How to migrate shared mailbox from exchange 2016 to exchange online

Sanchez Menor, Jose Antonio 116 Reputation points
2021-04-05T10:56:32.657+00:00

Hello, we're working in an Hybrid architecture, with exchange 2016 CU18 Server and Exchange Online. I've had to migrate more than 200 mailboxes shared from on-prem to exchange on-line. How can I do to move them and keep the same permissions that the users have on prem now?
Thanks a lot.

Jose Antonio Sánchez

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Accepted answer
  1. Andy David - MVP 141.1K Reputation points MVP
    2021-04-05T11:28:29.147+00:00

    Yes, permissions will be retained .
    You may need to re-do SEND AS perms if they have any of those however.

    https://learn.microsoft.com/en-us/exchange/permissions#mailbox-permissions-and-capabilities-not-supported-in-hybrid-environments
    https://learn.microsoft.com/en-us/exchange/troubleshoot/send-emails/overview-delegation-office-365-hybrid

    From what I have seen, if you are using the latest version of AADConnect and Perms are set now, they will continue to work after you move the mailbox to 365.

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