Recieved a "Warning" when getting ready to move remaining arbriation mailboxes. Whats this mean?

BCL 831 Reputation points
2021-05-20T17:56:20.1+00:00

Warning

The object domain.com/Microsoft Exchange System Objects/SystemMailbox{056311A3-31AB-4FD4-A6DF-8B9C45F1A639} has been corrupted or isn't compatible with Microsoft support requirements, and it's in an inconsistent state. The following validation errors happened:

--------------------------------------------------------------------------------

Database is mandatory on UserMailbox.

The above system mailboxes doesn't list a database.
It's display name is teh same as the email address, which is SystemMailbox{056311A3-31AB-4FD4-A6DF-8B9C45F1A639}@keyman .com

There are 2 other system mailboxes that list MS Exchange as the display name and then have unique systemMailbox email addresses and they each have different databases. One is of 2013ec and teh other 2019ex.

What is this warning and I assume I don't want to migrate it.
Thanks.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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2 answers

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  1. Andy David - MVP 138.4K Reputation points MVP
    2021-05-20T20:05:38.607+00:00

  2. Zhengqi Lou-MSFT 8,856 Reputation points Microsoft Vendor
    2021-05-21T06:45:53.503+00:00

    Hi @BCL ,

    Did you run the cmdlet get-mailbox -arbitration on both Exchange 2013 and 2019?

    I checked the docs about Arbitration mailbox, and didn't found the SystemMailbox{056311A3-31AB-4FD4-A6DF-8B9C45F1A639}.

    I think you could try the method in the article provided by Andy. And you can do what the Exchange Deployment Assistant suggests:
    98521-image.png

    Best regards,
    Lou


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