How to Change OST File to PST File application to convert OST file to PST file on Windows Operating System. It converts any inaccessible OST file to PST file within few clicks of mouse. This software is far advanced than any other competing conversion program available in market. It works smoothly on Windows 8, 7, vista, XP and 2003 OS. This utility supports Microsoft Outlook 2000, 2003, 2007 and 2010.