Update OneNote to the latest version to ensure seamless and secure sync due to infrastructure upgrades completed in June 2025. Users on older versions may experience sync issues. Refer to the Microsoft Support article for troubleshooting. All OneNote platforms are affected. Contact Microsoft support for further assistance.
As previously announced in MC1035701 (March '25), we're upgrading OneNote's sync infrastructure to deliver improved security, performance, and reliability across all supported platforms — including OneNote for Windows, Mac, iOS, Android, and OneNote for Windows 10. To benefit from these enhancements, users must be on the latest version of OneNote.
When this will happen:
The rollout completed at the end of June 2025
How this affects your organization:
Users on older versions of OneNote may experience sync interruptions, including:
These issues will persist until users update their apps or click the “Refresh” prompt. This behavior is expected as we transition to the new sync infrastructure.
What you can do to prepare:
| Build Version | Sync Behavior |
| ≥ 2410 (Oct 2024) | Seamless automatic transition |
| ≥ 2403 (Mar 2024) | Notebooks may open read-only with refresh prompts |
| ≥ 2211 (Nov 2022) | Editing allowed, but users will see a refresh Infobar |
| < 2211 Sync error (E000006C) | Update required to resume syncing |
Refer affected users to the following Microsoft Support article for troubleshooting guidance Fix issues when you can't sync OneNote.
Impacted platforms: All OneNote platforms are affected:
For additional support, contact your Microsoft support team or use Help > Support within OneNote on Windows.