Since Microsoft introduced four different SKUs of Windows Vista into the marketplace, would be Windows buyers have been... confused. Home Basic, Home Premium, Business, and Ultimate offered different features at each level, taking away some and putting some back depending on which edition you bought.
There are actually six different flavors of Vista (excluding the 32-bit vs. 64-bit variants of all but Starter) all together. The fifth was Windows Vista Starter, an edition limited in functionality for emerging markets with basic needs. The sixth, and less known version is Vista Enterprise, a business specific edition only available through Microsoft's Software Assurance program.
