Windows Server

October 2026

• Fri 9 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 1607 and Windows Server 2016 Security Baseline.zip
• Fri 9 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 1809 and Windows Server 2019 Security Baseline.zip
• Fri 9 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 20H2 and Windows Server Version 20H2 Security Baseline.zip
• Fri 9 Oct Install and upgrade Revised by Microsoft · Windows Server 2022 Security Baseline.zip
• Fri 9 Oct Install and upgrade Revised by Microsoft · Windows Server 2025 Security Baseline - 2602.zip
• Thu 8 Oct Install and upgrade Security baseline · Windows 10 Version 1607 and Windows Server 2016 Security Baseline.zip
• Thu 8 Oct Install and upgrade Security baseline · Windows 10 Version 1809 and Windows Server 2019 Security Baseline.zip
• Thu 8 Oct Install and upgrade Security baseline · Windows 10 Version 20H2 and Windows Server Version 20H2 Security Baseline.zip
• Thu 8 Oct Install and upgrade Security baseline · Windows Server 2022 Security Baseline.zip
• Thu 8 Oct Install and upgrade Security baseline · Windows Server 2025 Security Baseline - 2602.zip
• Wed 7 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 1607 and Windows Server 2016 Security Baseline.zip
• Wed 7 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 1809 and Windows Server 2019 Security Baseline.zip
• Wed 7 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 20H2 and Windows Server Version 20H2 Security Baseline.zip
• Wed 7 Oct Install and upgrade Revised by Microsoft · Windows Server 2022 Security Baseline.zip
• Wed 7 Oct Install and upgrade Revised by Microsoft · Windows Server 2025 Security Baseline - 2602.zip
• Tue 6 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 1607 and Windows Server 2016 Security Baseline.zip
• Tue 6 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 1809 and Windows Server 2019 Security Baseline.zip
• Tue 6 Oct Install and upgrade Revised by Microsoft · Windows 10 Version 20H2 and Windows Server Version 20H2 Security Baseline.zip
• Tue 6 Oct Install and upgrade Revised by Microsoft · Windows Server 2022 Security Baseline.zip
• Tue 6 Oct Install and upgrade Revised by Microsoft · Windows Server 2025 Security Baseline - 2602.zip

September 2026

• Wed 30 Sep Issues and security Known issue resolved · Incorrect notifications that "Microsoft Defender Antivirus is turned off"
• Tue 29 Sep Issues and security Known issue · mitigated · USB audio devices might fail to start or produce no sound
• Tue 29 Sep Install and upgrade Revised by Microsoft · Windows 10 Version 1607 and Windows Server 2016 Security Baseline.zip
• Tue 29 Sep Install and upgrade Revised by Microsoft · Windows 10 Version 1809 and Windows Server 2019 Security Baseline.zip
• Tue 29 Sep Install and upgrade Revised by Microsoft · Windows 10 Version 20H2 and Windows Server Version 20H2 Security Baseline.zip
• Tue 29 Sep Install and upgrade Revised by Microsoft · Windows Server 2022 Security Baseline.zip
• Tue 29 Sep Install and upgrade Revised by Microsoft · Windows Server 2025 Security Baseline - 2602.zip
• Thu 17 Sep Issues and security Known issue resolved · Remote Desktop Services might stop responding after Sept. 2026 security update
• Mon 14 Sep Issues and security Out-of-band release · KB5129235 · Windows Server 2025
• Mon 14 Sep Issues and security Out-of-band release · KB5129237 · Windows Server 2022
• Mon 14 Sep Issues and security Out-of-band release · KB5129238 · Windows 10, version 1809 +1
• Mon 14 Sep Issues and security Out-of-band release · KB5129239 · Windows 10, version 1607 +1
• Mon 14 Sep Issues and security Partner announcement · Windows Server 2016 Extended Security Updates: CSP price list republish
• Fri 11 Sep New and changed features Windows news · 30-Day Reminder: Windows Server 2022 will reach end of mainstream support on October 13, 2026
• Tue 8 Sep Install and upgrade Security release · KB5122871 · Windows Server 2025
• Tue 8 Sep Install and upgrade Security release · KB5122876 · Windows 10, version 1809 +1
• Tue 8 Sep Install and upgrade Security release · KB5122882 · Windows Server 2022
• Tue 8 Sep Install and upgrade Security release · KB5123099 · Windows 10, version 1607 +1
• Tue 1 Sep New and changed features Azure update · [Launched] Generally Available: Windows Server 2025 on AKS

August 2026

• Fri 14 Aug New and changed features Windows news · 60-Day Reminder: Windows Server 2022 will reach end of mainstream support on October 13, 2026
• Thu 13 Aug Issues and security Partner announcement · Windows Server 2016 Extended Security Updates: CSP price list republish
• Wed 12 Aug New and changed features Windows news · Join the Azure Arc Customer & Engineering Forum for Windows Server
• Tue 11 Aug Install and upgrade Security release · KB5120233 · Windows Server 2025
• Tue 11 Aug Install and upgrade Security release · KB5120238 · Windows 10, version 1809 +1
• Tue 11 Aug Install and upgrade Security release · KB5120242 · Windows Server 2022
• Tue 11 Aug Install and upgrade Security release · KB5120418 · Windows 10, version 1607 +1

July 2026

• Wed 22 Jul New and changed features Product news · Some tools and techniques for hardening Windows Server
• Thu 16 Jul New and changed features Windows news · 90-Day Reminder: Windows Server 2022 will reach end of mainstream support on October 13, 2026
• Thu 16 Jul New and changed features Windows news · Announcing Trusted Launch for Virtual Machines for Windows Server Insiders
• Tue 14 Jul Issues and security Exploited vulnerability · Active Directory Federation Services Elevation of Privilege Vulnerability
• Tue 14 Jul Issues and security Publicly disclosed vulnerability · Windows BitLocker Security Feature Bypass Vulnerability
• Tue 14 Jul Install and upgrade Security release · KB5099535 · Windows 10, version 1607 +1
• Tue 14 Jul Install and upgrade Security release · KB5099536 · Windows Server 2025
• Tue 14 Jul Install and upgrade Security release · KB5099538 · Windows 10, version 1809 +1
• Tue 14 Jul Install and upgrade Security release · KB5099540 · Windows Server 2022
• Mon 13 Jul New and changed features Windows news · Patch the Kernel, Skip the Reboot: The Case for Arc-Enabled Hotpatching on Windows Server 2025
• Jul 2026 New and changed features Product news · Migrate Windows Server 2025 domain controllers to sensor v3.x

June 2026

• Fri 26 Jun New and changed features Windows news · Windows Server 2022 hotpatch update support extended through October 2027
• Tue 9 Jun Issues and security Publicly disclosed vulnerability · Windows Collaborative Translation Framework (CTFMON) Elevation of Privilege Vulnerability
• Tue 9 Jun Issues and security Publicly disclosed vulnerability · HTTP.sys Denial of Service Vulnerability
• Tue 9 Jun Issues and security Publicly disclosed vulnerability · Windows BitLocker Security Feature Bypass Vulnerability
• Tue 9 Jun Install and upgrade Security release · KB5094122 · Windows 10, version 1607 +1
• Tue 9 Jun Install and upgrade Security release · KB5094123 · Windows 10, version 1809 +1
• Tue 9 Jun Install and upgrade Security release · KB5094125 · Windows Server 2025
• Tue 9 Jun Install and upgrade Security release · KB5094128 · Windows Server 2022

May 2026

• Tue 12 May Install and upgrade Security release · KB5087537 · Windows 10, version 1607 +1
• Tue 12 May Install and upgrade Security release · KB5087538 · Windows 10, version 1809 +1
• Tue 12 May Install and upgrade Security release · KB5087539 · Windows Server 2025
• Tue 12 May Install and upgrade Security release · KB5087545 · Windows Server 2022
• May 2026 New and changed features Product news · Known limitation: Migration of domain controllers with Windows Server 2025 from sensor v2.x to sensor v3.x is not supported

April 2026

• Wed 29 Apr New and changed features Windows news · Opt-In Windows Server 2025 Feature Update from the WS 2022 and WS 2019 Settings Dialog
• Sun 19 Apr Issues and security Out-of-band release · KB5091157 · Windows Server 2025
• Sun 19 Apr Issues and security Out-of-band release · KB5091572 · Windows 10, version 1607 +1
• Sun 19 Apr Issues and security Out-of-band release · KB5091573 · Windows 10, version 1809 +1
• Sun 19 Apr Issues and security Out-of-band release · KB5091575 · Windows Server 2022
• Sun 19 Apr New and changed features Windows news · Take action: Out-of-band updates released for Windows Server to address two issues
• Tue 14 Apr Install and upgrade Security release · KB5082063 · Windows Server 2025
• Tue 14 Apr Install and upgrade Security release · KB5082123 · Windows 10, version 1809 +1
• Tue 14 Apr Install and upgrade Security release · KB5082142 · Windows Server 2022
• Tue 14 Apr Install and upgrade Security release · KB5082198 · Windows 10, version 1607 +1

March 2026

• Fri 13 Mar New and changed features Windows news · Introducing the Windows NVMe-oF Initiator Preview in Windows Server Insiders Builds
• Wed 11 Mar New and changed features Windows news · Save the date: Windows Server Summit – May 11-13, 2026
• Tue 10 Mar Install and upgrade Security release · KB5078740 · Windows Server 2025
• Tue 10 Mar Install and upgrade Security release · KB5078752 · Windows 10, version 1809 +1
• Tue 10 Mar Install and upgrade Security release · KB5078766 · Windows Server 2022
• Tue 10 Mar Install and upgrade Security release · KB5078938 · Windows 10, version 1607 +1
• Wed 4 Mar New and changed features Windows news · From Guesswork to Clarity: GPP Diagnostics Improve in Windows Server 2025 and Windows 11 24H2
• Mon 2 Mar Issues and security Out-of-band release · KB5082314 · Windows Server 2022

February 2026

• Fri 27 Feb New and changed features Windows news · Announcing ReFS Boot for Windows Server Insiders
• Thu 26 Feb New and changed features Windows news · Windows Server 2025 Remote Desktop Session Host Capacity Planning Whitepaper
• Mon 23 Feb Issues and security Security news · Security baseline for Windows Server 2025, version 2602
• Mon 23 Feb New and changed features Windows news · Windows Server Secure Boot playbook for certificates expiring in 2026
• Tue 10 Feb Install and upgrade Security release · KB5075899 · Windows Server 2025
• Tue 10 Feb Install and upgrade Security release · KB5075904 · Windows 10, version 1809 +1
• Tue 10 Feb Install and upgrade Security release · KB5075906 · Windows Server 2022
• Tue 10 Feb Install and upgrade Security release · KB5075999 · Windows 10, version 1607 +1

January 2026

• Sat 24 Jan Issues and security Out-of-band release · KB5078131 · Windows 10, version 1809 +1
• Sat 24 Jan Issues and security Out-of-band release · KB5078135 · Windows Server 2025
• Sat 24 Jan Issues and security Out-of-band release · KB5078136 · Windows Server 2022
• Sat 17 Jan Issues and security Out-of-band release · KB5077793 · Windows Server 2025
• Sat 17 Jan Issues and security Out-of-band release · KB5077795 · Windows 10, version 1809 +1
• Sat 17 Jan Issues and security Out-of-band release · KB5077800 · Windows Server 2022
• Tue 13 Jan Install and upgrade Security release · KB5073379 · Windows Server 2025
• Tue 13 Jan Install and upgrade Security release · KB5073457 · Windows Server 2022
• Tue 13 Jan Install and upgrade Security release · KB5073722 · Windows 10, version 1607 +1
• Tue 13 Jan Install and upgrade Security release · KB5073723 · Windows 10, version 1809 +1
• Mon 5 Jan New and changed features Windows news · Announcing Native NVMe in Windows Server 2025: Ushering in a New Era of Storage Performance

December 2025

• Thu 18 Dec Issues and security Out-of-band release · KB5074974 · Windows 10, version 1607 +1
• Thu 18 Dec Issues and security Out-of-band release · KB5074975 · Windows 10, version 1809 +1
• Tue 9 Dec Install and upgrade Security release · KB5071543 · Windows 10, version 1607 +1
• Tue 9 Dec Install and upgrade Security release · KB5071544 · Windows 10, version 1809 +1
• Tue 9 Dec Install and upgrade Security release · KB5071547 · Windows Server 2022
• Tue 9 Dec Install and upgrade Security release · KB5072033 · Windows 11, version 24H2 +2

November 2025

• Wed 19 Nov New and changed features Windows news · Microsoft Foundry on Windows Server
• Tue 18 Nov Issues and security Out-of-band release · KB5072359 · Windows 11, version 24H2 +1
• Tue 18 Nov New and changed features Windows news · Introducing Windows Admin Center: Virtualization Mode (vMode)
• Tue 11 Nov Install and upgrade Security release · KB5068787 · Windows Server 2022
• Tue 11 Nov Install and upgrade Security release · KB5068791 · Windows 10, version 1809 +1
• Tue 11 Nov Install and upgrade Security release · KB5068861 · Windows 11, version 24H2 +2
• Tue 11 Nov Install and upgrade Security release · KB5068864 · Windows 10, version 1607 +1

October 2025

• Thu 23 Oct Issues and security Out-of-band release · KB5070881 · Windows 11, version 24H2 +1
• Thu 23 Oct Issues and security Out-of-band release · KB5070882 · Windows 10, version 1607 +1
• Thu 23 Oct Issues and security Out-of-band release · KB5070883 · Windows 10, version 1809 +1
• Thu 23 Oct Issues and security Out-of-band release · KB5070884 · Windows Server 2022
• Mon 20 Oct Issues and security Out-of-band release · KB5070773 · Windows 11, version 24H2 +2
• Tue 14 Oct Install and upgrade Security release · KB5066586 · Windows 10, version 1809 +1
• Tue 14 Oct Install and upgrade Security release · KB5066782 · Windows Server 2022
• Tue 14 Oct Install and upgrade Security release · KB5066835 · Windows 11, version 24H2 +2
• Tue 14 Oct Install and upgrade Security release · KB5066836 · Windows 10, version 1607 +1

Sorted from how each source classifies its records: what's-new pages, releases, documentation changes, notices, roadmap items, and network changes. A kind is a reading aid, not Microsoft's own category.