I tried Eudora, and uninstalled within fifteen minutes. It wouldn't import from Netscape 4.7, and crashed, and I stupidly made it default and couldn't figure out how to make it undefault.

I then installed Netscape 7.0, and things went a lot smoother. I changed to the classic theme, which just feels better, and there are things I need to get used to, but it's tabbed like Opera, which I like. So, I'm staying with 7.0 right now.