* July 2004 TurnTide Acquisition
   * June 2004 Brightmail Acquisition
   * February 2004 ON Technology Corp. Acquisition
   * December 2003 PowerQuest Corporation Acquisition
   * October 2003 Safeweb, Inc. Acquisition
   * August 2002 Riptech, Inc. Acquisition
     Recourse Technologies Acquisition
     SecurityFocus Acquisition
   * July 2002 Mountain Wave Acquisition
   * October 2001 Lindner & Pelc Acquisition
   * July 2001 Foster-Melliar Acquisition
   * December 2000 AXENT Technologies Acquisition
   * February 2000 L-3 Network Security Acquisition
   * December 1999 ACT! and Visual Café Divestiture
   * July 1999 URLabs Acquisition
   * November 1998 Quarterdeck Corporation Acquisition
   * September 1998 Acquisition of Intel's antivirus business and systems management technology
   * June 1998 Binary Research Limited (Ghost) Acquisition
   * May 1998 Acquisition of IBM's antivirus business and immune system technology
   * November 1995 Delrina (WinFax) Acquisition
   * June 1994 Central Point Software Acquisition
   * August 1990 Peter Norton Computing, Inc. Acquisition 
