What I see in this thread is A LOT of people complaining about a free product, but I wonder how many of them have actually donated money to help with the development? I just donated $100 myself because of the current donation campaign, but I'm happy with what I get largely for free.
There's no way I would donate to Thunderbird in its present state. Why should I want to give money to people doing things I don't like? That's like paying money to Google!