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How to Recover OneNote Notebooks After a UPN Change or App Reset
Question details
The user needs to recover Microsoft OneNote notebooks that have disappeared or are returning a 404 error after their account's User Principal Name (UPN) was changed or the OneNote application was reset.
- Product
- Microsoft OneNote
- Device & OS
- not provided
- Scenario
- A user's UPN was recently modified by an IT administrator, or the OneNote app was reset to troubleshoot an issue.
- Observed behavior
- Notebooks are completely missing from the application, or attempting to open them results in a 404 error because the files are still tied to the previous account identity or file path.
Ensure you have your previous User Principal Name (UPN) and credentials handy, and verify that you have a stable internet connection. It is also recommended to have your IT administrator's contact information available in case backend account access is required.
Check Available Notebooks and the OneDrive Recycle Bin
Verify if the notebooks are still accessible in your OneDrive account or if they were accidentally removed during the application reset.
Open your web browser, navigate to the Microsoft OneDrive website, and sign in with your current Microsoft 365 credentials.
Click on 'My files' in the left-hand navigation pane and look for a folder named 'Notebooks' or 'OneNote Notebooks' to see if your files are still intact.
If the notebooks are missing, click on 'Recycle bin' in the left menu. Search for your missing notebooks here.
Select the missing notebook if you find it and click the 'Restore' button at the top of the page. Once restored, open OneNote and go to File > Open to reload the notebook.
Sign In Using Your Previous UPN
If the notebooks are tied to your old User Principal Name, temporarily signing in with the old credentials can re-establish the connection to your missing files.
Request IT Administrator Support
If local troubleshooting fails, your IT administrator will need to verify backend ownership and permissions or escalate the issue to Microsoft Support.
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Frequently Asked Questions
Why do I get a 404 error when opening a OneNote notebook after a UPN change?
A UPN (User Principal Name) change alters your account's primary cloud identity and the URL structure of your OneDrive. The 404 error occurs because OneNote is still trying to access the notebook using the old web address tied to your previous UPN, which no longer exists or fails to redirect.
Can I recover a OneNote notebook if my old account was deleted?
Yes, but time is critical. When a Microsoft 365 account is deleted, its OneDrive data (including OneNote notebooks) is retained for a default period, usually 30 days. Your IT administrator must restore the account or grant someone access to the deleted user's OneDrive to recover the notebooks before they are permanently purged.
How do I force OneNote to sync properly after my company changes my email address?
To force a proper sync after an email or UPN change, you should manually close the currently open notebooks in the app. Then, sign out of your account completely in OneNote, restart the application, sign back in with your new email address, and re-open the notebooks from the updated OneDrive location.
Will resetting the OneNote app delete my local un-synced notes?
Yes, resetting the OneNote app through Windows settings clears the local cache, which will permanently delete any notes that have not yet synced to the cloud. You should always manually back up un-synced pages by copying and pasting them into a local document before performing an app reset.
