since v10.0.132

The extension point MessageTabProvider is a java interface that can be implemented to display and provide content for an alternative message tab, replacing the default message tab in the mail info area of the novomind iAGENT Supervisor and Agent frontends.

Your plugin has to return an object of type MessageTab. The MessageTab specifies a label for the tab to be displayed and a URL for the tab's content. The URL can be the path to a custom JSF xhtml file included in your plugin. The path has to be specified as a relative path inside the META-INF/views directory of your plugin jar file.