The upgrades to the mail system continue.
We are about to begin migrating users from the old Zimbra mailstores to the new and improved Zimbra mailstores. The migration project will occur during the overnight hours starting this Saturday, 8/23/2014 and continue each evening until the entire campus is converted.
The migration should be quite transparent except for a minute or two of outage when your account is being moved.
The migration should not require you to modify any configurations in any of your devices or mail clients.