SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                     FORM 15

Certification and Notice of Termination of Registration under Section 12(g) of
the Securities Exchange Act of 1934 or Suspension of Duty to File Reports Under
Sections 13 and 15(d) of the Securities Exchange Act of 1934.

                        COMMISSION FILE NUMBER: 000-26298



                              HARBINGER CORPORATION
             (Exact name of registrant as specified in its charter)

                1277 LENOX PARK BOULEVARD, ATLANTA, GEORGIA 30319
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                    COMMON STOCK, $0.0001 PAR VALUE PER SHARE
            (Title of each class of securities covered by this Form)

                                      NONE
  (Titles of all other classes of securities for which a duty to file reports
                      under Section 13(a) or 15(d) remains)



         Please place an X in the box(es) to designate the appropriate rule
provision(s) relied upon to terminate or suspend the duty to file reports:


                Rule 12g-4(a)(1)(i)  |X|           Rule 12h-3(b)(1)(ii)  |_|
               Rule 12g-4(a)(1)(ii)  |_|            Rule 12h-3(b)(2)(i)  |_|
                Rule 12g-4(a)(2)(i)  |_|           Rule 12h-3(b)(2)(ii)  |_|
               Rule 12g-4(a)(2)(ii)  |_|                     Rule 15d-6  |_|
                Rule 12h-3(b)(1)(i)  |_|

         Approximate number of holders of record as of the certification or
notice date: ONE (1)

         Pursuant to the requirements of the Securities Exchange Act of 1934,
Harbinger Corporation has caused this certification/notice to be signed on its
behalf by the undersigned duly authorized person.



Date:  June 16, 2000                    By:  /s/ Richard T. Nelson
                                           -------------------------------------
                                           Richard T. Nelson
                                           President and Chief Executive Officer