A crucial Windows security certificate just expired - how to check your PC
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ZDNET's key takeaways
- Secure Boot protects modern Windows and Linux PCs.
- Microsoft Secure Boot certificates from 2011 expire in June and October 2026.
- Most PC owners are fine if they install the latest updates.
Last year's end-of-support deadline for Windows 10 was a big test for consumers and IT pros alike. Congratulations -- everyone passed! Before you start celebrating, though, pay attention to another crucial expiration date that's arriving this week. Four crucial Microsoft security certificates are expiring, with the first one expiring today, June 24, 2026.
Microsoft has been refreshingly transparent about what it's doing to replace these old certificates, with guidance for both consumers and enterprise customers. It also added an easy way for anyone to check the status of the certificates, using the built-in Windows Security utility. (More details on that later in this post.) Oh,...
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