Delegates - if you have delegates or are a delegate, you must all be on the same system.That will effectively sign you out of O365 and prevent anybody else from being able to access your account from any shared workstations. We recommend closing the tab/window and quitting your browser entirely. O365 web signs me back in when I try to sign out - Some O365 web users find that when they try to sign out of O365 that it takes them through the sign out sequence, then automatically initiates a sign in sequence that delivers them right back where they started.If that doesn't resolve the issue delete your MIT Exchange account (Settings > Mail, contacts, calendar > Your Exchange Account > Delete account (scroll down to the bottom)] and recreate it. iPhone calendar and email blank after migration - Double check that you've updated your username.Go to Mailbox > Take All Accounts Online.Go to Mailbox > Take All Accounts Offline.To toggle the accounts offline and online again: It will download new messages when the application is first opened or if you toggle the accounts offline and then online again. Apple Mail won't sync new messages - Some users have reported that Apple Mail has stopped syncing new messages, even when specifically requested to sync the mailbox.Office 365 - Email and Calendaring - Apple Mail and iCal Configuration.To delete your account and create a new one, see: This may take quite some time depending on the size of your inbox. You have to delete your old account and create a new one using your full email address username This has the unfortunate result that your inbox will need to fully re-sync causing you to have to re-download all your mail stored on the servers. Apple Mail - Apple Mail will not allow you to edit your username or server name on an existing account.

Office 365 - Email and Calendaring - How do I check or update my username?.

If you discover any additional issues, please contact the O365 Team at Office 365 Usernames - Office 365 username field must be in a fully qualified domain format username If username is not in a fully qualified domain format then your account will not sync with Office 365.

These are the known issues with the Office 365, Exchange Online, beta currently being undertaken by IS&T staff. If you're not sure which system you're using, see: How do I tell if my email and calendaring data is on the Exchange On Prem Server or using Office 365? If you're looking for Exchange Email and Calendaring on the Exchange On Prem Server, see: MIT Email Setup Landing. This article refers to the Office 365 Email and Calendaring.

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