
As its original name was criticized for being too complex and "wordy", the name of the operating system was officially shortened to just Windows Phone 7 on April 2, 2010. HP later decided not to build devices for Windows Phone, citing that it wanted to focus on devices for its newly purchased webOS. The final SDK was made available on September 16, 2010. Microsoft officially unveiled the new operating system, Windows Phone 7 Series, at the Mobile World Congress in Barcelona on February 15, 2010, and revealed additional details at MIX 2010 on March 15, 2010.


It was succeeded by Windows Phone 8, which was released on October 29, 2012. Microsoft ended support for Windows Phone 7 on January 8, 2013, and for Windows Phone 7.5 on October 14, 2014. It received multiple large updates, the last being Windows Phone 7.8, which was released in January 2013 and added a few features backported from Windows Phone 8, such as a more customizable start screen. Windows Phone 7 is the first release of the Windows Phone mobile client operating system, released worldwide on October 21, 2010, and in the United States on November 8, 2010. Windows Phone 7.5: unsupported as of October 14, 2014 Windows Phone 7: unsupported as of January 8, 2013.

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