Onenote Container
This folder stores sandboxed app data for Microsoft OneNote on Mac, including local settings and content used by the app.
What is Onenote Container?
The folder ~/Library/Containers/com.microsoft.onenote.mac is the sandbox container used by Microsoft OneNote for Mac. App containers on macOS hold data the app needs to run within Apple's sandbox model, such as settings, temporary working files, and app-specific documents or synced notebook data references. People usually encounter this folder when reviewing storage use, troubleshooting OneNote, or checking what remains after uninstalling Microsoft Office or OneNote.
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Safety overview
Status: Use with caution
This is not a system folder, but it may contain important OneNote app data, settings, sign-in state, and locally stored notebook information. Deleting it can reset the app and may remove unsynced local data.
Recommendation: Keep this folder if you still use Microsoft OneNote or if you need to preserve its local data. If OneNote has been uninstalled and you no longer need any local notebooks, settings, or sign-in data, it is usually reasonable to remove this folder after confirming your notes are fully synced or backed up.
File path
~/Library/Containers/com.microsoft.onenote.mac
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