If you go by the ratings of the OST converterthen the OST converter is always at the top position is
InQuit OST to PST Converter. The users of this tool are spread across the world. This tool can support the various formatslike PST, EML, MSG, vCard, vCal, EMLX, MBOX, and HTML. With the help of this
tool you can also export the data to cloud based applications like Office 365
and Live Exchange Server. You can recover the emails with inbox, outbox,
sent-items, deleted-items, drafts, contacts, calendars, notes (to, cc, bcc,
subject, date and time). Always try the free demo version of the tool before
you purchase it, so that you can make good decision based on your experiences.
Read More: https://www.inquitsoftware.com/en/ost-to-pst-converter.html