Microsoft declared Office 2016 dead on 14 October 2025, then quietly released 36 security patches for it anyway. The catch is that those fixes only reach MSI installations of Office 2016, not the Click-to-Run version most home and small business customers have.
Microsoft declared Office 2016 dead on 14 October 2025, on the same day as Office 2019.
No more technical support, bug fixes, or security updates. Customers were warned that continuing to use Office 2016 could expose them to “serious and potentially harmful security risks”.
That sounded fairly definite.
Nine months later, Microsoft is still releasing monthly security patches for Office 2016.
There is, naturally, a catch.
The post-end-of-life patches appear to be available for MSI-based Office 2016 installations, but not for the more common retail Click-to-Run edition.
Office 2016 end of support
Microsoft said before the deadline that there would be “no extension and no extended security updates”.
That statement remains technically true. Instead, Microsoft has quietly added a qualification to its Office 2016 update information:
Support for Office 2016 ended on October 14, 2025. However, at Microsoft’s sole discretion, we may choose to issue one or more updates to Office 2016 after October 14, 2025.
In other words, Office 2016 remains unsupported, but Microsoft may patch it whenever Microsoft feels like it.
That’s not extended support. It is more like extended uncertainty.
Nine months of “one or more” updates
“One or more updates” understates what has happened.
Microsoft has released Office 2016 MSI security patches every month from November 2025 through July 2026, including an out-of-band update in January.
The patches cover Word, Excel, PowerPoint, Visual Basic for Applications, charting, drawing, and shared Office components. It’s a lot more than an isolated emergency patch.
There have been 36 distinct Office 2016 patches after the official end of support date, through July 2026.
The July batch alone contains eight Office 2016 updates. Microsoft says the fixes include remote-code-execution and information-disclosure vulnerabilities.
Office 2016 MSI vs Click-to-Run
The important distinction is not simply Office 2016 Home, Professional, or Professional Plus. It is the installation technology.
Microsoft’s individual Office 2016 KB articles say that the updates apply to the Microsoft Installer, or MSI-based, edition of Office 2016.
They also explicitly say: “This update does not apply to Office 2016 Click-to-Run editions.“
That means a customer with an MSI installation can receive the post end-of-life patches, while someone using a Click-to-Run installation of the same Office 2016 generation cannot.
Microsoft’s published update history for retail Office 2016 Click-to-Run ends on: 14 October 2025, Version 2508, Build 19127.20302
Office 2016 Retail versus volume license
It is tempting to describe this as retail Office 2016 versus volume-license Office 2016.
That is mostly, but not entirely, accurate.
Office Professional Plus 2016 and Office Standard 2016 volume-license installations were normally MSI-based. Those are likely to be the largest group still receiving patches.
Retail Office 2016 was more commonly installed using Click-to-Run. However, some retail Office 2016 products were also available as MSI installations. Microsoft’s KB pages can list products such as:
- Office Home and Student 2016
- Office Home and Business 2016
- Office Professional 2016
- Office Standard 2016
- Office Professional Plus 2016
In addition, there are people who bought individual volume license keys. See Ultra-cheap Microsoft Office deals, are they legal and work?.
The decisive test is therefore MSI versus Click-to-Run, not retail versus volume licensing.
How to check your Office 2016 installation
Open Word 2016, Excel 2016, or another Office application.
Go to: File | Account | Product Information.
If there is an Update Options button, Office is installed using Click-to-Run.
If there is no Update Options button, it is an MSI-based installation.
That simple check tells you whether your Office 2016 installation can still receive Microsoft’s unexpected security fixes.
Make sure Windows Update includes other Microsoft products
Office 2016 MSI patches normally arrive through Microsoft Update.
In Windows 11/10, go to: Settings | Windows Update | Advanced options
Turn on: Receive updates for other Microsoft products
Administrators can also obtain individual updates through the Microsoft Update Catalog or deploy them with their normal patch-management system.
Don’t mistake patches for support
None of this means Office 2016 is supported again. Microsoft is not promising:
- monthly updates will continue;
- every Office 2016 vulnerability will be fixed;
- non-security bugs will be corrected;
- compatibility problems will be investigated;
- technical support will be provided; or
- Click-to-Run customers will receive equivalent fixes.
Microsoft can stop issuing these discretionary patches at any time.
Office 2016 also remains unsupported for connections to Microsoft 365 services, a support restriction that began in October 2023, before the desktop product’s final end-of-life date.
A strangely selective afterlife
The oddest part is Microsoft’s selective treatment of Office 2016 customers.
A company with a ten-year-old MSI installation of Office Professional Plus 2016 can continue receiving security fixes.
A home or small-business customer with a newer-style Click-to-Run installation of Office 2016 apparently cannot.
Both products reached end of support on the same day. Both carry the Office 2016 name. Both remain unsupported.
Only one is still being patched and Microsoft hasn’t explained why.
Office 2019 is also still getting updates, and Office 2019 is Click-to-Run only. So the installation method doesn’t explain the reason for the split in Office 2016 updates, only how it’s being deployed.
Office 2019 Is Still Getting Security Updates, But Only for Some
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