Eh, not much to say. I am evaluating various alternatives to MS Exchange and this is one of them.
I am documenting my experience evaluating Zimbra here: My Notes for Installing Zimbra 7.1.2 on Ubuntu 10.04
LHammonds 12:59, 29 September 2011 (PDT)
Actually, we decided to go with Zimbra so now I am documenting the conversion here: My Notes for Installing Zimbra OSE on Ubuntu Server 10.04 LTS
LHammonds 20:21, 26 April 2012 (PDT)