If you are searching a safe and free OST to PST Converter tool then you can use OST to PST migration Software that supports the OST to PST file convert them into a different file format such as PST, EML, Zimbra, Gmail, Office 365, Live Exchange Server, EMLX, MBOX, MSG, vCal, vCard, HTML, NSF, PDF, and etc. file types.
more info- Convert OST to PST Outlook
Get this perfect solution of OST to PST file exporter that helps you to repair Offline OST file data mailbox and convert OST file to PST file instantly. Program can directly export OST to PST, Office 365, Zimbra, MBOX, EML, EMLX, MSG, VCF, ICS & HTML File.
More Info :- https://www.jsltools.com/ost-to-pst-converter.html