Exchange server 2016 database changed to unkown state status

Benard Mwanza 996 Reputation points
2021-12-06T04:39:21.6+00:00

I recently moved by exchange databases from Ex1-2016 to another Ex2-2016. Using this guidelines.
https://learn.microsoft.com/en-us/exchange/high-availability/disaster-recovery/database-portability?view=exchserver-2019

Ex2-2016 is the only box configured to send and receive emails.

From Ex1-2016, i Left the database status as Dismounted status, later on the database status changed to unknown. A user was mistakenly created in a stale database that exists in Ex1-2016, and I'm unable to move the user to a production database that exists in Ex2-2016

Note:
Ex1-2016 is still operational but not being used to send and receive emails.

When i try to mount the stale database in Ex1-2016, i get the following error.
155078-snip.png

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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Accepted answer
  1. Andy David - MVP 138K Reputation points MVP
    2021-12-06T14:01:24.527+00:00

    Was this a DAG in DAC mode?

    If so, you can try:

    Start-DatabaseAvailabiltyGroup -MailboxServer Ex1-2016
    

    and see if that lets you then mount that DB


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