If you want to backup all emails from Yahoo to various formats, then you can try the best Yahoo Backup Tool. It can assist you in resolving Yahoo issues and transferring them into accessible Outlook PST formats. The user converts data from the Yahoo file to the PST, EML, MHT, MSG, HTML, DOC, DOCX, etc. This software is compatible with the Windows OS versions including 10, 8.1, 8, 7, Vista, XP, etc.