HARBINGER CORP
SC 13G, 2000-02-14
COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
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<PAGE>   1

                                                    ---------------------------
                                                           OMB APPROVAL
                                                    ---------------------------
                                                    OMB Number:       3235-0145
                                                    Expires:    August 31, 1999
                                                    Estimated average burden
                                                    Hours per response....14.90
                                                    ---------------------------

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                           (AMENDMENT NO. __________)*

                              HARBINGER CORPORATION
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    41145C103
                              ---------------------
                                 (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 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 ("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).


        POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION
        CONTAINED IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM
        DISPLAYS A CURRENTLY VALID OMB CONTROL NUMBER.




<PAGE>   2

- ----------------------                                      --------------------
CUSIP NO.                               13G                   PAGE 2 OF 8 PAGES
- ----------------------                                      --------------------

- --------------------------------------------------------------------------------
(1)     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
        Paul G. Allen
- --------------------------------------------------------------------------------
(2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) [ ]
                                                                         (b) [ ]
- --------------------------------------------------------------------------------
(3)     SEC USE ONLY
- --------------------------------------------------------------------------------
(4)     CITIZENSHIP OR PLACE OF ORGANIZATION
        United States of America
- --------------------------------------------------------------------------------
                              (5)     SOLE VOTING POWER
                                      -0- shares
                              --------------------------------------------------
           NUMBER OF          (6)     SHARED VOTING POWER
             SHARES                   2,740,854 shares (1)
          BENEFICIALLY        --------------------------------------------------
            OWNED BY          (7)     SOLE DISPOSITIVE POWER
              EACH                    -0- shares
           REPORTING          --------------------------------------------------
          PERSON WITH         (8)     SHARED DISPOSITIVE POWER
                                      2,740,854 shares (1)
                              --------------------------------------------------

(9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        2,740,854 shares (1)
- --------------------------------------------------------------------------------
(10)    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

- --------------------------------------------------------------------------------
(11)    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        7.1%
- --------------------------------------------------------------------------------
(12)    TYPE OF REPORTING PERSON*
        IN
- --------------------------------------------------------------------------------
(1) Directly owned by Vulcan Ventures Incorporated. Paul G. Allen is the sole
shareholder of Vulcan Ventures Incorporated and may be deemed to have shared
voting and dispositive power with respect to such shares.

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




<PAGE>   3

- ----------------------                                      --------------------
CUSIP NO.                               13G                   PAGE 3 OF 8 PAGES
- ----------------------                                      --------------------

- --------------------------------------------------------------------------------
(1)     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
        Vulcan Ventures Incorporated        IRS ID No. 91-1374788
- --------------------------------------------------------------------------------
(2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) [ ]
                                                                         (b) [ ]
- --------------------------------------------------------------------------------
(3)     SEC USE ONLY
- --------------------------------------------------------------------------------
(4)     CITIZENSHIP OR PLACE OF ORGANIZATION
        State of Washington
- --------------------------------------------------------------------------------
                              (5)     SOLE VOTING POWER
                                      -0- shares
                              --------------------------------------------------
           NUMBER OF          (6)     SHARED VOTING POWER
             SHARES                   2,740,854 shares (1)
          BENEFICALLY         --------------------------------------------------
            OWNED BY          (7)     SOLE DISPOSITIVE POWER
              EACH                    -0- shares
           REPORTING          --------------------------------------------------
          PERSON WITH         (8)     SHARED DISPOSITIVE POWER
                                      2,740,854 shares (1)
                              --------------------------------------------------

(9)     AGGREGATE AMOUNT BENEFICALLY OWNED BY EACH REPORTING PERSON
        2,740,854 shares (1)
- --------------------------------------------------------------------------------
(10)    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                        [ ]
- --------------------------------------------------------------------------------
(11)    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        7.1%
- --------------------------------------------------------------------------------
(12)    TYPE OF REPORTING PERSON*
        CO
- --------------------------------------------------------------------------------
(1) Directly owned by Vulcan Ventures Incorporated. Paul G. Allen is the sole
shareholder of Vulcan Ventures Incorporated and may be deemed to have shared
voting and dispositive power with respect to such shares.

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>   4

ITEM 1 (a). NAME OF ISSUER: Harbinger Corporation

ITEM 1 (b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                      1277 Lenox Park Blvd.
                      Atlanta, Georgia  30319


ITEM 2 (a). NAME OF PERSON FILING: Paul G. Allen and Vulcan Ventures
        Incorporated

ITEM 2 (b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

                      110 - 110th Avenue N.E.
                      Bellevue, Washington  98004


ITEM 2 (c). CITIZENSHIP: Paul G. Allen is a citizen of the United States of
        America. Vulcan Ventures Incorporated is a corporation organized under
        the laws of the State of Washington.


ITEM 2 (d). TITLE OF CLASS OF SECURITIES: Common Stock, par value $0.0001 per
        share.


ITEM 2 (e). CUSIP NUMBER: 41145C103


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: not applicable.

        (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).

If this statement is filed pursuant to Rule 13d-1(c), check this box. [ ]


                               Page 4 of 8 Pages

<PAGE>   5

ITEM 4.        OWNERSHIP

        (a)    Amount Beneficially Owned:   2,740,854 shares (1)

        (b)    Percent of Class:  7.1% (1)

        (c)    Number of Shares as to which Such Person has:

                (i)     sole power to vote or to direct the vote -0- shares

                (ii)    shared power to vote or to direct the vote 2,740,854
                        shares (1)

                (iii)   sole power to dispose or to direct the disposition of
                        -0- shares

                (iv)    shared power to dispose or to direct the disposition of
                        2,740,854 shares (1)

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

        (1) Percentages are based upon 38,713,565 shares of Common Stock issued
and outstanding as of November 11, 1999, as reported in the Issuer's Quarterly
Report on Form 10-Q for the period ended September 30, 1999. Percentages based
on shares beneficially owned by Paul G. Allen and held indirectly through Vulcan
Ventures Incorporated, a company owned 100% by Mr. Allen.


ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS Not applicable.

        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

        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 5 of 8 pages

<PAGE>   6

                                   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.

                                            VULCAN VENTURES INCORPORATED



        February 11, 2000                   By: /s/ William D. Savoy
                                               ---------------------------------
                                               William D. Savoy, Vice President


        February 11, 2000                                     *
                                            ------------------------------------
                                            Paul G. Allen


                                           *By: /s/ William D. Savoy
                                               ---------------------------------
                                            William D. Savoy as Attorney-in
                                            Fact for Paul G. Allen pursuant to
                                            a Power of Attorney filed on August
                                            30, 1999, with the Schedule 13G of
                                            Vulcan Ventures Incorporated and
                                            Paul G. Allen for Pathogenesis,
                                            Inc. and incorporated herein by
                                            reference.


                                Page 6 of 8 Pages

<PAGE>   7

                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
       EXHIBIT                    DESCRIPTION
       -------                    -----------
<S>                     <C>
        99.1            Joint Filing Agreement

        99.2            Power of Attorney filed on August 30, 1999, with the
                        Schedule 13G of Vulcan Ventures Incorporated and Paul G.
                        Allen for Pathogenesis, Inc. (Incorporated herein by
                        reference.)
</TABLE>


                                Page 7 of 8 Pages


<PAGE>   1

                                  EXHIBIT 99.1

                             JOINT FILING AGREEMENT


                      We, the signatories of the statement to which this Joint
            Filing Agreement is attached, hereby agree that such statement is
            filed, and any amendments thereto filed by either or both of us will
            be filed, on behalf of each of us.

            Dated:  February 11, 2000.

                                            VULCAN VENTURES INCORPORATED



                                            By: /s/ William D. Savoy
                                               ---------------------------------
                                               William D. Savoy, Vice President


                                                              *
                                            ------------------------------------
                                            Paul G. Allen


                                           *By: /s/ William D. Savoy
                                               ---------------------------------
                                            William D. Savoy as Attorney-in
                                            Fact for Paul G. Allen pursuant to
                                            a Power of Attorney filed on August
                                            30, 1999, with the Schedule 13G of
                                            Vulcan Ventures Incorporated and
                                            Paul G. Allen for Pathogenesis,
                                            Inc. and incorporated herein by
                                            reference.




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