Hi,
On July 4, 2012, SAV 10.x and SCS 3.x reached End of Support Life (EOSL). This includes ALL maintenance packs and patches.
We recommend you upgrade to the latest version of Symantec Endpoint Protection, which as of today is version 12.1 RU2 MP1.
There is no cost to upgrade for customers with a current maintenance contract; However you may find that additional or updated hardware is required.
Use the latest SEP version and stay protected.
Reference: https://www-secure.symantec.com/connect/forums/symantec-antivirus-10x-sav-will-reach-end-support-life-eosl-july-4-2012