Salesforce Outlook Integration Debugging Tools
  1. Right click "Download Outlook manifest" button below, and click "Copy Link Address"
  2. In the Settings area of Outlook, click "Manage add-ins".
  3. Click "Add a custom add-in" and select "Add from a URL".
  4. Click the + icon and "Add from a URL"
  5. Paste the URL

https://sfdc-addin-tools.herokuapp.com/manifest
Download Outlook manifest
v2021.04.01