Dynamics GP and CRM are the two most common Dynamics products in the U.S. which are sold together and setup in the same environment. Yet, most of the time, the discussion on the integration between these two systems is scheduled for a later time or in later phases of the project. It all depends on the requirements of the project. In my experience, having the integrations discussion early on resolves a lot of matters in terms of new processes and license costs. Any integration planned between these two systems requires planning and discussion between the different departments that plan on using it.