A.4. Safari

In August 1997, a momentous deal was struck: Microsoft would invest $150 million in Apple, and in return, Apple would make Internet Explorer the default web browser for its Mac OS operating system for the next five years. Less than six months later, IE 4.0 for the Mac was released.

When IE 5.0 was released for the Mac in March of 2000, it was a breakthrough web browser, with excellent support for web standards—support, actually, that was way ahead of the Windows version of IE at the time—and innovative features that, again, the Windows version lacked (and still does!). Over the next few years, though, real work on the Mac IE browser pretty much stalled, as Microsoft contented itself with bug fixes and maintenance releases, culminating in the 5.2.1 release of July 2002. After that, nothing.