onenoteupdate.exe

Microsoft OneNote Update Service

System ProcessSafeOffice Component

CPU Usage

2-12%

Memory

40-150 MB

Location

C:\Program Files\Microsoft Office\root\Office16

Publisher

Microsoft Corporation

Quick Answer

onenoteupdate.exe is part of Microsoft Office updates. It runs in the background to check, download, and apply OneNote and related Office updates, keeping your notebooks secure and feature-rich.

Is it a Virus?

NO - Safe

Must be in C:\Program Files\Microsoft Office\root\Office16\onenoteupdate.exe or C:\Program Files (x86)\Microsoft Office\root\Office16\onenoteupdate.exe

Can I Disable?

YES

Disabling may stop OneNote updates and security patches.

Can I Uninstall?

YES

Uninstalling OneNote updates affects Office functionality; prefer disabling updates instead.

What is onenoteupdate.exe?

onenoteupdate.exe is the updater component for Microsoft OneNote within Office. It runs in the background as a system/service-like process, periodically contacting Microsoft update servers to fetch latest OneNote fixes, features, and security patches and applying them without requiring constant user interaction.

This updater coordinates patch delivery for OneNote and related Office components. It runs as a background process, verifies packages, and applies updates to keep OneNote features and security current.

Quick Fact: OneNote updates are delivered via the Office Click-to-Run infrastructure, with onenoteupdate.exe coordinating download and installation without interrupting your work.

Types of OneNote Update Processes

Updater Service: Background process that checks for OneNote updates
Downloader Process: Downloads update packages from Microsoft servers
Installer Hook: Applies updates to OneNote components within Office
Telemetry & Health Check: Sends minimal telemetry to improve update delivery

Is onenoteupdate.exe Safe?

Yes, onenoteupdate.exe Safe when it's the legitimate Microsoft file updated via Office/OneNote updates.

Is onenoteupdate.exe a Virus or Malware?

The genuine onenoteupdate.exe is NOT a virus. However, malware can masquerade as it. Verify location and signature.

How to Tell if onenoteupdate.exe is Legitimate or Malware

File Location:: Must be in C:\Program Files\Microsoft Office\root\Office16\onenoteupdate.exe or C:\Program Files (x86)\Microsoft Office\root\Office16\onenoteupdate.exe. Any other path is suspicious.
Digital Signature:: Right-click the file in File Explorer -> Properties -> Digital Signatures. Should show "Microsoft Corporation" as the signer.
Resource Usage:: Normal usage is 2-12% CPU across the updater, with 40-150 MB memory. Persistent high usage outside update windows is suspicious.
Behavior:: Should only run during update checks or installations. Continuous background activity when Office is idle may indicate a problem.

Red Flags: If onenoteupdate.exe resides in unusual folders (like Temp or AppData), runs when Office isn't open, lacks a valid signature, or uses unexpected resources, scan for malware. Be wary of similarly named files.

Why Is onenoteupdate.exe Running on My PC?

onenoteupdate.exe runs to keep OneNote and related Office components current by checking for updates, downloading patches, and applying them in the background.

Reasons it's running:

Office Update Scheduling: OneNote updates are triggered by Office update schedules to ensure notebook features and security patches are current.
Background Update Checks: The updater runs periodically to verify and fetch new OneNote updates even if OneNote isn't open.
Office Click-to-Run: Office uses Click-to-Run architecture; update components like onenoteupdate.exe operate as background tasks.
New Features and Fixes: Updates bring feature improvements, bug fixes, and sync enhancements for OneNote.
Security Patches: Updates include security patches that protect OneNote data and related Office components.

Can I Disable or Remove onenoteupdate.exe?

Yes, you can disable updater activity, but updates may stop and OneNote may miss important security patches. Prefer configuring updates to manual or restricted mode.

How to Stop onenoteupdate.exe

End Active Updater: Open Task Manager (Ctrl+Shift+Esc) -> Processes -> find onenoteupdate.exe and End Task
Disable Office Updates: Open any Office app -> File > Account > Update Options > Disable Updates
Prevent Startup: Task Manager -> Startup tab -> Disable any Office Update services
Pause Background Updates: In Office settings, disable 'Automatically update Office' or set Update Options to manual
Manual Uninstall (as last resort): Uninstall Office or use Repair options in Apps & Features to reset update behavior

How to Uninstall OneNote Update Components

✔ Windows Settings → Apps → Apps & Features → Microsoft Office → Modify → Add or Remove Features → OneNote (and updater components) can be toggled if supported
✔ Or uninstall Microsoft Office entirely from Settings if you don't use OneNote
✔ Reinstall Office later if needed

Common Problems: Update Failures or Resource Use

If onenoteupdate.exe is causing issues:

Common Causes & Solutions

Office Update Service Blocked: Ensure Office can reach Microsoft update servers; check firewall/proxy settings
Corrupted Update Cache: Reset the Office update cache by running 'officeupdate.exe /resetcache' or clearing cache folders
Network Connectivity Issues: Check network, VPNs, or firewall rules that block update traffic
Conflicting Extensions or Add-ins: Disable Office add-ins or OneNote integrations that interfere with updates
Outdated Office Version: Update Office to latest build; run Windows Update as well
Insufficient Disk Space: Free up space and retry the update

Quick Fixes:
1. Quick Fixes:
2. 1. Open any Office app and check for updates to trigger a manual update
3. 2. Run Office Repair from Apps & Features
4. 3. Clear Office cache: delete %localappdata%\Microsoft\Office\Data
5. 4. Ensure Windows Update is enabled and network access is available
6. 5. Restart the computer and try updates again

Frequently Asked Questions

Is onenoteupdate.exe a virus?

No, the legitimate onenoteupdate.exe from Microsoft is not a virus. Verify the path is located under C:\Program Files\Microsoft Office\root\Office16 and that the digital signature is from Microsoft.

Where is onenoteupdate.exe located?

Location matters. The updater should reside in the Office update folder, typically C:\Program Files\Microsoft Office\root\Office16, or C:\Program Files (x86)\Microsoft Office\root\Office16.

Can I disable onenoteupdate.exe?

Yes, you can disable updates for Office OneNote, but you risk missing security patches and features. Use Office Update Options in any Office app to set updates to manual or disable.

Will disabling updates affect security?

Disabling updates for OneNote may leave you without security fixes. If you need to reduce activity, configure Office Update Options to manual updates instead of turning off updates entirely.

How do I update OneNote manually if the updater is blocked?

If updater is blocked, you can try updating OneNote manually via Office > Account > Update Options > Update Now or run Windows Update to fetch Office patches.

Why does onenoteupdate.exe run at startup?

onenoteupdate.exe runs as part of the Office update workflow. It may start at Windows startup if Office is configured to update on startup and sometimes when you launch OneNote.