I agree with the Macro thing, we still use macros at the moment!
OK, its a database - but the principle is still the same. Just an AV Policy. We run SQL server and a email server (like exchange, its called DvISE from Tobit, anyone heard of it?) but theres no special software for AV protection.
I don't want to sound like a salesman, but Star guarentees no viruses will get through via email. Well, if your AV Policy is good then it won't be a problem? Ban floppys/CD's unless you've checked them - and emails will be clean. I'm sure you have a AV add on to Exchange (something like MIMEsweeper) but SP doesn't need such a thing.
Its not specifically recieveing anything from an external network unlike exchange. I don't know of any special products for SP and I doubt there will be one. Its a DB of file info, thats all. Think of it as SQL Server - you don't need anything aslong as you keep up to date with MS security patches (which can be a challenge by itself!) and update your DAT's on your AV app daily.
Steve Hewitt
Systems Manager