In April 2014, at the Build Conference, Microsoft's Terry Myerson unveiled an updated version of Windows 8. 1 that added the ability to run Windows Store apps inside desktop windows and a more traditional Start menu in place of the Start screen seen in Windows 8. The new Start menu takes after Windows 7's design by using only a portion of the screen and including a Windows 7-style application listing in the first column. The second column displays Windows 8-style app tiles. Myerson said that these changes would occur in a future update, but did not elaborate. Microsoft also unveiled the concept of a "universal Windows app", allowing Windows Store apps created for Windows 8. 1 to be ported to Windows Phone 8. 1 and Xbox One while sharing a common codebase, with an interface designed for different device form factors, and allowing user data and licenses for an app to be shared between multiple platforms. Windows Phone 8. 1 would share nearly 90% of the common Windows Runtime APIs with Windows 8. 1 on PCs.