How to Open Older OneNote Notebooks in the New OneNote
Question details
The user needs to successfully open and view older OneNote notebooks in a newer version of the OneNote application without data loss.

- Product
- Microsoft OneNote
- Device & OS
- not provided
- Scenario
- Importing or opening notebooks created in older versions of OneNote (such as 2016 or earlier) into the latest OneNote application.
- Observed behavior
- The application returns an incorrect file type error, or the notebook successfully opens but contains missing pages.
Ensure you have access to the older OneNote 2016 desktop application to perform the conversion, and verify that your current notebook sections are fully synced to OneDrive to prevent accidental data loss.
Upgrade the Notebook Format via Notebook Properties
Use the built-in format conversion option within OneNote 2016 to upgrade the notebook file type to the modern standard.
Newer versions of OneNote only support notebooks saved in the 2010-2016 file format. If your notebook was created in OneNote 2007 or 2003, you must convert it using the older desktop application first.
Launch the OneNote 2016 desktop application and open the older notebook you wish to upgrade.
Right-click the name of the notebook in the left navigation bar and select 'Properties' from the context menu.
In the Notebook Properties dialog box, locate the 'Default Format' section. If it shows an older format, click the option to convert or upgrade to the 2010-2016 format.
Wait for the conversion to finish and sync, then launch your newer OneNote application and open the upgraded notebook.

Manually Transfer Content to a New Notebook
If the automated conversion fails or results in missing pages, manually copying sections is a reliable workaround.
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Frequently Asked Questions
Why do I get an 'incorrect file type' error when opening an old OneNote file?
This error occurs because newer versions of OneNote exclusively support the 2010-2016 file format. Notebooks created in OneNote 2007 or 2003 use an outdated architecture and must be manually converted using a legacy version of OneNote before they can be opened in modern apps.
Can I open local OneNote files directly in the OneNote for Windows 10 app?
No, the OneNote for Windows 10 app only supports cloud-based notebooks stored on OneDrive or SharePoint. To open local `.one` files, you must upload them to OneDrive first or use the standard OneNote desktop application.
What should I do if my OneNote notebook conversion is stuck?
If the conversion process hangs indefinitely, restart the application and check your internet connection. If it fails repeatedly, your best option is to create a new notebook in the modern format and manually copy the sections from the old notebook into the new one.




