I know the web world is different, but a couple of years back nobody from my product group was allowed to install a competitor product and play with it as it would cause IP prior art issues. Most of the developers did it anyhow, they just would not admit to it. However, I did not know of a single manager who really did it. So I would not be surprised if the managers had an executive policy which did not allow them to see other products. This was at a three lettered big company and not MS though.