Office is a completely different kind of application from iTunes and video players. The interface will therefore be different as well. Comparing a product 8 years old to something 8 months old isn't fair, anyway.
Plenty of Microsoft products support contextual user interfaces - all the windows and tabs in Visual Studio can be set to auto-hide and placed on the margins of the window so that mousing over them exposes them (like in IntelliJ IDEA). It works especially well for doing demos and working on low-resolution displays like laptops, but I use it that way anyway because I love the relatively minimalist feel it has (I disable the menu bar, scroll bar, and tool bar in Emacs, too).
Beyond that, observing that Apple pays more attention to the user interface than Microsoft is trite.
Plenty of Microsoft products support contextual user interfaces - all the windows and tabs in Visual Studio can be set to auto-hide and placed on the margins of the window so that mousing over them exposes them (like in IntelliJ IDEA). It works especially well for doing demos and working on low-resolution displays like laptops, but I use it that way anyway because I love the relatively minimalist feel it has (I disable the menu bar, scroll bar, and tool bar in Emacs, too).
Beyond that, observing that Apple pays more attention to the user interface than Microsoft is trite.