While I can’t exactly put my finger on it, I just didn’t find Microsoft Virtual Earth as pleasant to use. The interface wasn’t as smooth, the mapping wasn’t as clear, and the satellite photos weren’t as close. Zooming in almost always resulted in a loss of image.
It just seems that Google is just doing whatever they damn well please, and having a great time. For example, try zooming in to Google Moon. On the other hand, Microsoft seems to be stuck playing a game of catch up, and not playing very well. I think they’re finding it a bit difficult to have other people calling the shots, and perhaps they have forgotten how to play the game.