Outlook 2003 did create the idea of search folders and the whole Longhorn philosophy. You can see it at work in search folders, where instead of having to drop things into individual folders, and things exist only in one folder, you create these search folders and you have the criteria for the search folder.

SPAM is taking e-mail, which is a wonderful tool, and exploiting the idea that it's very inexpensive to send mail.

The challenge here is to design a system where market incentives, including profits and recognition, drive those principles to do more for the poor. I like to call this idea creative capitalism, an approach where governments, businesses, and nonprofits work together to stretch the reach of market forces so that more people can make a profit, or gain recognition, doing work that eases the world's inequities.

Harnessing steam power required many innovations, as William Rosen chronicles in the book 'The Most Powerful Idea in the World.'

The Chinese are clearly inculcating the idea that science is exciting and important, and that's why they, as a whole-they're graduating four times as many engineers as we are, and that's just happened over the last 20 years.

I like the idea of putting your Christmas wish list up and letting people share it.

Software innovation, like almost every other kind of innovation, requires the ability to collaborate and share ideas with other people, and to sit down and talk with customers and get their feedback and understand their needs.

Antitrust is the way that the government promotes markets when there are market failures. It has nothing to do with the idea of free information.

It is hard to sell Congress and the American people on foreign aid. Is it harder to do that than it is to sell billionaires on the idea that they should give all their money away.