Microsoft was founded in 1975 by Bill Gates and Paul Allen. It has grown to become the world's largest software maker. Some key events in Microsoft's history include launching the first version of Windows in 1985, which became the most widely used operating system. In the 1990s and 2000s, Microsoft faced antitrust lawsuits over its business practices. However, it continued to evolve its popular products and launched Windows 7 in 2009 and Windows 8 in 2012 to further dominance in the PC market.