The Inventor of Email Uses...Thunderbird

Of course:

He uses Thunderbird, an e-mail application developed by Mozilla, the company which distributes the Firefox web browser, but he also has a Gmail account.

He said he once had to use Outlook – “I didn’t find it particularly attractive”, and that for a time he blocked all incoming messages from Hotmail, “because they used to carry a lot of viruses – though they’ve clamped down on that.”

(Via David Ascher.)