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.

This is a great opportunity for Don, and I wish him success. I am incredibly proud of the work and vision culminating in Xbox One. I'm particularly excited about how Xbox pushes forward our devices and services transformation by bringing together the best of Microsoft.

From a client perspective, I really think the work Microsoft's doing with Surface, with HoloLens, with Xbox, that stuff's absolutely essential to the company's future. Because innovation in the future will either be from the cloud out to all devices, or from devices as supported by software in the cloud. I think it's important for Microsoft to participate both ways.

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.

At Microsoft I had many years of experience and history and seeing connections. With my direct reports, the job at Microsoft was to delegate and then be able to properly review, but not to micromanage. To have a way of connecting and integrating without getting in the way.

The stock market has always had its own meter. Sometimes it's ahead of itself, sometimes it's behind itself. A broken watch is right twice a day.

Developers, developers, developers...