Internet Explorer shaped how many people first used the web, from early dial-up browsing to business applications built around legacy web technologies. Microsoft marked the browser’s twentieth anniversary in 2015, but the product’s history continued: Internet Explorer 11 became the final major desktop version, and Microsoft later retired its desktop application on certain Windows 10 releases. This is a retrospective, not a guide to using IE today.
From default browser to compatibility tool
Internet Explorer was bundled with Windows for many years and became a common target for websites and enterprise software. As web standards and security expectations evolved, Microsoft shifted its consumer browser strategy to Microsoft Edge. Some organizations still depended on older intranet sites or applications that required IE-specific behavior. For those cases Microsoft introduced IE mode inside Edge to provide backward compatibility while keeping users in the modern browser.
Microsoft states that the IE 11 desktop application ended support on certain Windows 10 versions on June 15, 2022. The retirement announcement encouraged users and organizations to move to Edge, and said IE mode would be supported through at least 2029, with one year’s notice before its retirement. Those details apply to Microsoft’s stated lifecycle and can depend on the Windows version; check the current lifecycle page for updates.
What users should do now
Do not use an unsupported Internet Explorer desktop app for ordinary browsing. If a work application still requires legacy compatibility, ask the organization’s IT administrator whether it is configured in Edge IE mode. Microsoft describes IE mode as an enterprise compatibility feature; it is not a reason to reopen old downloads or disable browser security. Keep Windows and Edge updated and use the supported browser path for the operating system you run.
For a personal PC, open Microsoft Edge and use it as the default browser, or choose another browser that still receives updates. If you find a site that only works in IE, contact the site owner or IT department rather than downloading an unofficial “IE replacement.” Browser compatibility and security support depend on the operating system, so keeping the OS supported matters too.
Why the legacy still matters
IE’s long life left behind websites that were designed for old rendering behavior. That history explains why organizations may need a migration plan instead of a simple browser switch. It also shows the cost of relying on proprietary browser behavior: when software reaches end of support, users face security risk and organizations must modernize dependent systems.
Microsoft’s IE 11 retirement announcement and IE mode FAQ provide current lifecycle guidance. This article does not recommend restoring IE or running it outside supported legacy environments.
