Windows 10 reaches end of life on October 14, 2025. After that date, Microsoft stops shipping security updates, bug fixes, and technical support for it. If your business runs on Macs, you might assume this is someone else's problem. It isn't, if any of those Macs run Windows.
Plenty of Mac shops keep a Windows 10 install around for one or two apps that only run on Windows. They reach it through Boot Camp, virtualization software, or a remote desktop connection. Once support ends, that Windows 10 environment stops getting security patches. Your hardware is a Mac, but the Windows side sitting on it is now exposed, and so is any business data that passes through it.
An unpatched Windows 10 puts your data at risk
Once the patches stop, here is what that exposes:
Breaches. Unsupported Windows 10 on a Mac is a known target for ransomware and malware, and attackers go after the holes that never get fixed.
Compliance trouble. If you work in a regulated field, running an unsupported operating system can put you out of compliance, even when it is tucked inside a Mac.
Downtime. An attack on those Windows apps stops the work that depends on them.
Your apps will start breaking too
Software vendors follow Microsoft. Once they drop Windows 10, the apps you run on a Mac through virtualization or dual boot start to show it:
Crashes. Apps get flaky, then fail to launch at all.
Missing features. New capabilities ship only for current Windows versions, so your Boot Camp or virtual setup falls behind.
Security gaps. App-level security updates can fail to apply correctly when the Windows 10 underneath them is no longer supported.
Support calls go nowhere
Third-party vendors stop supporting Windows 10 as well, which reaches any of their apps you run on Mac hardware:
No help with problems. Vendors will not troubleshoot issues tied to Windows 10 apps running on your Macs.
New tools won't connect. Productivity tools built for current Windows may run poorly, or not at all, inside Windows 10 on a Mac.
Hardware stops working. New Windows peripherals and drivers may not function in a Windows 10 environment, so you can't add to your setup.
Everything gets slower and more expensive to run
Newer applications expect a current OS and the security that comes with it. Run them on an aging Windows 10 install and you feel the drag:
Lag. Windows 10 apps on a Mac stutter and crash, and your team loses time to it.
Downtime. An unstable system means interruptions, and interruptions cost money.
Rising upkeep. Keeping a legacy Windows 10 environment alive on Mac hardware eats more IT time and budget every month.
What to do before October
A few steps keep your Windows-on-Mac setup running cleanly past the deadline:
Back up your data. Get every piece of critical information backed up before you change anything.
Audit your Windows setup. Find out whether your virtualization software or Boot Camp install can move to Windows 11, or whether you need a different approach.
Plan the upgrades. Macs with Apple Silicon don't support Boot Camp, but virtualization software like Parallels can run Windows 11. Budget for the move.
Bring in an IT partner. A provider who knows Macs can pick the right path for your Windows apps, keep the transition quiet, and tighten security on the way through.
Start now, not in October
The date is fixed and it's close. If your business runs Windows on Macs, sort out the move before support ends. Wait and you are choosing the security holes, the downtime, and the compliance gaps that come with an unsupported system.