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                                                                   EXHIBIT 10.18

                     AMENDMENT NO. 2 TO EMPLOYMENT AGREEMENT

This Amendment No. 2 to Employment Agreement (this "Amendment") is made and
entered into by and between FTP Software, Inc., a Massachusetts corporation (the
"Company"), and Peter R. Simkin ("Employee"), effective as of the 15th day of
December, 1996.

WHEREAS, the Company and Employee have entered into an Employment Agreement
dated as of the Effective Time (as defined in that certain Amended and Restated
Agreement and Plan of Merger, dated as of May 21, 1996, among the Company,
Firefox Acquisition Corp. and Firefox Communications Inc.), as amended by
Amendment No. 1 to Employment Agreement effective as of August 22, 1996 (as so
amended, the "Agreement"); and

WHEREAS, the Company and Employee desire to further amend the Agreement;

NOW, THEREFORE, in consideration of the premises and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereby agree as follows:

1. AMENDMENTS. Section 5.g.i. of the Agreement is hereby amended by adding the
words "to two times" immediately before the words "the greater of" appearing in
the seventh line thereof.

2. EFFECT ON AGREEMENT. Except as specifically amended hereby, the Agreement
shall continue in full force and effect.

IN WITNESS WHEREOF, this Amendment has been executed as a sealed instrument by
the Company, by its duly authorized representative, and by Employee, effective
as of the date first above written.

EMPLOYEE:                               FTP SOFTWARE, INC.


                                        By:
- -----------------------------------        ----------------------------------
         Peter R. Simkin                   Glenn C. Hazard
                                           President and Chief Executive Officer