https://contactforhelp.com/blog/things-to-do-when-outlook-wont-open/ Outlook is one of the most used application across the globe. But sometimes due to issues you find, #Outlookwontopen. It can happen due to internet connectivity issues. It won’t open if you are using Outlook in compatibility mode. Another reason #whyOutlookwontopenonMac is that the files are deleted. Let’s see how you can resolve the issue. Disable the add ins. Repair the damages files. Create a new profile and login through that. Make sure that #Outlookisnotrunning in compatibility mode. If you find Outlook disconnected, go to the browser history and clear the cache.