The best way to check is to check it yourslef.
On a machine where Exchange 2010 is insatlled install SEP 12.1 and look under
HKEY_LOCAL_MACHINE\Software\Symantec\Symantec Endpoint
Protection\AV\Exclusions registry. You must not edit this registry directly. On
64-bit computers, look in
HKEY_LOCAL_MACHINE\Software\Wow6432Node\Symantec\SymantecEndpoint Protection\AV\Exclusion