"It's easy to dismiss this project by saying, "It's just a page. Big deal." That would miss the point entirely. It would also be entirely inaccurate. The Micrsoft.com ..."
mscom is only the front page and a small subset of what you might think of as "microsoft.com". Each vertical has its own team, servers, and release cadence; it isn't a setup optimized for brand cohesion.
As far as I can see, Microsoft.com is an improvement on a single page. I would be far more impressed if the changes extended across the site.