Is Symantec Mail Security for SMTP 4.0 the new version of Symantec AntiVirus for SMTP Gateways 3.1? I got some cd's from Symantec yesterday, and I am a bit confused. Can someone tell me if there is a difference between these two products? I have Symantec AntiVirus for SMTP Gateways 3.1 installed, is there any point in installing Symantec Mail Security for SMTP 4.0 instead, or as an additional software?