I have been using LCS 2005 and PIC with AOL / MSN / Yahoo for about 2 years. I just replaced our LCS 2005 Access Proxy with a OCS 2007 Edge server. Everything is working perfect except for PIC with AOL / MSN / Yahoo. I have 3 IM service providers configured and all our "allowed": Yahoo! ... AOL ... MSN
The OCS event log keeps showing the following error too:
Federated partner federation.messenger.msn.com has sent a significant number of messages that have resulted in domain validation failures. There have been 7 such failures in the last 19 minutes.There have been 55 errors in total. This can happen when messages are sent to local users that don't exist, messages are sent from domains that the partner isn't allowed to send from, or when the partner sends messages destined to domains that this organization isn't responsible for.
Any ideas on where to even begin? This new Edge server has a different public IP than my previous Access Proxy. Does that matter? It has the same certificate name on the external edge as the access proxy did.