WebMail
A friend of mine who goes by the name easy_way told me about a cool universal Thunderbird plugin called WebMail. With this plugin you can send and receive email from AOL, Yahoo, MSN, GMail, and a few others. The cool thing about it is that you can do it all from your Thunderbird window instead of going to the web pages and doing it. You can download it and read more info about it at the website. Hope you enjoy!