Scenario: When offboarding a mailbox, you receive the following error:
“You cannot migrate mailbox off of Office365 while the mailbox has a connected account enabled.”
Solution: You will have to remove the subscription before offboarding the mailbox.
First, check the subscription to make sure its not anything that’s going to affect the user:
get-subscription –mailbox stevem| FL IncomingServer, SubscriptionType, *Status*, LastSuccessfulSync,IncomingUserName
If it all looks good, run the following to remove the subscriptions:
get-subscription -mailbox stevem | Remove-subscription
Ex-Shell 