I was reading in
Brian's blog yesterday that Microsoft is currently getting a ~70% profit margin on their windows and office products.
what they forgot to take into account was how much the product-development and R&D costs were to develop office.
So while 70% seems high at the moment, I'm sure a good portion of that is made up of paying themselves back for the time spent developing the thing in the first place.
Update: Brian clued me in a bit. It was his original post.
Update2: it wasn't product-dev or R&D, but general corporate expenses