I think PCs are going to continue to shift in form factor. The real question is: What's a PC?

When you're running a company, you have employees - lots of them - that can interrupt your schedule. You have customers that can interrupt your schedule. You have a certain obligation to wave the flag because people expect to get out and wave the flag. The number of ways that others can command your time is high. At this stage, I get to pick and choose a little more. Not that there aren't some things that have to be done, but I get a little more control over my time.

The lifeblood of our business is that R&D spend. There's nothing that flows through a pipe or down a wire or anything else. We have to continuously create new innovation that lets people do something they didn't think they could do the day before.

Our people, our shareholders, me, Bill Gates, we expect to change the world in every way, to succeed wildly at everything we touch, to have the broadest impact of any company in the world.

Look at the product pipeline, look at the fantastic financial results we've had for the last five years. You only get that kind of performance on the innovation side, on the financial side, if you're really listening and reacting to the best ideas of the people we have.

Developers, developers, developers...

I meet with Satya [Nadella] what probably amounts to four or five times a year - either to brainstorm something or just as a shareholder, we'll sit down and chat. That's always quite helpful for me and hopefully him in terms of thinking things through. I still have a number of friends and colleagues who occasionally want to brainstorm or chat about something, and that's always fun.