Admins, you've been warned: The clock is ticking on Edge's IE Mode

Microsoft has reminded administrators that Internet Explorer mode in Edge is guaranteed support only through 2029, so it is time to get those legacy migrations moving. Internet Explorer mode lets enterprises continue using legacy websites within Edge rather than relying on the retired Internet Explorer browser. It uses the Trident MSHTML engine from Internet Explorer 11 and permits elements such as ActiveX controls, although other Internet Explorer functionality, such as custom toolbars, is not