If you are looking for a reliable and easy tool to convert OST to PST format, I recommend the OST Exporter tool. It is the best conversion tool to export OST to PST and various other file formats like EML, EMLX, MBOX, MSG, and VCF formats. This application enables the user to move OST to PST with few clicks without any hassle or technical knowledge. This tool is compatible with all versions of Outlook like 2019, 2016, 2013, 2010, 2007, 2003, 2000, etc. Visit here for more info: https://www.betavare.com/ost/