Try STELLA OST to PST converter software convert all the ost file data in to pst file. stella ost to pst converter software support all the version of the exchange ost file. stella ost to pst converter software convert all the ost items in to office 365 account. Ost to pst converter software convert all the ost items in to eml file, msg file, mbox file, mhtml file. demo version of the software convert 25 emails in each folder.
For more info visit this link
https://www.stelladatarecovery.com/ost-to-pst-recovery.html