Note: Class Notebook is already included with OneNote for Windows 10, OneNote for the web, and OneNote for Mac and iOS. These instructions only apply to users running Class Notebook on OneNote 2013 or 2016 who have previously downloaded the Class Notebook Add-in.
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Close OneNote.
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Open Start , and then type Programs and Features. Press Enter.
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Select Class Notebook Add-in for OneNote, and then select Uninstall.
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Confirm Uninstall.
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Select Close when the uninstall is complete.