If you want to open an OST file that cannot be accessed then you can switch to the SysInspire OST to PST Converter tool. This software can auto load the OST file and detect all errors and fix it then convert your OST file in Outlook PST. if you want to convert your OST file into different email client media then this software can support 15+ different email client that is VCF, Gmail, EML, EMLX, CSV, IMAP Account, Zimbra Desktop, Office 365, HTML, Yahoo Mail, MSG and many more. This software offered a free trial in which you can convert 25 items from each of the OST file and folder.