From the Microsoft press release:

Available across multiple platforms, “Minecraft” is one of the most popular video games in history, with more than 100 million downloads, on PC alone, by players since its launch in 2009. “Minecraft” is one of the top PC games of all time, the most popular online game on Xbox, and the top paid app for iOS and Android in the US. The “Minecraft” community is among the most active and passionate in the industry, with more than 2 billion hours played on Xbox 360 alone in the past two years. Minecraft fans are loyal, with nearly 90 percent of paid customers on the PC having signed in within the past 12 months.