From Will Arnett and Gwen Stefani to Jessica Alba and Jay-Z, Microsoft has corralled lots of celebs to extol the virtues of Windows Phone, but I don't see these endorsements moving the needle. If anything, the Windows 8 backlash could be spilling into the mobile space, which is a shame since Microsoft's mobile OS doesn't suffer from the same confusing two-faced interface. Plus, the best Windows Phone, the Lumia 920, is currently only available from a single carrier. No wonder Microsoft's market share is stuck at 2.6 percent.

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