network messaging

I'm running a small App called Talking Caller ID. It reads the caller ID
from a computer modem, logs it and displays a pop up with the caller Info on
the screen.

It also broadcasts that info to the entire workgroup on our network. this is
accomplished through the windows Messenger Service (NOT! Microsoft
Messenger) running on the XP clients on the network.

I cant seem to get this to come up on the Vista Clients and the messenger
service is not included in Vista. Does anyone have any ideas on how to get
this to work? and is the message queueing service in vista a replacement for
messenger service that came with XP