Free OST to PST Converter Tool: Demo version is available free of cost so you can easily examine the Utility before purchasing. Free OST to PST Converter Tool allows you to Recover OST Files to PST as firstly the software read OST files and then shows all OST mail items that are to be converted to PST. Support all the versions of MS Outlook like2016, 2013, 2010, 2007, 2003 etc and runs on all windows OS Win10, Win8, Win7, XP, Vista, Server etc.