BOSTON, Mass. : MacWorld bomb shell? Steve Jobs, Apple's not-chairman, mentioned in the closer on his opening address this morning, that, oh yes, by the way, Microsoft is going to be investing $150 million in the troubled Cupertino company. What does Bill Gates get for his money? A stock that at 19 3/4 is a relative bargain in today's hyper bull market. More important, keeping Apple afloat allows Gates to continue to use the alternative to Windows as his hole card in federal antitrust investigations. But looking down the long road ahead, does Bill have deeper designs in Mac's operating system? Discuss.