Tag Archives: Office 365

Office 365 on-premises

Warning user’s on-premises mailbox hasn’t been migrated to Exchange Online I have been working with Office 365 for the last three days.  This error provided hours of enjoyment. There is no on-premise exchange server.  So WTF! After many hours of troubleshooting I have a resolution. Remove the synchronization of the attribute msExchMailboxGuid to Office 365 We… Read More »