As I was feeling, it was fixed a week after the launch iOS 11, he came and first update of the new operating system for iPhone, iPad si iPod Touch.
iOS 11.0.1 aims to solve some bugs and improve performance for the iPhone and iPad. Most likely it was solved the issue that occurred on shipment mail messages for users of Outlook.com or Exchange.
As far as we can see, the update targets primarily iPhone and iPad devices, but we also have the update available for 6's iPod touch generation, the only iOS 11-compliant model.
iOS 11.0.1 can be installed on iPhone 5S or new, iPad Air or new, via iTunes or Settings → General → software Update. (Wi-Fi connection and over 50% battery)iOS 11.0.1 - Fixing bugs and iOS for 11 for iPhone and iPad