If this design makes you uneasy and go "But that's not Microsoft!", slap your gut and tell it to listen because that's just the branding talking. Take a step back and recognize that EVERY emotion you feel about Microsoft is arbitrary. Branding is just the mental handle we use to talk about the automatic emotions we get. That is the tough part about branding: it happens unconsciously. It is that surge of instantaneous feeling that bypasses logic.
Engineering brands is reprogramming everyone's gut reaction. Our "gut" reaction feels right by definition (a tautology) and everything else feels wrong. It is only with conscious thought can we fight it.
We as web developers know the power of the "default". Imagine that! Being able to set everyone's default setting to a selection of your choosing is like a superpower.
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Changing brand is always an ugly business. For example, think back in high school about the personal brand you exuded on campus.
One day, you decided to start dressing in jeans and wearing a motorcyclist black leather jacket everyday. You get comments like "But that's not you! Why are you trying to be someone else? Stop being a phony." It feels impossible that you'll ever be accepted as a badass motorcycle jockey. The next day, you drive an actual motorcycle to campus. People see you driving a motorcycle. In the coming weeks, you offer rides to select people. Those people now start raving about your motorcycle and how "cool" you are.
We revisit the same campus 3 years later and people can't imagine you not as a badass motorcycle guy. You might ask, "Did you know that I use to be a nerd?" They reply, "But that's impossible! There is NO way that's true."
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Ask a teenager: "Did you know that Apple use to be a terrible company with mediocre computers, losing money and weeks from going out of business?"
Answer: "What? But that's impossible! I don't believe you."
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For Microsoft to make a big change, it should be that big, sudden announcement of that branding change. It will appear unfamiliar, it will appear strange, they might even appear phony. That's when the process begins. In the coming weeks, Microsoft publicizes new products that incorporate their new paradigm. Sleek, minimal, digital, modern. They even snag a few early adopters that try out the new products. You start getting friends that rave about the new products.
It is during this process that you go from feeling that its impossible that Microsoft is cool, to feeling that it's inevitable that it's cool. That is the magic of branding: the ability to reprogram the gut to have one thing be absolutely right and have everything else feel wrong, unnatural or impossible.