore, MSVC III, Inc. may be deemed to have beneficial
ownership of the 14,347,679 shares of Common Stock held by the Funds in
addition to the 186,347 shares of Common Stock it holds directly. MSDW, as the
sole shareholder of MSVC III, Inc., controls the action of MSVC III, Inc.
Therefore, MSDW may be deemed to have beneficial ownership of the 14,347,679
shares of Common Stock held by the Funds in addition to the 186,347 shares of
Common Stock held directly by MSVC III, Inc.

     (b)  Percent of class: (1)

     Morgan Stanley Dean Witter & Co.                9.8% of the Common Shares

     Morgan Stanley Venture Capital III, Inc.        9.8% of the Common Shares

     Morgan Stanley Venture Partners III, L.L.C.     9.7 % of the Common Shares

     Morgan Stanley Venture Partners III, L.P.       8.5% of the Common Shares

     Morgan Stanley Venture Investors III, L.P.      0.8% of the Common Shares

     The Morgan Stanley Venture Partners             0.4% of the Common Shares
     Entrepreneur Fund, L.P.
---------------
(1)  Based on the 148,191,001 shares of Common Stock reported to be outstanding
     as of September 30, 2000 on the Form 10-Q filed with the SEC, for the
     quarter ended September 30, 2000.

(c)  Number of shares as to which such person has:


<TABLE>
<S>                   <C>                        <C>                       <C>                         <C>

                                   (i)                    (ii)                      (iii)                         (iv)
                       Sole power to vote or to  Shared power to vote or  Sole power to dispose or to    Shared power to dispose or
                             direct to vote         to direct to vote      direct the disposition of    to direct the disposiiton of
                         ----------------------  -----------------------  ---------------------------   ----------------------------
Morgan Stanley Dean               - 0 -                14,534,026                   - 0 -                       14,534,026
Witter & Co.

Morgan Stanley Venture            - 0 -                14,534,026                   - 0 -                       14,534,026
Capital  III, Inc.

Morgan Stanley Venture            - 0 -                14,347,679                   - 0 -                       14,347,679
Partners III, L.L.C.

Morgan Stanley Venture            - 0 -                12,588,295                   - 0 -                       12,588,295
Partners III, L.P.

Morgan Stanley Venture            - 0 -                 1,208,647                   - 0 -                        1,208,647
Investors III, L.P.

The Morgan Stanley                - 0 -                   550,737                   - 0 -                          550,737
Venture Partners
Entrepreneur Fund, L.P.


                                                                  Page 10 of 13
</TABLE>




<PAGE>



Item 5. Ownership of Five Percent or Less of a Class.

     If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following. [ ]

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

     Not applicable

Item 7. Identification and Classification of the Subsidiary Which Acquired the
     Security Being Reported on by the Parent Holding Company or Control
     Person.

     Not applicable

Item 8. Identification and Classification of Members of the Group.

     Not applicable

Item 9. Notice of Dissolution of Group.

     Not applicable

Item 10.  Certifications.

     Not applicable.


                                 Page 11 of 13


<PAGE>


                                   SIGNATURE

     After reasonable inquiry and to the best of the knowledge and belief of
each of the undersigned, each of the undersigned certifies that the information
set forth in this statement is true, complete and correct.


                                 Date: January 26, 2001
                                 MORGAN STANLEY DEAN WITTER & CO.



                                 By: /s/ Peter Vogelsang
                                    --------------------------------------------
                                       Name:  Peter Vogelsang
                                       Title: Authorized Signatory



                                 MORGAN STANLEY VENTURE CAPITAL III,
                                 INC.


                                 By: /s/ Debra Abramovitz
                                    --------------------------------------------
                                       Name:  Debra Abramovitz
                                       Title: Vice President and Treasurer



                                 MORGAN STANLEY VENTURE PARTNERS III,
                                 L.L.C.

                                 By: Morgan Stanley Venture Capital III, Inc.,
                                        as Institutional Managing Member


                                 By: /s/ Debra Abramovitz
                                    --------------------------------------------
                                       Name:  Debra Abramovitz
                                       Title: Vice President and Treasurer


                                 Page 12 of 13



<PAGE>


                                MORGAN STANLEY VENTURE PARTNERS III,
                                L.P.

                                By: Morgan Stanley Venture Partners III, L.L.C.,
                                       as General Partner

                                By: Morgan Stanley Venture Capital III, Inc.,
                                       as Institutional Managing Member of the
                                       General Partner


                                By: /s/ Debra Abramovitz
                                   --------------------------------------------
                                      Name:  Debra Abramovitz
                                      Title: Vice President and Treasurer



                                MORGAN STANLEY VENTURE INVESTORS III,
                                L.P.

                                By: Morgan Stanley Venture Partners III, L.L.C.,
                                       as General Partner

                                By: Morgan Stanley Venture Capital III, Inc.,
                                       as Institutional Managing Member of the
                                       General Partner


                                By: /s/ Debra Abramovitz
                                   --------------------------------------------
                                      Name:  Debra Abramovitz
                                      Title: Vice President and Treasurer



                                THE MORGAN STANLEY VENTURE PARTNERS
                                ENTREPRENEUR FUND, L.P.

                                By: Morgan Stanley Venture Partners III, L.L.C.,
                                       as General Partner

                                By: Morgan Stanley Venture Capital III, Inc.,
                                       as Institutional Managing Member of the
                                       General Partner


                                By: /s/ Debra Abramovitz
                                   --------------------------------------------
                                      Name:  Debra Abramovitz
                                      Title: Vice President and Treasurer


                                Page 13 of 13


<PAGE>


                                                                       EXHIBIT 1


                             JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k) under the Securities Exchange Act of
1934, as amended, each of the persons named below agrees to the joint filing of
a Statement on Schedule 13G (including amendments thereto) with respect to the
common stock, par value $0.001 per share, of InterNAP Network Services
Corporation, a Washington corporation, and further agrees that this Joint
Filing Agreement be included as an exhibit to such filings provided that, as
contemplated by Section 13d-1(k)(l)(ii), no person shall be responsible for the
completeness or accuracy of the information concerning the other persons making
the filing, unless such person knows or has reason to believe that such
information is inaccurate.

     In evidence thereof, the undersigned, being duly authorized, hereby
execute this Agreement this January 26, 2001.

     This Schedule may be executed in two or more counterparts, any one of
which need not contain the signature of more than one party, but all such
parties taken together will constitute part of this Schedule.

MORGAN STANLEY DEAN WITTER & CO.

By:  /s/ Peter Vogelsang
    --------------------------------------------
    Name:    Peter Vogelsang
    Title:   Authorized Signatory


MORGAN STANLEY VENTURE CAPITAL III, INC.

By: /s/ Debra Abramovitz
    --------------------------------------------
    Name:    Debra Abramovitz
    Title:   Vice President and Treasurer


MORGAN STANLEY VENTURE PARTNERS III, L.L.C.
By: Morgan Stanley Venture Capital III, Inc.,
    as Institutional Managing Member

By: /s/ Debra Abramovitz
    --------------------------------------------
    Name:    Debra Abramovitz
    Title:   Vice President and Treasurer



<PAGE>


MORGAN STANLEY VENTURE PARTNERS III, L.P.
By: Morgan Stanley Venture Partners III, L.L.C.,
    as General Partner

By: Morgan Stanley Venture Capital III, Inc.,
    as Institutional Managing Member of the
    General Partner

By: /s/ Debra Abramovitz
    --------------------------------------------
    Name:    Debra Abramovitz
    Title:   Vice President and Treasurer


MORGAN STANLEY VENTURE INVESTORS III, L.P.
By: Morgan Stanley Venture Partners III, L.L.C.,
    as General Partner

By: Morgan Stanley Venture Capital III, Inc.,
    as Institutional Managing Member of the
    General Partner

By: /s/ Debra Abramovitz
    --------------------------------------------
    Name:    Debra Abramovitz
    Title:   Vice President and Treasurer


THE MORGAN STANLEY VENTURE PARTNERS ENTREPRENEUR
FUND, L.P.

By: Morgan Stanley Venture Partners III, L.L.C.,
    as General Partner
By: Morgan Stanley Venture Capital III, Inc.,
    as Institutional Managing Member of the
    General Partner

By: /s/ Debra Abramovitz
    --------------------------------------------
    Name:    Debra Abramovitz
    Title:   Vice President and Treasurer


                                       2