Jay LaCroix hosted this recent interview on his "Learnlinux TV" youtube chanel:
Thunderbird is NOT Dead! (Interview with Alex and Jason from Thunderbird)
It is always good to hear that a project is doing well. 
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I didn't realise anyone was claiming TB was dead in the first place - though that's never a good sign when it isn't even true to start with. I'll watch the video before going any further, but given the terms in use it seems death would probably have been preferable.