1 SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 10-Q/A (Mark One) [x] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 1998 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-27900 ISOCOR(R) (Exact name of Registrant as Specified in Its Charter) California 95-4310259 (State or Other Jurisdiction of (I.R.S. Employer Incorporation or Organization) Identification No.) 3420 Ocean Park Blvd., Santa Monica, CA 90405 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (310) 581-8100 Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [ ] 9,822,225 Shares of Common Stock of the Registrant were outstanding as of September 30, 1998 The undersigned is hereby filing Exhibit 10.21 to its Quarterly Report on Form 10-Q for the quarter ended September 30, 1998, which exhibit was previously omitted. 1 2 PART II Other Information Item 6. - Exhibits and Reports on Form 8-K (a) The following exhibits are filed as part of this Quarterly Report on Form 10-Q: 10.21+ Software License Agreement between the Registrant and Netscape Communications Corporation dated September 30, 1998 27.1 Financial Data Schedule. + Confidential Treatment Requested. (b) No reports on Form 8-K have been filed during the quarter for which this report has been filed. 3 3 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report on Form 10-Q/A to be signed on its behalf by Janine M. Bushman, thereunto duly authorized to sign on behalf of the registrant and as the principal financial officer thereof. ISOCOR Date: January 27, 1999 By: /s/JANINE M. BUSHMAN ------------------------------------ Janine M. Bushman, Vice President, Finance and Administration, and Chief Financial Officer (Principal Financial and Accounting Officer) 4 4 INDEX TO EXHIBITS Exhibit Number Exhibits Page - ------------------------------------------------------------------------------- 10.21 Software License Agreement between the Registrant and Netscape Communications Corporation dated September 30, 1998 ........................................ 5 27.1 Financial Data Schedule ................................... 36 5