Microsoft releases updates to Outlook for the current iOS operating system and the immediately previous version of the iOS operating system. With the recent release of iOS 11 for iPhone, iPad, and iPod Touch, devices running iOS9 will no longer receive updated versions of the Outlook App. Please update your device to the latest version of the iOS it will support. If your device does not support iOS versions greater than 9, Outlook should still be available via Safari at https://portal.office.com