You can use the SysInspire OST to PST Converter Software, which is a third-party tool, to convert OST to PST files. It is one of the most up-to-date OST to PST Converter Tools for converting emails, contacts, calendar events, journals, and other attachments from Outlook OST files into PST file format. All users can get a free demo pack from the tool, which converts the first 25 items from each OST folder to PST.
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if you search any ost to pst converter software and not find any ost to pst converter software try stella ost to pst converter software to convert all ost mailbox items in to pst file this software is convert all 32bit and 64bit ost file this software is convert all ost mailbox items using some simple steps. This software is convert all corrupted and unmounted ost mailbox items in to pst file. for more info visit this link https://www.stelladatarecovery.com/ost-to-pst-converter.html