Try stella ost to pst converter software to convert all the ost file data in to pst file. stella ost to pst converter software convert corrupted ost file data in to pst file. stella ost to pst converter software convert all the ost mailbox items in to office 365 account. Stella ost to pst converter software convert all the ost file deleted items in to pst file. stella ost to pst converter software convert 32bit and 64bit ost file data in to pst file. for more info visit this link https://www.stelladatarecovery.com/email-migration/ost-to-office-365.php