We have a setup with CUPS 7.0(2) and Exchange 2007. I have configured the Presence Gateway and installed the CA certificate on CUPS.
The CUPS users show Calendar Integration as Disabled. Can you enable the Calendar Integration on per user base? If so, where can that setting be enabled? The Integration Guide doesn't mention anything.
You can also enable it through CUPC (File, Preferences, Status "Show me in a meeting when my outlook Calendar shows me as busy".
It took a while to get it working, but once it started working it has been great.
The biggest thing is to double check the user that is setup for the integration.
I found it yesterday. You need to log the user in the CUPC User webpage (like ccumuser page, but for cupc). IT's in the options and enable.
I have yet to get my to work. Still monkey around with the ports, etc.