There are not a lot of things we need to do to the mail date before we migrate from Zimbra to Google in early July. However, there are two small housekeeping items that need to be addressed for a seamless transition.
If you've tried to follow the instructions for handling messages over 25MB and avoiding "INBOX/" label names but you still need help, you can put in a ticket by sending an email to email@example.com and someone will make an appointment to assist you. Please do this as soon as possible. We'd like to have the clean up phase complete by the end of May 2012.