I will suggest you use OST to PST converter tool to convert OST files to PST files. It is a great application that Shift many OST data to PST files format. This software works effectively with all editions of MS Outlook including Outlook 2003, 2007, 2010, 2013, etc

I would like to suggest you OST to PST Converter software is a newly updated software that exports OST file to PST file along with notes, contact, attachment, task, draft, etc. This software is user-friendly. You don't need to learn any technical knowledge. Anyone users can use this application.