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Microsoft.Mapi.MapiExceptionMailboxQuarantined while Logon into the Mailbox

While user trying to logon to his mailbox, user got an error that

Exception Exception type: Microsoft.Exchange.Data.Storage.StorageTransientException

When I tried to move the mailbox to another data base


The issue here is, Exception type: Microsoft.Mapi.MapiExceptionMailboxQuarantined

To resolve the issue,

Run get-mailbox -identity <Mailbox> |fl

take the below details from the above command,

a. Database

b. MailboxGuid

c. ServerName

Run Get-maildatabase -identity <DatabaseName> |fl

take the below details from the above command,

d. Mailbase Database Guid.

Well, You got the required details now, post that Login to the Server from where the database is hosting right now

Open regedit, and go to the path,


Move to the “QuarantinedMailboxes” registry key:

Find the relevant MailboxGuid  and delete it.

On the Exchange server, restart the service “Microsoft Exchange Information Store”.


WOOT, now you can try to login into the mailbox without any issues.

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