KTools OST To PST Converter is a program which enables you to convert any OST database file into a PST, EML or MSG format. This free version of the conversion tool allows you to see a preview of the file output, although it doesn't allow you to completely convert the file. For that, you need a program license, which is available on the author’s website.
As expected, KTools OST To PST Converter is compatible with almost any Outlook version: from the most current 2016 or 2015 versions, to the 2000, 1998 or earlier versions. You can take any OST file and convert it to PST in a matter of second whilst still conserving the original e-mail's metadata.