Stella ost to pst conversion software is the powerful software to convert all ost mailbox items in to pst file. this software converts all ost mailbox items like emails items, contacts items, calendar items and many other items in to pst file. this software converts all ost items into office 365 accounts and converts all unmounted and corrupted ost mailbox items in to pst file.
For more info visit this link.
https://www.stelladatarecovery.com/email-migration/ost-mails-converter-software.php