1)   VLButtonBar 3.0
Add outlook sidebar style navigation in your applications with VLButtonBar control. Use this control as vertical menu, VB styled toolbox. Supports unicode for button and group captions. Offers great looking buttons with gradient filled background.

 2)   Xceed SmartUI 2.0
Xceed SmartUI provides VB6 developers with a framework of visual controls for building rich user interfaces. Includes Menus, ToolBars, TreeViews, OutlookBars, StatusBars, PropertyLists and more all based on an ultra-flexible, reusable core control.

 3)   KNOCKS WinControls Suite 1.0.1.2
Outlook Grid, Spellchecker, Docking Manager, Daily Calendar, Monthly Calendar, Schedular, Office 2007 Tooltip, Outlook bar, TabControl .NET