One of my users just reported this. When the preview comes up or when you open the email you get this box, several times. It sits there for a long time and will sometimes let you continue, but other times Outlook will crash.
Has anyone else seen this? Do you know of a fix?
I just did a little searching and found a post from 2012 about this, but without a real solution.
http://dilijev-cs371p.blogspot.com/2012/10/outlook-crashes-from-new-google.html