In general, Microsoft's approach to the web has always been, get stuff out there and accessible. Unlike Apple or Google, there isn't top down control over all their web presence.
I have theorized that this aspect of Microsoft culture comes in part from having had so many millionaire employees at the dawn of the commercial web.
What I find curious is that hacks created by Microsoft's MVP approach to web properties finds so little resonance with HN'ers.
It is pretty amazing that there are 5+ navigation schemes on one page.
http://www.microsoft.com/mac/outlook
If only that group could share more of its expertise with the rest of the company. :)