Microsoft Windows Vista is designed to dramatically improve the computing experience of every kind of PC user - from people at home who use their PCs for simple web browsing, to business people who must organize and act on large volumes of data, to scientists who routinely perform complex mathematical analysis.
To make sure that everyone has an offering tailored to meet their specific needs, Microsoft will deliver five different editions of Windows Vista. Each edition is focused on the needs of a specific type of person. Vista Ultimate is the most complete edition for work and entertainment.
Microsoft Windows Vista OEM products are only for sale to system builders and small OEMs( Original Equipment Manufacturers) who manufacture computer systems and preinstall the software onto those systems.