Like its sibling Firefox, the beauty of the open source Thunderbird email client is its extensibility. Sure we love our web-based email like Gmail, but Thunderbird is the ultimate open source desktop email app. Its pluggable interface lets developers freely build extensions to make it ever more useful. And ever more useful do a few key extensions make it.
File messages in a flash, customize keyboard shortcuts, weed out duplicate messages automatically, supercharge the search field and more with these 8 must-have enhancements for Thunderbird.