I don't know NoN.
I found some other differences here: MSE Prerelease Version 4.1.522.0 - Microsoft Answers
Take note of rhabdomantist's answer at the bottom of his post:
My update said nothing of a "pre-release"
I see your recent post, let me explain, that 1.125 is the AVD version I had when I updated MSE client the last time back in April.
It is the "old version"
I was up to AVD1.137 when this Sept. client update came in.
MSE on my XP box doesn't even have NIS listed.