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JulianHaines1's avatar
JulianHaines1
Copper Contributor
Sep 25, 2025
Solved

Migrating on-prem functional shared mailboxes to 365

I have an on-premises Exchange environment (SE Edition) with Edge servers, configured in a hybrid setup. New users are provisioned directly in Office 365, but many legacy users still exist solely on-...
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  • VasilMichev's avatar
    VasilMichev
    Sep 25, 2025

    If you still have users (and mailboxes?) on both sides, it's best to go the first route, as it preserves interoperability. If all the mailboxes are already in the cloud and you don't care about what object type remains on-premises for the shared mailbox, you can do the recreation. It does not cover the content of the mailboxes though, and I'm assuming you'd want to keep that. Which means either manual export/import, third-party tool or getting back to the first scenario :)

VasilMichev's avatar
VasilMichev
MVP
Sep 25, 2025

If you still have users (and mailboxes?) on both sides, it's best to go the first route, as it preserves interoperability. If all the mailboxes are already in the cloud and you don't care about what object type remains on-premises for the shared mailbox, you can do the recreation. It does not cover the content of the mailboxes though, and I'm assuming you'd want to keep that. Which means either manual export/import, third-party tool or getting back to the first scenario :)

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