USC Marshall School of Business

Business Insider ran a column by Ira Kalb of the USC Marshall School about Microsoft "declaring war" on Apple. The declaration, made to the press by Microsoft CEO Steve Ballmer, has little effect on Apple's 63 percent market share of the tablet shipment market, Kalb wrote. "Steve Ballmer declaring war on Apple is one thing," Kalb added. "Fighting the war and winning is another."