High Quality Content by WIKIPEDIA articles! MSN Explorer is a web browser, developed by Microsoft, that integrates MSN and Windows Live features such as Windows Live Hotmail and Windows Live Messenger with a web browser. To make use of these services requires a Windows Live ID (formerly known as a Microsoft Passport or .NET Passport). MSN Explorer is essentially a graphics-heavy version of Internet Explorer, and could be termed an Internet Explorer shell: this means it is a Trident based browser.