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The only version of Minecraft being currently updated is the Beta version, which was first released in December 2010. Minecraft was developed for about a week before its public release on May 17, 2009, on the TIGSource forums, where it gained a considerable level of popularity. Since then, it has been in constant development, and while still in alpha, managed to gain several hundred thousand sales. Less than a month after the initial beta release, on January 12, 2011, Mojang had sold over a million copies.
Official releases for iOS and Android are currently in development, and are expected for release later in 2011.