The Microsoft Support and Recovery Assistant can diagnose and fix several Outlook issues for you, including fixing your Outlook profile. To download and install the Microsoft Support and Recovery Assistant, click download the tool. Once installed, the application will run automatically.
1. In Outlook 2010, Outlook 2013, or Outlook 2016, choose File.
2. Choose Account Settings > Account Settings.
3. On the Email tab, choose your account (profile), and then choose Repair.
Note: The Repair option is not available if you are using Outlook 2016 to connect to an Exchange account.
4. Follow the prompts in the wizard, and when you are done, restart Outlook.

Outlook connection still not working?
i. Run Windows Update to make sure you have the latest updates for Outlook and other desktop apps for Microsoft 365.
ii. Download and run the Microsoft Support and Recovery Assistant.

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