Microsoft has given Windows 10 extended support another year of life, pushing the free consumer ESU deadline to October 2027 or about 1 year, 3 months from today. If you run Microsoft 365 or Office on Windows 10, that sounds like good news, but it changes almost nothing for your Office apps. Microsoft 365 updates and features are still restricted and no version of Office 2021 or Office 2024 is supported on Windows 10 at all. Here is exactly what Windows 10 extended support does, and does not, mean for Office users.
The Windows 10 Extended Security Updates (ESU) program has been given another year of life to October 12, 2027 or about 1 year, 3 months from today support options for Microsoft 365 and Office haven’t changed and are still quite limited.
Just because you’re running Windows 10 with ESU does NOT mean that the Microsoft 365 or Office software is also supported. Microsoft’s support is very limited in both cases.
Microsoft’s policy is that Microsoft 365/Office is only supported on Windows releases that are in their standard support timeline. For Windows 10 that full support ended in October 2025 and that’s when the company stopped full support for Microsoft 365 and Office on Windows 10.
The ESU plan is a one-off thing that doesn’t affect the support policies for Microsoft’s other products.
Confusing? Yes. It’s because Microsoft is torn between not alienating the millions of customers unable or unwilling to move from Windows 10 and desperately wanting those millions to switch to Windows 11.
Microsoft 365 with Windows 10 ESU
If you pay for a Microsoft 365 subscription (Personal, Family, Business, etc.), here is the deal on Windows 10:
Security updates continue until October 10, 2028. That is for three years until the Windows 10 end of support date of October 14, 2025. This happens whether you buy ESU for Win10 or not.
BUT
New features stopped. Your Microsoft 365 apps freeze at Version 2608 (due in August 2026 for most people). After that you get security patches only, no new features and no new Copilot capabilities on Windows 10.
Note the date mismatch for consumers. Office security updates run to October 2028, but the free consumer ESU for Windows 10 itself only runs to October 2027 (for the moment).
So there’s a year-long window where Office is still patched but the underlying OS is not, unless you keep some form of ESU going. That’s probably because business customers had the choice of paying for a three-year ESU plan to keep Windows 10 supported until October 2028.
The support catch
Your Microsoft 365 apps get patched, but if something breaks, the answer you’ll hear is “upgrade to Windows 11.”
Even with a valid subscription, Microsoft support is more restrictive on Windows 10. If you report a problem and it happens only on Windows 10 and not on Windows 11, Support will tell you to move to Windows 11.
If you can’t move, they’ll offer basic troubleshooting only, with workarounds that may be limited or unavailable. You also can’t log bugs or request product fixes for Office issues specific to Windows 10.
Microsoft Office 2024 and Office 2021
Perpetual license Office customers have different and more limited support with Windows 10 ESU.
No version of Microsoft Office perpetual license is supported on Windows 10.
Microsoft treats “running Office on Windows 10” as an unsupported configuration, full stop, with no special exceptions or extensions.
That’s been the policy since October 2025 when Windows 10 ended mainstream support. The ESU plan doesn’t count as ‘supported’ as far as Office 2024 or Office 2021 is concerned.
Office 2024 is only supported on Windows 11 until October 2029.
Office 2021 is only supported on Windows 11 until October 2026 when the software ends support completely.
Office software still works on Windows 10, as do earlier versions of Office that are out of support (Office 2019, Office 2016 and earlier). But without security or bug fixes.
Possible installation problem
There are unconfirmed reports that the Microsoft 365/Office installer will block new installations on Windows 10 unless the PC has ESU active.
Existing installs keep working and keep getting their security patches, but setting up Office on a fresh Windows 10 machine may not be possible without ESU.
Microsoft 365 on Windows 10: Support Extended But Only for Security Updates
Office 2021 Support Ends October 13: Your 5 Options Before the Deadline
Microsoft Office Support End Dates 2026: The Complete Checklist
Office 2024: All You Need to Know
All Your Choices Before the End of Windows 10
All About Office 2021 for Windows and Mac
64-bit or 32-bit Office: Which Microsoft 365 Version Should You Choose?
