Found a good plugin for Thunderbird that allows POP access to your Hotmail on Thunderbird. I think it’s basically some sort of "screen scraper" which makes HTTP requests and pulls back the emails from there. It stopped working recently as Live was updated but has recently been updated again so now works.
It’s called WebMail (Homepage) and is an extensible framework that allows downloading of Hotmail, Yahoo, Gmail (although that works natively now anyway) and various other webmail sites direct into Thunderbird. It’s also easy to set up – thoroughly recommended.