How can a Silverlight application connect to an existing WCF service?

You don't need to enable OData; as long as the endpoint in your existing service uses a binding which is compatible with Silverlight (for example, BasicHttpBinding), the SL app will be able to consume it just as well as the WPF one. If the binding is not compatible, you can add a new endpoint to the service (yes, it can be in the same IIS application) which can be used by the SL application.

The best information is found on this MSDN article: Accessing Web Services in Silverlight.

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