Why this matters: A number of fitness bands already track your activity, even sleep. Fewer still, though, deliver messages calendar invites. And, barely any smartwatches beyond the Big Three -- Apple, Google, and now Microsoft -- provide any intelligence that helps you anticipate and plan your day. Microsoft's Intelligence Engine and Cortana appear to be the pair of intelligent technologies that Microsoft hopes will inspire you to plunk down $200, rather than opt for the aesthetics of the Apple Watch or Google's ecosystem.