Rivalry? In 2001? When only 2 years earlier Billy boy had to buy Apple's shares to keep them afloat? I know Billy boy did that to get off the hook with US govt., not like he was any saint - but from that to "rivalry" is a tall order.
Microsoft invested a grand total of $250 million in Apple. Apple turned around during that same quarter and spent $100 million on Power Computings Mac license. Apple didn’t become profitable until years later. The $150 wouldn’t have saved Apple.