Outlook Error: Runtime.InteropServices.COMException (0x80020009)

Reason
Unknown error message from Outlook API (not as such unknown but Outlooks 'something went wrong' error message)

Solution
Search 'Outlook Runtime.InteropServices.COMException (0x80020009)' to see the various fixes for this issue

Still not working?
In many cases, these errors can also be due to a corrupt Office installation. If above did not work we recommend you try and repair the Office installation under Program and Features