Hey Zimbra team,
Just wanted to thank you for making such an awesome product. I rolled out Zimbra 4 OS Edition to our 15 person office about a month ago and it's going really, really well. Of course, there are the users that always complain that it's not Outlook, but they'll learn to accept Zimbra once they get a little more used to it.
Very much looking forward to the Tasks/To-Do list feature in the next major release. Keep up the good work!
EDIT: Running Zimbra 4.03 on a Red Hat Enterprise Linux 4 server with dual core 3ghz CPUs and 2GB of RAM. The load average barely ever tops .15.