In 2003, Mozilla foundation launched an open-source, and cross-platform email client. This program helps in arranging all the emails and email addresses conveniently. The features like address book, activity manager, message searching make it the best platform. The default settings og=f Yahoo doesn’t allow any non-Yahoo applications to access the email you will have to disable this restriction to proceed further. Once you have disabled the restriction you will able to set up your Thunderbird with Yahoo.