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

🚨 The Signal: Microsoft is reminding organizations that Internet Explorer (IE) mode in Edge will be supported until at least the end of 2029. This provides time to migrate legacy applications and websites, reducing future disruption and security risks associated with outdated technologies.

The Impact

Organizations relying on IE mode face a future security risk if legacy applications are not modernized, potentially exposing them to vulnerabilities.

  • Security Teams: Risk of unpatched vulnerabilities in legacy applications if not modernized.
  • Admins: Operational disruption if legacy applications fail post-2029 due to lack of IE mode.
  • Developers: Need to prioritize modernization of legacy web applications.
  • Business Owners: Potential for business process interruption if critical applications are not updated.

The Action

  1. Identify all applications and websites currently relying on IE mode in Microsoft Edge.
  2. Assess the criticality and complexity of identified legacy applications for modernization planning.
  3. Develop a comprehensive migration strategy and timeline for modernizing or replacing IE mode dependent applications.
  4. Communicate the IE mode deprecation timeline and migration plan to relevant stakeholders.
  5. Begin modernization efforts for legacy applications, prioritizing high-risk or business-critical systems.

Domain: M365-Apps · Impact: medium · Workload: M365 Apps · Essential Eight: User Application Hardening · ISM: ISM-1412, ISM-1485, ISM-1486, ISM-1542, ISM-1585, ISM-1667, ISM-1668, ISM-1669, ISM-1670, ISM-1823, ISM-1824, ISM-1859, ISM-1860