>>We also have our services set up that we can run them as console apps also if there is a problem to solve. Debugging is much easier that way as you have full debugging.
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>When you run into such situation, do you simply change the Windows Service configuration to interact with desktop?

Yep... on the project we set it back to windows console app (recompile the app) and we have two constructors in the main service class. We comment out the windows service constructor and run under the console app constructor...