http://www.eurogamer.net/articles/2011-08-24-microsofts-chris-lewis-interview
Eurogamer: So when you say number one you mean sales?
Chris Lewis: I mean purely install base with consumers. We don't count units unless they're actually out there and installed. This isn't shipments. This isn't revenue. This is install base of consoles.
In Germany this coming year, for instance, we're going to spend a considerable amount of money in the media. That isn't something we've done in previous years. We've invested very deliberately in Germany.
With what you can see here, with what I know is coming that I can't talk to you about right now, both by way of content for the core, and the entertainment partnerships we're negotiating for Xbox Live, I wouldn't trade with anybody.
I don't want to be dismissive of what our competition is doing. They keep us very much on our toes, but knowing what I know, and knowing what I've seen, I wouldn't trade places.
MS have something planned, they're so determined to be up YoY and first place.