Office Communicator 2007 R2, Outlook integration error

I recently installed Office 2010 Beta 64-bit on a Win 7 pro 64-bit. I installed the OCS Communicator 2007 R2 and gets this Outlook integration error:

"Communicator could not determine the location of your Exchange Web Services.
Your Outlook calendar information and Out of Office message may not be available and your calls may not be forwarded based on your working hours.
Communicator will try retrieve this information again later. If this problem persists, contact your system administrator."

I didn´t pay much attention to this in the begining but it starts to annoy me more and more. Nothing will be saved in my Conversation History and it will not pick up my outlook calendar meetings and change the status in the communicator.

And this was not a problem before a went from Outlook 2007 to Outlook 2010 Beta.


Communicator version: 3.5.6907.83
Outlook version: 14.0.4536.1000 (64-bit)
Exchange 2003 SP2

Please help!