Tonight Thunderbird 3b4 spontaneously informed me:
Awww…shucks, thanks guys for looking out.
I’ve been using Thunderbird 3 beta since August. It’s fantastic. Use it. Also, be sure to follow @davidascher and provide him with cheerleading.
Follow @Shaver too while you’re at it. He has a post about this security problem at his blog.
Aaron Fulkerson 
hmmm..