Microsoft agree the shares and they were powerless shares, they had no control over Apple whatsoever. They sold the shares in 2001.
Not to mention, Microsoft got a patent sharing agreement out of the deal (where Apple and Microsoft shared OS patents for a period of 10 years, they likely have a similar agreement even today) and the promise of Apple not to continue suing them (in various ways) for stealing their GUI.
However, the entire thing was a PR stunt by Steve Jobs to reassure investors on Wall Street. It was a "Look what Steve Jobs did." event. Apple could have survived without Microsoft's measly 150 million. They had 1.2 billion in the bank at the time (not to mention roughly 8 billion in assets), but no future product line.
, As far as I'm aware the Xerox board of Directors didn't really understand what the ALTO computer was and what it did. This of course was developed at Xerox PARC, when steve toured the facility they were more than happy to give it to him and i think he threw in Shares from Apple as well.
Xerox made major bank off its Apple shares. However, it wasn't anything near what they would have earned if they would have pursued getting the GUI out to home users themselves.