Somewhere in your office there is a computer that turns on fine every morning. It opens email, prints invoices, and has never given anyone a reason to think about it. It is also, in all likelihood, no longer getting security updates.
That is the awkward part of the Windows 10 story. Nothing broke. The machine just stopped being fixed.
What changed, and when
Microsoft ended support for Windows 10 on October 14, 2025. On its own support page, the company says a Windows 10 computer will keep working after that date, but it "will no longer receive security updates." For years, Microsoft found and closed security holes in the operating system every month. That stopped. The computer did not get slower and it did not start crashing. It just stopped being repaired, while the people looking for ways in kept at it.
Why a computer that works is still a problem
When a flaw is found in an operating system, the fix arrives as an update. Without updates, the flaw stays open. It does not matter that the machine is fast, that it has a respectable antivirus program, or that nobody in the shop has ever clicked a bad link. An unpatched machine is a known way in, and the people who break into systems keep careful lists of known ways in.
This is not a rare situation. As of August 2026, about 30 percent of Windows desktop computers worldwide were still running Windows 10, according to StatCounter. That is roughly ten months after support ended. A lot of machines are sitting on the wrong side of that deadline.
"Just upgrade it" is not always the answer
The obvious next thought is to run the upgrade. Microsoft says the move to Windows 11 is free, but only for computers that meet its minimum hardware requirements. Those requirements are not small. The machine needs a security chip called TPM 2.0, along with up-to-date firmware and other modern parts.
Some computers in your office will upgrade without much fuss. Others simply cannot, because they were never built with the required hardware. That is worth knowing before you open Windows Update and hope for the best.
What good looks like
A business that has this under control does four ordinary things.
They keep a list of every computer, who uses it, and how old it is. You cannot fix what you have not counted, and most small offices have never actually counted.
They know which machines can be upgraded and which ones need to be replaced. That turns a vague worry into a short, specific list.
They sort by what the machine touches. A PC at the front counter that only prints work orders is a different risk than the laptop that signs in to online banking and payroll. The second one deserves attention first.
They put replacements on a schedule instead of waiting for a failure. A computer that is five or six years old is not a surprise. It is a date on a calendar, and you get to choose the month instead of having it chosen for you.
The part that actually helps
None of this requires a big project. It requires knowing where you stand.
You do not need a new computer for every desk, and you do not need to panic about the one in the back office. You need an honest list, a plain answer about which machines still receive updates and which ones do not, and a sensible order for dealing with them.
That is the whole point. A working computer is not the same as a supported computer, and the difference between the two is something you can measure in an afternoon rather than discover on a bad Tuesday.