Earlier this month Microsoft announced plans to buy the code-hosting and collaboration site GitHub for $7.5 billion. It's hard to overstate how important GitHub is to modern software development. The service boasts about 28 million users and hosts 85 million codebases for a wide variety of organizations, including Apple, Amazon, Facebook, Google, Walmart, and the US government. Much is open source code, a far cry from Microsoft’s roots making highly proprietary software.

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