At the 2011 Mobile World Congress, Steve Ballmer announced a major update to Windows Phone 7 due toward the end of the year, Windows Phone 7.5, codenamed Mango.[2] The new OS would address many of the platform's shortcomings, including a mobile version of Internet Explorer 9 that supports the same web standards and graphical capability as the desktop version, multi-tasking of third-party apps,[3][4] Twitter integration for the People Hub,[5][6][7] and Windows Live SkyDrive access.[8] Although the OS internally identifies itself as version 7.1, it is marketed as version 7.5 in all published materials intended for end-users.[9][10]