If you have the need to the conversion of OST to PST file format then, I would always recommend using the best OST to PST Converter like OST Converter, OST to PST Wizard, etc. Because of OST to PST Converter can safely migrate all OST data to PST file and maintains the data integrity of OST file after the conversion.
1- batch conversion.option
2- split option.
3- messages filters option.
4- no file size limitation.
more info- convert ost to pst outlook
This is a master solution for this OST to PST converter software . This is the most recommended software for converting OST to PST Outlook file format with email properties like To, Subject, Date, Bcc, Cc, etc. This smart application is quickly available. Transfer OST data to Outlook PST format without data loss. This program is a cool utility and it is compatible with all versions of the Windows operating system. https://www.pcinfotools.com/ost-to-pst-converter/