Thanks again for taking the time to look at this
I have done all of the points suggested and there is no change. I can see the Evernote button in the toolbar in Outlook, I can click on it and it brings up the form for saving to Evernote. The problem is the fields (Notebook and Tag) are empty and not populating. As a result the save button remains inactive and cannot be clicked to save the email to Evernote.