Windows 10 hit end of life. Here's what that actually means for your business

By Leonel Lordeus · Lordeus Pro · 5 min read

A client called me recently locked out of every app they use for work. No warning. One morning the system just said no, compliance block. We dug in, and the cause wasn't a hack or a stolen password. Their computers were still on Windows 10, and the apps they relied on had quietly raised the security bar those machines could no longer meet.

The apps noticed before the owner did. That's the whole problem with Windows 10 right now, in one story.

What "end of life" actually means

Microsoft stopped supporting Windows 10 on October 14, 2025. "End of life" sounds dramatic, but the plain version is simpler: no more security updates. The system still boots, still runs your software, still looks exactly like it did a year ago. It just stopped getting the monthly patches that fix newly discovered holes.

So every flaw found in Windows 10 since last October is still sitting there, unpatched, on every machine still running it. And new ones get found all the time.

"But it still works fine"

I hear that about old computers constantly. The trouble is that "works" and "safe" aren't the same thing. A smoke detector with the battery pulled out still hangs on the wall and still looks like a smoke detector. It's just not doing the one job you're counting on.

A Windows 10 machine today runs like it always did, and it's a little less protected every month that passes. You don't feel it. That's exactly why it's dangerous.

Where this actually bites

Three places, and none of them are hypothetical.

• Someone gets in. Unpatched machines are the easiest way into a network, because the holes are published and nobody's closing them.
• Your software locks you out. Like my client. More apps and platforms now check whether your system is supported before they let you in, and an unsupported OS can fail that check overnight.
• Your insurance or a contract calls you on it. Cyber-insurance renewals and client contracts increasingly ask, in writing, whether you run supported systems. If something goes wrong on a machine you knew was unsupported, "we didn't know" is a weak answer to give an insurer, and a denied claim costs far more than the fix would have.

What about Extended Security Updates (ESU)?

Microsoft will sell you more time. For businesses, Extended Security Updates run $61 per device the first year, $122 the second, and $244 the third. The price doubles every year. And it's cumulative: if you wait and buy in year two, you still owe year one. It covers security patches only, nothing else, and it runs out for good in October 2028.

ESU is a bridge, not a destination. It makes sense for a specific machine you can't replace yet, running something that only works on Windows 10. It does not make sense as a plan for your whole office. (There's a cheaper consumer version for personal PCs, but it isn't built for a business fleet, so I'm leaving it out of the business math.)

Your real options

The fix usually isn't "buy all new computers." It's usually a mix:

• Upgrade to Windows 11. Many machines from the last several years run it for free. The common blocker is the processor, roughly 8th-generation Intel or newer.
• Buy ESU for the one or two machines you genuinely can't move yet.
• Replace the computers too old to upgrade. Not all of them. The oldest ones.
• Retire what you don't actually need anymore. There's usually at least one.

But you can't make any of those calls until someone tells you what you've actually got, machine by machine. Most owners don't have that list.

How to find out where you stand

The ten-minute version: walk around and note which computers say Windows 10 versus Windows 11. If you're not sure how to check, that's a quick thing to learn.

Or I'll do it for you. My free Systems Checkup is a 20-minute call where I tell you exactly which of your machines are exposed, which can upgrade, and which actually need replacing. You keep a one-page report either way.

Common questions

When did Windows 10 reach end of life?

October 14, 2025. After that date Microsoft stopped issuing security updates for it.

Is it safe to keep using Windows 10?

It works, but it no longer gets security patches, so the risk grows every month. For a business, running unsupported machines is also increasingly a compliance and insurance problem, not just a technical one.

What does Extended Security Updates cost for a business?

$61 per device the first year, then $122, then $244, with the price doubling each year and back-years owed if you start late. It's available through October 2028 and covers security patches only.

Can my computer run Windows 11?

Often yes, for free, if it's from roughly the last five to seven years. The usual blocker is an older processor (pre-8th-generation Intel). A quick check tells you per machine.

What should a small business do first?

Find out which of your machines are still on Windows 10. You can't plan the fix until you know the scope.