Forum Discussion
Migrate on-premise mailboxes to existant online users
Hello, We have to migrate on-premise Exchange 2010 mailboxes to Exchange Online, but the problem is that the customer already has created cloud users with mailboxes using the free teams explanatory ...
You can remove the Exchange license and wait for the mailbox to be deprovisioned. And follow the steps here: https://techcommunity.microsoft.com/t5/exchange-team-blog/permanently-clear-previous-mailbox-info/ba-p/607619
cruizmct
You would have to do some matching between on-prem and cloud.
https://support.microsoft.com/en-us/help/2641663/use-smtp-matching-to-match-on-premises-user-accounts-to-office-365
