Exchange Online Shared Mailbox Migration

Simon Auty 41 Reputation points


I'm in the middle of an on-premises to Exchange Online migration. All is going well and I've just migrated the first few shared mailboxes.

I was surprised to see the shared mailboxes listed both on-premises AND in Exchange online even though they have been migrated. Is this normal behaviour? I assumed that when migrated to the cloud they would no longer appear in on-premices ECP.


Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. KyleXu-MSFT 25,616 Reputation points

    @Simon Auty

    For migrated shared mailbox, it AD account still hosted/managed on local AD, then sync to AAD.

    This shared mailbox will changed to remote mailbox on Exchange on-premises, in this way, you will could manage this shared mailbox from Exchange on-premises.

    You also could find those shared mailboxes with command below:

    Get-RemoteMailbox | where{$_.RemoteRecipientType -eq "Migrated, SharedMailbox"}  

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  1. Vasil Michev 62,236 Reputation points MVP

    That depends on the method of migration, generally speaking. It's normal to see migrated mailboxes represented as "remote mailbox" within the on-premises EAC, if doing hybrid. If doing other migration types, it's not uncommon to end up with "duplicate" mailboxes, one usually performs a cleanup in the source environment once it's confirmed that all data was migrated successfully.

  2. Amit Singh 3,331 Reputation points
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  3. Simon Auty 41 Reputation points

    All good now, thanks to everyone.

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