Remember when Vista was announced, and Microsoft decided to release six different versions of the operating system, much to the confusion, disappointment, and ridicule of potential buyers? Well guess what? Microsoft is back with the Windows 7 strategy. What has it learned in the last three years? Pretty much nothing. While Microsoft is touting the "two primary editions" of Windows 7 -- a Home Premium edition and a Professional (intended for business) edition -- the fact is it's sticking with the same six different versions (or SKUs, stock-keeping units) that it had for Vista. The real difference is that Windows...