OneDrive File Issues

How to Fix OneNote for Windows 10 Sync Error with Microsoft 365 Storage

Natalie Taylor Oct 22, 2026 868 views

Question details

Users are unable to synchronize OneNote for Windows 10 notebooks because the application incorrectly reports that the Microsoft 365 storage account is full, despite having ample available space.

Fixing OneNote for Windows 10 Sync Errors When Microsoft 365 Storage is Not Full

Product: OneNote for Windows 10
Device & OS: Windows 10
Scenario: Attempting to sync OneNote notebooks to Microsoft 365 OneDrive with a large amount of available cloud storage.
Observed behavior: OneNote fails to sync and displays a storage full error, failing to recognize the actual available storage space in the Microsoft 365 account.

Before you start

Ensure your computer has an active internet connection and verify your Microsoft 365 subscription status online to confirm your OneDrive storage limit hasn't actually been reached.

Solution 1Recommended

Verify on OneNote Web and Clear Local Cache

By confirming the notebook works online and clearing the local cache, you can force OneNote to re-establish a fresh connection to your OneDrive storage.

OneNote relies on a local cache to function offline. If this cache becomes corrupted or if your local hard drive is full, OneNote may throw a misleading storage error even if your cloud storage has plenty of space.

Open OneNote for the web

Go to onenote.com, sign in with your Microsoft account, and check if your notebooks open and sync correctly in the browser.

Check Local Disk Space

Open File Explorer and check your C: drive. Ensure you have at least several gigabytes of free space available for OneNote's local cache.

Close OneNote

Completely close the OneNote for Windows 10 application on your computer.

Clear the Cache

Press Windows Key + R, type '%localappdata%\Packages\Microsoft.Office.OneNote_8wekyb3d8bbwe\LocalState\AppData\Local\OneNote', and delete the cache folder contents. (Note: Backup unsynced notes manually first).

Restart and Sync

Reopen OneNote and manually initiate a sync for your notebooks.

Verify on OneNote Web and Clear Local Cache

Backup Unsynced Notes: If you have notes in the desktop app that haven't synced to the web, copy and paste them into a Word document or Notepad before clearing the cache, or they will be lost.

Solution 2

Reset OneDrive and Install Office Updates

Resetting the OneDrive client and updating Office can resolve underlying authentication and connection bugs causing the false storage error.

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Frequently Asked Questions

Why does OneNote say my storage is full when I have 1TB of Microsoft 365 space?

This usually happens when your local computer's hard drive is out of space for OneNote's local cache, or the application is failing to authenticate correctly with the specific OneDrive account linked to your 1TB subscription.

Will clearing the OneNote cache delete my notebooks?

It will not delete notes that have already successfully synced to OneDrive. However, any recent changes that haven't synced yet will be lost. Always back up unsynced notes manually before clearing the cache.

How do I manually sync a notebook in OneNote for Windows 10?

Right-click the name of the notebook in the navigation pane, select 'Sync', and then click 'Sync This Notebook' to force the application to connect to the cloud.

Is OneNote for Windows 10 different from the OneNote desktop app?

Yes, OneNote for Windows 10 is a UWP (Universal Windows Platform) app installed via the Microsoft Store, which handles syncing and caching slightly differently than the traditional OneNote desktop application included in Microsoft 365.

Document & File Issues