Microsoft spent years maliciously introducing changes to the Office file formats that broke compatibility with iWork, which Apple countered by paying an army of coders to swiftly analyze these new formats and update iWork to maintain compatibility with them:
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Adversarial Interoperability: Reviving an Elegant Weapon From a More Civilized Age to Slay Today's Monopolies
Today, Apple is one of the largest, most profitable companies on Earth, but in the early 2000s, the company was fighting for its life. Microsoft's Windows operating system was ascendant, and Microsoft...