How to Use Edge IE Mode for Legacy Internal Sites on Windows 11

Quick fix: Open Edge, go to edge://settings/defaultBrowser, set Allow sites to be reloaded in Internet Explorer mode to Allow, then add your internal URLs to the IE mode site list. Restart Edge once and the legacy sites load with the Trident engine while everything else uses Chromium.

Microsoft removed Internet Explorer 11 from Windows 11, but enterprises still run internal sites — payroll portals, expense tools, old SharePoint pages — that depend on ActiveX, VBScript, or document modes that Chromium-based Edge doesn’t support. Edge IE Mode is the supported successor: it embeds the legacy Trident engine inside a single tab so those sites work without keeping a separate browser around.

What causes this

Internal line-of-business apps from the early 2010s often check the browser’s document mode (IE 8, IE 9, etc.) and refuse to render if they see Chromium. Some use ActiveX controls that can’t run outside Trident. Some use VBScript event handlers. None of those work in modern Chromium Edge, which is built on the same engine as Chrome.

IE Mode is a compatibility layer Microsoft maintains as part of Edge. It’s supported through October 2029 and embeds the Trident engine when you visit an explicitly whitelisted URL. The page renders inside Edge with an “IE” badge in the address bar; everything else in the browser stays on Chromium.

Method 1: Enable IE Mode for personal/local use

1. Open Edge and navigate to edge://settings/defaultBrowser.
2. Find Allow sites to be reloaded in Internet Explorer mode (IE mode). Set it to Allow.
3. Click Restart when prompted.
4. Navigate to your legacy site. Click the three-dot menu and choose Reload in Internet Explorer mode.
5. To make the page always open in IE Mode, click the IE badge in the address bar after reloading, then toggle Open this page in Internet Explorer mode next time.

The per-URL toggle expires after 30 days by default. To make sites permanently use IE Mode, use Method 2.

Method 2: Add sites to the IE Mode list via Group Policy

For multiple users or for permanent assignments, use the Enterprise Mode Site List — an XML file Edge reads at startup.

1. Download the Enterprise Mode Site List Manager (Schema v.2) from Microsoft’s site.
2. Open the tool, click Add, and enter your internal URL. Pick IE11 as the open-in browser, and choose the matching document mode (most often IE11 or Default).
3. Save the XML to a network location all your users can read — e.g., \\fileserver\share\IESiteList.xml.
4. Open Group Policy Editor and navigate to Computer Configuration → Administrative Templates → Microsoft Edge → Configure the Enterprise Mode Site List.
5. Set the policy to Enabled. Enter the path to the XML file.
6. Run gpupdate /force, then close all Edge windows and reopen. Visit a whitelisted URL — it loads in IE Mode automatically.

The site list reloads when Edge starts. To force a manual reload during testing, open edge://compat/enterprise and click Force update.

Method 3: Set IE Mode policies for a single PC without GPO

If you don’t have Group Policy access, you can set the same policies via registry on a per-machine basis.

1. Open regedit and navigate to HKLM\Software\Policies\Microsoft\Edge. Create the key if missing.
2. Create a String value named InternetExplorerIntegrationLevel and set it to 1 (IE Mode allowed).
3. Create a String value named InternetExplorerIntegrationSiteList and set it to the full path of your XML file: file://C:/IESiteList.xml (forward slashes intentional).
4. Close Edge entirely, then reopen.
5. Test by visiting a whitelisted URL.

This produces the same result as Method 2 but doesn’t require Pro/Enterprise. For Home edition users, registry is the only path.

How to verify the fix worked

• Visit a whitelisted internal URL. The IE icon appears in the left side of the address bar.
• Right-click the page and choose View page source. The source view should look like the legacy IE source format.
• Open edge://compat/enterprise and confirm your XML file is loaded and the URL entries are listed.

If none of these work

If IE Mode appears to load but the page still renders as if in modern Edge, your document mode override isn’t applying — check the XML and make sure the docMode attribute matches what the legacy site expects (often IE8 or IE9). If ActiveX controls fail with security warnings, you need to add the site to Trusted Sites in Internet Options (run inetcpl.cpl); IE Mode honors those zones. For the rare case where IE Mode itself won’t start, run sfc /scannow and then reinstall Edge from https://www.microsoft.com/edge — the IE Mode binary lives inside Edge and a broken install affects both.

Bottom line: IE Mode is the only supported way to run legacy intranet apps on Windows 11. Set the site list once via GPO or registry, and users see the right engine without thinking about it.