If you search for cloud computing on Bing you get the Microsoft Cloud Services as the first organic result, and the Wikipedia page as the second.

For the same search on Google returns the Wikipedia page as the first result, and the Microsoft Cloud Services does not even appear in the first page. Interestingly enough, Microsoft Cloud Services is the first paid result with Google.

It seems that Microsoft is fiddling with search results to pass of a paid search result as an organic one.