
Microsoft announced that support for Internet Explorer (IE) Mode in its Edge browser will end by 2029. If your business relies on legacy web applications that require this mode, you need to start planning. Waiting until the last minute risks security vulnerabilities and operational disruptions.
The Timeline and Immediate Implications
Microsoft's announcement sets a 2029 deadline for IE Mode in Edge. This timeline may seem distant, but transitioning from legacy applications takes time. Businesses still dependent on IE Mode need to evaluate and update their web applications. This is part of Microsoft's broader strategy to phase out older technologies.
Who is Vulnerable?
Any UK SME currently using legacy web applications that depend on IE Mode will be affected. These are typically older systems that haven't been updated to work with modern browsers. To check if you are affected, review your web applications. If they require IE Mode, you will need to update or replace them.
Practical Steps to Take
- Audit Your Applications: Identify which applications rely on IE Mode.
- Consult with Developers: Assess the feasibility of updating or replacing legacy applications.
- Plan a Transition: Develop a timeline for moving to modern solutions, considering both cost and resources.
- Test New Solutions: Before fully transitioning, run pilot tests to ensure compatibility and functionality.
Common Missteps
A pattern we see on most tenants we take on is a reluctance to address legacy systems until the deadline is near. Many businesses underestimate the time and resources required to transition away from outdated technologies. Delaying these updates can lead to rushed decisions and potentially costly mistakes.
Regulatory Considerations
The end of support for IE Mode could have regulatory implications, particularly if your business handles sensitive data. Non-compliance with data protection regulations such as GDPR due to insecure legacy systems could result in fines and reputational damage.
Black Sheep Support's Role
We help SMEs manage these transitions. If your business relies on IE Mode
and we will outline a path to modern, secure web solutions. Not ready to talk yet? Run our free IT Health Check to assess your business risk and security risks in minutes, no commitment.
Our Take
While 2029 may seem far off, transitioning from IE Mode is complex and requires early action. Ignoring this deadline would be, well, not ideal.
Sources
Want this handled for you? See Microsoft 365 support.
Based in Brighton or Hove? We are too: see IT support in Brighton.


