Windows Communication Foundation and Windows Workflow Foundation follow different use case scenarios, but both share the fact that they are frameworks. Both WCF and Workflow are used as part of a custom-built solution. While some third-party vendors leverage and re-host these technologies, the use cases outlined here assume that these technologies are going to be used as the foundation of a new application. Use cases fit into one of these three categories: WCF, WF, and WF Services.
Windows Communication Foundation is striving to become the implementation framework of choice for distributed service-based scenarios. Examples include a company implementing a company-wide Service-Oriented Architecture (SOA) to offer enterprise services for tasks such as tax calculations, shipping quotes, or inventory checks. Using WCF is about approaching different distributed scenarios in a standardized way, increasing supportability, maintainability...