What happens when I receive a "Migration Re-Attempt Needed" message?

Your e-mail is important to you; it's also important to us to ensure that when we migrate message to the Office 365 server that they transfer with 100% reliability. We automatically detect errors during the migration and if even a single message or folder doesn't get transferred then we do not consider it a success. We send two e-mails to you during the migration - the first to announce that we have begun migrating your account and the 2nd to indicate if it was a success or if it needs to be re-attempted to resolve errors. If you received a follow-up message indicating your account migration needs to be re-attempted then you should continue using your U-Mail account as-is and know that another attempt to migrate your account will take place in 1-3 days.