And then they got into even more trouble when they sued Microsoft over IP they didn't own or invent.
No, what Apple sued MS for were interface elements and implementations of concepts that had been lifted directly from Mac OS and implemented in Windows!
Apple got in "trouble" because Steve had allowed access to the Mac OS without restriction or tight contract in place! That's why Apple couldn't win outright.
Apple was inspired by what they saw at Xerox Park, and paid for the access. But Apple developed their own code to implement the ideas that inspired them. The OS and interface developed by Apple went far beyond the one for the Alto -- it extended to the whole OS for a consistent UI across apps; and it introduced loads of new concepts, including floating and draggable windows that could overlay one another on the fly as the OS redrew them.
MS had direct access to the Mac OS in order to develop Word for Mac. There was no such thing as Windows -- it wasn't even a gleam in Bill's eye. Steve thought a gentleman's agreement was enough to keep Bill from lifting code and concepts from Mac OS and copying them. Steve was wrong, perhaps naive. Bill was acting to form as a sharp businessman incapable of originality or taste of his own. ...then calling it "Windows" -- the part that was actually developed by Apple -- is a little like someone starting a restaurant called Ronald's Large Macs.
As it happened, Windows wasn't really usable until '95, ten years later, even though it was literally handed to them on a platter; but the damage had been done. I guess MS is perpetually ten years behind, and still trying to freeze the enterprise with promises and vaporware that are never delivered.
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