Outlook is not opening? If your Microsoft Outlook will not open, there could a few reasons why. Outlook has a tendency to leave multiple processes running in the background, most of which are invisible to a computer user.
If one of these processes is already running, attempting to open Outlook again will not display anything. Outlook is actually running already, you just can not see it.
If you’re experiencing a problem with Outlook not opening, the following guidance will help you troubleshoot Outlook not starting.