Starting yesterday evening, I haven't been able use my Mail app on my iPhone 5S. I have updated to 7.0.6 but this problem didn't arise immediately after updating my phone. At first it would open, showing me email inside the last folder I was looking in and the moment I tried to leave that folder to see a different one, it would crash by just disappearing. Now, the moment I open the app it disappears. I have tried closing the app, soft resetting my phone and tried turning off my phone completely and back on. No luck. If it were a third party app, I would try reinstalling it. Do I really have to restore my phone for this?