Solved Your mailbox appears to be unavailable.

Q. Your mailbox appears to be unavailable. Try to access it again in 10 seconds. If you see this error again, contact your helpdesk." when trying to log in.

If you had a powerfailure Start below services and make sure all Exchange services are started: It will also show mailbox database is "Unknown" in mounted column.:

Microsoft Exchange Information Store

Microsoft Exchange Replication


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