Microsoft Internet Explorer is a legacy web browser developed by Microsoft and included with Windows operating systems from 1995 through the 2010s. It was the dominant browser during the early commercial web era and is still referenced today because of its historical impact and later security challenges.
Although Internet Explorer is no longer the primary browser for most users, understanding its role helps explain modern browser competition, security standards, and how Microsoft transitioned to Edge based on Chromium. The following sections highlight key aspects of its design, support history, and practical implications.
| Aspect | Details | Current Status |
|---|---|---|
| Initial Release | August 1995 with Windows 95 | Discontinued for most users |
| Major Versions | IE 6, 7, 8, 9, 10, 11 | End of support reached for older versions |
| Default Browser | Windows from 1998 to 2015 | Replaced by Microsoft Edge on Windows |
| Modern Compatibility | Limited support for current web standards | Not recommended for general use |
Core Technology and Rendering Engine
MSHTML and Trident Overview
Internet Explorer relies on the proprietary MSHTML rendering engine, also called Trident, to parse HTML and CSS and render web pages inside the browser window. This architecture was tightly coupled with Windows components for many years.
Compatibility Features and Document Modes
To support legacy line-of-business applications, Internet Explorer includes document modes and enterprise compatibility features that emulate older rendering behavior. These options allow IT administrators to control how pages are interpreted in intranet environments.
Security History and Patching
Vulnerability Trends
Over time, Internet Explorer has been associated with numerous security vulnerabilities due to its aging codebase and reduced investment in modern security defenses. These issues led to frequent patch cycles and, eventually to end-of-life decisions.
Enhanced Security Mode and Protected Mode
Later versions introduced Protected Mode and Enhanced Security Configuration, which restrict the browser's access to system resources to reduce the impact of malicious websites and downloads.
Performance and Standards Support
JavaScript and CSS Limitations
Compared with contemporary browsers, Internet Explorer generally exhibits slower JavaScript performance and limited support for modern CSS features, which can lead to degraded user experiences on complex websites.
Hardware Acceleration and Graphics
Starting with Internet Explorer 9, the browser added hardware-accelerated graphics and improved standards compliance, but these enhancements arrived later than in competing browsers and do not fully match current expectations.
Enterprise Adoption and Management
Group Policy and Deployment
In business environments, Internet Explorer can be deployed and configured through Group Policy, allowing organizations to control security settings, add trusted sites, and manage add-ons at scale.
Compatibility View and Enterprise Mode
Microsoft provided Compatibility View and later Enterprise Mode Site List Manager to help organizations keep using legacy web applications that rely on older rendering behavior.
Key Takeaways and Recommendations
- Understand that Internet Explorer is a legacy browser with limited modern standards support.
- Use compatibility tools only when necessary for internal applications, and avoid general web browsing.
- Migrate to Microsoft Edge or other current browsers for improved security, performance, and feature support.
- Leverage enterprise management tools to control Internet Explorer usage and reduce attack surface in managed environments.
FAQ
Reader questions
Why is Internet Explorer still present on some Windows machines even though it is outdated?
It remains on certain Windows installations for backward compatibility with internal business applications that were built for older rendering engines and require Internet Explorer to function.
Can I completely remove Internet Explorer from my computer to improve security?
On most modern Windows versions, you cannot fully uninstall the underlying components, but you can disable Internet Explorer and cease using it, reducing exposure to known vulnerabilities.
What are the main differences between Internet Explorer and Microsoft Edge?
Microsoft Edge uses a modern Chromium foundation, offers better performance and standards support, receives regular security updates, and includes features like vertical tabs and integrated tracking prevention that Internet Explorer lacks.
How can developers test websites for Internet Explorer if they need to support it?
Developers can use virtual machines, Microsoft Edge's built-in Internet Explorer mode, or legacy testing platforms to verify functionality and identify rendering issues for older compatibility requirements.