Microsoft's launch of Windows 10 to the general public on July 29 will be accompanied by the opening of the unified Windows Store. Developers who have created apps using Microsoft's Universal Windows Platform (UWP) framework will be able to submit them to the new Windows Store on that same day.
Mary Jo Foley of ZDNet broke the news after confirming the information with Microsoft. While most existing apps for Windows 8.1 will continue to work and be available to download in the new storefront, July 29 will be the first day that developers can start uploading their new UWP-based apps. Foley writes:
"UWP applications, thanks to .NET Native, will be able to start up roughly 30 percent faster and have a memory footprint of 15 percent less. In order to gain these kinds of benefits, developers will need to retarget their existing Windows Store/Universal apps to Windows 10. (Those building line-of-business apps that will be sideloaded also will get the same kinds of performance benefits via .NET Native, Microsoft officials said.)"
These apps are designed so they can run, without any code changes, on any Windows 10-based device. That includes smartphones that run Windows 10 Mobile, and the upcoming HoloLens headset. The Xbox One will also be able to use these apps when it gets its Windows 10 dashboard update later in 2015.