I would like to suggest vMail OST to PST Converter software, it can easily solve OST file corruption issues and convert in simple steps OST file to PST format. The tool allows save converted OST data in multiple formats like EML, TXT, MSG, RTF and Office 365. Supports all versions of Windows Operating Systems such as Windows 10, 8.1, 8, 7, etc.

Know more info- https://www.vsoftware.org/ost-to-pst-converter.html