On January 5, 2015, Symantec Endpoint Protection (SEP) 11.x will reach of support, including all maintenance packs and patches. SEP 11.x was released in 2007. The product version entered into extended support, or Limited Support, as Symantec calls it, on January 5, 2014.

Symantec is advising customers to quickly move to SEP 12.1.x since the security landscape has changed considerably since the 2007 release. Since the product version entered into Limited Support no further development has been provided.

There is no cost to upgrade for customers with a current maintenance contract.

Useful resources:

Supported upgrade paths

Best practices for upgrading to the latest version of Symantec Endpoint Protection 12.1.x

Upgrading or migrating to Symantec Endpoint Protection 12.1.3 (RU3)

Feature mapping between 11.x and 12.1 clients