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Juakin's avatar
Juakin
Copper Contributor
May 08, 2020
Solved

Exchange Hybrid Mailbox Migration - RecipientNotFoundPermanentException

Exchange 2010 (14.3.468.0) is already setup as Exchange Hybrid with Office 365 and is working aswell.  Unfortunately some mailbox migration fail. RecipientNotFoundPermanentException: Error: Canno...
  • Juakin's avatar
    May 08, 2020

    Tried a lot of things to get this working.

     

    In the end this worked out.

     

    -Remove the Migration for the affected user.

    -Remove the Mail user from the Organization\Retention Hold setup in Security and Compliance.

    -Take backup of any OneDrive or any other data that exist for this user.

    -Move the user into non Syncing OU in On Premise Exchange.

    -Run the Delta Sync on the AAD connect Server Start-Adsyncsynccycle –PolicyType Delta

    -Remove the MSOL user from the Recycle Bin: Remove-MsolUser -UserPrincipalName mailto:user@contoso.com -RemoveFromRecycleBin –Force

    -Once done move the user back to syncing OU and run the Delta sync again on the AAD connect Server : Start-Adsyncsynccycle –PolicyType Delta

    -Once the new mail user is synced to Office 365 begin the migration again for the affected user

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