Well, Windows XP Media Center Edition 2005 is an Entertainment Operating System like Windows ME,Vista Home Premium and Ultimate. (Also Includes Windows 7) Windows XP MCE Comes with the Service Pack 3 and It does not Include Product Key for it. It looks sports visual design and sleek look.Also,Windows XP Media Center Edition has loads of Microsoft Plus! Programs like Windows Dancer, Microsoft Plus! Themes and Screensavers.