Most of the IT Professionals recommend to use InQuit
OST to PST Converter for the best outcomes. This tool is one of the most reliable tool to do the conversion. this software is very easy to use as the graphical user interface of this software is self-explanatory. This tool scans the files perfectly and then converts the files. . This tool can convert file into various formats like EML, MSG, vCard, vCal, EMLX, MBOX, and HTML. This tool can also support the cloud based applications like Office 365 and Live Exchange Server. It support MS Outlook version 97, 98, 2000, 2002, 2003, 2007, 2010, 2013, 2016 up to 2019. Use InQuit OST to PST Converter to recovery emails, inbox, outbox, sent-items, deleted-items, drafts, contacts, calendars, notes (to, cc, bcc, subject, date and time). You can convert single as well as multiple files at a times. You can avail the free demo version of this software.
Read more Info: https://www.inquitsoftware.com/en/ost-to-pst-converter.html