I loved every minute of my time at Microsoft, but I had always envisioned having another phase of life just because I thought that would be interesting. It had never been my plan to work until I literally didn't want to do anything and then hang it up.

We've grown from 18% of the profits of the top 25 companies in our industry to 23% of the profits of the top 25 companies in our industry over the last five years. Profits are up over 70%, where the industry profit is up about 35%. Pretty good.

So, I think the output of our innovation is great. We have a culture of self-improvement. I know we can continue to improve. There is no issue. But at the same time, our absolute level of output is fantastic.

I loved every minute of my time at Microsoft, but I had always envisioned having another phase of life just because I thought that would be interesting. It had never been my plan to work until I literally didn't want to do anything and then hang it up.

I have lots of sources of information about what's going on at the company. I think I have a pretty good pulse on where we are and what people are thinking.

Everyone likes to differentiate between business and consumers but I don't see the difference really. Most people are people. I get personal and business mail and I have one set of contacts from my life. I don't want to manage two sets. I want one view of my world.

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.