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Nowadays many conversions tool also available freely, but I suggest you one of the Great & professional vMail OST to PST Exporter software. It converts OST file into PST and other file formats like PST, HTML, MBOX, EML, MSG and many more. It gives many features users split their unlimited size of the OST file format without any hassle. It supports all Windows versions up to win 10 and all Microsoft Outlook versions. A free demo version of this tool is also available few emails can easily be converted into each format.

Know more info- https://www.vsoftware.org/ost-to-pst-converter.html