Cannot access disconnected and then reconnected mailboxes Exchange 2010

I have some disconnected mailboxes in Exchange 2010 server, and I want to export them to a .pst file. I reconnected this mailboxes, and tried to export using New-MailboxExportRequest, and it worked fine with some of the mailboxes, but failed in some of them. I tried to access with Outlook the mailboxes that failed to export, and was imposible.

Before exporting the mailboxes I executed a Clean-MailboxDatabase, to ensure all is updated. I tried to wait to days from the reconnection of mailboxes and the exportation failed too.

Any answer would be apreciated.

Thanks,

Victor Camacho