Ok i made i post, but deleted it because i didn't carefully read the first post
First get reshack here (if you did not had it already):
http://delphi.icm.edu.pl/ftp/tools/ResHack.zip
Open reshack, in reshack press file -> open and go to select the msnmsgr.exe in your wlm folder.
Go to Version info -> 1 -> 1033.
Now this part is important, ONLY change change the field that i put a red circle on, change it from 9.0.1407 to 14.0.5027.
Now press compile script and go to file -> save, make sure wlm is closed.
This way Msg Plus! still knows it's the old wlm 9, but Microsoft his servers think it's the new wlm.
Here is the screen:
Note: Nothing get's changed/edited with Msg Plus!