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How to Fix OneNote Sync Conflicts, Missing Notes, and Save Errors

Maira Mehtab Sep 22, 2026 869 views

Question details

Users are experiencing persistent synchronization issues in Microsoft OneNote, resulting in conflicting pages, unsaved work, and lost notes.

Product: Microsoft OneNote
Device & OS: not provided
Scenario: Syncing notebooks to the cloud, even when not collaborating with other users.
Observed behavior: OneNote displays conflicting pages and save errors. Additionally, notes may disappear completely after the notebook is closed and reopened.

Before you start

Before attempting any fixes, manually copy your currently unsaved or conflicting notes and paste them into a separate text document like Notepad or Microsoft Word to prevent permanent data loss during the troubleshooting process.

Solution 1Recommended

Clear OneNote Cache and Force Re-sync from the Web

This is the most effective method for resolving persistent sync conflicts by safely resetting the local app state and fetching a fresh copy from the cloud.

Sync conflicts and save errors often occur due to a corrupted local cache. By clearing this cache and reopening the notebook from OneNote Online, you force the application to download the most recent, uncorrupted version of your notes.

Close the Affected Notebook

In the OneNote desktop application, right-click the name of the notebook experiencing sync issues and select 'Close This Notebook'.

Sign Out of OneNote

Navigate to 'File' > 'Account' and click 'Sign Out' under your User Information to sever the active connection.

Clear the Local Cache

Close OneNote entirely. Press Windows Key + R, type '%localappdata%\Microsoft\OneNote', press Enter, and delete the contents of the 'cache' folder for your respective version.

Reopen from OneNote Online

Open a web browser, log into OneNote Online, locate your notebook, and click 'Open in Desktop App'. Wait for the initial synchronization to complete fully before making any new edits.

Important: Make absolutely sure you have backed up any unsaved notes locally before closing the notebook, as un-synced data will be permanently deleted during this process.

Solution 2

Repair or Reinstall Microsoft Office

Use this solution if clearing the cache does not resolve the issue, which suggests the core application files might be corrupted or outdated.

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Frequently Asked Questions

Why does OneNote show sync conflicts when I am not collaborating with anyone?

This typically occurs if you edit notes on multiple devices while offline, or if a previous background sync session was interrupted. OneNote creates a conflict page when it receives multiple differing data updates for the exact same page, even from a single user account.

Can I recover notes that disappeared after closing a OneNote notebook?

You can try looking in the 'Deleted Notes' section under the 'View' tab, or check the 'Misplaced Sections' at the bottom of your notebook list. However, if the notes never successfully synced to the cloud server, they may be permanently lost once the notebook is closed.

How do I force OneNote to sync immediately?

You can right-click on the specific notebook name in your notebook list and select 'Sync This Notebook Now', or simply press Shift+F9 on your keyboard to force a manual synchronization of the active notebook.

Where is the OneNote cache folder located on a Windows PC?

The cache is typically located at 'C:\Users\[YourUsername]\AppData\Local\Microsoft\OneNote\[Version]\cache'. You must ensure the OneNote application is completely closed before attempting to delete or modify any files in this folder.

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