In this release, Windows Defender System Guard enables an even higher level of System Management Mode (SMM) Firmware Protection that goes beyond checking the OS memory and secrets to other resources like registers and IO. This feature is built on top of System Guard Secure Launch to reduce the firmware attack surface and ensure that the System Management Mode (SMM) firmware on the device is operating in a healthy manner - specifically, SMM code can't access the OS memory and secrets. System Guard has improved a feature in this version of Windows called SMM Firmware Protection. Thus, the LTSC 2021 release is not a direct replacement for LTSC 2019, which has a 10 year lifecycle.įor more information about the lifecycle for this release, see The next Windows 10 Long Term Servicing Channel (LTSC) release. Windows 10 Enterprise LTSC 2021 has a 5 year lifecycle ( IoT Enterprise LTSC continues to have a 10 year lifecycle).
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