I use Eudora. The one problem I have with it - occasionally, after opening and closing it a few times, and then having it open for a few hours, its CPU usage will decide to jump to 99% for a little. No idea why. I have to go to Task Manager and end the process. I use the free version of it though; can't expect more than what I'm paying I guess. And it's not like this problem happens very often.