Adding Custom Text to the Instant Messaging Pane
You can add a text message that appears in the instant messaging pane of the Conversation window every time an instant messaging session starts, as shown in Figure 5.
To do this, use the IMWarning policy key under HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Communicator. This policy can also be set in HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Communicator, but settings in HKEY_LOCAL_MACHINE take precedence.
Figure 5. Custom text in the instant messaging pane