Microsoft and Apple have been battling for 40 years. Who's got the upper hand now?Microsoft (MSFT -2.02%) and Apple (AAPL -0.83%) have been tech archrivals for roughly 40 years, since the dawn of the personal computer.The two companies have different routes to dominance of the tech industry. Microsoft has largely climbed the ladder through its ubiquitous Windows operating system, dominance of enterprise software, and, more recently, its strength in cloud infrastructure. Apple, meanwhile, has reached a marke ...