How to access OST file if it goes corrupted? Use Kernel OST to PST converter software that efficiently recovers data from corrupt OST files and makes it accessible by converting it into Outlook PST format. The software allows you to save the recovered data in various formats such as PST, DBX, MBOX, MSG, EML, TXT, RTF, HTML, MHTML, and PDF formats. The software supports all versions of MS Outlook including Outlook 2013.