Users Mailbox is still quarantined after it should have been released automatically. Manually remove the quarantine.

scenario: User's mailbox was quarantined and couldn't access email via outlook, mobile device or OWA. User's mailbox was repaired using this powershell command:

New-MailboxRepairRequest -mailbox testmbox -corruptiontype Aggregatecounts,searchfolder,provisionedfolder,folder
view

To check to see if the repair request has completed, 
  1. Navigate to the Application Log in the Event Viewer:
  2. Filter the Log by:
      a. Event Sources:  MSExchangeIS Mailbox Store
      b. Include these Event IDs for the Repair Request: 10044,10045,01146,10047,10048,10049,10050,10051,10059,10062.

In Exchange 2010, the quarantined mailbox should have been released automatically after 6 hours. However, it was still quarantined after 15 hours.



Resolution: 

After verifying the mailbox repair completed successfully, perform the following:

1. Delete the quarantined mailbox GUID from the registry on the server:  HKLM\SYSTEM\CURRENTCONTROLSET\SERVICES\MSEXCHANGEIS\<SERVERNAME>\PRIVATE-(DB GUID)\QUARANTINEDMAILBOXES\(MAILBOX GUID)

2. Dismount and Re-mount the database. 

The mailbox was now released from Quarantine