Thunderbird is a full-featured email, RSS and newsgroup client that makes emailing safer, faster and easier than ever before. More information about Thunderbird is available.
New features include.
Adaptive Junk Mail Controls
RSS Integration
Saved Search Folders
Global Inbox Support
Message Grouping
Privacy Protection
Comprehensive Mail Migration from other Mail Clients
More information and download links go to the Thunderbird website.
http://www.mozilla.org/products/thunderbird/