Ok, I have setup a zimbra box that successfully auths to AD. I have run the exchange migration wizard and selected all the users to migrate. It then successfully provisions all of the accounts in zimbra. However, the system just sits there for hours and hours trying to migrate a single user and the files in the temp directory get HUGE (about 6 GB for a mailbox that is only 3 GB).
I am also getting the error about not being able to import the calendar stuff. That is something I'd like to get fixed, but it's not critical.
I have successfully imported a couple of accounts using ExMerge, but it's not as good as the Zimbra tool would be, since it doesn't allow me to sort the messages my conversations, etc.