For a connection between the BlackBerry Enterprise Server and OCS2007 we need to install BES 4.1 Service Pack 6 and choose to install the BlackBerry Collaboration Service and select Microsoft Office Communications Server 2007 during the installation of SP6.
Some prerequisites are that Message queing is installed on the Windows 2003 SP1 or higher. Office Communicator Web Access is required. Enhanced Presence needs to be turned on in OCS. Windows authentication should be used in IIS. Form based authentication is not supported.
You need to install OC client 2.1.10c on the BlackBerry Smartphone.

Choose to install the BlackBerry Collaboration Service and select Microsoft Office Communications Server 2007
Fill in the OCWA host and choose for HTTPS and HTTP. HTTPS is recommended both for security and stability of the connection. When HTTP is choosen the collaboration service will open up 3 concurrent connections, where HTTPS will open up only 1 concurrent connection.

Look at the final screen of the SP6 installation. We now have a BlackBerry Collaboration Service installed!
If you ever would like to change the OCWA hostname or change HTTP to HTTPS, then go to the BlackBerry Server Configuration panel and go to the Collaboration Service tab.
Now the BES is all setup for the OCS 2007 connection let’s try to log on to the communicator client on the BlackBerry.
Fill in the correct credentials and sign in.
![clip_image001[4] clip_image001[4]](http://lh5.ggpht.com/joachimfarla/SJdv5TQEzqI/AAAAAAAAB0I/ZV_-6F_TwvA/clip_image001%5B4%5D_thumb.gif?imgmax=800)
The client is connecting

We’re connected to OCS!

Now let’s chat with someone.

Let’s look at the other options available during a conversation.

And some more options for example call the person you are chatting with..
Specials thanks to my colleague Robert Nijbroek who work for the BlackBerry support team at e-office. All credits to his work for writing this article. Connect with him at linkedin!