MailsDaddy OST to PST Converter is best Outlook backup tool to import OST to PST format. With using it, users can save Outlook emails in other format also like MSG, RTF, EML, HTML, MBOX, etc. The application can fix all undefined error during OST to PST conversion. Users can split large OST file email database into small PSTs file. It generate details preview on computer screen to read and analyze email items. A free OST Converter is also available for users to test the features that convert the first 20 from each folder.