Downloaded and installed Thunderbird today, and configured it for two of my 5 email addresses.
I’m a little put out with OS X’s Mail … it’s a beautiful but sometimes too ditzy blond.
My main problem right now is that Mail’s autocompletion of email addresses that you start typing seems buggy: Mail will lock up and give me the dreaded spinning beach ball every fourth or fifth address. I send a TON of mail, but this is crazy.
Not sure if I’m going to stick with Thunderbird as my main emailer … this is stricly a trial balloon.