Internet Explorer 3

Internet Explorer 3. Released by Microsoft in August 1996, it was the first major competitor to Netscape Navigator in the Browser wars. The browser introduced support for Cascading Style Sheets and ActiveX controls, significantly advancing web technology. Its integration with the Windows 95 desktop and bundling with the Microsoft Plus! pack were pivotal in its rapid adoption.

Development and release

The development of Internet Explorer 3, codenamed "Athens," was a direct and aggressive response to the dominance of Netscape Communications Corporation in the early web. Under the leadership of Thomas Reardon, the team at Microsoft worked to rapidly incorporate emerging web standards. It was officially launched on August 13, 1996, for Windows 95 and Windows NT 4.0, with versions for Windows 3.1x and Mac OS following shortly after. A significant strategic move was its inclusion as a free component in the Microsoft Plus! pack for Windows 95 and later as part of the OEM Service Release 2, challenging the prevailing model of paid browsers like Netscape Navigator.

Features

Internet Explorer 3 introduced a suite of features that expanded the capabilities of the World Wide Web. It was the first mainstream browser to support the emerging Cascading Style Sheets (CSS) standard, allowing for greater design control. Support for ActiveX controls enabled interactive content and integration with other Microsoft technologies like Visual Basic. The browser also included Internet Mail and News, a built-in email client, and early support for Java applets via the Microsoft Java Virtual Machine. Other notable additions were the Internet Explorer Administration Kit for corporate deployment and improved support for HTML tables and frames.

System requirements

To run Internet Explorer 3, users needed an IBM PC compatible system with an Intel 80386 processor or higher for the 16-bit version on Windows 3.1x. The 32-bit version for Windows 95 and Windows NT 4.0 required an Intel 80486 or better. A minimum of 8 MB of RAM was necessary, along with approximately 15 MB of free disk space. The Mac OS version required a Motorola 68030 processor, System 7.0.1, and 8 MB of RAM. These requirements were modest for the era, facilitating broad installation on contemporary hardware from manufacturers like Compaq and Dell.

Market impact and legacy

Internet Explorer 3 marked a turning point in the Browser wars, capturing nearly 30% of the market by early 1997 and eroding the lead of Netscape Navigator. Its free distribution and deep integration with Windows 95 set a precedent that would later become central to the United States v. Microsoft Corp. antitrust case. The browser's technological contributions, particularly in CSS and ActiveX, influenced the development of future web standards and Microsoft's own Component Object Model (COM) architecture. Its success established Internet Explorer as a dominant platform, directly paving the way for the feature-rich Internet Explorer 4.

Security and vulnerabilities

As one of the first complex, integrated web browsers, Internet Explorer 3 introduced new security challenges. Its support for ActiveX controls created a vector for malicious code, as these components had extensive access to the Windows system. The browser's handling of Java applets and JavaScript also presented risks, leading to some of the earliest documented cross-site scripting concerns. While it included basic security zones to manage trust levels for different sites, these were rudimentary. Over its lifespan, several vulnerabilities were disclosed, highlighting the growing security focus in web software that would become critical for later versions and competitors like Mozilla Firefox.