OST to PST Converter
with the help of eSoftTools OST to PST Converter software. This helps to recover corrupt or damaged OST items such as emails, notes, contacts, journals, drafts, tasks, calendars, attachments, etc. It can also export OST to multiple file formats such as PST, EML, MSG, MBOX, EMLX, vCard, and others. It is compatible with all Outlook versions, including 2003, 2008, 2010, 2013, 2016, and the most recent 2019. It is also compatible with Windows operating systems, including Windows 7, Windows 8, Windows 8.1, and Windows 10 (32bit & 64bit). Examine the free demo variant of the software to convert a few emails from each ost to pst or other required file formats for free.
Read more:- https://www.esofttools.com/ost-to-pst-converter.html

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Kiran Sharma commented
You can go with a reliable and secure MacSonik OST to PST converter for Mac to convert OST to PST file format efficiently. This utility helps in the bulk conversion of OST files with or without attachments. Users can opt to convert selective emails of the desired date using the Mail Filter option. The OST to PST converter allows users to split the resultant PST files if it large in size. Apart from this, it also removes duplicate emails from the process without losing data integrity.
To know more:- https://www.macsonik.com/ost-pst-converter/
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Somit Vishwakarma commented
OST to PST Converter: https://www.sysbud.com/ost-to-pst.html
Recover corrupted, damaged and inaccessible OST file in PST.