Mozilla is Wrong. There is Still Room for Open Source Thunderbird InnovationJul 10, 2012, 07:00 (0 Talkback[s])
(Other stories by Sean Michael Kerner)
While Firefox has achieved stunning success over the years and generated hundreds of millions of dollars for Mozilla - Thunderbird has not.
Thunderbird has been slower to release in my experience and the project lacks the vision and the leadership that Firefox has enjoyed for a decade. Mozilla is now (once again) pulling back from Thunderbird