Microsoft has released Vista, the long-delayed new version of their Windows operating system. In addition to a more three-dimensional user interface, other improvements advertised by Microsoft include better security, easier creation of multimedia DVDs, and easier networking between multiple computers on a home network. The word "wow" has played a large part in Vista's marketing campaign; according to company chairman (and the world's richest man) Bill Gates, "This 'Wow' thing is a great way of describing what we've got here." The company is also releasing Office 2007, a new version of the collection of programs that include the Microsoft Word word processor and the Excel spreadsheet program.