The following are some of the main features of C1OutlookBar that you may find useful:   

• Microsoft Outlook-style UI
  Group content and navigation menus into distinct categories just like the navigation system used in Microsoft Outlook 2007 and 2010. This model helps you organize content and allows end-users to navigate quickly.
• Office 2007 and 2010 Themes
  C1OutlookBar supports several different Office 2007 and 2010 themes including blue, black and silver. These themes work just like standard Silverlight themes. See the Themes topic of this documentation for more information.
• Expand/Collapse
  Enable the C1OutlookBar control to collapse to the left or right of the page. See Expanding and Collapsing C1OutlookBar for more information.
• Stackable Buttons
  Use the splitter bar to stack buttons into the collapsed item panel located at the bottom of the control. When buttons overflow they will appear in the drop-down menu for selection.
• Flexible Data Binding
  C1OutlookBar is an ItemsControl that can be bound to any list of objects of any data type using DataTemplates to create a visual representation of the items. See the Adding an Image to a C1OutlookItem topic for an example.
• Easily Change Colors with ClearStyle
  C1OutlookBar supports ComponentOne ClearStyle technology which allows you to easily change control brushes without having to override templates. By just setting a few brush properties in Visual Studio you can quickly style each part of the accordion. See OutlookBar ClearStyle Properties for more information on the ClearStyle technology.