Sometimes the emails on my iPhone/iPad Mini come in as read. I hear the notification, but the notification immediately disappears or doesn't show up at all. And no, it's not open in a browser or elsewhere. I'm not hacked and just changed my password to some stupidly complicated crap about a month ago. This isn't too much of an issue if I feel or hear the notification, but if I don't, sometimes it just sits there for hours before I see it. I am running iOS 7 on my iPhone (GM edition, haven't gotten the OTA yet) but 6.1.3 on my Mini. So I know it's not an issue with the version of iOS necessarily. I'm not JB on either device. Using Outlook.com account.