The October 2025 Windows security update is now available for Windows 10

(🧵1/9) Windows 10 release notes:
•Versions 21H2, 22H2 (KB5066791): support.microsoft.com/help/5066791
•Version 1809 (KB5066586): support.microsoft.com/help/5066586
•Version 1607; Windows Server 2016 (KB5066836): support.microsoft.com/help/5066836
•Version 1507 (KB5066837): support.microsoft.com/help/5066837

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The October 2025 Windows security update is now available for Windows 11

(🧵1/7) Windows 11 release notes: 
•Versions 25H2 & 24H2 (KB5066835): support.microsoft.com/help/5066835
•Version 22H2 & 23H2 (KB5066793): support.microsoft.com/help/5066793

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Today, we are announcing the availability of the Windows 11 2025 Update, also referred to as Windows 11, version 25H2. 🎉
(🧵1/7) Version 25H2 will be delivered as an enablement package (eKB). This means that it contains all the recently announced features in Windows 11, version 24H2.



(🧵2/7)aka.ms/ekb-w11-25H2

Today marks the beginning of the Windows 10 November 2021 Update (Windows 10, version 21H2) availability. We will be throttling availability up over the coming weeks to ensure a reliable download experience. If you would like to install the new release, open your Windows Update settings (Settings > Update & Security > Windows Update) and select Check for updates.

Our commitment is to keep devices protected and productive through best-in-class servicing. Here are some lifecycle and servicing updates for Windows 11. 1. Windows 11 will have an annual feature update cadence, a change from the semi-annual cadence of Windows 10.

📝 [Release Notes Published] The following release notes coincide with Cumulative Updates for Tuesday, August 11th, 2020. 📄 Windows 10, version 2004 – KB4566782 – support.microsoft.com/help/4566782