To help Outlook Mobile and your device run better, you can clear space on your Android device. This space is used for storing data like music, photos, and apps.
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Open your device's Settings app.
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Tap Storage.
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Tap a category.
Some suggestions:
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Move pictures to a computer or cloud service and delete the copy from device.
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Uninstall apps that you are no longer using.
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Remove music and other files that you are no longer using such as videos.