By default, the same localizable string is displayed in the collapsed group area for all groups. If your application requires the customization of the string that is displayed, the NavigationPaneCollapsedGroupAreaText can be set for all groups by setting the property at the control level (see GroupSettings), or for a specific group by setting the property at the group level (see Settings).
Note: This property is only applicable when the Style property is set to '3 - OutlookNavigationPane'.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2