Bill Gates wrote:

Looking further out into the future, we have the idea of a really ultra-mobile device. And this is going to require a lot of innovation by all the different kinds of components. The idea is, we'd have something that looks like this, ultra-thin, we are working at the chip level, and the display level to make sure that a device like this can be done for something well under $1,000, hopefully even in the $800 range. We call this our Ultra Mobile 2007. There's a lot we need to do in the software to make this something that's very easy to work with, and probably having a touch screen. We want to get down below two pounds, as close to one pound as we can, get an all-day battery life in this thing. We do believe this is achievable, and we're certainly doing our part of the work, and then working with others as well. This will be a camera, this will be a phone, this will be a thing where you have the touch screen and the ink, you'll be able to watch, listen to your music, of course, watch motion video, and so as we get this under $1,000 as a companion device, we think that will be popular.