Forum Discussion
Enable AD Connect sync with existing Office 365 accounts and mailbox
You should have done the directory sync before you started the mailbox migration.
The easiest way to do this for 60 users is described at https://support.office.com/en-us/article/use-minimal-hybrid-to-quickly-migrate-exchange-mailboxes-to-office-365-fdecceed-0702-4af3-85be-f2a0013937ef?ui=en-US&rs=en-US&ad=US
But since you did not do that, see https://support.microsoft.com/en-us/help/2641663/how-to-use-smtp-matching-to-match-on-premises-user-accounts-to-office to get these cloud accounts connected to the on-premises accounts
Hello Dean
I wanted to followup on this thread. We are in the process of a similar migration. My question is since the Microsoft Office 365 license was originally issues in Office online 365 and now its being re-issues to on-premise account AD , what will the end user desktop experience be? Will they be prompted / required to re-logon to their Microsoft account once they reopen Outlook? I reason I ask is because we have 152 users who will be in this same scenario and having 152 users all at once being prompted for credentials is very time consuming to support.
Any thoughts to this will be welcomed, thank you.
Jerry