Because 7 8 9.
Because windows 7 8 9
Because Windows 8 9.
9 polar bears
Because 7.. 8.. 9
Astro-knots.
Gingerly.
Hey Microsoft, why is there no Windows 9? You've given us 7 and 8, and now you're skipping straight to 10?" "Well, to be completely honest, 7 8 9."