stella ost to pst converter software is the best software to convert all ost file data this software is convert all corrupted and unmounted ost mailbox items in to pst file this software is convert all version 32bit and 64bit ost file this software is convert all ost file data like emails, contacts, calendars, task, notes and many other items in to pst file this software is convert all ost file data using some simple clicks. For more info visit this link https://www.stelladatarecovery.com/email-migration/ost-to-office-365.php