MC1473151 - Microsoft Edge: IE mode is supported through at least the end of 2029, plan your migration

Microsoft 365 Message Center announcement MC1473151.

Message Center ID

MC1473151

Category

plan For Change

Severity

normal

Services

Microsoft 365 suite

Tags

User impact, Admin impact

Published

2026-09-16

Last updated

2026-09-16

Expires

2030-01-31

[What and why] Internet Explorer (IE) mode in Microsoft Edge remains supported through at least the end of 2029, as first announced in 2021. Microsoft is sharing this reminder so admins can plan migrations for legacy websites and applications that still depend on IE mode. Application modernization projects can take years to complete depending on the number and complexity of dependencies, so early planning reduces the risk of disruption later. [Rollout schedule] This is a reminder, not a rollout of a new feature or capability. IE mode support continues through at least the end of 2029 across Worldwide, GCC, GCC High, and DoD environments. Microsoft will provide at least one year of notice before retiring IE mode. [Impact on your organization] Who is affected Organizations that use IE mode in Microsoft Edge for legacy websites or applications Organizations that do not use IE mode are not affected. Platforms and services Microsoft Edge What will happen If your organization does not use IE mode, there is no impact and no action is required. If your organization uses IE mode, you can continue using it while you modernize affected websites and applications. The Internet Explorer desktop application has been retired. Legacy websites and applications can continue to run through IE mode in Microsoft Edge. Support for IE mode continues through at least the end of 2029, but modernization projects may take years to complete. This message does not change your current IE mode configuration or require you to disable IE mode immediately. It is intended to help you identify dependencies and plan migration work before the end of the current support period. [Action required and recommendations] If your organization no longer uses IE mode in Microsoft Edge, no action is required. If your organization still depends on IE mode: Inventory your IE mode dependencies. Identify the business-critical websites and applications that still require IE mode. Review your existing Enterprise Mode Site List and current usage to build your inventory. Assess modernization options. Determine whether each application should be updated, rehosted, replaced, or rebuilt using modern technologies and services. Request assistance if needed. Microsoft App Assure provides no cost assistance for eligible customers experiencing application compatibility issues with Microsoft Edge and IE mode. Planning early can help your organization identify migration risks and reduce the likelihood of disruption as you move away from IE mode dependencies. Learn more Microsoft App Assure: App Compatibility Support | Microsoft 365 Lifecycle FAQ - Internet Explorer and Microsoft Edge | Microsoft Learn [Compliance considerations] No compliance considerations identified, review as appropriate for your organization.