Office 365 (Outlook for iOS) - Set or remove event reminders
This document explains how to edit the alert reminders for an event in Outlook for iOS
1. In the main calendar view, tap the Add Event button at the top-right corner of the screen.
2. A new event will open, tap Alerts near the bottom of the screen.
3. Here, you can choose from a number of alert settings, as well as turn off the alert.