Windows 2000 Disks Quota Warning Levels

Hi everyone, I have been trying to enable some warning levels on my server. My quota is set this way.

120MB MAX ALLOWED
90MB WARNING
DENY DISK SPACE IF 120MB IS REACHED

The problem is that I was expecting a regular user to receive a warningmessage as soon as he reaches the 90MB warning level setting but it’s not happening. How do I set it so the users get the warning message??