When I was in my 40s, Microsoft was my primary activity.

Microsoft does not dominate the software industry by any stretch of the imagination. We have lots of very able competitors who keep us constantly vigilant, and sometimes they beat us to the punch. Microsoft's success to date is based solely on the fact that people like Microsoft software.

There are more people dying of malaria than any specific cancer.

People can criticize Microsoft for supporting this TV thing for the past eight years, but it is a long-term bet, There is not any other software business that is as dedicated to the vision of the TV and the PDA [personal digital assistant] as we are.

There certainly is a case to be made that taxes should be more progressive.

I do normal kind of contributions, particularly for people who are going over to Africa and help highlighting global health, and that's tended to be pretty bipartisan in nature because of the coalition there exists fortunately around these global health issues. But I don't think my backing, putting a lot of money into political contributions is a way I'm going to try and help improve the world.

Today, we're very dependent on cheap energy. We just take it for granted - all the things you have in the house, the way industry works.