NEW YORK - NOVEMBER 30: (NO SALES, NO ARCHIVE) In this handout photo provided by Microsoft, Microsoft Corp. Chief Executive Officer Steve Ballmer (C) and CFO Chris Liddell( L) ring the opening bell of the Nasdaq with NASDAQ President and CEO Robert Greifeld (R) as they announces the business availability of the Windows Vista operating system, the 2007 Microsoft Office system, and Exchange Server 2007 at the Nasdaq Market November 30, 2006 in New York City. This is the first simultaneous release of Microsoft's flagship products since the joint launch of Windows 95 and Office 95 more than a decade ago. The year 2006 also marks the 20th anniversary of Microsoft since its listing day on March 13, 1986.