The New Windows(R) 7 includes this new sub version labeled as: "K", "N" and "KN"
I am going to simplify it for you:
- K: Stands for Korea and it has no Messenger(R).
- N: Stands for No Media playback. ie. No Windows(R) Media Player and Windows(R) Movie Maker
- KN: Stands for No Messenger and No Media Playback.