If you need to control/prevent WS2K8 server communication to the internet, you need the
splogscreen: if you are reading this on a site other than http://blogs.technet.com/tonyso, come on over for a look at the original posting site.
This white paper provides information about how to limit, control, or prevent WS2K8 server internet communication, such as browser and e-mail technologies, but also automatic updating that help you obtain the latest software and product information, including bug fixes and security patches.
You may also be interested in the Vista paper: Using Windows Vista: Controlling Communication with the Internet