I keep searching in Free apps and List of portable apps but no one tried to put LAN Messenger in the sourceforge and it's a great app. Specially if someone trying to create or build an Intranet. I keep looking for some apps that I can use for intranet but most are online apps.
Yeah, Qualia LAN Messenger is good but old and sometimes keep disconnecting for some reason but not crashing in my place, I will try IP Messenger that you recommend.