Try the SysInfo OST to PST Converter to import OST files to Office 365, Gmail, Yahoo Mail, Thunderbird, and other email clients in bulk at once. It has the ability to export OST files to numerous kinds of file formats like PST, PDF, EML, MSG, MBOX, and so on with all email attachments like notes, tasks, calendars, journals, etc. Similarly, the users can use this tool on all Windows OS versions, including Windows 11. It provides the option to preview OST files in depth before beginning the OST conversion process. As well, it has the function to remove duplicate OST files based on distinct criteria throughout the process.