if you find a .ost file converter software to convert all ost file data in to pst file and you not find any best ost file converter software just try stella ost to pst converter software to convert all ost mailbox items in to pst file this software is capable to convert all .ost mailbox items like emails items, contacts items, calendars items and many other items in to office 365 account this software is support all version 32bit and 64bit ost file this software is convert large ost file mailbox items in to pst file for more info visit this link https://www.stelladatarecovery.com/ost-to-pst-recovery.html