Available worldwide on July 18 for all Windows 8 PCs and Tablets. Available worldwide on July 18 for compatible Windows Phone 8 devices, except in the U.S. where the Windows Phone 8 version is available only on Verizon Wireless until August 16. On Windows Phone 8, 1GB RAM currently required. Version supporting 512MB RAM Windows Phone 8 coming August 2013. Performance on 512MB phones may vary.