not sure if this is possible. here is a question in the Mozilla Thunderbird FAQ...
Can I access my Netscape WebMail or Hotmail accounts through Thunderbird?
No. Netscape WebMail and Hotmail use proprietary protocols. To access WebMail directly through an e-mail client requires you to use Netscape 6+ with AIM; to do so with Hotmail requires either Microsoft Outlook or Outlook Express. Of course, you can access your WebMail account on the Web at
http://webmail.netscape.com/, or Hotmail at
http://www.hotmail.com/.
The only way to do it i guess would be to have a script that can navigate the web automatically and try to check your hotmail, but i have no idea how this would work. If anybody knows, i would love to ear about it as well.