One quick question from a CNET interview with Bill Gates can give you a good feel for what Microsoft is not.
CNET: So that would be the philosophical difference between Microsoft and what Google is up to at this point?
Gates: Well, we don't know everything they are up to, but we do know their slogan and we disagree with that.
I wasn't sure what he meant by that so I went to the Google corporate info site to see what the basic principles are they espouse, with which I guess we can assume Microsoft disagrees. Under "Corporate Philosophy" I found these Ten Things (4 and 6 could be the problem) or I could see Microsoft having a problem with all of Google's Software Principles.
Of course it could lay right in the first line of the Company Overview, "Google's mission is to organize the world's information and make it universally accessible and useful." Microsoft's view is almost identical but the phrase, "only to people running Microsoft software on computers running Microsoft operating systems" would be appended.