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You can turn off sound notifications in Outlook for MacOS by completing the following steps.
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- Click on Outlook in the menu bar
- Click on Preferences...
- Choose Notifications & Sounds
- Under the "Sounds" section, uncheck the box(es) next to each item you want to not hear a sound for.
- If you prefer to hear a sound, you can check a box to turn sounds on and even play around with the type of sound that is played, if desired.
- Close the window when complete. It will automatically save your settings