Microsoft: The operating system application platform has been gradually formed

Microsoft at the Build 2014 conference last night, for the users to show the Win8.1 Update and WP8.1 system. Among them, the two major operating system platforms across Microsoft and the Universal Windows Apps of Xbox One mean that the unification of the Microsoft operating system application platform has gradually taken shape.
David Treadwell, Vice President, Microsoft Operating Systems
David Treadwell, Vice President of Microsoft Operating Systems, announced this new type of application, allowing developers to easily develop applications for all device forms.
With the latest Visual Stuido 2013 Update 2, you can start development. The benefit of unified Windows Runtime is that more code can be reused. Developers are more concerned with optimizing different interfaces for different device forms and interactions. Universal Windows Apps also make sense to consumers. Users in the app store “one-time purchase, cross-platform use”, all data, reminders and in-app purchases are synchronized across the cloud.
Of course, developers can choose the business model that suits them and choose whether to offer them to the user "one purchase" or "independent purchase".