The best third-party software is eSoftTools OST to PST Converter. This is software that is error-free and has been thoroughly tested. Users can use this software to convert Outlook OST files to PST and other formats such as HTML, MBOX, EML, EMLX, Yahoo, Gmail, ICS, CSV, MSG, and vCard, among others. This software is capable of dividing huge PST files into smaller formats. With the help of this software, you can complete the conversion procedure in just a few simple steps. It provides excellent client support and an easy-to-use UI. Try the demo pack from eSoftTools' official website.
Read More:- https://www.esofttools.com/ost-to-pst-converter.html