Safari is a web browser developed by Apple Inc. and included with the Mac OS X and iOS operating systems. First released as a public beta on January 7, 2003 on the company's Mac OS X operating system, it became Apple's default browser beginning with Mac OS X v10.3 "Panther". Safari is also the native browser for iOS. A version of Safari for the Microsoft Windows operating system, first released on June 11, 2007, supports Windows XP, Windows Vista, and Windows 7. According to Net Applications, Safari accounted for 62.17 percent of mobile web browsing traffic and 5.43 percent of desktop traffic in October 2011, giving a combined market share of 8.72 percent. Safari is the fourth most popular web browser, behind Internet Explorer (49.59 percent), Mozilla Firefox (21.20), and Google Chrome (16.60).