Here is a quick fix to what can be a really frustrating problem.
If when trying to open Microsoft Outlook at you are faced with the “Cannot start Microsoft Office Outlook. Unable to open the Outlook window” error you simply need to go to Start > Run (or hold down the Windows Key and press R on the keyboard) and type in ‘Outlook.exe /resetnavpane’.
Outlook should now open!
I hope this saves someone some grey hairs.