I am experiencing a mildly infuriating issue with Outlook 2013. When I receive an email, if I click the alert box that pops up to open the email and reply to it from that window, the message gets marked unread when I actually send the reply. It is driving me crazy.
I think it has to do with the "Mark Unread" button. When I click the alert box, that button is already "on". I don't know why that would be.
See attached screenshot.