If you go through all of those steps and Outlook is still crashing or not responding, complete step 4 before contacting the Microsoft Community for further help. To narrow it down, enable each add-in one by one, restarting Outlook after enabling each add-in. You need to repeat this process until you identify the add-in that causes Outlook to crash. Once you find it, remove it from Outlook by selecting it and then clicking the “Remove” button. Is the classic Outlook email client crashing when you create or open a new email?

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