You can effortlessly transfer OST files to Yahoo Mail by using the SysInfo OST to PST Converter Tool. It allows you to migrate all your emails, contacts, calendars, and tasks from an OST file straight into your Yahoo Mail account. It preserves the original folder hierarchy and ensures no data is lost during the process. Additionally, you don’t need to have Outlook installed to access your OST files in Yahoo Mail with this solution.
Read more: https://www.sysinfotools.com/ost-to-pst-converter.php