Windows XP originally shipped in two flavors – Home and Professional. Later on Microsoft confused the issue by introducing the Tablet PC Edition, the Media Center Edition, and the x64 Edition. Five different SKUs for what is essentially the same product.
You’d think that with Windows Vista they’d end this retardation and just release a single, unified installation disc that’d install “Windows Vista” and be done with it.
Sadly, this is not the case, as they intend to provide Windows Vista in seven different flavors. Seven!