In an interview to the London Times, Ray Tomlinson, described as the inventor of e-mail, explains that he uses Thunderbird.

The more substantive comment in my mind:

Does he think, given the development of other forms of electronic communication such as instant messaging and social networking, that his creation will stand the test of time?

“I suspect possibly we’ll see a morphing of e-mail and other, more instant methods,” he says, “but there will always be a need for people to be able communicate asynchronously, that is, send messages that won’t be read or replied to immediately, and that’s what e-mail allows you to do.”