A few days back I saw some chatter about email archiving software and what people are using. I have another piece of software I came across to add to the list. It's called MailArchiva and its open source. Here are the links.
http://sourceforge.net/projects/openmailarchiva/ http://www.mailarchiva.com/ Hope this helps. Mark Reimer IT System Admin American CareSource 972-308-6887