Crane Driver asks:

Can anyone explain how Micro$oft work out this new system to be only version 7 of Windoze?

Windows: Start to Seven says:

"Nearly a quarter-century has passed since Microsoft launched its first graphical user interface operating system. When Windows 7 is released this week, it will be the 29th version of the Windows operating system. Vista didn't rock the computing world, but it wasn't Microsoft's first failure. Here's a look at the highs and lows of Windows long history."

Maybe they only count the good (better?) ones.

John