There are many Outlook style menus, hope this helps:
Outlook Style Menu With Collapse Side Menu
http://www.codeproject.com/KB/aspnet/Outlook_Style_Menu.aspx
Outlook Style Menu
http://www.obout.com/sm3/outlook.aspx
COOLjsOutlookBar Demos
http://javascript.cooldev.com/scripts/outlook/demos/
Outlook Style Menu with Collapsable Side Menu
http://www.c-sharpcorner.com/UploadFile/ysaad/OutlookStyleMenu08242006033045AM/OutlookStyleMenu.aspx
ASP.NET Outlook Style Menu
http://www.logicwebsolutions.com/blogs/2006/07/aspnet_outlook_style_menu.html
Silverlight Menu (or ToolBar) and Outlook Style Navigation Bar
http://community.devexpress.com/blogs/thinking/archive/2008/07/09/silverlight-menu-or-toolbar-and-outlook-style-navigation-bar.aspx
VertMenu - Outlook-Style Menu Bar
http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=14855&lngWId=1
Outlook style Web Panel Bar
http://www.codeproject.com/KB/custom-controls/ecoolwebpanelbar.aspx