If you have any confusion regarding OST to PST conversion as like How to convert OST file into PST format there is no need of this confusion because I found a blog post that provides easy manual steps for OST to PST conversion and effectively transfer all OST file mailbox data without causing any interruption. This blog really useful and I also suggest you go with this post:- http://migrateemails.com/2016/01/23/convert-ost-to-pst-format/