Microsoft came up with this command: New-MailboxRepairRequest
it is capable of repairing individual mailboxes as well as whole database while it is online. Per Microsoft the disruption will be impacting just users who have their mailboxes corrupted or damaged.
Well, that's good thing to know, but what I need to understand is when whole or a lot of mailboxes in a database are corrupt, it will make sense to use spare database and restore from last night backup to the spare database to let users do their work (without being able to access today's emails), and dismount the corrupt database and repair it with: New-MailboxRepairRequest .
However I did not see anywhere on the internet where Microsoft mentions whether the command New-MailboxRepairRequest is able to repair a dismounted database or the database has to be mounted.
To my understanding you cannot have 2 same databases(same mailboxes) mounted.
Any idea ?