Internet Explorer 9 Lifecycle & Final Milestones

  • January 13, 2026: Official end of Premium Assurance for Windows Server 2008, marking the absolute final support date for systems where IE9 was a core component.

  • October 14, 2025: Release of the final Cumulative Security Update (KB5066840) for IE9 on specialized Windows Server 2008 environments.

  • July 15, 2024: Microsoft published a critical Maintenance Patch (KB3139929) to resolve boot-level security issues on legacy Vista-era hardware.

  • January 14, 2020: General End of Support for IE9 on Windows 7 and Server 2008 R2, coinciding with the end of life for those operating systems.

  • May 31, 2016: IE9 officially reached the End of Life for mainstream consumers, with Microsoft urging a transition to IE11 and Edge.