Secondly, the version of IE on Windows Phone 7 is actually IE Mobile 9, which is not the same thing as desktop IE9 (just as the Mozilla-based MicroB on the N900 is not the same thing as Mozilla Firefox); they could just as easily called it Fred.
Lumia ads here on tv are horrible. E.g. this http://www.youtube.com/watch?v=6DE-ocFoKTA