If you are getting exhausted trying to find out the best software to import OST files to Yahoo Mail, then you are at the right place. I am going to tell you about the most risk-free and perfect tool that is recommended by many professionals. The software name is ConverterTools OST to PST Converter tool. This software allows you to import OST files to Yahoo Mail along with many other email clients, for example, Gmail, Office 365, Hotmail, Thunderbird, and so on, in bulk. It also assists in converting OST data to multiple kinds of file formats like PDF, EML, MSG, MBOX, etc with their attachments, for example, emails, contacts, calendars, tasks, etc. Moreover, it provides the Remove Duplicate Mail feature to skip all duplicate OST emails before migrating them into several file formats and email clients. Along with this, by using this tool, users can also maintain their folder hierarchy as per the actual files, and it strongly works on all Windows OS versions, including Windows 11.