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Full user review
"The best e-mail client!"
New Tag feature allows you to color code each of your e-mails in order of importance (Important, Word, To Do, Personal, Later). A much more attractive interface, with all new buttons (especially noticeable on the RSS Feeds). Thunderbird 2.0 seems faster to me than 1.5...but it could be just me.
Compared to Outlook Express, finding things in the options menu (adjusting your font, starting your reply above or below a quote, etc...) are still a bit hard to find. But you only have to do it once if you're installing a fresh copy of Thunderbird on your PC.