Signature file updates ensure that your PC is protected from the latest viruses. It is very important to make sure that you have the latest signature on your PC.
As new threats emerge, Symantec immediately builds new Virus Definitions Updates and makes them available for download.
Note: The i32 Intelligent Updater package cannot be used to update Symantec AntiVirus Corporate Edition 8.0, 9.0, or 10.0 servers or Norton AntiVirus Corporate Edition 7.6 servers, but can be used to update Corporate Edition clients. The x86 Intelligent Updater package can be used to update Corporate Edition clients and servers.

External Mirror 1 & External Mirror 2 - Supports the following versions of Symantec antivirus software:
· Norton AntiVirus 2003 Professional Edition
· Norton AntiVirus 2003 for Windows 98/Me/2000/XP Home/XP Pro
· Norton AntiVirus 2004 Professional Edition
· Norton AntiVirus 2004 for Windows 98/Me/2000/XP Home/XP Pro
· Norton AntiVirus 2005 for Windows 98/Me/2000/XP Home/XP Pro
· Norton AntiVirus 2006 for Windows 2000/XP Home/XP Pro
· Norton AntiVirus 2007 for Windows XP Home/XP Pro/Vista
· Norton AntiVirus for Microsoft Exchange (Intel)
· Norton SystemWorks (all versions)
· Norton Utilities for Windows 95/98 (all versions)
· Symantec AntiVirus 3.0 for CacheFlow Security Gateway
· Symantec AntiVirus 3.0 for Inktomi Traffic Edge
· Symantec AntiVirus 3.0 for NetApp Filer/NetCache
· Symantec AntiVirus 8.0 Corporate Edition Client
· Symantec AntiVirus 8.1 Corporate Edition Client
· Symantec AntiVirus 9.0 Corporate Edition Client
· Symantec AntiVirus 10.0 Corporate Edition Client
· Symantec AntiVirus 10.1 Corporate Edition Client
· Symantec AntiVirus 10.2 Corporate Edition Client
· Symantec Mail Security for Domino 4.0
· Symantec Mail Security for Domino 5.0