If you are having trouble in the conversion of OST file to PST format. You can use OST to PST Converter that will work without any issues for you. The tool assures you no loss of any data file and no compromise with file quality. The application works effectively with all editions of MS Outlook including Outlook 2003, 2007, 2010, 2013, 2016, 2019, etc.
More info:- https://www.dailysoft.org/ost-to-pst.html