OneNote not syncing means the notes you typed on one device never show up on another — a page you wrote on your laptop is missing from your phone, edits sit there with a little sync error icon, or a whole notebook refuses to update. Because OneNote keeps a local copy of your notebooks, you usually do not lose anything; the content is safe, it is just stuck. The job is to get the connection between your device and the cloud working again, and that comes down to a handful of specific causes.
This guide works through them in the order worth trying, starting with the quick checks that resolve most cases and moving to the deeper fixes for a notebook that stays stubbornly out of sync.
Confirm you are actually online and signed in
It sounds obvious, but the most common reason OneNote is not syncing is a quiet break in the connection to your Microsoft account rather than anything wrong with OneNote itself. Two things to verify before anything else:
- Your internet connection is working. Open a website to confirm. OneNote can appear “stuck” when the device has dropped to a captive Wi-Fi portal or a connection that is technically connected but not passing traffic.
- You are signed in with the right account. Go to File > Account and check the email shown. If you have both a personal and a work or school account, a notebook created under one will not sync while you are signed in under the other. This single mismatch causes a lot of “missing notebook” confusion.
If the account shows a “needs attention” or sign-in prompt, sign out and back in. That re-establishes the token OneNote uses to talk to the cloud and resolves a large share of sync failures on its own.
Check OneNote’s sync status for the real error
OneNote will tell you what is wrong if you ask it. Go to File > Info > View Sync Status (or right-click any notebook and choose Notebook Sync Status). This opens a panel listing every notebook and whether each is syncing, up to date, or erroring.
The value here is that it pinpoints the problem. If one notebook is failing while the rest sync fine, the issue is that specific notebook, not your account or connection — which saves you from resetting things that were never broken. Note the error code or message shown next to the failing notebook; it guides which of the fixes below applies.
The notebook is stored in the wrong place
OneNote only syncs notebooks that live in the cloud — on OneDrive or SharePoint. A notebook saved to a local folder on your PC cannot sync anywhere, because there is no cloud copy to sync to. This trips people up after moving from older versions of OneNote that allowed local notebooks.
To check, look at the notebook’s location in File > Info. If the path points to a local drive rather than a OneDrive or SharePoint location, that is your answer. The fix is to move the notebook to the cloud: in OneNote, use the option to share or move the notebook to OneDrive, which uploads it and switches syncing on. Once it lives in the cloud, it will sync across your devices normally.
A single page or section is blocking the sync
Sometimes the whole notebook stalls because of one problem page — often one with a very large embedded file, a corrupted image, or a printout that failed to upload. OneNote tries to sync everything as a unit, so one stuck item can hold up the rest.
To isolate it:
- Open the sync status panel and note which section reports the error.
- Go to that section and look for a page with a large attachment or an image that will not load.
- Try moving recent or suspect pages to a new section, then sync. If the rest of the notebook syncs once a particular page is moved out, you have found the culprit.
- For an oversized attachment, save the file separately, delete it from the page, and sync — then re-add it in a smaller form if needed.
OneNote has a per-file size limit for what it will sync, so a large attached video or dataset is a frequent cause of a section that refuses to update.
Clearing the OneNote cache
OneNote keeps a local cache of your notebooks, and when that cache becomes corrupted, sync can fail even though everything else is correct. Clearing it forces OneNote to rebuild the cache from the cloud copy. Because your notes live in the cloud, this is safe for anything already synced — but any change that had not yet synced lives only in that cache, so make sure your unsynced edits are backed up first if the notebook shows pending changes.
The cleanest way is to fully sign out of OneNote, close it completely, and sign back in, which prompts a fresh download. If problems persist, the cache folder itself can be cleared while OneNote is closed, after which OneNote rebuilds it on next launch. This resolves the class of sync errors that survive every other fix.
The desktop app versus the store app
There are two OneNote apps on Windows that have historically coexisted: the desktop app that comes with Microsoft 365, and the Windows app. Running both, or having an outdated version, can produce odd sync behaviour where one app shows current notes and the other does not. Microsoft has been consolidating these into a single OneNote app, so the fix is to make sure you are on the current version and not splitting your attention between two installs.
Check for updates: in the desktop app, File > Account > Update Options > Update Now. An out-of-date OneNote is a genuine and easily missed cause of sync trouble, because server-side changes sometimes leave older clients unable to sync correctly.
Server-side outages and limits
Not every sync failure is on your end. If OneNote will not sync across every device at once and you have ruled out your account and connection, the Microsoft 365 service itself may be having a problem. Microsoft publishes service status, and a brief outage will resolve itself without you changing anything — so it is worth checking before you start resetting caches. You can confirm current service health on the official Microsoft status resources.
There is also a storage angle: OneNote notebooks count against your OneDrive storage. If your OneDrive is full, new content cannot sync up. Check your storage quota if syncing stopped suddenly and you have been adding large files.
Common OneNote sync error codes explained
If the sync status panel shows a specific code, it narrows the cause considerably. The ones you are most likely to see:
- A “section cannot be synced” / 0xE000005E-type message usually points to a problem with that one section — a corrupted page or oversized attachment. Isolate the section as described above rather than resetting the whole notebook.
- An account or authentication error (0xE0000007 and similar) means OneNote cannot prove who you are to the server. Signing out and back in, which refreshes the authentication token, is the direct fix.
- A “notebook is not available” or location error typically means the notebook was moved, renamed, or deleted in OneDrive, so OneNote can no longer find it at the expected path. Re-open it from its current OneDrive location.
- A storage or quota error means your OneDrive is full and there is no room to upload new content. Free up space or upgrade your storage.
You do not need to memorise these — the point is that the code tells you whether the problem is the section, your account, the notebook’s location, or your storage, so you can go straight to the right fix instead of trying everything. Microsoft maintains detailed, regularly updated troubleshooting references on its official support site if a specific code needs deeper investigation.
What not to do while a notebook is out of sync
A couple of instincts make things worse, so it is worth knowing what to avoid:
- Do not delete the notebook to “start fresh” before confirming your changes have synced. Unsynced edits live only in the local cache; deleting the notebook or its cache without syncing first is how people actually lose notes that were otherwise perfectly safe.
- Do not edit the same pages heavily on two devices while sync is broken. When the connection comes back, OneNote has to merge both sets of changes, and that is when you get duplicate pages with “(conflict)” labels. Make your edits on one device until syncing is restored.
- Do not reinstall OneNote as a first step. It rarely fixes a sync issue that is really an account, location, or storage problem, and it costs you time. Reinstalling is a last resort, not an early one.
If you do end up with conflict pages, OneNote keeps both versions rather than overwriting, so you can open each and copy across whatever you need before deleting the duplicate.
When it is the broader sync, not just OneNote
If OneNote, your files, and other Microsoft apps are all failing to sync together, the problem is probably OneDrive or your account rather than OneNote specifically. In that case, fixing the underlying sync engine resolves OneNote too — our guide on OneDrive files not syncing covers that layer in detail. Similarly, if you are seeing account or sign-in trouble across several Office apps, it is worth treating it as an account-wide issue; the patterns overlap with what we cover for Outlook refusing to open.
OneNote on iPhone, iPad, and Android
On mobile the underlying causes are the same, but a few extra checks apply:
- Background app refresh. If OneNote is restricted from working in the background, it may only sync when you open it. Allow it background data and refresh in your phone’s settings.
- Low Power or Data Saver modes. These can suspend syncing to save battery or data. If notes only update on Wi-Fi or when charging, check these modes.
- Pull to refresh. On the mobile apps, pulling down on the notebook list forces a manual sync, the equivalent of Shift+F9 on the desktop.
Because every device syncs through the same cloud notebook, fixing the account or storage issue on one device usually clears the problem everywhere.
Getting it stable for good
Most OneNote sync problems trace back to one of a few things: a dropped sign-in, a notebook stored locally instead of in the cloud, one oversized page jamming a section, a corrupted cache, or an out-of-date app. Work through them in that order and the notebook comes back into sync. To keep it stable, stay signed in to the correct single account, keep OneNote updated, watch your OneDrive storage, and avoid attaching very large files directly into pages. For other Microsoft apps that stop syncing or behaving, the full guide to fixing common tech errors gathers the related fixes in one place.
