This is a special alert only used in DeviceID authentication in Exchange ActiveSync and Outlook Anywhere.
When a DeviceID token is being deleted or disabled in the authentication server, by the administrator using the admin console, the authentication server will inform the DualShield IIS Agent running on the Exchange servers immediately so that the token will be also removed from the session cache in the IIS Agent. Otherwise, access from the device will still be allowed until the session has expired.