10/16/2026
Windows 10 stopped receiving security updates in October 2025. A year later, plenty of businesses are still running it.
End-of-life software is a quiet risk because nothing breaks. The machine boots, staff work, and the only change is that newly discovered vulnerabilities never get patched. Attackers keep track of which versions stopped getting fixes.
Worth inventorying this quarter: any Windows 10 machines still in service, Server 2016, and the SQL Server and Exchange versions most businesses forget they are running.
The budget conversation is easier in October than it is in March.
Microsoft's lifecycle search tool: https://learn.microsoft.com/en-us/lifecycle/products/
Not sure what is past end of life on your network? A Network Discovery might be in order.
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