Using New Outlook on Windows for personal email, calendar, and contact management
I was looking for a solution to create events based on emails. I read your post and tried to drag it to the calendar, which immediately created an event!
I have the "Calendar" and "To Do" side panes activated (called "My Day" on the "View" ribbon). So I dragged the Email to the Calendar, and it worked perfectly.
Hope this helps!
P.S. Also, Ctrl+C on the email and after Ctrl+V on the calendar event will attach the email.