I like free just as much as the next gal, but if you use webmail like Gmail or Hotmail, you probably have ads all over your email. And you might not like computers parsing your personal letters for marketing information, I know I don't.
On the other hand, desktop programs like Outlook are awkward to use and a bit bland. That's why I have a completely different kind of email system in place.
It's a desktop program that combines the best of both webmail and desktop email programs. And the best part is that it's completely free. Who doesn't like free?