If your business still runs Windows 10, there’s a good chance some of your computers stopped getting security updates last month. Nobody sent you a warning. The PCs still turn on, open email and print invoices like nothing happened. That’s what makes this one easy to miss. To add to the confusion, Microsoft quietly gave home users another free year of Windows 10 updates earlier this year. A lot of business owners read that headline and assumed it covered them too. It doesn’t. Here’s what actually changed, how to check your own machines in a few minutes, and what we’d recommend doing about it.