Microsoft may reconsider its decision to pull Windows XP off the shelves in June if it sees enough customer demand, CEO Steve Ballmer said -- despite a huge customer outcry over the decision. Speaking at Louvain-La-Neuve University in Belgium, Ballmer also said it's a "statistical truth" that most people who buy PCs today buy them with Vista. Some customers have complained that they must buy PCs pre-loaded with XP as small businesses and can't get them at retail stores.