Though these plans could change, Microsoft is currently planning to ship an amazing array of product editions, or SKUs, in the Windows Longhorn family. These are the currently-scheduled versions that will ship in May 2006:
Longhorn Starter Edition Analogous to Windows XP Starter Edition.
Longhorn Home Edition Analogous to Windows XP Home Edition.
Longhorn Media Center Edition A superset of Home Edition that includes the Media Center functionality. Analogous to XP Media Center Edition.
Longhorn Professional Edition Analogous to Windows XP Professional Edition.
Longhorn Small Business Edition A new product edition aimed at the small business market. Currently very similar to XP Professional Edition.
Longhorn Mobility/Tablet PC Edition Analogous to Windows XP Tablet PC Edition.
Longhorn Premium Edition A new product edition that bridges the consumer and business versions and includes all of the features from the Home, Premium, Pro, Small Business, and Tablet PC Editions (but not Starter Edition).
The new Premium edition will also add value to Microsoft's business-oriented Software Assurance (SA) customers. None of these product names are final, of course, and all versions except Starter Edition will ship in both 32-bit (x86) and 64-bit (x64) variants. One of the problems with this approach is that Microsoft will have a hard time communicating the differences between each SKU, in my opinion. It will be interesting to see how this develops. My advice would be to cut back on the SKUs and offer only consumer and business versions. The consumer version should include everything from Home and Premium/Media Center Editions, while the business version should include the features from Pro, Small Business, and Tablet PC Editions.