Adaptive junk mail controls - Thunderbird's junk mail controls learn and improve from emails that you receive to stop spam.
Integrated RSS news and blog reader - View RSS news feeds and blogs with Thunderbird to quickly scan and sort through hundreds of headlines.
Saved search folders and search bar - To help you find emails faster you can save common searches in virtual folders and find emails with the search bar.
Tools to efficiently manage email - Global inbox, message filters, grouping, message views, labels, and much more are available to help you manage your email.
Extensible with themes and Add-ons - Extensions like Palm Synchronization with address book make Thunderbird even more customizable and convenient to use.
Easy migration - With Thunderbird it's easy to switch from Outlook Express and other email clients. When you first launch the product, Thunderbird migrates your mail account from Outlook, Outlook Express, Eudora, and Netscape Communicator.