The idea of a monolithic website like Apple's or Google's just doesn't apply. It's not part of Microsoft's DNA. Compare:
http://msdn.microsoft.com/en-US/
http://windows.microsoft.com/en-US/windows/home
https://www.microsoft.com/en-us/default.aspx
http://research.microsoft.com/en-us/
http://www.microsoft.com/windowsphone/en-us/default.aspx
http://www.microsoft.com/visualstudio/en-us/products/2010-ed...
http://expression.microsoft.com/en-us/cc184874.aspx
http://technet.microsoft.com/en-us/ms376608.aspx
Other than white backgrounds, it's not very consistent.