Office push Notification Utility Assembly stopped working

snifferpro · Mar 22, 2025

Getting this error on every startup.

Tried reinstalling Office 2021 but error still occurs.
Tried running sfc - no problems found.
Tried running the Office updater - still get error.

I believe this error started after a windows update on or about 03-08-25

Windows Version 24h2 (OS Build 26100.3476

Any help on this error would be appreciated.

Thanks.

antspants · Mar 22, 2025

Hi, welcome

That update/build is KB5053598 Windows 11 Cumulative Update build 26100.3476 (24H2) - March 11

I don’t use 24H2 so I am unsure, can that update be removed? Might be worth checking if the error stops if you can.

antspants · Mar 22, 2025

Antivirus can be a hassle, if using 3rd party.

Some extra things to consider trying:

Fix: Windows Push Notification User Service Has Stopped Working - MiniTool Partition Wizard

This article provides some solutions to fix the “Windows Push Notification User Service has stopped working” issue together with the detailed instructions.

www.partitionwizard.com

snifferpro · Mar 23, 2025

antspants - That article refers to Windows Push Notification) which is working.
The error message I'm getting is "OFFICE push notification utility assembly STOPPED working"
Which sort of tells me that the process was started and STOPPED working.
It also clearly says OFFICE not Windows.
Just for giggles I did go to that link and opened services and the Windows service is running.
Could not even find Office Push Notification in the list.
Can't really remove the update you mentioned.

Thanks for your efforts though.

antspants · Mar 23, 2025

The reason I posted that link is because I thought if Windows Push Notification System Service wasn’t operating properly it might interfere with the Office push Notification Utility Assembly. I can read that your post “clearly says Office not Windows.”.

The only other things I could suggest (just for giggles) is checking eventvwr for anything relating to the Office push Notification Utility Assembly.
Try disabling Office COM add-Ins, seing if there is a change.
Is it .Net reliant? Try reinstalling .Net.
Short of that, try creating another User Account to see if the problem exists there also.

snifferpro · Mar 23, 2025

Checked event viewer and found the attached image.

Rataskanken · May 12, 2025

snifferpro said:
Checked event viewer and found the attached image.

This has been a pain also for me, with a private licence of Office16 Pro stolen by Microsoft by involuntarily converting it to the Office365 hydra. This happened the very moment I logged into my work account, where the IT department seems to be married with Microsoft. I have tried before to remove this file, but it is put back in place by the Mighty Hand of Microsoft (unless it is a virus toat goes undetected. My take on this is that if the system cannot read or alter this file, it should also not be able to start a kernel process based on this code. I therefore renamed the file to opushutil.exe_ (note the pending underscore), created (in a non-protected directory) an empty textfile that was renamed to opushutil.exe, copied it as administrator to the directory where it was found in the Error log entry, overriding the warning, and then removed all inherrited permissions from this empty dummyfile. This left the empty opushutil.exe file without any permissions, and only me as administrator and owner can manually grant permissions to it. This has worked before on stubborn code that reappears automatically by some malignant action of Microsoft. Let's see how it turns out this time.

HG23Phenom · 2025-05-28T15:00:40-0400

Rataskanken said:
This has been a pain also for me, with a private licence of Office16 Pro stolen by Microsoft by involuntarily converting it to the Office365 hydra. This happened the very moment I logged into my work account, where the IT department seems to be married with Microsoft. I have tried before to remove this file, but it is put back in place by the Mighty Hand of Microsoft (unless it is a virus toat goes undetected. My take on this is that if the system cannot read or alter this file, it should also not be able to start a kernel process based on this code. I therefore renamed the file to opushutil.exe_ (note the pending underscore), created (in a non-protected directory) an empty textfile that was renamed to opushutil.exe, copied it as administrator to the directory where it was found in the Error log entry, overriding the warning, and then removed all inherrited permissions from this empty dummyfile. This left the empty opushutil.exe file without any permissions, and only me as administrator and owner can manually grant permissions to it. This has worked before on stubborn code that reappears automatically by some malignant action of Microsoft. Let's see how it turns out this time.

Precisely what I was about to do and I came across your post. Before implementing, just thought I'd ask if you'd run into any issues so far?

Although I can uninstall this specific office push notification utility using nirsoft tools, I had a feeling that it would probably come back, or even worse, brick my install which MS is week known for with MSIx installed 2016 office package suite and then wanting you to provide license again which I cannot find anymore. Their way of getting us off these perpetual licenses, real POS.

Office push Notification Utility Assembly stopped working

snifferpro

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Fix: Windows Push Notification User Service Has Stopped Working - MiniTool Partition Wizard

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snifferpro

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