Ever since they started in the '80s, Apple's Mac operating system and Microsoft's Windows have followed different paths to attaining different goals. Windows went after market share; Mac focused on a seamless user experience. Beneath the superficial surface features, what are the real core differences between the two operating systems? Ask a Mac OS X fan or a Windows fan what the difference is between the two operating systems, and the short answer might be something like, "The difference is, the one I use doesn't stink." That response may underscore the emotional pull an operating system has with a particular...