Of all the comments so far on this, this is maybe the coolest. You can really see how Office on OSX has shaped up (if you follow the beta; identical Windows and OSX support on launch day instead of OSX getting it 2 years later like it's been for the past decade), but I'm surprised Android also shares a significant amount of the code base.
It cuts down on bugs, and also makes sure the bugs that are on the desktop are also the same ones on my phone (principal of least surprise at work).
