I would like to suggest you to take help of Recoveryfix for OST to PST Converter tool to easily convert OST file to PST format. It also migrates OST files to Office 365, Outlook.com, Gmail, Live Exchange, and other IMAP servers.
Supported Versions:
**MS Exchange Server -** 2019, 2016, 2013, and earlier versions
**MS Outlook -** Office 365, 2021, 2019, 2016, and previous versions
**Outlook Express -** 6.0, 5.5, 5.0 and 4.0
**Windows OS -** Windows 365, 11, 10, 8.1, and older versions