I looked it up as I was curious.

Apple and Microsoft both licensed some interface stuff from Xerox and they were both working on a windows like OS.

Apple was ahead, and gave them a sneak preview.

Then I guess MS wanted to do something like that and told Apple they’d give them time a frame they wouldn’t release anything in (like a year or two later) and then they said fuck it and released it early.

Then Apple sued MS.

So MS stole good parts of windows from Apple.