Depends.
Are you using AADConnect or ADFS? If so then, yes to be supported you have to have at least one on-prem Exch Server ( this will hopefully not be the case one day)
This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
Hello
I'm in the middle of a migration for Exchange 2010 to Office 365. Once the mailboxes are migrated and I am ready to decommission the Exchange 2010, do I still need a new Hybrid server on prem to manage the mailboxes?
Depends.
Are you using AADConnect or ADFS? If so then, yes to be supported you have to have at least one on-prem Exch Server ( this will hopefully not be the case one day)
Hi @KashifRashid-5415 , agree with Andy suggests.
If you use AAD sync, your synced online users can only be managed within on-premise AD, as a result, it is necessary to keep an on-premise Exchange server to manage user’s mailbox. Like the Scenario two in the official document.
And if you have all of the mailboxes in Exchange Online and do not need to manage users from on-premises and no longer have a need for directory synchronization or password synchronization. You can safely disable directory synchronization and remove Exchange from the on-premises environment. Just like Scenario one introducees
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.