We think the coolest announcement at Microsoft's Windows 10 demo was HoloLens, technology that brings high-definition holograms to life in your world. Watch Video

We know (or at least we agree with the industry insiders) that the most important announcement was that Windows 10 will be delivered as a Service. 

Terry Myerson, Microsoft's Executive VP of Operating Systems, said  "With Windows 10, the experience will evolve and get even better over time. We'll deliver new features when they're ready, not waiting for the next major release. We think of Windows as a Service - in fact, one could reasonably think of Windows in the next couple of years as one of the largest Internet services on the planet."  Read More