Trying to import OST files into Yahoo Mail? If yes, then Yahoo Mail didn't import Outlook Data file directly? If you want safe approach to complete the OST-to-Yahoo Mail migration process, then download RecoveryTools OST to Yahoo Mail Migrator Tool. This application directly imports OST mailbox items such as emails, attachments, tasks, notes, etc., to Yahoo Mail account. No need to worry about folder structure when you import OST file to Yahoo Mail with this tool. It maintains folder structure during import process. Download free demo edition of this application to learn more about the software.