Forum Discussion
Shared mailboxes automapping broke and cannot be removed after hybrid migration
We migrated a user from Exchange to Office 365. The shared mailbox is still on premises in Exchange. The full access is working and i can see that the user can still open the mailbox via OWA (open an...
Automapping is NOT supported cross-premises, it's clearly mentioned in the documentation and you should have planned around it. Anyway, apart from recreating the Outlook profile for any of the affected users, you can try to manually edit the automapping attributes as detailed for example here: http://techgenix.com/mailbox-auto-mapping-exchange-server-2010-part2/
Another thing to try is to "reset" automapping via the –ClearAutoMapping switch for Remove-MailboxPermission. I'm not sure however whether this cmdlet made it to on-premises, so it might not be available for you. If it is, be aware that running it will clear the automapping for all users that currently have access to said mailbox, you cannot designate a single delegate with it.
- As in not supported either way e.g. user mailbox on-prem with shared mailbox in cloud and/or user mailbox in cloud and shared mailbox on-prem ?
