Do you want to convert the OST file to PST format. I consider the best solution is SysInspire OST to PST Converter tool. It can migrate all damaged OST files into PST, and another 10+ formats.also it can Recover data from Outlook OST file, This tool supports all MS Outlook versions- 2003, 2007, 2000, 2010, 2013, 2016. This tool converts the OST file into PST format without the presence of this Outlook. You will use this tool without the installation of Exchange Server or MS Outlook. That can extract the whole archive of OST files and preserve all data structure or formatting.