Hacker News Reader

I've yet to see a usable alternative to Thunderbird on the desktop. (I also don't care about OSX-only products.)

What's wrong with Thunderbird, though?

It is a chore to make the view consistent across folders, I never seem to find the option I'm looking for, and the UI is generally very outdated.

Too bad it's merely a second-class citizen at Mozilla (though I completely understand the reasons.)

I'd like to see better search functionality. It seems I can never find any relevant emails when searching in Thunderbird.