[news=http://img136.imageshack.us/img136/2404/untitled10ir.gif]Thunderbird 3 will offer additional user interface enhancements and many substantial platform improvements. It will be based on Gecko 1.9 (the current Mozilla trunk). We are currently brainstorming about various user interface improvements to take advantage of the advanced graphic rendering work being done for Gecko 1.9. Most Thunderbird 2 feature work lands on the trunk first and then onto the 1.8 branch.
Download Link: Currently Only For Windows