The BlackBerry Enterprise Server (BES) product supports both OCS 2005 and 2007 versions, but uses the Communicator Web Access (CWA) component of the solution, so this feature needs to be installed on the OCS server itself.

Verify that the CWA web site can be accessed from the browser on the BES server, ensuring that DNS is correctly configured and installing any SSL certificates if required:

And verify that a sample user account is able to log in via the browser:

The CWA web site itself should be enabled for Forms-based authentication: which is the default configuration, as well as Integrated Windows Authentication:

Run the BES installation wizard. Whether this is a clean install, or you're adding the instant messaging functionality to an existing installation, the first screen will prompt you to select your Instant Messaging platform:

NOTE - if this is an existing installation, you should run the installer as the same user account that was used to first install the solution originally (ie the BesAdmin account).

Select the appropriate version of OCS. Run through the rest of the installation steps - for detailed information on how to install the BES solution from scratch, visit the BlackBerry section of the blog (http://blog.brightpointuk.co.uk/blackberry). Even on an existing installation you will be prompted to run through all installation steps and reboot the server.
Following a reboot the installation will resume and you will be prompted to enter in the address of the Communicator Web Access server:

Enter in the server address minus the /cwa suffix, so if your CWA login address is https://ocsweb.domain.com/cwa just enter 'ocsweb.domain.com'

Specify whether the server is accessed via HTTP or HTTPS and enter the port number if not using the standard 80 or 443 ports.

Complete the installation. When finished, within the list of BlackBerry services will be one named 'BlackBerry Collaboration Service', ensure that it has started successfully:

Setting up BlackBerry Smartphone devices

The BES is now configured. In order to use the BlackBerry device, you will first need to ensure that the BlackBerry Instant Messaging (BBIM) service book is present on the device.
To do this, on the device itself browse to Menu --> Options --> Advanced Options --> Service Books and ensure that BBIM is listed. If not, it may be necessary to re-send services books from the BES within the BlackBerry Manager.

Next, the OCS client software itself will need to be installed onto the handheld. One way of doing this is to use the BlackBerry Desktop Manager application.
The OCS client software can be downloaded from the BlackBerry web site - http://na.blackberry.com/eng/support/downloads/im.jsp

Download the file to your PC and extract the contents. The BlackBerry Desktop Manager software can be downloaded from the BlackBerry web site here - https://www.blackberry.com/Downloads/entry.do?code=A8BAA56554F96369AB93E...

Once installed, connect the BlackBerry to your PC and launch the Desktop Manager application. If prompted to select an Outlook profile, simply press Cancel. The following window will be displayed:

Click on the Application Loader and select the option to Add/Remove Applications.
The wizard will read details from the device about installed software, this process may take a few minutes. When prompted, click on the option to Browse and navigate to where you saved the extracted OCS client:

Select the OfficeCommunicator2007.alx file and click Open.
Tick the option to Install ‘Enterprise Messenger’ and click Next. The software will then be installed onto the device. When complete you can disconnect the device from the PC.

On the device itself, in the main menu should now be a folder called ‘Instant Messaging’:

Within this folder will be an icon for Enterprise Messenger:

Tap the icon to launch the OCS client:

You can now sign in using your domain username and password. If you have any contacts saved to your address book already, they will be displayed together with their status:

Once logged in, your status will also be updated:

You are now connected to the OCS server from your BlackBerry.