Here then are the stupid stages of Windows names.
STAGE 1 - COMMON SENSE - NUMBERS
What could be simplier than naming your product version 1 - 2 - 3? Easy!
STAGE 2 - GETTING WEIRD - TWO LETTERS
For some reason Windows 4 was not chosen as a name. Instead Microsoft began gluing two letters to the end of the product for no particular reason. Let the confusion begin!
STAGE 3 - THE BROKENNESS OF VISTA
Not only did Microsoft pick an out of the blue sky oddball name for this release but they also botched the product. An overly ambitious update, Vista had problems at launch which were finally fixed. But they gave the product a terrible reputation and sales were poor.
STAGE 4 - COMMON SENSE - NUMBERS
Suddenly Microsoft got common sense and started naming their products after numbers again. This is probably because 7 is considered a lucky number in English. But don't expect too much sense making from Redmond. They totally skipped Windows 9 and went straight to Windows 10. What happened to 9? Was it caught molesting children?
This doesn't even take into account that each version of Windows you just read about also comes in four or five flavors of it's own. This leads to extra-stupid naming conventions like Windows Vista Home Premium Pro Mobile. Erf! Lots of computer users barely know if they are using Mac or Windows, much less Windows 7 Professional Ultimate Home Mobile.
You can find more good consumer advice for folks in West Hollywood and Beverly Hills at WehoComputerRepair.com. More about THIS issue with Microsoft here at How Microsoft Ignores Own Customers.