Outlook is one of the widely used application across the globe with great features but sometimes you get the error message of #Outlookdisconnected. You will not be able to send or receive emails due to the issue. The reason #whyOutlookwontopen is due to corrupt navigation pane. Another cause of the problem is running Outlook in compatibility mode or corrupt data files. You can try some of the troubleshooting steps if #Outlookwontopen.