Update: The retired, out-of-support Internet Explorer 11 desktop application has been permanently disabled through a Microsoft Edge update on certain versions of Windows 10. For more information, see the Internet Explorer 11 desktop app retirement FAQ. |
Whether you're new to IE mode or are already planning for it, here's a closer look at what's going on under the hood and a sneak peek at enhancements to come.
A month ago, we announced that the future of Internet Explorer (IE) on Windows 10 is in Microsoft Edge and that the Internet Explorer 11 (“IE11”) desktop application will retire and go out of support on June 15, 2022, for certain versions of Windows 10. At the core of this announcement is Microsoft Edge and its dual engine advantage that brings the web together—both modern and legacy—into a single browser experience. Side by side in Microsoft Edge are the Chromium engine to open modern websites and Internet Explorer mode (“IE mode”) to open legacy, IE-based websites.
The best way to understand Internet Explorer mode is to start with its origin story, if you will: it was born of the need to keep critical websites built on older technology running (we call these “legacy sites and apps”), and to run them in the context of today's modern web technology. In the world before Microsoft Edge with Internet Explorer mode, those technologies were clunkily siloed in different browsers; you might have used one browser for one set of tasks, and then needed to switch to the other browser for another set of tasks. Microsoft Edge is your “single browser solution” that brings everything seamlessly together through its dual engine advantage. It's a bit like a hybrid car—you use electric most of the time but can also use gas when you need it.
But this unified experience only works if you feel confident in each engine's compatibility. With IE mode in Microsoft Edge, you can. IE mode's legacy site compatibility works by using the actual MSHTML engine (also referred to as the “Trident” engine) from IE11 to open those legacy websites and applications. While the IE11 desktop application (the interface you interact with to browse the web) will retire next year, the MSHTML engine will not—it will remain a part of Windows and be used to power IE mode. In fact, support for IE mode follows the lifecycle of current and future Windows client, Windows Server, and Windows IoT releases (including Windows 11) at least through 2029, so you can feel confident moving to IE mode as you develop a plan to modernize your legacy websites and applications over the coming years.
By using the MSHTML engine, much of the same site and page rendering functionality found in IE11 is brought forward to IE mode. Document and enterprise modes, Active X controls, and Browser Helper Objects are maintained through the move. Some functionality though is not supported in IE mode such as group policies and settings in IE11 that affect window frames, toolbars, and scrollbars—this is simply because IE mode uses those elements from Microsoft Edge. Here's a handy list of what's supported in IE mode:
Functionality |
Supported? |
All document modes |
Yes |
All enterprise modes |
Yes |
Active X controls (such as Java or Silverlight*) *Microsoft Silverlight will reach end of support on October 12, 2021. For more details, see Silverlight End of Support. |
Yes |
Browser Helper Objects |
Yes |
IE settings and Group Policies that affect the security zone settings and Protected mode |
Yes |
F12 developer tools for IE (when launched with IEChooser) |
Yes |
Microsoft Edge extensions (extensions that interact with the IE page content directly are not supported) |
Yes |
IE toolbars |
No |
IE settings and Group Policies that affect the navigation menu (e.g. search engines, home pages) |
No |
IE11 or Microsoft Edge F12 developer tools |
No |
So how does Microsoft Edge know when to open a site in IE mode versus using the modern, Chromium engine? For organizations, only sites on your Enterprise Mode Site List will open in IE mode. This gives you the flexibility and control to create the best online experience for your users—you can limit use of IE mode to specific sites that need it and for all other sites, they use the faster, more secure, and more modern browsing experience of Microsoft Edge. Like gas in the hybrid car analogy, IE mode is there for just those times when you or your users need to access legacy websites, and the site list is your way to manage that.
Tip: Use your existing Enterprise Mode Site List if you have one. If you used an Enterprise Mode Site List with Microsoft Edge Legacy or with other modern browsers to redirect legacy sites to open in IE11, you can use that same site list to set up IE mode. It’s a great (and quick) way to get started with IE mode. |
If you're wondering how your users will know they are in IE mode, the short answer is, they really won't (and that's by design). The dual engine advantage is a seamless experience for your users—they can fluidly move between modern and legacy sites even within the same tab. The only hint they'll see when in IE mode is a small IE icon in the address bar.
You don't have to take just our word for it though. Since its release, we've seen customers move from IE11 to Microsoft Edge with IE mode with great success. GlaxoSmithKline, a multi-national pharmaceutical organization with 130,000 employees, recently made the switch. John Saenz, head of Modern Workspace at GSK said, “The organization-wide benefit is that with a single browser standard, you know that the experience is the same no matter what department you're in. And you know that if you must provide access to a legacy site, it's going to work.”
Like the Microsoft Edge browser, IE mode will be continually refined to provide the optimal experience for you and your users. Thanks to the incredible partnerships with you and other customers, we've heard your feedback and your desire for updates to the user experience, greater consistency between IE mode and IE11, and new cloud management tools. The first planned batch of enhancements, which land in Microsoft Edge 92 in late July, include:
Tip: Reload websites in IE mode to help with your compatibility testing. Enabling this feature can help accelerate legacy website compatibility testing for your organization. Instead of waiting to add the legacy website to your site list as a first step, you can easily reload the page in IE mode and begin testing. |
And looking ahead to the fall:
Regardless of where you are in the process, we have resources ready to help you move from Internet Explorer 11 to Microsoft Edge.
Tip: If your website or application has a compatibility issue after you test it in IE mode, reach out to our compatibility team, App Assure, for help. If your website or application works in Internet Explorer 11, it should work in Microsoft Edge. Historically, App Assure has seen app compatibility rates of 99.7%, so if you experience a website or application issue after you’ve set up and tested it in IE mode, reach out to the App Assure team for no-cost help remediating the issue. You can submit a request for assistance through their website or reach out to them directly via email at ACHELP@microsoft.com. |
Lastly, we've launched a webinar series to answer questions and help you move from Internet Explorer to Microsoft Edge. Follow @MSEdgeDev on Twitter for information on upcoming webinar dates and how to sign up.
As these new IE mode enhancements become available in Microsoft Edge 92 and beyond, know that we are aiming for a truly seamless browser experience for your users' daily workflow and for simplicity in your browser management. Your feedback on these tools, the user experience, and any part of your journey from IE11 to IE mode is highly valued, so please feel free to submit feedback to us, in the Microsoft Edge app, by leaving a comment here, or through other support channels available to you.
Editor's note: This post is part of the IE to Edge blog series, an ongoing series of articles designed to help you move from Internet Explorer 11 to Microsoft Edge! Each will focus on a different relevant topic to help you in your journey, from what to expect when setting up IE mode to what to expect for end users after the IE11 desktop application retires. Look out for more of these blogs as we journey towards June 15, 2022!
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