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vMail OST to PST Converter is a secure utility to retrieve lost data from orphaned OST file and import to PST format. It absolutely converts OST file, including all relevant folders like Inbox, Outbox, Sent Items, Deleted Items, Draft, Tasks, Journals, Calendars, Notes, and Contacts. Even, recovered OST data can be saved in multiple formats such as PST, EML, PDF, MSG, TEXT, RTF, and HTML.
Know more info- https://www.vsoftware.org/ost-to-pst-converter.html

You have to use QuickMigrations OST to PST Converter tool to export OST file in PST file format.

Read more: https://www.reddit.com/user/somit0/comments/udt3k4/best_ost_to_pst_converter_tool/

In offline mode, Microsoft Outlook stores all Exchange data in an offline OST file. Sometimes, OST files can get corrupted due to unexpected crashes or disasters. Thus the request for OST recovery in PST files increases. The user has to rectify this situation by converting the corrupt OST files to PST files as this is the only way to access corrupted OST file data.
Software Page: https://www.shoviv.com/ost-to-pst-converter.html
Manually, OST to PST conversion requires technically proficient users, and it is a slow and long-drawn way. Besides this, it does not manage the security of the entire data. Therefore, use a professional software solution like Shovive OST to PST Converter to convert corrupt/healthy OST files to PST file format.
Read more: https://www.shoviv.com/blog/how-to-convert-ost-to-pst-with-an-easy-way/