By now you’ve seen two different elements of the Windows 8 design—first, a Metro style user interface we showed previously and in a video seen by millions of folks. And recently, we have described in this blog some of the enhancements we’re making to familiar Windows desktop tools such as Explorer and the copy file dialog. We’ve seen a lot of dialog about these changes.

Some of you are probably wondering how these parts work together to create a harmonious experience. Are there two user interfaces? Why not move on to a Metro style experience everywhere? On the other hand, others have been suggesting that Metro is only for tablets and touch, and we should avoid “dumbing down” Windows 8 with that design.

This is a balancing act, and one we’ll be talking quite a lot about in this blog in the coming months. Having both of user interfaces together harmoniously is an important part of Windows 8. As a starting point for the discussion, here is how we approached the design of Windows 8 from the very beginning.

We started planning Windows 8 during the summer of 2009 (before Windows 7 shipped). From the start, our approach has been to reimagine Windows, and to be open to revisiting even the most basic elements of the user model, the platform and APIs, and the architectures we support.  Our goal was a no compromise design.

This is an ambitious undertaking—it involves tools, APIs, languages, UI conventions, and even some of the most basic assumptions about a PC. For example, how do you isolate applications from each other, or prevent applications from stealing all your battery power? How can installing (and removing) apps be as quick and painless as changing the channel on the TV? How do you attract the broadest set of developers possible to a new platform? How do you build a touch-first interface with a unique point of view?

When we showed the first demos of Windows 8, we introduced our new Metro experience—fast and fluid, immersive, beautiful, and app-centric. We are certain that as we show you more in the coming months you will see just how deeply we have reimagined Windows.  Metro style is much more than the visual design as we shall see.

At the same time, we recognized that Windows 7 has been a huge success. Not just as measured by sales figures or by the number of people using it, but also by the depth of usage. Hundreds of millions of people rely on the Windows 7 UI and existing Windows apps and devices every day, and would value (and expect) us to bring forward aspects of that experience to their next PCs.

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