This post is about the ports in use for Windows Messenger and Live Communications Server.

VERY IMPORTANT: only the IM traffic goes through the LCS server, all other traffic is peer to peer.

Firewalls and Windows MessengerOptions exist for using the advanced features of Windows Messenger with a non-UPNP firewall. Points to consider on this topic include:

• Peers on the same side of the firewall can use all of the features of Windows Messenger.
• IM and Presence will work through m