Ever since I upgraded to iOS 7 my email shows I have unread messages. The number keeps climbing and will not disappear. This's happens when I read emails on my blackberry or PC and for some reason iPad doesn't recognize that I've already read it or even deleted it. Ironically, this happens with my blackberry when I read something on my iPad first (stupid blackberry) but it never happened on my iPad when I was using iOS 6, only after I upgraded. I have shut it down, deleted the email, added back email etc and nothing seems to help. Any advice?