To help Outlook Mobile and your device run better, you can clear space on your iOS device. This is space is used for storing data, like music and other apps.
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Open your device's Settings app.
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Tap General.
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Tap iPad/iPhone storage.
Some suggestions:
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Save pictures on 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.
