I just successfully rescued an abandoned opensource zimbra install. Previous admin has left the island and he left some odd things. First off its running Ubuntu 32 bit kernel on a 64 bit virt hardware. No problems though.
I just upgraded it to the latest 6.07 and now want to go to the network edition. I am guessing a trial edition won't work here (50 users cap)???
Gotta say I am liking this product so far!