Due to my busy schedule, I prefer using third-party tools to handle data conversion tasks efficiently. Recently, I’ve been using the GoldyTools OST to PST Converter to extract data from Outlook OST files and convert it into PST format. I initially purchased the software last month to recover data from a corrupted OST file, but I’ve since found it incredibly useful as a reliable and fast converter as well.

If you're looking to export Outlook contacts—or your entire mailbox—into a PST file, I’m confident this tool will make the process quick, easy, and hassle-free.

https://www.goldytools.com/blog/convert-ost-to-pst-file-format-in-simple-steps/