I have a customer that wants to migrate their users primary mailboxes from Exchange 2016 to Office 365-Exchange Online but leave their archive mailboxes on-prem.

I haven't been able to decipher what little I've found on this topic into a clear answer. Anyone know for certain whether this is a supported scenario?

To be clear this customer has not yet migrated, when they do they will be syncing AD and in a Hybrid relationship.

Thanks in advance for help!!!

Prince Vultan
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  • What is the benefit here? The user need to pay then for two licenses (Exchange Online and On-Premises). – BastianW Mar 14 '17 at 23:06

1 Answers1


No, it is only possible to do this the other way around.


  • Your mailbox can be on-prem with an archive on-prem
  • Your mailbox can be on-prem with an archive in Exchange Online
  • Your mailbox can be in Exchange Online and also your archive can be in Exchange Online


  • Is this answer wrong? I note its been downvoted, but it seems to be the only answer. – Dave Mar 03 '22 at 04:40