Windows Phone 7 is the only version of Windows Phone that features a kernel based on the Windows Embedded Compact 7 version of Windows Embedded CE, which was also used in Windows Mobile and Pocket PC systems. Support for additional languages and regions were subsequently brought through both the Mango and Tango updates to the OS respectively. Windows Phone initially supported twenty-five languages, with applications being available through Windows Phone Store in 35 countries and regions. Upon the release of Windows Phone 7's "Mango" revision, additional manufacturers became partners, including Acer, Fujitsu, and ZTE. The devices were made available on 60 carriers in 30 countries, with additional devices to be launched in 2011. On October 11, 2010, Microsoft's CEO Steve Ballmer announced the 10 launch devices for Windows Phone 7, made by HTC, Dell, Samsung, and LG, with sales beginning on Octoin Europe and Australia and Novemin the United States. 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.
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