If you look at companies with upside potential, Twitter's right there. They've established a brand in a world where it's extremely difficult to establish a brand. It's a global brand, people recognize it, people want to let you know what their Twitter handles are, etc.

It actually turns out to be much harder to really understand government across state local and federal.

The most common format of music on an iPod is 'stolen.'

We're very focused in on outcomes for government with respect to the amount of tax that goes in and the amount of expenditures that go out.

The company [Microsoft] really has to chart a direction in mobile devices. Because if you're going to be mobile-first, cloud-first you really do need to have a sense of what you're doing in mobile devices. I had put the company on a path. The board as I was leaving took the company on a path by buying Nokia, they kind of went ahead with that after I told them I was going to go. The company, between me and the board, had taken that sort of view. Satya, he's certainly changed that. He needs to have a clear path forward. But I'm sure he'll get there.

Any idea that turns out to be truly great can be harvested for tens of years. On the other hand, if you want to continue to be great, you've got to bet on new things, big, bold bets.

I would love to see all open-source innovation happen on top of Windows.