If you are planning to convert your Outlook OST file into PST format, then I suggest taking the help of
MacSonik OST to PST Converter. Using this software, users can export multiple OST files into PST format without any data loss. With this tool, users can convert OST files into PST, EML, MBOX, Office 365, etc. It also displays the preview of the complete OST file database before conversion. Apart from this, it has a feature of selective emails by which users can easily transfer some selected OST files into PST format.