Is the Express Messenger still running? Did you reset it by reseating card?? Do this HOT. Does it work after reseating?? I haven't worked with a EM for a while, but I think that is what I have done before with good success.

I see that you are Mitel dealers---you've probably already tried that.

I think that you have to determine whether or not it's the PMS (as Dane has suggested) or the EM.