Report Offensive Message

How do you block MSG.EXE from sending messages in Vista?
In Classics Rock, I highlighted a tip from 1999 about how to keep NetWare users from messaging each other. Plus, I discussed how to disable Net Send in a Windows environment.

http://blogs.techrepublic.com.com/classic-tech/?p=209

Windows Vista however includes MSG.EXE which does the same thing, but not via the Messenger service like Net Send. Short of erasing MSG.EXE can anyone think to how to disable it or block message transmissions?
12th Dec 2008