BAKER COMMUNICATIONS FUND L P
SC 13D, 1999-11-08
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                                (Amendment No. )*

                            AKAMAI TECHNOLOGIES, INC.
                            _________________________
                                (Name of Issuer)

                     Common Stock, Par Value $0.01 Per Share
                     _______________________________________
                         (Title of Class of Securities)

                                   00971T101
                                 _______________
                                 (CUSIP Number)

                             Edward D. Sopher, Esq.
                    Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                               590 Madison Avenue
                            New York, New York 10022
                                 (212) 872-1000
                _________________________________________________
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                October 29, 1999
                      _____________________________________
                      (Date of Event which Requires Filing
                               of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box
[ ].

Note.  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including  all  exhibits.  See Rule 13d-7(b) for other
parties to whom copies are to be sent.

*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
disclosures provided in a prior cover page.

The information required on 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).

                         Continued on following page(s)
                               Page 1 of 19 Pages
                             Exhibit Index: Page 14


<PAGE>


                                                              Page 2 of 19 Pages

                                  SCHEDULE 13D

CUSIP No. 00971T101

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  BAKER COMMUNICATIONS FUND, L.P.

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  WC

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e)             [ ]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
  Number of                                 7,818,471
   Shares
Beneficially               8       Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   7,818,471
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            7,818,471

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                        [ ]

13       Percent of Class Represented By Amount in Row (11)

                                    8.38%

14       Type of Reporting Person*

                  PN; IA


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                                              Page 3 of 19 Pages

                                  SCHEDULE 13D

CUSIP No. 00971T101

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  BAKER CAPITAL PARTNERS, LLC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e)        [ ]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
  Number of                                 0
   Shares
Beneficially               8       Shared Voting Power
  Owned By                                  7,818,471
   Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                            7,818,471

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            7,818,471

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                 [ ]

13       Percent of Class Represented By Amount in Row (11)

                                    8.38%

14       Type of Reporting Person*

                  00; IA


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>



                                                              Page 5 of 19 Pages

                                  SCHEDULE 13D

CUSIP No. 00971T101

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  EDWARD W. SCOTT

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e)        [ ]

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
  Number of                                 0
   Shares
Beneficially               8       Shared Voting Power
  Owned By                                  7,818,471
   Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                            7,818,471

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            7,818,471

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                        [ ]

13       Percent of Class Represented By Amount in Row (11)

                                    8.38%

14       Type of Reporting Person*

                  IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                                              Page 6 of 19 Pages

                  This  Statement  on  Schedule  13D relates to shares of Common
Stock, $0.01 par value per share (the "Shares"),  of Akamai  Technologies,  Inc.
(the  "Issuer").  This  Statement  is being filed by the  Reporting  Persons (as
defined herein) to report the recent  acquisition of Shares of the Issuer,  as a
result of which the Reporting  Persons may be deemed to be the beneficial owners
of more than five percent of the outstanding Shares of the Issuer.

Item 1.  Security and Issuer.

                  This  Statement  relates  to the  Shares.  The  address of the
principal executive office of the Issuer is 201 Broadway, Cambridge MA 02139.

Item 2.           Identity and Background.

                  This  Statement  is  being  filed  on  behalf  of  each of the
following persons (collectively, the "Reporting Persons"):

         i)       Baker Communications Fund, L.P. ("Baker Fund");

         ii)      Baker Capital Partners, LLC ("Baker Partners");

         iii)     Mr. Edward W. Scott ("Mr. Scott").


                  This  Statement  relates to the Shares held for the account of
Baker Fund.

                  Baker  Fund  is  a  Delaware  limited   partnership  with  its
principal  address at 540 Madison  Avenue,  New York,  NY 10022.  The  principal
business of Baker Fund is investment in securities.

                  Baker Partners is a Delaware  limited  liability  company with
its principal address at 540 Madison Avenue,  New York, NY 10022. Baker Partners
is the sole  general  partner  of  Baker  Fund  and,  as such,  is  vested  with
investment  discretion  over the Shares held for the account of Baker Fund.  The
principal  business of Baker  Partners  is to provide  management  and  advisory
services  to,  and to  invest  in,  Baker  Fund.  By  reason  of its  investment
discretion  over the Shares held for the account of Baker Fund,  Baker  Partners
may be deemed the  beneficial  owner of the Shares held for the account of Baker
Fund. Current information concerning the managers of Baker Partners is set forth
in Annex A hereto.

                  Mr.  Scott is a citizen of the United  States.  The  principal
occupation  of Mr.  Scott is serving as a manager  of Baker  Partners,  which is
carried  out at  Baker  Partners'  principal  address.  As a  manager  of  Baker
Partners,  Mr. Scott has the ability to direct the investment decisions of Baker
Partners.  As a result,  Mr.  Scott may be deemed  the  beneficial  owner of the
Shares held for the account of Baker Fund.

                  During the past five years, none of the Reporting Persons and,
to the best of the Reporting Persons'  knowledge,  no other person identified in
response to this Item 2 has been (a) convicted in a criminal proceeding or (b) a
party to any civil  proceeding as a result of which it or he has been subject to
a judgment, decree or final order enjoining future violations of, or prohibiting
or mandating activities subject to, federal or


<PAGE>


                                                              Page 7 of 19 Pages

state securities laws, or finding any violation with respect to such laws.

Item 3.           Source and Amount of Funds or Other Consideration.

                  Baker Fund expended  approximately  $15,399,935 of its working
capital to purchase the securities reported herein as being acquired in the last
60 days.

                  The securities  held for the account of Baker Fund may be held
through margin accounts  maintained with brokers,  which extend margin credit as
and when required to open or carry positions in their margin  accounts,  subject
to applicable federal margin  regulations,  stock exchange rules and such firms'
credit  policies.  The  positions  which  may be  held in the  margin  accounts,
including the Shares,  are pledged as  collateral  security for the repayment of
debit balances in the respective accounts.

Item 4.  Purpose of Transaction.

                  All of the securities  reported herein as having been acquired
from the account of Baker Fund were acquired for investment purposes.  Except as
set  forth  below,  neither  the  Reporting  Persons  nor,  to the best of their
knowledge,  any of the other  persons  identified in response to Item 2, has any
plans or  proposals  that relate to or would  result in any of the  transactions
described in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

                  As a Director of the Issuer, Mr. Scott may have influence over
the corporate activities of the Issuer,  including as may relate to transactions
described in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

                  The Reporting  Persons reserve the right to acquire,  or cause
to be acquired,  additional securities of the Issuer, to dispose of, or cause to
be disposed,  such securities at any time or to formulate other purposes,  plans
or proposals regarding the Issuer or any of its securities, to the extent deemed
advisable in light of general  investment and trading  policies of the Reporting
Persons, market conditions or other factors.

Item 5.  Interest in Securities of the Issuer.

                           (a)      (i)     Each of Baker Fund,  Baker Partners
and Mr.  Scott may be deemed the  beneficial  owner of the  7,818,471
Shares  held by Baker Fund  (approximately  8.38% of the total  number of Shares
which would be outstanding assuming the conversion of all of the securities held
by Baker Fund).

                           (b)      (i)     Baker Fund may be deemed to have the
sole power to direct the voting and disposition of the 7,818,471  Shares held by
Baker Fund  (assuming  the  conversion  of all of the  securities  held by Baker
Fund).

                                    (ii)   Each of Baker Partners, and Mr. Scott
may be deemed to have the  shared  power to direct the voting and
disposition of the 7,818,471  Shares held by Baker Fund (assuming the conversion
of all of the securities held by Baker Fund).

                           (c)              Except for the  transactions  listed
on Annex B hereto, there have been no transactions  effected with respect to the
Shares since  September 9, 1999 (60 days prior to the date hereof) by any of the
Reporting Persons.

                           (d)              The  partners of Baker Fund have the
right to  participate in the receipt of dividends from or proceeds from the sale
of securities of the Issuer, including the Shares, held for the account of Baker
Fund in accordance with their partnership interests in Baker Fund.


<PAGE>


                                                              Page 8 of 19 Pages


                           (e)      Not applicable.

Item 6.  Contracts,  Arrangements,  Understandings or Relationships with Respect
         to Securities of the Issuer.

                  On April 16,  1999,  Baker Fund  entered  into a  Registration
Rights   Agreement  (as  amended  and  restated  on  September  20,  1999,   the
"Registration  Rights  Agreement") with the Issuer and other stockholders of the
Issuer  pursuant to which the Issuer  granted  Baker Fund  certain  registration
rights with respect to certain of the Issuer's securities.

                  Pursuant to Section 2 and Section 4 of the Registration Rights
Agreement,  Baker Fund was  granted  certain  rights  relating to its ability to
demand that the Issuer  register under the  Securities Act of 1933  unregistered
securities of the Issuer held by Baker Fund.

                  Pursuant to Section 3 and Section 4 of the Registration Rights
Agreement, Baker Fund was granted certain piggy-back registration rights, which,
if exercised,  entitle Baker Fund to participate in registered  offerings by the
Issuer.

                  Pursuant to Section 11 of the Registration  Rights  Agreement,
Baker Fund may be  required  to enter  into a lock-up  agreement  under  certain
circumstances.

                  The foregoing description of the Registration Rights Agreement
does not purport to be complete and is qualified in its entirety by reference to
the Registration Rights Agreement,  which is incorporated herein by reference as
Exhibit B to this Statement.

                  On May 7, 1999 Baker Fund  acquired  a Common  Stock  Purchase
Warrant  (the  "Purchase  Warrant")  from  the  Issuer  in  connection  with the
acquisition of a 15% senior subordinated note in principal amount of $7,000,000.

                  Pursuant to Section 6 of the Purchase Warrant,  Baker Fund was
granted  certain  rights  relating  to its  ability  to demand  that the  Issuer
register under the Securities Act of 1933 unregistered  securities of the Issuer
held by Baker Fund.

                  The  foregoing  description  of the Purchase  Warrant does not
purport to be complete  and is  qualified  in its  entirety by  reference to the
Purchase Warrant, which is incorporated herein by reference as Exhibit C to this
Statement.

                  On October 28, 1999,  each of Baker Fund and Mr. Scott entered
into a form of lock-up  agreement (the "Form of Lock-Up  Agreement") with Morgan
Stanley & Co. Incorporated,  Donaldson,  Lufkin & Jenrette, Salomon Smith Barney
and Thomas  Weisel  Partners  LLC  pursuant  to which each of Baker Fund and Mr.
Scott is prohibited from selling  certain  securities of the Issuer for a period
of time.

                  The  foregoing  description  of the Form of Lock-Up  Agreement
does not purport to be complete and is qualified in its entirety by reference to
the Form of Lock-Up  Agreement,  which is  incorporated  herein by  reference as
Exhibit D to this Statement.

                  From  time to time,  each of the  Reporting  Persons  may lend
securities,   including  the  Shares,  to  brokers,  banks  or  other  financial
institutions.  These  loans  typically  obligate  the  borrower  to  return  the
securities,  or an equal amount of securities  of the same class,  to the lender
and  typically  provide that the borrower is entitled to exercise  voting rights
and to retain  dividends  during the term of the loan. From time to time, to the
extent  permitted by applicable  laws, each of the Reporting  Persons may borrow
securities, including the Shares, for the


<PAGE>


                                                              Page 9 of 19 Pages

purpose of effecting, and may effect, short sale transactions,  and may purchase
securities for the purpose of closing out short positions in such securities.

Item 7.  Material to be Filed as Exhibits.

                  A.  Joint Filing Agreement dated November 8, 1999 by and among
Baker Fund, Baker Partners and Mr. Scott.

                  B.  Registration  Rights  Agreement  dated April 16, 1999,  as
amended and restated on September 20, 1999, by and among Baker Fund,  the Issuer
and other stockholders of the Issuer (filed as Exhibit 4.2 to Amendment No. 1 of
the Issuer's Form S-1 (Commission File Number 333-85679) and incorporated herein
by reference).

                  C. Common  Stock  Purchase  Warrant  dated May 7, 1999 between
Baker Fund and the  Issuer  (filed as Exhibit  10.20 to  Amendment  No. 1 of the
Issuer's Form S-1 (Commission File Number 333-85679) and incorporated  herein by
reference).

                  D. Form of Lock-Up  Agreement  dated  October 28, 1999 between
Baker Fund and Morgan Stanley & Co. Incorporated,  Donaldson, Lufkin & Jenrette,
Salomon Smith Barney and Thomas  Weisel  Partners LLC, and between Mr. Scott and
Morgan Stanley & Co. Incorporated,  Donaldson,  Lufkin & Jenrette, Salomon Smith
Barney and Thomas Weisel Partners LLC.



<PAGE>


                                                             Page 10 of 19 Pages

                                   SIGNATURES

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

Date: November 8, 1999

                                BAKER COMMUNICATIONS FUND, L.P.

                                By:      Baker Capital Partners, LLC
                                         Its General Partner


                                         By:      /S/ JOHN C. BAKER
                                                  ------------------------------
                                                  John C. Baker
                                                  Chairman


                                BAKER CAPITAL PARTNERS, LLC


                                By:      /S/ JOHN C. BAKER
                                         ---------------------------------------
                                         John C. Baker
                                         Chairman




<PAGE>


                                                             Page 11 of 19 Pages



                                 EDWARD W. SCOTT



                                 /S/ EDWARD W. SCOTT
                                 -----------------------------------------------


<PAGE>


                                                             Page 12 of 19 Pages


                                     ANNEX A


                  The following is a list of all of the persons  (other than Mr.
Scott) who serve as managers of Baker Partners.

John C. Baker
Lawrence Bettino
Ashley Leeds
Henry Baker


         Each of the  above-listed  persons  is a United  States  citizen  whose
principal  occupation is serving as a manager of Baker Partners,  and each has a
business address c/o Baker Capital Partners,  LLC, 540 Madison Avenue, New York,
NY 10022

         To the best of the Reporting Persons' knowledge:

                  (a) None of the above persons holds any Shares directly.

                  (b) None of the above persons has any contracts, arrangements,
understandings or relationships with respect to the Shares.

















<PAGE>


                                                             Page 13 of 19 Pages


                                     ANNEX B

                    RECENT TRANSACTIONS IN THE SECURITIES OF
                            AKAMAI TECHNOLOGIES, INC.


                             Date of        Nature of         Number of
For the Account of          Transaction    Transaction         Shares      Price

BAKER FUND                  10/25/99        PURCHASE          145,195        /1/
                            10/29/99        PURCHASE          400,000  $26.00/2/











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

/1/      On the date of the Issuer's initial public offering,  145,195 shares of
         Series C Convertible  Preferred Stock held by Baker Fund  automatically
         converted into 908,339 Shares.
/2/      Acquired in Issuer's initial public offering.





<PAGE>


                                                             Page 14 of 19 Pages

                                  EXHIBIT INDEX

                                                                        Page No.
                                                                        --------


A.       Joint  Filing  Agreement  dated  November 8, 1999 by and
         among Baker  Communications  Fund,  L.P.,  Baker Capital
         Partners, LLC and Mr. Edward W. Scott                                15

B.       Registration  Rights  Agreement dated April 16, 1999, as
         amended and restated on September 20, 1999, by and among
         Baker  Communications  Fund, L.P., Akamai  Technologies,
         Inc. and other stockholders of Akamai Technologies, Inc.
         (filed  as  Exhibit  4.2 to  Amendment  No. 1 to  Akamai
         Technologies,  Inc.'s Form S-1  (Commission  File Number
         333-85679) and incorporated herein by reference)

C.       Common Stock Purchase  Warrant dated May 7, 1999 between
         Baker  Fund   Communications   Fund,   L.P.  and  Akamai
         Technologies,  Inc. (filed as Exhibit 10.20 to Amendment
         No.  1  to   Akamai   Technologies,   Inc.'s   Form  S-1
         (Commission  File  Number  333-85679)  and  incorporated
         herein by reference)

D.       Form of Lock-Up Agreement dated October 28, 1999 between
         Baker  Communications  Fund, L.P.,  Morgan Stanley & Co.
         Incorporated,  Donaldson,  Lufkin  &  Jenrette,  Salomon
         Smith  Barney,  and  Thomas  Weisel  Partners  LLC,  and
         between  Mr.  Edward W. Scott and  Morgan  Stanley & Co.
         Incorporated,  Donaldson,  Lufkin  &  Jenrette,  Salomon
         Smith    Barney,     and    Thomas    Weisel    Partners
         LLC.....................................................             17







                                                             Page 15 of 19 Pages

                                    EXHIBIT A

                             JOINT FILING AGREEMENT

                  The  undersigned  hereby agree that the  statement on Schedule
13D with respect to the Common Stock of Akamai Technologies, Inc. dated November
8, 1999 is, and any amendments  thereto signed by each of the undersigned  shall
be,  filed  on  behalf  of each of us  pursuant  to and in  accordance  with the
provisions of Rule 13d-1(f) under the Securities Exchange Act of 1934.

Date:  November 8, 1999

                                  BAKER COMMUNICATIONS FUND, L.P.

                                  By:      Baker Capital Partners, LLC
                                           Its General Partner


                                           By:   /S/ JOHN C. BAKER
                                                 -------------------------------
                                                    John C. Baker
                                                    Chairman


                                  BAKER CAPITAL PARTNERS, LLC


                                  By:      /S/ JOHN C. BAKER
                                           -------------------------------------
                                           John C. Baker
                                           Chairman



<PAGE>


                                                             Page 16 of 19 Pages



                                 EDWARD W. SCOTT


                                 /S/ EDWARD W. SCOTT
                                 -----------------------------------------------







                                                             Page 17 of 19 Pages

                                    EXHIBIT D

                                                                October 28, 1999


Morgan Stanley & Co. Incorporated
Donaldson, Lufkin & Jenrette
Salomon Smith Barney
Thomas Weisel Partners LLC
c/o Morgan Stanley & Co. Incorporated
1585 Broadway
New York, NY  10036

Dear Sirs and Mesdames:

       The  undersigned  understands  that  Morgan  Stanley  & Co.  Incorporated
("Morgan  Stanley")  proposes  to  enter  into an  Underwriting  Agreement  (the
"Underwriting  Agreement") with Akamai Technology,  Inc., a Delaware corporation
(the "Company") providing for the public offering (the "Public Offering") by the
several Underwriters,  including Morgan Stanley (the "Underwriters"),  of shares
(the  "Shares") of the common stock,  par value $0.01 per share,  of the Company
(the "Common Stock").

       To induce the Underwriters that may participate in the Public Offering to
continue their efforts in connection with the Public  Offering,  the undersigned
hereby  agrees  that,  without  the prior  written  consent and waiver of Morgan
Stanley on behalf of the  Underwriters,  the  undersigned  will not,  during the
period  commencing  on the date hereof and ending 180 days after the date of the
final prospectus relating to the Public Offering (the "Prospectus"),  (1) offer,
pledge,  sell,  contract  to sell,  sell any  option or  contract  to  purchase,
purchase any option or contract to sell,  grant any option,  right or warrant to
purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any
shares of Common Stock or any  securities  convertible  into or  exercisable  or
exchangeable  for Common Stock, or (2) enter into any swap or other  arrangement
that transfers to another, in whole or in part, any of the economic consequences
of ownership of Common Stock,  whether any such transaction  described in clause
(1) or (2) above is to be  settled  by  delivery  of Common  Stock or such other
securities,  in cash or otherwise. The foregoing sentence shall not apply to the
sale of any Shares to the Underwriters  pursuant to the Underwriting  Agreement,
transactions  relating to shares of Common Stock or other securities acquired in
open market transactions after the completion of the Public Offering or the sale
or transfer of shares to the acquiror in connection with the sale of the Company
pursuant to a merger,  sale of stock, sale of assets or otherwise.  In addition,
the undersigned agrees that, without the prior written consent of Morgan Stanley
on behalf of the Underwriters,  it will not, during the period commencing on the
date  hereof  and ending  180 days  after the date of the  Prospectus,  make any
demand for or exercise any right with respect to, the registration of any shares
of Common Stock or any security  convertible into or exercisable or exchangeable
for Common Stock.


<PAGE>


       Notwithstanding  the  foregoing  (i)  gifts  and  transfers  by  will  or
intestacy  or  (ii)  transfers  to  (A)  the  undersigned's  members,  partners,
affiliates or immediate  family or (B) a trust,  the  beneficiaries of which are
the undersigned and/or members of the undersigned's  immediate family, shall not
be  prohibited  by this  agreement;  provided,  that (x) the donee or transferee
agrees in writing to be bound by the  foregoing in the same manner as it applies
to the  undersigned  and (y) if the donor or  transferor  is a reporting  person
subject to Section 16(a) of the  Securities  Exchange Act of 1934 (the "Exchange
Act"),  any gifts or transfers made in accordance  with this paragraph shall not
require such person to, and such person shall not voluntarily,  file a report of
such transaction on Form 4 under the Exchange Act. "Immediate family" shall mean
spouse, lineal descendants,  father, mother, brother or sister of the transferor
and father, mother, brother or sister of the transferor's spouse.

       Whether or not the Public Offering actually occurs depends on a number of
factors,  including  market  conditions.  Any Public  Offering will only be made
pursuant  to an  Underwriting  Agreement,  the  terms of which  are  subject  to
negotiation between the Company and the Underwriters.

       Morgan  Stanley,  on  behalf  of  the  Underwriters,  may,  in  its  sole
discretion,  waive or amend any restriction  contained in any lock-up  agreement
with a shareholder of the Company;  provided, that, if any shareholder listed on
                                    --------  ----
Exhibit A hereto (the  "Permitted  Seller")  sells in excess of an  aggregate of
10,000 Shares pursuant to any such waiver or amendment, the undersigned shall be
permitted  to sell that  percentage  of his or her total  number of Shares  that
equals the percentage obtained by dividing (x) the number of Shares in excess of
10,000  that  are  sold by the  Permitted  Seller  pursuant  to such  waiver  or
amendment,  by (y) the total number of Shares held by the Permitted Seller prior
to such sale.

       This agreement shall automatically terminate if any of the persons listed
on  Schedule A hereto  fail to sign a lock-up  substantially  in the form hereof
prior  to the  date of the  Prospectus,  if the  Underwriting  Agreement  is not
entered  into by December  31, 1999 or if the  Underwriters  do not purchase the
Shares and the Underwriting Agreement is terminated pursuant to its terms.




                                         Very truly yours,

                                         ________________________________
                                         (Name)

                                         ________________________________
                                         (Address)



<PAGE>


                                   Schedule A


F. Thomson Leighton
Daniel M. Lewin
THE ATREL TRUST
THE MALLARD TRUST
Paul Sagan
Robert O. Ball III
Earl P. Galleher III
David Goodtree
Steven P. Heinrich
Bruce M. Maggs
Jonathan Seelig
Battery Ventures IV, L.P.
Battery Investment Partners IV, LLC
Baker Communications Fund, L.P.
George H. Conrades
Polaris Venture Management Co. II., L.L.C.
Polaris Venture Partners II L.P.
Polaris Venture Partners Founders' Fund II L.P.
Arthur H. Bilger
Arthur H. Bilger 1996 Family Trust
ADASE Partners L.P.
AT Investors LLC
Todd A. Dagres
Terrance G. McGuire
Edward W. Scott
Apple Computer, Inc.
Cisco Systems, Inc.
Microsoft Corporation
















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