Thunderbird 1.5 is out, and so far I am very pleased with the free email application. The realtime spellchecker is done quite well. It is unobtrusive but highly usable. The junkmail controls are helpful and allow me to integrate with SpamAssasin, which runs on my web/email server. This version has the improved Updater that Firefox 1.5 got, and it installed without a hitch. Cool!