Windows 10 support ended on October 14, 2025. For Canadian small and mid-sized businesses, that does not mean every Windows 10 computer suddenly stopped working. It does mean that continuing to use Windows 10 requires deliberate management rather than assuming a working PC is a supported PC.

In 2026, businesses should identify every remaining Windows 10 device, determine whether it is covered by an appropriate extended-security option, check its Windows 11 compatibility, verify important applications and peripherals, and create a timeline for upgrading or replacing it. Any unsupported device still connected to business systems should be treated as a security and operational risk.

What Windows 10 end of support means in 2026

Microsoft ended standard support for Windows 10 on October 14, 2025. A PC does not shut down when support ends, but the security situation changes. Without an applicable extended-support arrangement, the operating system no longer receives the normal security updates that businesses have relied on.

That matters because operating-system vulnerabilities continue to be discovered. Antivirus, endpoint protection, firewalls, and employee security awareness remain useful controls, but they are not substitutes for keeping the underlying operating system appropriately supported and patched.

There is an important distinction here: a Windows 10 computer covered by an applicable Microsoft Extended Security Updates (ESU) option is different from an old PC that has simply been left running after standard support ended. Extended security options can provide a temporary bridge for eligible systems, but they should be managed intentionally and should not be confused with a permanent lifecycle strategy.

1. Build an accurate inventory of remaining Windows 10 devices

The first step is knowing exactly what you have. A spreadsheet created three years ago is not necessarily an accurate device inventory today.

Your inventory should identify each computer’s user, location, operating-system version, hardware model, approximate age, warranty status, security status, and business purpose. You should also know whether the device is actively managed and receiving the updates you expect it to receive.

Remember to look beyond the obvious office desktops. Older Windows machines often survive in less visible roles: a computer in a warehouse, a laptop used by a field technician, a reception PC, a machine attached to estimating equipment, or a desktop that runs one specialized line-of-business application.

For example, a plumbing or HVAC contractor may have upgraded the laptops used by managers but still have a Windows 10 desktop in the dispatch area. A local professional services company might have an older PC used only for accounting or scanning. Low daily usage does not automatically mean low risk, especially if that computer can access email, cloud applications, customer records, or other network resources.

2. Separate appropriately covered systems from unmanaged exposure

Once you have your inventory, classify every Windows 10 machine. Do not put all of them into one generic category called "old PCs."

A useful review asks whether each machine is on an eligible and properly configured extended-security path, whether security updates are actually being installed, whether endpoint security is active, and whether there is a documented retirement date.

If a machine is still running Windows 10 without an appropriate support path, that should be visible on your risk list. It should not disappear into the background simply because nobody has reported a problem yet.

This is also a useful time to check why the machine remains on Windows 10. The answer might be hardware limitations, a specialized application, a peripheral that has not been tested with Windows 11, budget timing, or simply an upgrade that was never scheduled. Each cause requires a different solution.

3. Check hardware compatibility for a Windows 11 upgrade

Some Windows 10 PCs can be upgraded to Windows 11. Others do not meet Microsoft’s hardware requirements or may be poor candidates for further investment because of their age.

Windows 11 requirements include supported hardware and security capabilities such as TPM 2.0 and Secure Boot. Microsoft provides compatibility tools and documentation that can help determine whether a device qualifies.

A technically possible upgrade is not always the best business decision. Consider the age and condition of the device alongside its compatibility. Spending time upgrading a PC that is already near the end of its useful business life may simply move a replacement expense a short distance into the future.

A five- or six-year-old field laptop with a deteriorating battery, limited storage, and no remaining warranty, for example, may be better replaced than upgraded even if a path to Windows 11 exists.

4. Test business applications and peripherals

Operating-system compatibility is only part of the Windows 11 upgrade question. Your business also needs its applications and equipment to work after the change.

Before a larger rollout, identify software and peripherals that are important to day-to-day operations. These may include accounting software, estimating tools, dispatch applications, VPN clients, printers, scanners, label printers, payment equipment, industry-specific software, and older browser-based systems.

Where practical, test a representative Windows 11 device before upgrading every computer. Confirm that the software vendor supports the current environment and that required drivers and integrations work.

For a construction business, one specialized estimating package can be more important than dozens of standard applications. For a local service company, an older label printer or document scanner might create an unexpected bottleneck. Finding those issues before deployment is much cheaper and less disruptive than discovering them on a busy Monday morning.

5. Prioritize upgrades and replacements by business risk

You do not necessarily need to replace every remaining Windows 10 machine on the same day. You do need a defensible order of operations.

Start with machines that present the greatest combination of security exposure and business importance. Higher-priority devices typically include computers used for online banking or financial systems, machines with administrative privileges, computers storing sensitive customer or employee information, and devices with broad access to your network or cloud services.

Then consider operational impact. A single dispatch PC used by an entire home service team may deserve higher priority than an isolated spare laptop, even if both are the same age.

Assign every remaining device an action and target date: upgrade to Windows 11, replace, maintain temporarily under an appropriate extended-security arrangement, isolate for a specific legacy purpose, or retire.

6. Budget for replacements before they become emergencies

Windows 10 end of support highlights a broader budgeting issue: technology expenses are easier to manage when device replacement is planned rather than triggered by failure.

Once you have an accurate inventory, forecast which PCs will need replacement over the next 12, 24, and 36 months. That gives finance and operations leaders a clearer view of upcoming costs and allows replacements to be coordinated with hiring, office changes, busy seasons, and other business priorities.

For example, replacing four aging laptops each quarter may be easier on both cash flow and employees than waiting until 16 machines require urgent replacement. The exact schedule will depend on your organization, but the principle is the same: device age and support status should be visible in the budget before either becomes an emergency.

7. Protect Windows 10 systems that cannot immediately be retired

Sometimes a Windows 10 computer cannot be replaced immediately. A legacy application may require it, a replacement project may already be scheduled, or new equipment may take time to implement.

In that situation, document why the device remains, confirm whether an applicable Microsoft extended-security option is available and correctly configured, and reduce unnecessary exposure. Depending on the role of the machine, that can include restricting network access, removing unnecessary administrator privileges, limiting software, maintaining endpoint security, monitoring the system, and ensuring reliable backups where appropriate.

These controls can reduce risk, but they should not become justification for leaving forgotten computers in production indefinitely. Give exceptions an owner and an end date.

8. Turn the Windows 10 project into better IT lifecycle planning

The most useful outcome from the Windows 10 transition is not simply getting every employee onto Windows 11. It is building a process that makes the next technology transition less disruptive.

Good IT lifecycle planning means maintaining a current device inventory, standardizing hardware where practical, tracking warranties and operating-system support dates, monitoring device health, forecasting replacements, and reviewing your roadmap regularly.

This is where consistent Managed IT services can help. Device management and IT roadmapping make lifecycle decisions part of normal business operations rather than an occasional scramble when a computer fails or software reaches end of support.

For a growing business, that visibility also helps connect IT decisions to risk and budgeting. Owners and finance leaders can see what needs replacing and why, while IT teams or providers can address problems before they interrupt employees.

A practical Windows 10 security and upgrade checklist for 2026

Use the following questions to review your environment:

• Do we know how many Windows 10 PCs are still active?
• Do we know who uses each one and what business function it performs?
• Is each remaining machine appropriately supported, including an applicable extended-security arrangement where required?
• Are security and endpoint-management tools active and monitored?
• Which devices meet Windows 11 hardware requirements?
• Have critical applications, printers, scanners, and other peripherals been checked for Windows 11 compatibility?
• Which machines should be upgraded, replaced, isolated, or retired?
• Does every exception have a responsible owner and target retirement date?
• Are replacement costs included in the IT budget?
• Do we have an ongoing process for tracking device age, warranties, and software support dates?

If several of those questions are difficult to answer, the underlying issue may be broader than Windows 10. It can indicate that the business needs better device visibility and lifecycle management.

Frequently asked questions

When did Windows 10 support end in Canada?

Microsoft ended standard Windows 10 support on October 14, 2025. The date applies to Canadian organizations as part of Microsoft’s broader Windows 10 lifecycle. Eligible extended-security options may provide security updates beyond that date in specific circumstances, but businesses should verify the current Microsoft terms and eligibility for their environment.

Can a business still use Windows 10 in 2026?

A Windows 10 PC can continue to operate, but that is different from being appropriately supported. Businesses should determine whether each remaining system has an applicable extended-security path and understand the risks of continuing to use an unsupported operating system. A planned upgrade or replacement is generally preferable to leaving an unmanaged Windows 10 device in production indefinitely.

Do all Windows 10 computers need to be replaced to run Windows 11?

No. Some existing computers meet Microsoft’s Windows 11 hardware requirements and can be upgraded. Others do not. Even when a machine is technically compatible, its age, warranty, performance, and expected remaining life should be considered before investing time in an upgrade.

What should we do if an important application only works on Windows 10?

Confirm the application’s requirements with its vendor and determine whether an upgrade or replacement version is available. If a Windows 10 system temporarily has to remain in use, document the exception, review extended-security options, limit its exposure where practical, and give the system a clear migration or retirement plan.

How can we find all the Windows 10 devices in our business?

A managed device inventory or endpoint-management platform is preferable to relying on employees to identify machines manually. Your inventory should show operating-system versions alongside users, device models, security status, and other information needed to plan upgrades and replacements.

Make the Windows 10 transition part of your IT roadmap

If Windows 10 devices are still active in your organization, the goal is not to panic and replace everything. The goal is to know where those systems are, understand their support and security status, and make informed decisions about upgrades, replacements, and exceptions.

happier IT helps Canadian businesses manage devices, cybersecurity risk, technology lifecycles, and longer-term IT planning. If you are unsure what is still running Windows 10 or what should happen next, Get a Free IT Assessment to review your current environment and identify practical next steps.