Windows Phone 7 was announced at Mobile
World Congress in Barcelona,
Catalonia, Spain, on February 15, 2010, and released publicly on November 8, 2010 in the United States. In 2011, Microsoft released Windows Phone 7.5 Mango. The update included a mobile version of Internet Explorer 9 that supports the same web standards and graphical capability
as the desktop version, multitasking of third-party apps Twitter integration for the People Hub and Windows Live SkyDriveaccess.
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A minor update released in 2012 known as "Tango,
along with other bug fixes, lowered the hardware requirements to allow for devices with 800 MHz CPUs and 256 MB of RAM to run Windows Phone.
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Since Windows Phone 7 devices could not be upgraded to Windows Phone 8 due to hardware limitations Windows Phone 7.8 was released as a stopgap update into include some of the features from Windows Phone 8. The update included
a tweaked start screen,
additional color schemes, and more wallpaper options.
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