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The second line within the example will open the DefaultMailBoxConfigurationView. This is a shortcut to navigate to a well known navigation page which is included within antony by default. It is highly recommended to use these shortcuts. You can see the available shortcuts within the IClientConfigurationServiceExtensions
class defined within the ExtensionInterfaces
Conclusion
With the described interface it is possible to open a configuration window. It can be used within the specific use-cases within your module. For example “You cannot use my cool feature, as you dont have a configured default mailbox. Do you want to open the settings?”. This may your module becomes more user friendly.