Ubuntu must be giving Microsoft fits on the desktop. That's the only reason I can come up with for Microsoft's LinkedIn search for a new director of open-source strategy, with a focus on the desktop:
The Windows Competitive Strategy team is looking for a strong team member to lead Microsoft's global desktop competitive strategy as it relates to open source competitors.
Given Red Hat's relative inaction on the desktop, this position likely will focus on Novell and Canonical's Ubuntu, but of these two, only Ubuntu's desktop is really catching the imagination of the market.