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What is the OneNote Cache Folder and Is It Safe to Delete?

Kushani Nimanthika Oct 10, 2026 871 views

Question details

The user wants to understand the purpose of the OneNote cache folder and the potential risks or data loss associated with deleting it.

What Is the OneNote Cache Folder and Is It Safe to Delete?

Product: Microsoft OneNote
Device & OS: not provided
Scenario: Managing local storage or troubleshooting application issues by considering clearing the OneNote cache.
Observed behavior: The user needs clarification on how OneNote caches notebooks locally and whether clearing this cache will permanently delete their notes.

Before you start

Before making any changes to the cache folder, ensure all your OneNote notebooks are fully synchronized to OneDrive to prevent permanent data loss of offline edits.

Solution 1Recommended

How the OneNote Cache Works and How to Safely Clear It

Understand the consequences of deleting the cache and how to safely clear local notebook data by closing notebooks within the application.

The OneNote cache is essential as it stores a local copy of your open notebooks. When you make edits, these changes are initially stored in this local cache and then synchronized to OneDrive when a connection is available.

If you manually delete the cache folder while notebooks are unsynchronized, those local changes will be permanently lost. For fully synchronized notebooks, deleting the cache forces OneNote to close them, requiring a full download upon reopening.

Verify notebook synchronization status

Open Microsoft OneNote, right-click on the name of the notebook you are working on, and select 'Sync This Notebook' to ensure all recent changes are safely backed up to OneDrive.

Safely clear the cache for a specific notebook

Instead of deleting the entire cache folder in your system directories, right-click the notebook name in the OneNote interface and select 'Close This Notebook'. This action safely deletes the local cache for that specific notebook without risking data loss.

Reopen the notebook to rebuild the cache

If you need to access the notebook again, navigate to 'File' > 'Open' and select your notebook from OneDrive. OneNote will download a fresh copy and rebuild the cache automatically.

How the OneNote Cache Works and How to Safely Clear It

Application Exit vs. Notebook Closure: Simply clicking the 'X' in the upper-right corner to exit the OneNote application does not delete the cache. The cache is only removed automatically when you explicitly close the notebook from within the app.

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Frequently Asked Questions

Does closing the OneNote application delete the cache?

No, simply exiting the application by clicking the 'X' retains the cache so your notebooks load instantly the next time you open the program. You must right-click and select 'Close This Notebook' to clear its specific cache.

What happens if I delete the OneNote cache before syncing?

Any offline edits or changes that have not yet been uploaded to OneDrive will be permanently lost. The local cache is the only place these unsynchronized changes exist.

Is it safe to manually delete the cache if all my notebooks are synced?

Yes, but it is not recommended for routine maintenance. Deleting the cache acts as if you forced all notebooks to close. The next time you open OneNote, you will need to reconnect to OneDrive and wait for all notebook contents to re-download to rebuild the cache.

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