CNET had an interview with Microsoft CEO Steve Ballmer at CES 2009, you can read it over here. Here's a small snip:
Q: One of the biggest parts of the PC business that's really taken off amid an, obviously, challenging time overall is the Netbook segment. What has that meant for Microsoft both in terms of the technology, but also from a business standpoint? How does that impact you?
Ballmer: Well, we've done very well on Netbooks. When they first came out, I'm not sure if people knew whether they were PCs or something else, and I think everybody kind of understands now that a Netbook is a small-form-factor, low-cost personal computer. And we're doing very well with Windows XP, which fits. Vista does not fit, and we're working hard to make sure Windows 7 fits very well on the Netbooks.
You know, from a business perspective, low-cost machine means a little less revenue per unit to Microsoft, but I think it gives us an opportunity to see expansion of the overall PC market.