If in your OST file is showing an error so it’s a not big headache you can install
PassFixer OST to PST Converter tool and use it. This software is very easy to use and its easily fix your all OST file problem. And in this tool, users can easily convert their OST file into PST and many different formats like EML, MBOX, EMLX, Yahoo, Gmail, Office 365, MSG, HTML, ICS, vCard, and Zimbra. Check the demo version of this tool from the official website of PassFixer.
Read more- Free OST to PST Converter