I have recently deployed a few SCO Office Mail Server 2.0's into the field and I must say, they are working quite well. IMAP works incredibly fast, they are secure, and they self-configure for all versions of Outlook. My customers are happy.
I found the documentation to be a bit light, so in an effort to remedy this, I will soon have an installer's How-To that you can gain access to. For now, if you need help, go to my demographics page on this site and email me (having a little spam problem - no, my old sendmail here doesn't help, but I will soon be running SCO Office here as well.)
This mail server has filters and RBL service that makes spam less annoying. It also has the capability to integrate with a virus scanner at the server level.
Keep watching for the how-to.
