More statistical curiosa: What email application/service do you use?

Out of curiosity, what is your favourite email application or service, or which is the one you actually use? Email is (or used to be) a very important part of anyones daily life, so it would be interesting to know.

Personally, I am a Mozilla Thunderbird convert. I've been using it since v1, but only recently did I make the full switch and it coincided with the appearance of Windows Live Mail. I was a die hard Outlook Express (OE) user, but somehow I don't think the boys from Redmond have created anything special with Live Mail. It's kind of a hybrid of OE and the cloggy Outlook, and probably it has snapped up a few features from the most popular apps on the market as well (nothing wrong with that really). So, I dumped MS alltogether and started using Thunderbird exclusively.

I've never been much of a webmail user.

I remember in my old apple powerbook days using Eudora, but the application I preferred back then was a program that I no longer remember the name of...