"Microsoft Corporation, is a multinational information technology company with global annual revenue of $44.28 billion and 71,553 employees in 102 countries as of July 2006. It develops, produces, licenses licenses and supports a wide range of software products for computing devices. Headquartered in Redmond, Washington, USA, its best-selling products are the Microsoft Windows operating system and the Microsoft Office suite of productivity software, each of which has achieved a near ubiquity in the desktop computer market. Microsoft has footholds in other markets, with assets such as the cable television network MSNBC, the Internet portal MSN and the multimedia encyclopedia Microsoft Encarta. The company also markets both computer hardware products such as the Microsoft mouse, as well as home entertainment products such as Xbox, Xbox 360 and MSN TV" ("Microsoft"). By law, a monopoly cannot exist in the United States. There has been a long debate about whether Microsoft is a monopoly or not? Among other charges, Microsoft was accused of "monopolizing the market for computer operating systems, of integrating the Internet Explorer Web browser into the operating system in an attempt to eliminate competition from Netscape, and of using its market power to enter into anticompetitive agreements with producers of related goods" (SWLearning). First, there are no real barriers to entry in the operating system market. Any company can enter the market and introduce its own operating system. A number of powerful companies have actually done so.