Happy 50th birthday to mogul Bill Gates. The computer geek and Harvard's most famous drop-out joined forces with Paul Allen to found Microsoft in 1974 and sold the MS-DOS operating system to IBM. Both men now number among the world's richest people. Their corporation went on to create the Windowsoperating systems and became the world's largest producer of software for microcomputers. The Bill and Melinda Gates Foundation donates millions of dollars to global health care, education, libraries and the Pacific Northwest.