http://blogs.msdn.com/b/michael_howard/archive/2004/06/16/157869.aspxDid you ever want to know which ports are used by the Cluster Service or Exchange? Well, there's a list available entitled, “Network Ports Used by Key Microsoft Server Products” at http://www.microsoft.com/smallbusiness/gtm/securityguidanceen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)