SSE Symantec Endpoint Protection 12.1 SSE+ Symantec Endpoint Protection 12.1 (August 2011) SSE+ Symantec Network Access Control 12.1 STS Symantec Endpoint Protection 12.1 SSE Symantec Backup Exec 2012 SSE+ Symantec Backup Exec 2012 STS Symantec Backup Exec 2012 SSE Symantec Endpoint Protection Small Business Edition 2013 SSE+ Symantec Endpoint Protection Small Business Edition 2013 STS Symantec Messaging Gateway 10.0