Windows Communication Foundation (WCF) is a feature of Windows Server® 2008.
It can be activated by using the Server Manager's "Add Features Wizard". The Server Manager is a Microsoft Management Console plug-in found in the Control Panel. Use WCF as part of the Application Server Role for deployment of a Web Services application. See the Application Server Role documentation for information.
The following dialog shows the "Add Feature Wizard" dialog in Server Manager used to activate WCF. See the highlighted item.