I have Settings -> General -> Background App Refresh set to Off for all apps. But under Setttings -> Microsoft Outlook the Background App Refresh setting is enabled and grayed out and can't be changed, so I turned off Cellular Data for Outlook. I'm still getting notifications and updates from Outook. How and why is this possible with Cellular Data Off? I turned off Wi-Fi and Bluetooth. How can I stop Outlook from updating in the background? It's using up alot of battery. I've tried rebooting the phone but it didn't help.