I really need to either upgrade my Scalix server or replace it. It has to be: Free Integrated with anti-spam IPv6 support optional anti-virus (processing concerns) I don't have to be able to port mail from the Scalix to the new server. Everyone can just POP their mail. I have read a bit about Zimbra, it comes as a tar for rhel 5. No rpm that I can find. I also found SME, I have a LOT of questions about it, and am asking on their forum board. Anything else out there I should look for?