Outlook 2007 Error: “Cannot start Microsoft Office Outlook. Cannot open the Outlook window”

Here is the solution:

Start->run..then type the following -> "Outlook.exe /resetnavpane"

Source: http://social.answers.microsoft.com/Forums/en-US/vistaprograms/thread/baf53169-0514-4dd3-808f-d8437c898e67