Using Outlook for iOS in business environments for email and scheduling
My issue was the Apple Mail link to Outlook/Hotmail. Microsoft made a change that no longer allowed me to see my Outlook/Hotmail on Apple Mail phone app. On an email announcing this change they offered solutions to re-establish the link. For Apple Mail app it is was go to settings, drill into accounts, delete the Outlook/Hotmail account and then add it back in using “Add Account” with Outlook/Hotmail email username and password. I did it and it worked. For other than Apple Mail they had other suggestions.