A quick tool to recover, repair & convert OST to PST file is MailVita Converter for OST. It is a Windows based software and works well on its al versions. It will help to recover damaged OST files and convert them into PST format to access the emails again in Outlook by importing the PST files. This tool is very simple to operate and manage the OST files through it. Refer: https://www.mailvita.com/converter-for-ost/