First it is and then it isn't. Last month, Microsoft issued a "highly unusual" patch for Windows XP to help prevent the spread of the WannaCry ransomware worm. The Verge reported that Microsoft has done it again.
"In reviewing the updates for this month, some vulnerabilities were identified that pose elevated risk of cyberattacks by government organizations, sometimes referred to as nation-state actors, or other copycat organizations," says Adrienne Hall, general manager of crisis management at Microsoft. "To address this risk, today we are providing additional security updates along with our regular Update Tuesday service. These security updates are being made available to all customers, including those using older versions of Windows."
So there you have it. If you are still using an unsupported operating system, patch it immediately. If Microsoft keeps issuing patches for unsupported software, it will never be able to retire older versions.
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Digital Forensics/Information Security/Information Technology