As a long time Microsoft employee, I am saddened and sometimes embarassed by the consistently, um, poor quality of our ads. It makes me very happy when I see a great ad coming out of the company. Invariably, it seems that they come out of our international subsidiaries and not Redmond.
Here's a very well done and funny ad from the Dutch sub. Here's the blog of the guy who did the ad.
Here's an old one from the New Zealand sub that was fantastic too. I think it was pulled though by the corporate police. Too bad.