Windows 9.

That's the thing about positive integers: you can't run out of them.

Tell that to 9223372036854775808.

Aleph-naught bottles of beer on the wall!

Aleph-naught bottles of beer!

Take one down, pass it around.

Aleph-naught bottles of beer on the wall!

Windows 1.0 was 28 years ago. There will be exactly zero confusion if they recycled the (IMO superior) name.

Until the next version.

Windows One 2? Windows 360? Windows 12?

We have already established the One comes after 360.

I thought it went one s, one x, one and one....

Where does OnePlus fall into all this?

Uhmm, my guess is they skipped 9 to avoid confusion with the 9x versions.

If this is true, then focus groups has failed the marketing team.

That didn't stop them from doing Xbox One.

Onedows.

I think they should think about the new wearable hardware that will be coming out and come up with a name that would evoke an image of working with apps in the air in front of you instead of on a screen/flat surface with a window. Like a Minority Report style interface.