Ballmer's take on Vista's market impact

Microsoft's CEO Steve Ballmer describes the soon-to-be-released Vista operating system as his company's biggest technology project to date. While he won't even guess how much has been spent on development, he says the key to success is innovation that includes managing the amount of integration and incubation risk.

For more on Ballmer's take on Vista's impact:
- check out this Q&A at Mercury News