Source -Intel has thoroughly tested Windows 7 and has given it the green light for its own use. The company will begin replacing Windows XP on its machines next year.
Intel recently posted the results of a study titled "The Value of PC Refresh with Microsoft Windows 7" in which it describes its experience while testing Windows 7 during the second quarter of 2009 for its own use within the company. As one would expect, Vista's successor received much praise. 291 Intel users out of 300 said they found that Windows 7 showed improvement performance and stability over Windows XP.
97 percent of Intel testers recommend Windows 7 - Ars Technica