Help with Thunderbird?

[AlphaDog]

I suppose we can't rule out the ISP completely, but it's been doing other strange things, too - like locking up when I move files between folders. At one point, I did do a "Compact Sent Folder" command, and it took five minutes before the app would respond to any other command, and that included loading a list of messages in the in box. That's why I was feeling it was something with T-Bird itself and not the ISP.