Simply recover email OST file and restore OST to PST file through using OST Email Recovery application that nicely solve all problem related to recovery emails with attachments and embedded images.
Microsoft Exchange OST Conversion is designed to recover emails from MS Exchange (.ost) files that have becomes unusable due to Exchange account deletion or some other reason. In that case you used Microsoft exchange storage OST conversion.
Convert offline folder in PST file process, you can use some commercial exchange offline folder repair software. One third-party exchange OST file recovery tool to recover & repair offline OST file in few easy clicks.