Outlook.com for Android - Turn off audio notifications
The Outlook.com app for Android will emit a small audio notification each time you receive an email. To disable this feature:
Launch the Outlook.com app.
Tap on the Menu button (3 vertical dots) > Settings.
Go to "General" settings.
Tap on "Notifications"
Tap on "Email Notifications".
Uncheck "Message Notification".
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