@Tarik and @Jojo
I think you guys interpret way too much into the presence of our MacBooks. First of all, the one I'm using is a backup machine because my actual laptop (a fabulous ThinkPad W530) couldn't project. Why? Because I'm passionate about Windows and I'm generally running the latest builds. As you can imagine, that doesn't always work great with all hardware, especially projectors.
Secondly, it is true that many devs on our team use MacBooks. It's the easiest way to run all OS we support (Windows, Mac, and Linux).
Thirdly, Microsoft is an employer that values diversity. When you walk over the campus, you'll find all sorts of hardware (for business as well as personal use). I fail to see how this can possibly be a bad thing. In the end, our customers expect us to support our software in wide variety of scenarios.