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Metadata at Sep 16, 2026

Message ID

MC1473151

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Published

Sep 16, 2026

Service

Microsoft 365 suite

Tag

User impact
Admin impact
View the latest version See what changed since this version

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

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What changed since this version

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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

Compliance considerations

No compliance considerations identified, review as appropriate for your organization.

Snapshot from Sep 16, 2026

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

Compliance considerations

No compliance considerations identified, review as appropriate for your organization.