I'm looking for a way to send out notification to users using MSN/Yahoo/AOL
messenger. I heard of that Live Communication Server can do that (version
2003 to MSN, upcoming version 2005 to all 3 kinds of clients). Can anyone
confirm that? What is Connetor Service? Do I need it or all I need just that?

LCS 2005 will be able to connect to third party IM clients using a connector.
The connector will connect to the appropriate third party server. Im not
sure if MS released a price for the connector. LCS 2003 and 2005 clients can
connect to third party IM clients through other vendors as well. FaceTime,
IM Auditor, and Rivotec to name a few. The LCS 2005 SE or EE with federation
and with remote access enabled has the ability to connect to other enterprise
LCS clients.

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