While jointly developing a new OS with IBM in 1984, OS/2, Microsoft released Microsoft Windows, a graphical extension for MS-DOS, on November 20. Microsoft moved its headquarters to Redmond on February 26, 1986, and on March 13 the company went public; the ensuing rise in the stock would make an estimated four billionaires and 12,000 millionaires from Microsoft employees. Due to the partnership with IBM, in 1990 the Federal Trade Commission set its eye on Microsoft for possible collu
sion; it marked the beginning of over a decade of legal clashes with the U.S. Government. Microsoft announced the release of its version of OS/2 to original equipment manufacturers (OEMs) on April 2, 1987; meanwhile, the company was at work on a 32-bit OS, Microsoft Windows NT, using ideas from OS/2; it shipped on July 21, 1993 with a new modular kernel and the Win32 application programming interface (API), making porting from 16-bit (MS-DOS-based) Windows easier. Once Microsoft informed IBM of NT, the OS/2 partnership deteriorated. Microsoft introduced its office suite, Microsoft Office, in 1990. The software bundled separate office productivity applications, such as Microsoft Word and Microsoft Excel. On May 22 Microsoft launched Windows 3.0 with a streamlined user interface graphics and improved protected mode capability for the Intel 386 processor. Both Office and Windows became dominant in their respective areas. Novell, a Word competitor from 1984–1986, filed a lawsuit years later claiming that Microsoft left part of its APIs undocumented in order to gain a competitive advantage.
On July 27, 1994, the U.S. Department of Justice, Antitrust Division filed a Competitive Impact Statement that said, in part: "Beginning in 1988, and continuing until July 15, 1994, Microsoft induced many OEMs to execute anticompetitive "per processor" licenses. Under a per processor license, an OEM pays Microsoft a royalty for each computer it sells containing a particular microprocessor, whether the OEM sells the computer with a Microsoft operating system or a non-Microsoft operating system. In effect, the royalty payment to Microsoft when no Microsoft product is being used acts as a penalty, or tax, on the OEM's use of a competing PC operating system. Since 1988, Microsoft's use of per processor licenses has increased."
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