I'm pretty much enjoying it at the moment.
It doesn't agree with Hotmail accounts, but that's no biggie to me.
After all, I try not to use the one Hotmail account I do have.
Thing I like about Thunderbird is the fact that you don't have to sign in all the time to get your mail.
I've loaded a HUGE Address book into the thing and it never even batted an eyelid, where as OE crashed once I got up to 50 contacts.
I like this open stuff, I think this is where we are heading.
And if we are, I say, all power to it too!.
There should be no need to settle for rubbish anymore.