Described by the UC Guys, you can now install OCS 2007 R2 on the latest Microsoft OS, Windows 2008 R2.

I tried to login to OCS Web Access (OCS 2007 R2), but I received the following error :

Cannot sign in because the server is temporarily unavailable.

I logged on to the Web Access server and saw that all services where running. With IIS manager I also noticed that the webservice was running and had the correct certificate. I started the Management console for “Microsof Office Communications Server 2007 R2, Communicator Web Access”. Here the information stated that the Read more »

I had a weird issue which occured at the communicator client (R2). The OCS (Office Communication Server) is version 2007 R2.

When I logged in (internal), the client had an exclamation mark. The following 2 errors occured :

Cannot synchronize with the corporate address book. This may be because the proxy server setting in your web browser does not allow access to the address book. If the problem persists, contact your system administrator.

Communicator could not retrieve calendar or Out of Office information from Exchange Web Services. Communicator will automatically  continue to retry. If this problem persists, contact your  system administrator.

When I started troubleshooting the issue I also noticed that Read more »