OST to PST Converter is a truely Secure and a professional Solution for users to convert OST files into PST. It has simple GUI which offers direct conversion of OST files into PST format along with all mailbox folders including inbox, draft, sent items, trash, custom folders, etc. It is easy to use utility with supportable to all new and old versions of MS Outlook and Windows OS.

https://www.zooksoftware.com/ost-to-pst/