When using the WP7Contrib packages from nuget.org you will be using the release build versions of the assemblies. Unfortunately what you won't get is the debug information generated by the services and other classes in the contrib. What is detailed below is steps you can use to get this debug information when using the packages. I am aware NuGet now supports the publication of PDBs & symbols to symbolsource.org (more info can be found here ). We haven't yet got round to factoring this into our publication process. When I say process, I mean when I use NuGet Package Explorer to do the publish to NuGet. I'm not sure the explorer currently supports this feature (hopefully I'm wrong). When this is done you'll be able to step through the contrib code base. We also provide another way to get debug information at runtime via the ILog interface. The caching, communications & services namespaces make use of this interface. Like all dependen...