Even in the Mafia, they do have a code of honor. More so.
It is always the people that thieve, that stress on having honest people working for them. It makes it easier.
I am not saying that M$ is evil, but I am saying 'no evil company' would encourage their subordinates to lie and cheat, mostly because they will cheat the company.
The point I am making, is just because the top management keeps stressing on honesty, integrity, generosity.... does not mean they are ethical themselves Nor would you in your day to day dealings with them guess they would be unethical.
my 2 cents.