You can install Communicator Web Access snap-in and Office Communications Server administrative tools from the command prompt by running the file AdminTools.msi.
To install Communicator Web Access snap-in from the command line
Log on to the computer where you want to install Communicator Web Access snap-in as a member of both the local Administrators group and the Domain Admins group.
Click Start, and then click Run.
In the Rundialog box, type cmd, and then click OK.
At the command prompt, navigate to the Setup folder on the Office Communications Server 2007 R2 CD and then press ENTER. For example, if your CD drive is drive F type the following:
Type the following command to install the Communicator Web Access snap-in:
If you would like to create a log file for the installation process then add the /lvswitch followed by the file path for the log file. For example, to save a log file as C:\Logs\CWA_Install.txt use the following command:
AdminTools.msi /lv c:\logs\cwa_install.txt