If you have ever had issues with getting Outlook to open you will have found most them have to do with addins that are allowed but done always function. Recently I came across an issue that would not allow the user to open Outlook not even in safe mode or after a repair of Office. It would simply start trying to open Outlook and then display a window that would say “Cannot open the Outlook window error” After trying all that I could think of I found an article from Microsoft about resetting the “navpane”. Here is the simple step for reseting it for multiple versions of Windows.
Windows Vista and Windows 7
Start-> type; outlook.exe /resetnavpane
Start-> Run; outlook.exe /resetnavpane