Windows Phone launch does little to move Microsoft's market share

New figures from research firm comScore show Microsoft's (NASDAQ:MSFT) share of the U.S. smartphone market continued to decline after the company's launch of its Windows Phone operating system in November. According to comScore, Microsoft's share of the smartphone market declined from 9.7 percent in October to 8.4 percent in December. (ComScore's numbers include both Windows Phone and Windows Mobile devices.) Microsoft launched Windows Phone--a complete redesign of its previous Windows Mobile operating system--in November with $200 smartphones from the likes of Samsung and HTC. ComScore counted around 5.3 million owners of Windows Phone and Windows Mobile devices in February. Special report