Unless otherwise specified, Symantec statements of support apply to all updates, editions, and Service Packs (SPs) for a listed Windows version, e.g. Windows 2008 = Windows 2008 Standard, Enterprise, Datacenter, Web Server, Foundation etc.

Which versions of Symantec Endpoint Protection are supported on Windows 7 SP1 and Windows Server 2008 R2 SP1?
Symantec Endpoint Protection 11.0 Release Update 7 (RU7) and Symantec Endpoint Protection 12.1 or higher is supported on Windows 7 SP1 and Windows Server 2008 R2 SP1. For information on getting the latest release, read the document Obtaining the latest version of Symantec Endpoint Protection or Symantec Network Access Control.

Which versions of Symantec Endpoint Protection are supported on Windows 7 and Windows Server 2008 R2?
Symantec Endpoint Protection 11.0 Release Update 5 (RU5) or higher is supported on Windows 7 and Windows Server 2008 R2. All previous versions of Symantec Endpoint Protection will not run on Windows 7 or Windows Server 2008 R2. For information on getting the latest release, read the document Obtaining the latest version of Symantec Endpoint Protection or Symantec Network Access Control.

Which versions of Symantec Network Access Control are supported on Windows 7 and Windows Server 2008 R2?
Symantec Network Access Control/Network Access Control Starter Edition 11.0 Release Update 5 (RU5) or higher is supported to run on Windows 7 and Windows Server 2008 R2. All previous versions of Symantec Network Access Control will not run on Windows 7 or Windows Server 2008 R2. For information on getting the latest release, read the document Obtaining the latest version of Symantec Endpoint Protection or Symantec Network Access Control.

Note: There is an error in the Windows 7 compatibility database that causes Windows 7 to flag Symantec Network Access Control 11.0.5 RU5 as incompatible, even though RU5 is fully compatible with Windows 7. The error only appears in the Event Log, and does not prevent installation. For more information, read the document Error: "Symantec Network Access Control is incompatible with this version of Windows" on Windows 7.

Which versions of Symantec Endpoint Protection Small Business Edition will supported on Windows 7 and Windows Server 2008 R2?
Symantec Endpoint Protection Small Business Edition 12.0 Release Update 1 (RU1) or higher is supported on Windows 7 and Windows Server 2008 R2. All previous versions of Symantec Endpoint Protection Small Business Edition will not run on Windows 7 or Windows Server 2008 R2.

Which versions of Symantec AntiVirus are supported on Windows 7 and Windows Server 2008 R2?
Symantec AntiVirus Corporate Edition 10.2 MR3 and later are supported on Windows Server 2008 R2. All previous versions of Symantec AntiVirus will not run on Windows Server 2008 R2. Symantec AntiVirus Corporate Edition is not supported on Windows 7.