Windows 7 (formerly codenamed Blackcomb and Vienna) is the current version of Microsoft Windows and the successor to Windows Vista. Microsoft has stated that it is "scoping Windows 7 development to a three-year timeframe", and that "the specific release date will ultimately be determined by meeting the quality bar." The first public beta was released to the public on January 9th, 2009 and will expire August 1st, 2009, with a downloadable ISO available to the first 2.5 million people. The operating system was finally made available to the public on October 22nd 2009.