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TargetUserAlreadyHasPrimaryMailboxException Error - Stumped on how to solve

Anonymous
2024-01-30T13:34:35+00:00

Good Morning all,

I'm looking for some insight on how various organizations have solved this issue when migrating users.

For reference we have a handful of users that had an Exchange Online license turned on when they were assigned a license manually (no longer doing manual assignments for good reason). Some of these users are admins and cannot afford to have their 365 data wiped, although their mailboxes being wiped would be fine.

The mentioned users get the dreaded TargetUserAlreadyHasPrimaryMailboxException error when being migrated.

Any tricks for removing mailbox cleanly and being able to migrate these users would be greatly appreciated!!

Sincerely,

Bill

Microsoft 365 and Office | Install, redeem, activate | Other | Other

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2024-01-30T14:22:03+00:00

    Hi, I'm Diane and I'm happy to help you today.

    Sorry to hear you're experiencing this issue.

    Have you seen this article and tried the steps? https://learn.microsoft.com/exchange/troubleshoot/move-mailboxes/offboarding-mailbox-fails-homemdb-homemta

    Please note, this Community primarily provides consumer support and your question is focused on an enterprise product, the new Q&A forums are better suited for these questions.

    https://learn.microsoft.com/en-us/answers/

    Unfortunately, moderators are unable to move messages to that forum, so you'll need to repost it.

    Let me know how it goes, I'm here to help you further if needed.

    -- Diane

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