Microsoft is still not certain over the product editions for Windows Vista. Some confusing signals have come down from Redmond in the past few days.

However, Paul Thurrott has pieced together the information available, so here are the six Windows Vista Product Editions, as surmised by Paul:

Windows Starter 2007 (Previously Windows Vista Starter Edition). This version does not use the Vista branding because it will not include the Aero graphics display found in the Vista line of products, and will only ship in a 32-bit version.

Windows Vista Home Basic (and Home Basic N). A simple version of Windows Vista that is aimed at single PC homes. Windows Vista Home Basic is the baseline version of Windows Vista, and the version that all other product editions will build from. Home Basic N is aimed at the EU and will lack Windows Media Player.

Windows Vista Home Premium. Whole home entertainment and personal productivity throughout the home and on the go. As a true superset of Home Basic, Windows Vista Home Premium Edition will include everything from Home Basic, as well as Media Center and Media Center Extender functionality (including Cable Card support).

Windows Vista Business (and Business N) (Previously Windows Vista Professional Edition). Windows Vista Business is roughly analogous to XP Pro today. This version is aimed at business decision makers and IT managers and generalists. Business N is aimed at the EU and will lack Windows Media Player.

Windows Vista Enterprise. Optimized for the enterprise, this version will be a true superset of Windows Vista Pro Edition. It will also include unique features such as Virtual PC, the multi-language user interface (MUI), and the Secure Startup/full volume encryption security technologies (”Cornerstone”). There is no analogous XP version for this product.

Windows Vista Ultimate. The best operating system ever offered for a personal PC, optimized for the individual. Windows Vista Ultimate Edition is a superset of both Vista Home Premium and Vista Business, so it includes all of the features of both of those product versions, plus other features.

You’ve just gotta go for that “Ultimate”, haven’t you?