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Otttester-2464 asked AndyDavid edited

Exchange Migration to Cloud email move?

When migrating a mailbox to the cloud, are emails actually moved? How to explain that the mailbox moves and not the emails themselves?

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AndyDavid answered

The emails themselves are moved. A mailbox will be created on the destination database and then the messages are moved. After all the items are moved, the directory information is updated and cut over to the new mailbox. This is done "online" so the user is not locked out during the move itself.

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Otttester-2464 answered AndyDavid edited

Thank you, which directory information will be updated/changed exactly?

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The location of the mailbox. That is updated to reflect the new database.
You can see the steps in the move logs:
https://techcommunity.microsoft.com/t5/exchange-team-blog/digging-into-hybrid-migration-move-report-data/ba-p/1675064

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