INTERNET EXPLORER FOR MAC
Internet Explorer for Mac (also referred to as Internet Explorer: mac, IE: mac or Internet Explorer Macintosh Edition) was a proprietary web browser developed by Microsoft for the Macintosh platform. Initial versions were developed from the same code base as Internet Explorer for Windows. Later versions diverged, particularly with the release of version 5 which included the Tasman rendering engine.
As a result of the five-year agreement between Apple and Microsoft in 1997, it was the default browser on Mac OS before it was replaced by Apple's own Safari web browser in 2003. Internet Explorer for Mac remained available for download from Microsoft until January 31, 2006. However, no major updates had been released since March 27, 2000, aside from bug fixes and updates to take advantage of new features in Mac OS X.
On June 13, 2003, Microsoft announced that it was ceasing further development of Internet Explorer for Mac. The browser was not included in default installation of Mac OS X v10.4 "Tiger" which was released on April 29, 2005. Microsoft discontinued support for the product on December 31, 2005 and removed the application from their Macintosh downloads site on January 31, 2006. Microsoft recommends "that Macintosh users migrate to more recent web browsing technologies such as Apple's Safari." 
Macintosh, or for newer models, Mac, is a brand name which covers several lines of personal computers designed, developed, and marketed by Apple Inc. The original Macintosh was released on January 24, 1984; it was the first commercially successful personal computer to feature a mouse and a graphical user interface (GUI) rather than a command line interface.
The idea for a personal computer appropriate for the ordinary consumer dates to the late 1970s and an Apple development team was established in 1979. After the success of the original Macintosh in 1984, the company quickly established market share only to see it dissipate in the 1990s as Microsoft came to monopolize personal computing. Apple consolidated multiple, consumer-level desktop models into the 1998 iMac, which sold extremely well and saw the brand name revitalized. Current Mac systems are mainly targeted at the home, education, and creative professional markets. They are the upgraded iMac and the entry-level Mac mini desktop models, the workstation-level Mac Pro tower, the MacBook, MacBook Air and MacBook Pro laptops, and the Xserve server.
Production of the Mac is based on a vertical integration model in that Apple facilitates all aspects of its hardware and creates its own operating system that is pre-installed on all Macs. Apple exclusively produces Mac hardware, choosing internal systems, designs, and prices. Apple does use third party components, however; current Macintosh CPUs use Intel's x86 architecture (formerly the AIM alliance's PowerPC and originally Motorola's 68k). Apple also develops the operating system for Macs, currently Mac OS X 10.5 "Leopard". This is in contrast to most IBM compatible PCs, where multiple vendors create hardware intended to run another company's software. The modern Mac, like other personal computers, is capable of running alternative operating systems such as Linux, FreeBSD, and Microsoft Windows, which is considered to be the Mac's biggest competitor.
INTERNET EXPLORER FOR UNIX
Internet Explorer for UNIX is a proprietary graphical web browser that was freely available and produced by Microsoft for use in the X Window System on Solaris or HP-UX. Development ended with a version of Internet Explorer 5 in 2001 and support for it was completely discontinued in 2002.