And I was pleasantly surprised to find that it's better than I remember, and worked great for the 20,000 messages or so in each of their AOL In boxes. Sadly, I'm not kidding about those In boxes.
For my accounts I rely on Apple Mail and SpamSieve, which works well. The dealbreaker for me when I tried Thunderbird years ago is that it lacked any way to export the filters you'd set up, so you could copy them to your other computers. Has this been addressed?