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JasonHarding-6075 asked KyleXu-MSFT commented

On-Prem to Office 365 Migration

Hi there,

So after a migration of users from an On-Prem env to Office 365, most users were created, licensed and have their emails in their Cloud account now that were present when using just the On-Prem Exchange.

Office 365 shows these users and status is that of being sync'd from On-Prem which is what we want.

Problem:

A single user was listed in Office365, licensed but their Mail tab was saying that it was still hosted in the On-Prem environment.
I did some research and noticed a few posts regarding this where one needs to make the msExchMailboxGUID value to null and then resync.

This was done and the user now has an actual mailbox in Office365 where it shows usage and one can log into the OWA however their old emails are not present and when looking at their On-Prem AD Attributes, the msExhMailboxGUID is still empty.

So how would one correct? I need to get their mails from their On-Prem Exchange into their Cloud mailbox?

Kind Regards,
Jason

office-exchange-hybrid-itprowindows-server-migration
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1 Answer

KyleXu-MSFT avatar image
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KyleXu-MSFT answered KyleXu-MSFT commented

@JasonHarding-6075

Based on your description, I guess you may create a new Exchange online mailbox for this user by mistake(This use have two mailboxes now).

I would suggest you delete the Exchange online mailbox, then resync this mailbox AD account to AAD, then try to migrate mailbox again.

For safety, I would suggest you export data from Exchange on-premise mailbox for backup:

 New-MailboxExportRequest -Mailbox user -FilePath "\\SERVER01\PSTFileShare\user.pst"

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@JasonHarding-6075
I am writing here to confirm with you any update about this thread now?
If the above suggestion helps, please be free to mark it as an answer for helping more people.

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