O365 to Exchange on-prem migration error
When you attempt to migrate an O365 user back to Exchange 2010 on-prem you may receive this error: “You shouldn’t migrate mailbox ‘Paul Demmer’ to Exchange 2010 or an earlier version while the user’s Instant Messaging contact list is stored in Exchange. If you do, the user could permanently lose access to their Instant Messaging contact list, which will cause […]
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