> Nothing that's free and Open Source will connect to Exchange > without major > trouble. Learning Linux just for letting a box scan for spam > isn't so much > work. And it's way cheaper and faster than any other solution > I know of.
In my limited experience i'd agree with that.. and most of the free stuff (AV especially) for Windows has restrictions that stop you using it in a commercial environment. I'd say that getting an old box setup with *nix/Postfix/spamassassin isn't an overly hard job, though getting it to interface with an AV such as clam needs a little more work as you tend to have to do some "glueing" with something like amavis in between. regards, Paul