During an IT asset review, you are told that every operating system deployed must be eligible for vendor security patches for at least the next three years. Four unused workstations are discovered, each running a different OS version. Which one already falls outside the vendor's support life cycle and therefore cannot be redeployed?
Microsoft discontinued all support for Windows 8.1 on 10 January 2023, so no additional security updates will ever be released. Because it is already past end-of-life, it cannot satisfy a three-year patch requirement. In contrast, Windows 10 Enterprise LTSC 2019 remains under extended support until January 2029, Ubuntu 22.04 LTS receives standard support until April 2027, and Apple continues to provide security updates for macOS Ventura as it is still within the current supported versions. Thus, only Windows 8.1 fails the policy.
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Why did Microsoft discontinue support for Windows 8.1?
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What is the difference between LTS (Long Term Support) and non-LTS in Ubuntu versions?