The future of Windows is to let the computer see, listen and even learn.

We have two other countries, Pakistan and Afghanistan - again it's the instability that is a problem there. So over the next several years, we expect to drive the number of [polio] cases back down to zero because that is likely to be the second disease after smallpox that we completely eradicate.

Business isn't that complicated. I wouldn't want to put it on my business card.

Talking to mothers, always brings it home because they're so anxious to do everything they can for their kids and so tragic for them.

If we can find approaches that meet the needs of the poor in ways that generate profits for business and votes for politicians, we will have found a sustainable way to reduce inequity in the world. This task is open-ended. It can never be finished. But a conscious effort to answer this challenge will change the world.

There's no such thing as going to a soapbox and saying, 'The government's corrupt,' and not having the intelligence service see your face. In the digital world, that can be done.

I never took a day off in my twenties. Not one.