This is an interesting question, Windows looks like the Mac GUI and by the time Windows 3.X came up it resembled the Macintosh. Apple sued Microsoft but it took a long time. Steve Jobs had been away from Apple because the original Macintosh was a failure. He founded Next Inc. to make Next Cubes using BSD Unix and the MACH Kernel when Steve Jobs came back to Apple he merged NextOS and MacOS into MacOSX and saved Apple after Bill Gates and Microsoft bought non-voting stock in Apple to pump in some money. The GUI suit was settled out of court and both Apple and Microsoft agreed to share technology.
Apple got the GUI from Xerox with selling them Apple stock to get a tour of the Xerox PARC center. So when Xerox sued Apple, the result was Apple’s GUI was different enough from the Xerox PRC GUI that the court suit was decided in favor of Apple. Which might have hurt Apple’s case against Microsoft?
So did Bill Gates steal from Steve Jobs? Yes, but they both were friends that got into many shenanigans with each other. Windows dd copy the Mac GUI, but what is IP theft between friends?
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