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I’m building Silverlight applicaitions using Prism and MVVM.
When calling WCF services on your own server, or even external webservices like the Bing api, would this be done from the Model? or from the ViewModel, thus making the service the Model?
Yes. The View should only manage the transformation of data into user interface elements, the Controller should only orchestrate the interaction between views and model, and the remaining (business logic and data access, this one including calls to remote services) should be in the Model.