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windows Xp Risk: In less than a month, Microsoft will stop supporting Windows XP , still the second most widely used PC operating system in the world. The company announced the OS's April 8 termination date years ago, but with as many as 500 million XP systems still active last month, not everyone is going to make a move in time. XP users have vocally protested Microsoft's abandonment of such a popular product. Objections include upgrade costs, application compatibility concerns, and whether customers should be effectively forced to leave a product that they are happy with. Despite Microsoft's increased efforts, which now include daily pop-up notifications on XP systems, almost one in three computers still ran the 12-year-old OS in February, according to web-tracking firm Net Applications. More alarming for Microsoft, Windows XP's market share hasn't decreased since last year and Windows 8.1's has barely grown. Both trends imply the company's