Communicator 2007 – cannot synchronize address book
When this error is seen in the Communicator 2007 and Communicator 2007 R2 client, it can be a number of issues. Here’s a few steps to check: Validate the password for the service account (RTCComponentService) used on the AppPool “LSGroupExpAppPool” Make sure the AppPool is started “LSGroupExpAppPool” Make sure the default website running the /Abs – application has a SSL certificate applied and that it’s responding on port 443 (https) Shut down and restart the …