I looked it up as I was curious.

Apple and Microsodt 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 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.