There is a reason the iPad does not come with a keyboard, and it may not be the reason you think. You will never see an iPad advertised with a keyboard, either, even though there are very good keyboards made for it. Apple even sells them in their retail stores. For the exact opposite reasons, you will never see a Windows tablet advertised without a keyboard. I am not aware of any that come with a keyboard out of the box. But Microsoft, Nokia, and others build keyboards for the tablets they offer.