Question : What is the best anti-spam software for a 50 user exchange server

What is the best anti-spam software for a 50 user exchange server?   Are there any comprehensive reviews of solutions out there?

Something that would have stopped the stuff that came out of computers infected with the Sobig virus?

thanks in advance,

Answer : What is the best anti-spam software for a 50 user exchange server

For anti spam I suggest GFI mail Essencials 9
You can download the trial version at gfi.com
I'm getting allot of worms from spammers, this product works great.
Black/White list, body/attachment/subject key word/phrase/and-or scanning, DNSBL and BOOLEAN.
I tried several spam solutions over a 6 month period, GFI just plain kicks but!

Be sure to get an anti virus solution on the server for both exchange and for general file protection.
I like trend for Exchange download the trial here
http://www.trendmicro.com/en/products/email/smex/evaluate/overview.htm

I like Norton small business v8 for the real time file scanning.
Don't check mail from the server unless you have a client solution.

Jim