ONENOTE.EXE

Application ProcessMicrosoft Corporation

Also called onenote, desktop onenote, onenote 2016

WindowsApplication

Desktop OneNote from Microsoft 365 or Office. It is not Word (WINWORD.EXE) and it is not OneNoteM.exe.

What you need to know

ONENOTE is OneNote, not WINWORD and not OneNoteM.

ONENOTE.EXE is the Win32 desktop OneNote client. WINWORD.EXE is Word. OneNoteM.exe is a different OneNote image Microsoft ships beside it. Ending this process drops unsaved notes in this client only.

Safe?: Yes, from Office
Same as Word?: No. Word is WINWORD.EXE
Same as OneNoteM?: No. That is another OneNote image

Feex says

If the notebook chrome looks like classic OneNote and the name is ONENOTE, I leave WINWORD alone. I also do not end OneNoteM thinking it is the same window.

What is ONENOTE.EXE?

ONENOTE.EXE is desktop OneNote. It is not WINWORD.EXE and it is not OneNoteM.exe. Click-to-Run places the classic client under Office16.

What does it do?

It syncs notebooks and hosts add-ins for this desktop build. Word does not store those sections. OneNoteM.exe is a separate OneNote host when that build is installed.

Why is it running?

You opened a notebook, a .one file, or an Office installer still registered this client. A second OneNote tile may start OneNoteM instead.

Is it safe?

Usually safe

Office16\ONENOTE.EXE signed by Microsoft is desktop OneNote. onenote.exe in a zip is not. OneNoteM.exe is still a different image.

A legitimate copy normally runs from:

C:\Program Files\Microsoft Office\root\Office16\ONENOTE.EXE

Desktop OneNote
Not WINWORD.EXE
Not OneNoteM.exe

Can I end it?

You lose unsaved notes in this client

Ending ONENOTE.EXE closes desktop OneNote. Word stays. OneNoteM.exe can stay if that other client is open.

Can I remove it?

Uninstall or change Office apps

Do not delete ONENOTE.EXE. Use Microsoft 365 Apps setup to remove OneNote. That is not a Word uninstall by itself.

Should it start with Windows?

On demand unless Send to OneNote or a Startup shortcut starts it.

Normal resource behavior

These are contextual labels, not universal averages.

CPU: Sync and ink
Memory: Large notebooks and ink cache
Disk: Local cache
Network: OneDrive and SharePoint notebooks

File information

ONENOTE.EXE file information
Executable name	ONENOTE.EXE
Common legitimate path	C:\Program Files\Microsoft Office\root\Office16\ONENOTE.EXE
Publisher	Microsoft Corporation
Signature expectation	Signed by Microsoft Windows

Common problems

Two OneNote names after an Office update

ONENOTE.EXE is this desktop client. OneNoteM.exe is the other OneNote image. Pick one in Default apps.

People end WINWORD to stop note sync

Notebooks are not Word documents. Check this process and the OneDrive client.

Troubleshooting

Diagnose before you change anything destructive.

See which OneNote tile you launched

Open file location. Office16\ONENOTE.EXE is this article. OneNoteM.exe is the sibling they swapped.

Repair Office if notebooks will not open

Do not download ONENOTE.EXE from a filename site.

Technical details

ONENOTE.EXE technical details
Image name	ONENOTE.EXE
Friendly name	Desktop OneNote

Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. How we research.

Microsoft Support: OneNote · Desktop OneNote help
Microsoft Learn: OneNote · OneNote clients
Microsoft Learn: Microsoft 365 Apps · Office16 Click-to-Run path
Foxhole process map · First-party samples on Windows PCs. Not a lab benchmark.

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