Installing an Office 365 add-in is as simple as pasting some text into a form.   

  1. In your Outlook client - open the Microsoft Store
  2. Select 'My add-ins' >> Add a custom add-in >> Add from URL
  3. Paste the URL into the box:    https://cv1.corporate-contacts.com/wwwroot/chimpview1.xml
  4. Accept the pop up warnings and your installation is complete