You can easily convert OST to PST-free files through the help of eSoftTools OST to PST Converter software. It tool can support all versions of MS Outlook. This tool can export OST to PST, MSG, EML, EMLX, Gmail, Yahoo, Zimbra, HTML, and Office 365. This product gives you free addition of the software that can freely export 25 emails from every folder of Outlook OST.
Read more:- Convert OST to PST files