Microsoft Edge

Microsoft Edge is a web browser developed by Microsoft. It was created with the aim to replace Internet Explorer as the default browser in Windows 10 and Windows 11. The original version, now called Edge Legacy, is a UWP app using the EdgeHTML and Chakra engines, however, the browser has since been redesigned using the Chromium codebase using the project's Blink and V8 engines. Since the engine switch, new versions of the browser for Windows 7 and later, as well as macOS, Android, iOS and desktop Linux distributions have been introduced.

The Chromium-based Edge replaced Internet Explorer (IE) in Windows 11 for compatibility with Google Chrome.

Edge Legacy
The original Edge (codenamed Spartan) is based on the EdgeHTML rendering engine, a derivative of the Trident engine used by Internet Explorer that removes most legacy functionality, and the Chakra JavaScript engine introduced in Internet Explorer 9. Following the introduction of the new Chromium-based Edge, it is referred to as Microsoft Edge Legacy and is unsupported as of 2021.

Adobe Flash Player and Internet Explorer
Edge featured an integrated Adobe Flash Player (with an internal whitelist allowing Flash applets on Facebook websites to load automatically, bypassing all other security controls requiring user activation) until its removal by January 2021. However, Edge remained alongside Internet Explorer on Windows 10 for compatibility until its removal by 2023.

Chromium version
On 6 December 2018, Microsoft announced a plan to rebuild Edge from scratch, based on Chromium. The plan called for the new Edge to be available for Windows 7, 8.1 and 10, as well as "other platforms like macOS". The first preview version of the new browser was officially released on 8 April 2019, although a build had already leaked two weeks prior. The final version was released on 15 January 2020.

On 17 August 2020, Microsoft announced that the legacy version of Edge would no longer be supported from 9 March 2021 and that they recommend people to switch to the Chromium based version.

Windows 10 build 19041.330 and Windows Server 2022 are the first releases of Windows and Windows Server to include the Chromium-based Microsoft Edge, respectively.

Internet Explorer Mode
Microsoft Edge includes the Internet Explorer Mode, which uses the Trident engine of Internet Explorer 11 to display websites. Edge can be configured to display selected websites in Internet Explorer Mode, if they have trouble with the Blink engine. It is only available for Windows, intended for enterprise usage and to replace the Internet Explorer 11 app on Windows.

Internet Explorer Mode will be supported until at least 2029.