<P> On June 1, 2015, Microsoft announced that Windows 10 would be released on July 29, 2015 . Microsoft began an advertising campaign centering on Windows 10, "Upgrade Your World", on July 20, 2015 with the premiere of television commercials in Australia, Canada, France, Germany, Japan, the United Kingdom, and the United States . The commercials focused on the tagline "A more human way to do", emphasizing new features and technologies supported by Windows 10 that sought to provide a more "personal" experience to users . The campaign culminated with launch events in thirteen cities on July 29, which celebrated "the unprecedented role our biggest fans played in the development of Windows 10". </P> <P> Windows 10 harmonizes the user experience and functionality between different classes of device, and addresses shortcomings in the user interface that were introduced in Windows 8 . Windows 10 Mobile, the successor to Windows Phone 8.1, shares some user interface elements and apps with its PC counterpart . </P> <P> The Windows Runtime app ecosystem was revised into the Universal Windows Platform (UWP). These universal apps are made to run across multiple platforms and device classes, including smartphones, tablets, Xbox One consoles, and other compatible Windows 10 devices . Windows apps share code across platforms, have responsive designs that adapt to the needs of the device and available inputs, can synchronize data between Windows 10 devices (including notifications, credentials, and allowing cross-platform multiplayer for games), and are distributed through Microsoft Store (rebranded from Windows Store since September 2017). Developers can allow "cross-buys", where purchased licenses for an app apply to all of the user's compatible devices, rather than only the one they purchased on (e.g., a user purchasing an app on PC is also entitled to use the smartphone version at no extra cost). </P> <P> On Windows 10, Microsoft Store serves as a unified storefront for apps, video content, and ebooks . Windows 10 also allows web apps and desktop software (using either Win32 or . NET Framework) to be packaged for distribution on Microsoft Store . Desktop software distributed through Windows Store is packaged using the App - V system to allow sandboxing . </P>

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