I would like to suggest the OST to PST Converter tool. This is one of the advanced tool that easily repair and convert OST to PST file formats in just few clicks. you can also save your OST file into many other file formats like: EML, MSG, MBOX, HTML, ICS, VCARD etc. The program is proficient enough to export all the properties like To, Cc, Bcc, Date, subjects, and email headers in new file. Even a non-technical user can handle this program easily.
to export the OST mailboxes to PST, follow the simple procedure:
I hope this helps