Microsoft Sets 2029 Expiration for Internet Explorer Mode in Edge

The warning, delivered via the Microsoft 365 admin center under message ID MC1473151, serves as a long-term buffer for IT departments still clinging to internal tools that refuse to function on modern standards. While the 2029 deadline provides a five-year grace period, the company intends to provide at least twelve months of advance notice before the final sunset occurs. This move continues the slow erasure of Internet Explorer 11, which Microsoft officially retired as a standalone product in June 2022.

IE mode currently acts as an emulation layer within the Chromium-based Edge, tricking older websites into rendering via the discarded Trident engine. For many firms, this remains a critical dependency for legacy intranet portals and archaic administrative software. Microsoft’s directive is explicit: administrators should treat this window not as a reprieve, but as a final opportunity to rebuild or replace incompatible infrastructure before the engine is removed from the Windows ecosystem entirely.