On August 16, 2011, Minecraft: Pocket Edition was released for the Xperia Play on the Android Market as an early alpha version. It was then released for several other compatible devices on October 8, 2011.[92][93] An iOS version of Minecraft was released on November 17, 2011.[94] A port was also made available for Windows Phones shortly after Microsoft acquired Mojang.[95] The port concentrates on the creative building and the primitive survival aspect of the game, and does not contain all the features of the PC release. On his Twitter account, Jens Bergensten noted that the Pocket Edition of Minecraft is written in C++ and not Java, due to iOS not being able to support Java.[96] Gradual updates are periodically released to bring the port closer to the PC version.[97] On December 10, 2014, in observance of Mojang's acquisition by Microsoft, a port of Pocket Edition was released for Windows Phone 8.1.[98]