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Exchange mailbox not accessible

sglee asked
Last Modified: 2018-04-17
 Yesterday I had to power down SBS2011 because it was frozen. During next several reboot, it performed CHKDSK and found/fixed a lot of corrupted files.
 When I logged in to SBS2011 server finally, Exchange mailbox database failed to mount. Microsoft Engineer got the mailbox database mounted after repair work.
 Now there is one user who can't open Outlook. When I try to send email to him internally (via Exchange server), It get this message:

Mike xxx (Mxxxx@domain.com)
There's a problem with the recipient's mailbox. Please try resending the message. If the problem continues, please contact your helpdesk.

Since this user's outlook runs in Cache mode, I see .OST file on C drive, so I opened his Outlook and started exporting it to create PST file just in case.

What options do I have at this point to bring back this user's mailbox?

(1) I do have Windows server backup as of two nights ago. (2) I know his Outlook on his computer  has every single email up to the server crash yesterday afternoon. (3) I am creating a PST file right now from his Outlook.

User Mailbox on ExchangeMailbox Options
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