"Windows 7 sold more 600 million copies in under three years. That is, on average, over 200 million additional potential customers every year. No other platform offer this."
This is wrong. Android should ship to 500 million new devices in the next 12 months alone: http://www.phonearena.com/news/500-million-Android-devices-a... If you are a developer who wants to focus on the fastest growing platform, Android is the one, not Windows 8.