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

It's hard to improve public education - that's clear.

It was really phenomenal [Warren Buffett donation]. It grew out of the friendship that we had and the fact that his plan to have his wife run the foundation and give things away changed when she tragically died.

Kenya’s M-Pesa proves that when people are empowered, they will use digital tech to innovate on their own behalf.

Well, it's taken time to get this going, but he was right. If you give people a chance to associate themselves with a cause they care about, while buying a great product, they will. That was how the RED Campaign was born, here in Davos.

With tech companies, whoever's the leader is always questioned, you know. They say, 'Is this the end of them?' And - there's more - more times people think that's the case than it really is the case.

Part of the magic of economic growth is how you educate people, and the leading economies have to stay in front of that. From an economic point of view, it affects competitiveness and creates jobs. Or from a social justice point of view, you can take someone in the bottom tier of income and let him compete to be a doctor or lawyer. The education system is the only reason the dream of equal opportunity has a chance of being delivered - and we're not running a good education system.