I think there are no TM inconvenience
Livemessenger.com can not be under TM protection, and livemsnger.com is therefore a valid name for a live messenger.
And livemsn.com is only the short way for livemsnger.com
So I can´t see your Microsoft´s atorney point of view???
Anyway, they know which is my e-mail adress if the have any doubt...
welcomefuture.com