What is the Exchange database unknown error?
Businesses all over the world use Exchange servers for email exchange and communication. Normally when an Exchange database is healthy and mounted on the Exchange server, users can access their mailboxes and messages. The database may also be dismounted or the Exchange server might encounter Jet engine errors, in which case users will be unable to access their mailboxes. However, in some cases, the Exchange database displays the status as unknown. When you check its status from the Exchange admin center (EAC) or PowerShell cmdlets, you may see the error message 'Exchange database status unknown.' Even when the database is mounted, the error 'Content index state: Unknown' can occur, affecting Exchange server performance and email flow to and from mailboxes. When the Exchange server is not a part of any DAG environment, there is no automatic database recovery and you must manually resolve the errors in such cases.
The following are some of the reasons for Exchange database unknown error
- The Exchange database is corrupted or damaged
- The Exchange server services are not running
- The database is renamed from the Exchange admin center