This is the third video in a series that will take you step-by-step on building a Prism application that mimics Microsoft Outlook. In this video we will create the first module in the application called the Mail module. We concentrate on just stubbing out the module project, creating a module catalog, adding the Mail module to it in the bootstrapper. We also inject our first navigation view, in the form of an Infragistics OutlookBarGroup, into our OutlookBar region defined in our shell. We do this for both the WPF and Silverlight platforms.