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                                                                    EXHIBIT 10.3

                  SIXTH AMENDMENT TO THE HARBINGER CORPORATION
                   AMENDED AND RESTATED 1993 STOCK OPTION PLAN
                           FOR NON-EMPLOYEE DIRECTORS

         THIS SIXTH AMENDMENT TO THE HARBINGER CORPORATION AMENDED AND RESTATED
1993 STOCK OPTION PLAN FOR NON-EMPLOYEE DIRECTORS (the "Amendment") is made
effective as of the 25th day of April, 2000 (the "Effective Date"), by HARBINGER
CORPORATION, a corporation organized and doing business under the laws of the
State of Georgia (the "Company"). All capitalized terms in this Amendment have
the meaning ascribed to such term as in the Harbinger Corporation Amended and
Restated 1993 Stock Option Plan for Non-Employee Directors (the "Plan"), unless
otherwise stated herein.

                              W I T N E S S E T H:


         WHEREAS, the Board of Directors of the Company desires to amend the
Plan to increase the number of shares that may be granted under the Plan.

         NOW THEREFORE, in consideration of the premises and mutual promises
contained herein, the Plan is hereby amended as follows:

         SECTION 1. Section 2 of the Plan is hereby amended by deleting the
first sentence of Section 2 of the Plan in its entirety and substituting in lieu
thereof the following:

                           2.       SHARES SUBJECT TO THE PLAN. Subject to
         adjustment as provided in Section 6, the total number of shares of
         $.0001 par value common stock (the "Common Stock") of the Company for
         which options may be granted under the Plan (the "Shares") shall be
         875,000 less the number of Shares of Common Stock issuable pursuant to
         options granted under the Restated 1992 Stock Option Plan for
         Non-employee Directors."

         SECTION 2. Except as specifically amended by this Sixth Amendment, the
Plan shall remain in full force and effect as prior to this Sixth Amendment.

         IN WITNESS WHEREOF, the Company has caused this Sixth Amendment to the
Harbinger Corporation Amended and Restated 1993 Stock Option Plan for
Non-Employee Directors to be executed on the Effective Date.

                                              HARBINGER CORPORATION

                                              By:
                                                 ------------------------------
                                                     James M. Travers
                                              Title: CEO

         ATTEST:

         By:
            --------------------------
                Loren B. Wimpfheimer
         Title: Secretary