Windows Phone 7
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 State.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 Window Live Sky Drive access. 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.
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 in 2013 to include some of the features from Windows Phone 8. The update included a tweaked start screen, additional color schemes, and more wallpaper options.
Windows Phone 8
Windows Phone 8.1
Windows Phone 8.1 was announced on April 2, 2014, after being released in preview form to developers on April 10, 2014. New features added include a notification center, Internet Explorer 11 with tab syncing among Window 8.1 devices and WP devices, separate volume controls, and the option to skin and add a third column of live tiles to the Start Screen. Starting with this release, Microsoft has also dropped the requirement that all Windows Phone OEMs include a camera button and physical buttons for back, Start, and Search.Windows Phone 8.1 also adds Cortana, a voice assistant similar to Siri and Google Now. Cortana replaces the previous Bing search feature, and was released as a beta in the United States in the first half of 2014, before expanding to other countries in late 2014 and early 2015.
Windows 10 Mobile
Windows 10 Mobile emphasizes software using the Universal Windows Platform, which allows apps to be designed for use across multiple Windows 10-based product families with nearly identical code and functionality, and adaptations for available input methods. When connected to an external display, devices can also render a stripped-down desktop interface similar to Windows on PCs, with support for keyboard and mouse input. Windows 10 Mobile also features Skype messaging integration, updated Office Mobile apps, notification syncing with other Windows 10 devices, Microsoft Edge web browser, and other user interface improvements. Microsoft is also developing middleware known as Windows Bridge to allow iOS Objective-C and Android C++ or Java software to be ported to run on Windows 10 Mobile with limited changes to code.
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