Nokia’s handset business is officially no more, having been absorbed this past Friday by Microsoft as part of a $7.2 billion deal. Nokia’s phones will live on, however, and the burden of selling them will now fall squarely on Microsoft’s shoulders. Nokia had been the only smartphone vendor to really make any progress with Windows Phone, and most of it was with low-end devices in emerging markets. Even with Nokia’s newfound success in recent quarters, however, Windows Phone’s global market share still sits in the low single digits more than three years after the platform first launched. Of course, this is no longer Nokia’s problem. Microsoft is now on its own in its efforts to sell Nokia-built smartphones, and it recently released