I have to disagree with your history report. Apple eventually lost that suit because of a technically ignorant judge. The Microsoft investment in Apple was at the time a little over 4% of the value of the outstanding Apple stock. The stock purchased was non-voting. At no time did Microsoft own "20%" of Apple.
Oh, Xerox licensed its GUI ideas to Apple. Some still think they were "stolen."
More MacMythology. Apple DID NOT license the GUI - you could not more wrong. Xerox was an investor in Apple so they let them see what they were working on - Apple stole the ideas and latter tried to claim the GUI was their own copyrighted idea. Xerox sued Apple