Yeah but Apple did it with Xerox's cooperation where Microsoft stole the idea and spent years in the courts with Apple suing them, but Apple did loose in the end.
Mac OS X is actually NeXT OpenStep that Apple bought from Steve Jobs which was the OS his company created when Apple fired him back in the early eighties and has been made to look and work somewhat like the old Mac Classic OS.
If you Google around you can find info.
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