Question : Netmeeting as a chat tool for official purpose

Hi, I would like to use netmeeting as chat tool within our organisation and need to integrate with the AD. how do I set up the netmeeting server (windows media server or whatsoever) and integrate with AD. Do I need any additional lisence. Also need restrict within our orgnization (All our internet traffic is going through FW).
Thanks

Answer : Netmeeting as a chat tool for official purpose

yet to receive an expert comment on above