I too am interested in finding out how to block wlm. We are actually using a Nitix network...so i am able to block certain sites but they are still being able to log on to wlm. Is anyone familiar with Nitix...and how to block wlm? Or even know of which sites to block to block it.... I'm not able to block ports...or haven't seen how i would be able to do it... but it is driving me crazy...if not anyone know or has hear of any good blocking programs out there? Thanks...

I haven't heard of Nitix network but why don't you try diabling windows live messenger?
Have you tried that yet? Or is this only for certain time?