IE Mode has one job inside Microsoft Edge: keeping legacy websites alive now that Internet Explorer is gone. On August 16, 2026, reports surfaced of a Windows 11 bug breaking the very sites that layer exists to protect, a problem Microsoft has confirmed on its Windows release health dashboard. A fix is in progress; there is no workaround and no timeline.
The unknowns outnumber the knowns. Microsoft has not named the update that introduced the problem, which Windows 11 versions are affected, or how many people “some users” covers. The August 11 cumulative updates sit right next to this bug on the calendar, and plenty of admins will suspect them, but no source ties the failure to any specific update. Rolling back patches on a hunch trades a confirmed bug for an unpatched system.
The people who feel this are mostly organizations running legacy internal tools through the Internet Explorer 11 engine: old portals, document systems, hardware dashboards that were never rebuilt for modern browsers. For them, a dead IE Mode tab is a dead application. If you have never clicked “Reload in Internet Explorer mode,” nothing in your browser changes.
One thing this is not: a retirement. Windows 11 itself keeps moving, with 26H2 arriving this month, and IE Mode remains a supported Edge feature that Microsoft has committed to keeping through at least 2029. So the useful moves are short. List which of your sites and tools actually load through IE Mode, so you know your exposure. Leave your site list and policies exactly as they are; the feature is broken, not removed. And if a business-critical app is down, report it through Microsoft support, because logged impact is what moves a fix up the queue.
What to watch: the Windows release health dashboard, where the fix, the affected-version list, and any interim workaround will appear first. Until that entry updates, the honest status is confirmed, unexplained, and unpatched.
