TUMBLEWEED COMMUNICATIONS CORP
SC 13G, 2000-02-14
COMMUNICATIONS SERVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 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 13d-2 (b)
                             (Amendment No._______)*


                         Tumbleweed Communications Corp
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    899690101
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 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)

*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 ("Act") 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 pages)



                               Page 1 of 14 Pages



<PAGE>


<TABLE>
<CAPTION>

- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 899690101                                               13 G                  Page 2 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
<S>          <C>
1            NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
                      August Capital, L.P. ("August I")
                      Tax ID Number:  94-3228541
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------
3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
             Delaware
- ------------------------------------ -------- ------------------------------------------------------------------------
               NUMBER OF             5        SOLE VOTING POWER
                SHARES                        1,858,586 shares,  except that ACM, the general partner of August I, may
             BENEFICIALLY                     be deemed to have sole voting  power,  and John  Johnston  ("Johnston"),
             OWNED BY EACH                    David F. Marquardt ("Marquardt"), and Andrew S. Rappaport ("Rappaport"),
               REPORTING                      the  members of ACM,  may be deemed to have  shared  power to vote these
                PERSON                        shares.
                 WITH                -------- ------------------------------------------------------------------------
                                     6        SHARED VOTING POWER
                                              See response to row 5.
                                     -------- ------------------------------------------------------------------------
                                     7        SOLE DISPOSITIVE POWER
                                              1,858,586 shares,  except that ACM, the general partner of August I, may
                                              be deemed to have sole dispositive power, and Johnston,  Marquardt,  and
                                              Rappaport,  the members of ACM,  may be deemed to have  shared  power to
                                              dispose of these shares.
                                     -------- ------------------------------------------------------------------------
                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------
9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                        1,858,586
- ------------ ---------------------------------------------------------------------------------------------------------
10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                                   [ ]
- ------------ ---------------------------------------------------------------------------------------------------------
11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                     6.57%
- ------------ ---------------------------------------------------------------------------------------------------------
12           TYPE OF REPORTING PERSON*
                                                                                                     PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>

- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 899690101                                               13 G                  Page 3 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
<S>          <C>
1            NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
                      August Capital Strategic Partners, L.P. ("Partners I")
                      Tax ID Number:  94-3228637
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------
3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
             Delaware
- ------------------------------------ -------- ------------------------------------------------------------------------
               NUMBER OF             5        SOLE VOTING POWER
                SHARES                        64,577 shares,  except that ACM, the general  partner of Partners I, may
             BENEFICIALLY                     be deemed to have sole voting  power,  and John  Johnston  ("Johnston"),
             OWNED BY EACH                    David F. Marquardt ("Marquardt"), and Andrew S. Rappaport ("Rappaport"),
               REPORTING                      the  members of ACM,  may be deemed to have  shared  power to vote these
                PERSON                        shares.
                 WITH                -------- ------------------------------------------------------------------------
                                     6        SHARED VOTING POWER
                                              See response to row 5.
                                     -------- ------------------------------------------------------------------------
                                     7        SOLE  DISPOSITIVE  POWER
                                              64,577 shares,  except that ACM, the general  partner of Partners I, may
                                              be deemed to have sole dispositive power, and Johnston,  Marquardt,  and
                                              Rappaport,  the members of ACM,  may be deemed to have  shared  power to
                                              dispose of these shares.
                                     -------- ------------------------------------------------------------------------
                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------
9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       64,577
- ------------ ---------------------------------------------------------------------------------------------------------
10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.23%
- ------------ ---------------------------------------------------------------------------------------------------------
12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 899690101                                               13 G                  Page 4 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
<S>          <C>
1            NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
                      August Capital Associates, L.P. ("Associates I")
                      Tax ID Number:  94-3228636
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X])
- ------------ ---------------------------------------------------------------------------------------------------------
3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
             Delaware
- ------------------------------------ -------- ------------------------------------------------------------------------
               NUMBER OF             5        SOLE VOTING POWER
                SHARES                        94,846 shares, except that ACM, the general partner of Associates I, may
             BENEFICIALLY                     be deemed to have sole voting  power,  and John  Johnston  ("Johnston"),
             OWNED BY EACH                    David F. Marquardt ("Marquardt"), and Andrew S. Rappaport ("Rappaport"),
               REPORTING                      the  members of ACM,  may be deemed to have  shared  power to vote these
                PERSON                        shares.
                 WITH                -------- ------------------------------------------------------------------------
                                     6        SHARED VOTING POWER
                                              See response to row 5.
                                     -------- ------------------------------------------------------------------------
                                     7        SOLE  DISPOSITIVE  POWER
                                              94,846 shares, except that ACM, the general partner of Associates I, may
                                              be deemed to have sole dispositive power, and Johnston,  Marquardt,  and
                                              Rappaport,  the members of ACM,  may be deemed to have  shared  power to
                                              dispose of these shares.
                                     -------- ------------------------------------------------------------------------
                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------
9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                        94,846
- ------------ ---------------------------------------------------------------------------------------------------------
10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                                [ ]
- ------------ ---------------------------------------------------------------------------------------------------------
11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                     0.33%
- ------------ ---------------------------------------------------------------------------------------------------------
12           TYPE OF REPORTING PERSON*
                                                                                                     PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>

- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 899690101                                               13 G                  Page 5 of 1 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
<S>          <C>
1            NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
                      August Capital Management, L.L.C. ("ACM")
                      Tax ID Number:  94-3228539
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------
3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
             Delaware
- ------------------------------------ -------- ------------------------------------------------------------------------
               NUMBER OF             5        SOLE VOTING POWER
                SHARES                        2,018,009  shares,  of which  1,858,586 are directly  owned by August I,
             BENEFICIALLY                     64,577  directly  owned by Partners I and 94,846 are  directly  owned by
             OWNED BY EACH                    Associates I. Johnston,  Marquardt,  and Rappaport,  the members of ACM,
               REPORTING                      may be deemed to have shared power to vote these shares.
                PERSON               -------- ------------------------------------------------------------------------
                 WITH                6        SHARED VOTING POWER
                                              See response to row 5.
                                     -------- ------------------------------------------------------------------------
                                     7        SOLE DISPOSITIVE POWER
                                              2,018,009  shares,  of which  1,858,586 are directly  owned by August I,
                                              64,577 are directly owned by Partners I and 94,846 are directly owned by
                                              Associates I. Johnston,  Marquardt,  and Rappaport,  the members of ACM,
                                              may be deemed to have shared power to dispose of these shares.
                                     -------- ------------------------------------------------------------------------
                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------
9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       2,018,009
- ------------ ---------------------------------------------------------------------------------------------------------
10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                                [ ]
- ------------ ---------------------------------------------------------------------------------------------------------
11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                     7.14%
- ------------ ---------------------------------------------------------------------------------------------------------
12           TYPE OF REPORTING PERSON*
                                                                                                     OO
- ------------ ---------------------------------------------------------------------------------------------------------
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>


- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 899690101                                               13 G                  Page 6 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
             NAME OF REPORTING PERSON
1            I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
                      John Johnston ("Johnston")
                      Tax ID Number:
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------
3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
             U.S. Citizen
- ------------------------------------ -------- ------------------------------------------------------------------------
              NUMBER OF              5        SOLE VOTING POWER
               SHARES                         0 shares
            BENEFICIALLY             -------- ------------------------------------------------------------------------
            OWNED BY EACH            6        SHARED VOTING POWER
              REPORTING                       2,018,009  shares,  of which  1,858,586 are directly  owned by August I,
               PERSON                         64,577 are directly owned by Partners I and 94,846 are directly owned by
                WITH                          Associates  I. ACM is the  general  partner of August I,  Partners I and
                                              Associates  I, and  Johnston,  a member  of ACM,  may be  deemed to have
                                              shared power to vote these shares.
                                     -------- ------------------------------------------------------------------------
                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------
                                     8        SHARED DISPOSITIVE POWER
                                              2,018,009  shares,  of which  1,858,586 are directly  owned by August I,
                                              64,577 are directly owned by Partners I and 94,846 are directly owned by
                                              Associates  I. ACM is the  general  partner of August I,  Partners I and
                                              Associates  I, and  Johnston,  a member  of ACM,  may be  deemed to have
                                              shared power to dispose of these shares.
- ------------ ---------------------------------------------------------------------------------------------------------
9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       2,018,009
- ------------ ---------------------------------------------------------------------------------------------------------
10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]
- ------------ ---------------------------------------------------------------------------------------------------------
11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    7.14%
- ------------ ---------------------------------------------------------------------------------------------------------
12           TYPE OF REPORTING PERSON*
                                                                                                     IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 899690101                                               13 G                  Page 7 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
<S>          <C>
1            I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
                      David F. Marquardt ("Marquardt")
                      Tax ID Number:
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------
3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
             U.S. Citizen
- ------------------------------------ -------- ------------------------------------------------------------------------
              NUMBER OF              5        SOLE VOTING POWER
               SHARES                         0 shares
            BENEFICIALLY             -------- ------------------------------------------------------------------------
            OWNED BY EACH            6        SHARED VOTING POWER
              REPORTING                       2,018,009  shares,  of which  1,858,586 are directly  owned by August I,
               PERSON                         64,577 are directly owned by Partners I and 94,846 are directly owned by
                WITH                          Associates  I. ACM is the  general  partner of August I,  Partners I and
                                              Associates  I, and  Marquardt,  a member  of ACM,  may be deemed to have
                                              shared power to vote these shares.
                                     -------- ------------------------------------------------------------------------
                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------
                                     8        SHARED DISPOSITIVE POWER
                                              2,018,009  shares,  of which  1,858,586 are directly  owned by August I,
                                              64,577 are directly owned by Partners I and 94,846 are directly owned by
                                              Associates  I. ACM is the  general  partner of August I,  Partners I and
                                              Associates  I, and  Marquardt,  a member  of ACM,  may be deemed to have
                                              shared power to dispose of these shares.
- ------------ ---------------------------------------------------------------------------------------------------------
9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       2,018,009
- ------------ ---------------------------------------------------------------------------------------------------------
10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]
- ------------ ---------------------------------------------------------------------------------------------------------
11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    7.14%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 899690101                                               13 G                  Page 8 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
<S>          <C>
1            NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
                      Andrew S. Rappaport ("Rappaport")
                      Tax ID Number:
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------
3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
             U.S. Citizen
- ------------------------------------ -------- ------------------------------------------------------------------------
               NUMBER OF             5        SOLE VOTING POWER
                SHARES                        0 shares
             BENEFICIALLY            -------- ------------------------------------------------------------------------
             OWNED BY EACH           6        SHARED VOTING POWER
               REPORTING                      2,018,009  shares,  of which  1,858,586 are directly  owned by August I,
                PERSON                        64,577 are directly owned by Partners I and 94,846 are directly owned by
                 WITH                         Associates  I. ACM is the  general  partner of August I,  Partners I and
                                              Associates  I, and  Rappaport,  a member  of ACM,  may be deemed to have
                                              shared power to vote these shares.
                                     -------- ------------------------------------------------------------------------
                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------
                                     8        SHARED DISPOSITIVE POWER
                                              2,018,009  shares,  of which  1,858,586 are directly  owned by August I,
                                              64,577 are directly owned by Partners I and 94,846 are directly owned by
                                              Associates  I. ACM is the  general  partner of August I,  Partners I and
                                              Associates  I, and  Rappaport,  a member  of ACM,  may be deemed to have
                                              shared power to dispose of these shares.
- ------------ ---------------------------------------------------------------------------------------------------------
9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                        2,018,009
- ------------ ---------------------------------------------------------------------------------------------------------
10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                                [ ]
- ------------ ---------------------------------------------------------------------------------------------------------
11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                     7.14%
- ------------ ---------------------------------------------------------------------------------------------------------
12           TYPE OF REPORTING PERSON*
                                                                                                     IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

- -----------------------------                     ------------------------------
CUSIP NO. 899690101                   13 G               Page 9 of 14 Pages
- -----------------------------                     ------------------------------

ITEM 1(a).        NAME OF ISSUER:
                  ---------------

                  Tumbleweed Communications Corp

ITEM 1(b).        ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
                  ------------------------------------------------
                  2010 Broadway
                  Redwood City, California 94063

ITEM 2(a).        NAME OF PERSON FILING:
                  ----------------------
                  This  statement is filed by August  Capital,  L.P., a Delaware
                  limited  partnership  ("August I"),  August Capital  Strategic
                  Partners, L.P., a Delaware limited partnership ("Partners I"),
                  August   Capital   Associates,   L.P.,   a  Delaware   limited
                  partnership ("Associates I"), August Capital Management LLC, a
                  Delaware  limited  liability  company  ("ACM"),  John Johnston
                  ("Johnston"),  David F. Marquardt ("Marquardt"), and Andrew S.
                  Rappaport   ("Rappaport").    The   foregoing   entities   and
                  individuals  are  collectively  referred to as the  "Reporting
                  Persons".

                  ACM is  the  general  partner  of  August  I,  Partners  I and
                  Associates I, and may be deemed to have sole power to vote and
                  sole power to dispose of shares of the issuer  directly  owned
                  by August I, Partners I and Associates I. Johnston, Marquardt,
                  and  Rappaport  are the  managing  members of ACM,  and may be
                  deemed  to have  shared  power  to vote  and  shared  power to
                  dispose  of the shares of issuer  directly  owned by August I,
                  Partners I and Associates I.

ITEM 2(b).        ADDRESS OF PRINCIPAL BUSINESS OFFICE, OR, IF NONE, RESIDENCE:
                  -------------------------------------------------------------
                  The address of the principal  business  office for each of the
                  Reporting Persons is:

                  August Capital
                  2480 Sand Hill Road, Suite 101
                  Menlo Park, California 94025

ITEM 2(c)         CITIZENSHIP:
                  ------------
                  August I,  Partners I and  Associates I are  Delaware  limited
                  partnerships.  ACM is a Delaware  limited  liability  company.
                  Johnston, Marquardt, and Rappaport are United States citizens.

ITEM 2(d).        TITLE OF CLASS OF SECURITIES:
                  -----------------------------
                  Common Stock

ITEM 2(e).        CUSIP NUMBER:
                  -------------
                  899690101

ITEM 3.           Not Applicable



<PAGE>

- -----------------------------                     ------------------------------
CUSIP NO. 899690101                   13 G               Page 10 of 14 Pages
- -----------------------------                     ------------------------------


ITEM 4.     OWNERSHIP:
            ----------
            The following information with respect to the ownership of the
            Common  Stock  of  the  issuer  by  the  persons  filing  this
            Statement is provided as of December 31, 1999:


            (a)   Amount beneficially owned:
                  -------------------------
                  See Row 9 of cover  page for each  Reporting
                  Person.


            (b)   Percent of Class:
                  ----------------
                  See Row 11 of cover page for each  Reporting
                  Person.

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

                (i)     Sole power to vote or to direct the vote:
                        ----------------------------------------
                        See Row 5 of  cover  page  for  each
                        Reporting Person.

               (ii)     Shared power to vote or to direct the vote:
                        ------------------------------------------
                        See Row 6 of  cover  page  for  each
                        Reporting Person.

               (iii)    Sole power to dispose or to direct the disposition of:
                        -----------------------------------------------------
                        See Row 7 of  cover  page  for  each
                        Reporting Person.

               (iv)     Shared power to dispose or to direct the disposition of:
                        -------------------------------------------------------
                        See Row 8 of  cover  page  for  each
                        Reporting Person.


<PAGE>

- -----------------------------                     ------------------------------
CUSIP NO. 899690101                   13 G              Page 11 of 14 Pages
- -----------------------------                     ------------------------------


ITEM 5.        OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:
               ---------------------------------------------

               Not applicable.

ITEM 6.        OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:
               ---------------------------------------------------------------

               Under   certain   circumstances   set  forth  in  the  limited
               partnership  agreements of August I, Partners I and Associates
               I, the general and limited  partners of each of such  entities
               may be deemed to have the right to receive  dividends from, or
               the proceeds  from,  the sale of shares of the issuer owned by
               each such entity of which they are a partner.

ITEM 7.        IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
               ACQUIRED THE SECURITY BEING REPORTED
               ON BY THE PARENT HOLDING COMPANY:
               ----------------------------------------------------------

               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.       CERTIFICATION:
               -------------

               Not applicable



<PAGE>

- -----------------------------                     ------------------------------
CUSIP NO. 899690101                   13 G               Page 12 of 14 Pages
- -----------------------------                     ------------------------------


                                   SIGNATURES

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.


Dated:  February 7, 2000


                                      By: /s/ John Johnston
                                          --------------------------------------
                                          John  Johnston,  individually,  and on
                                          behalf of August I, in his capacity as
                                          a managing  member of ACM, the general
                                          partner  of  August  I, on  behalf  of
                                          Partners  I,  in  his  capacity  as  a
                                          managing  member of ACM,  the  general
                                          partner  of  Partners  I, on behalf of
                                          Associates  I,  in his  capacity  as a
                                          managing  member of ACM,  the  general
                                          partner of Associates I, and on behalf
                                          of ACM in his  capacity  as a managing
                                          member thereof.


                                      By: /s/ David F. Marquardt
                                          --------------------------------------
                                          David F. Marquardt


                                      By: /s/ Andrew S. Rappaport
                                          --------------------------------------
                                          Andrew S. Rappaport




<PAGE>

- -----------------------------                     ------------------------------
CUSIP NO. 899690101                   13 G              Page 13 of 14 Pages
- -----------------------------                     ------------------------------


                                  EXHIBIT INDEX


                                                              Found on
                                                            Sequentially
Exhibit                                                     Numbered Page
- -------                                                     -------------
Exhibit A:  Agreement of Joint Filing                            14




<PAGE>


- -----------------------------                     ------------------------------
CUSIP NO. 899690101                   13 G               Page 14 of 14 Pages
- -----------------------------                     ------------------------------


                                    EXHIBIT A

                            Agreement of Joint Filing

         The  undersigned  hereby  agree  that a  single  Schedule  13G  (or any
amendment  thereto)  relating to the Common Stock of  Tumbleweed  Communications
Corp shall be filed on behalf of each of the undersigned and that this Agreement
shall be filed as an exhibit to such Schedule 13G.

Date:  February 7, 2000


                                      By: /s/ John Johnston
                                          --------------------------------------
                                          John  Johnston,  individually,  and on
                                          behalf of August I, in his capacity as
                                          a managing  member of ACM, the general
                                          partner  of  August  I, on  behalf  of
                                          Partners  I,  in  his  capacity  as  a
                                          managing  member of ACM,  the  general
                                          partner  of  Partners  I, on behalf of
                                          Associates  I,  in his  capacity  as a
                                          managing  member of ACM,  the  general
                                          partner of Associates I, and on behalf
                                          of ACM in his  capacity  as a managing
                                          member thereof.


                                      By: /s/ David F. Marquardt
                                          --------------------------------------
                                          David F. Marquardt


                                      By: /s/ Andrew S. Rappaport
                                          --------------------------------------
                                          Andrew S. Rappaport







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