From a current NYTimes article by Nick Wingfield about Microsoft:
The [Microsoft] executives were stunned by how deeply Apple was willing to reach into the global supply chain to secure innovative materials for the iPad...I read that as, "Microsoft executives don't give a damn about quality or innovation." However, neither quality nor innovation have ever been Microsoft hallmarks. Zune?
And, later in the article:
In a nod to Apple’s work with aluminum, Microsoft began to closely study materials that could be used to create a distinctive case for a tablet. Members of the Windows team gravitated toward magnesium...Except of course, Steve Jobs knew about magnesium. I owned a Jobsian computer made of magnesium for some time: a NeXT cube.