It has become the PowerPoint slide seen around the world — or at least the World Wide Web, and specifically those websites and blogs that pay close attention to technology and the smartphone market. A Microsoft presentation at the ReMIX trade show in France this week boasted a slide showing that tech market research firm IDC predicts 30 million Windows Phone 7 devices sold worldwide by the end of 2011. Considering it took Apple nearly three years to sell 50 million iPhones, Redmond seemed to be setting its own bar at Olympic-style heights.