The best tool that converts OST files into many formats- PST, HTML, RTF, MSG, etc is MailsDaddy OST to PST converter. It quickly scans and repairs the damages and also converts orphaned OST files. It supports 2019, 2016, 2013, 2010, and 2007. Generates a preview of emails and exports the complete OST data. This tool is compatible with Windows 11, 10, 8, 7 and Win XP, etc.