If this property is not set then the Application Styling framework will look at the InboxControlStyler.DefaultStyleLibraryName property on the InboxControlStyler.
If that property is not set, the the Application Styling framework will use the default style library specified for the application.
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