Add 'download to my calendar' button to the Activity when using the “Schedule a Follow Up” button. Either that or remove the button.

This is either a oversight or a very bad idea to not include the ability to add the activity to Outlook automatically. "Schedule a Follow Up" is a big friendly button placed right below the "+Add" button and yet if you use the former button you won't auto-add the activity to Outlook. It's therefore easy to miss a booked appointment.