September 14, 2026—KB5129243 (Monthly Rollup) Out-of-band

September 14, 2026—KB5129243 Monthly Rollup Out-of-band Applies To Windows Server 2012 R2 ESU Important The installation of this Extended Security Update ESU might fail when you try to install it on an Azure Arc-enabled device that is running Windows Server 2012 R2. For a successful installation,...

2026-09 Update for Windows Server 2012 R2 for x64-based Systems (KB5129243)

2026-09 Update for Windows Server 2012 R2 for x64-based Systems KB5129243...