O
- Ocarina, How to Find Good Apps
- oleophobic screen, Screen
- on/off switch, Sleep Switch (On/Off)–The Lock Screen, Sleep Switch (On/Off), The Lock Screen
- opening, Control Center–Responding to Notifications, Responding to Notifications, What to Say to Siri, Firing Up the Camera, Settings
- camera, Firing Up the Camera
- Control Center, Control Center–Responding to Notifications, Responding to Notifications
- Settings app, Settings
- using Siri to open apps, What to Say to Siri
- optimizing iPhone storage, iCloud Photo Library
- Outlook, Email–Free Email Accounts, Free Email Accounts, The Perks, Life on the Corporate Network–Invitations, Invitations, Invitations
- calendar invitations, Life on the Corporate Network–Invitations, Invitations, Invitations
- Outlook Web Access (OWA), The Perks
- setting up email account, Email–Free Email Accounts, Free Email Accounts
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