crosoft moved to its new 4-building corporate campus surrounding "Lake Bill" in Redmond, Washington.
             In 1987 Windows 286 and Windows 386 were announced. Microsoft also announced Windows 2.0 and Microsoft Excel for Windows. In 1988 SQL Server was announced. Microsoft sold its 1 millionth mouse this year. In 1989 Microsoft Word for Windows began shipping.
             Microsoft became the first software company to reach revenues of more than one billion in 1990. During this year Microsoft Windows 3.0 was announced. In just one year, Microsoft shipped four million copies of Windows 3.0 to 24 countries in 12 languages. MS-DOS 5.0 - the first version of MS-DOS featuring a retail upgrade was shipped. Microsoft announced Visual BASIC at Windows World '91. Microsoft also announced new versions of Excel 3.0 . Microsoft Announced the worldwide availability of Windows 3.1 on 6th April,1992.
             In 1993 the number of licensed users of Windows totaled more than 25 million, making Windows the most popular graphical operating syst
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