New research suggests that Apple's App Store is populated by many zombie programs which get next-to-no downloads. However Apple has said that 90% of all apps in the market - which is marking its five-year birthday - are downloaded at least once a month. Apple boss Tim Cook supposed the store had "fundamentally changed the world".
Speaking to app developers at the firm's recent developer's discussion, the chief executive said: "Customers love the buying knowledge and they love your incredible apps and they have now downloaded 50 billion apps. It defines zombies as apps which never come out in Apple's master-list of the most downloaded apps wide-reaching a chart which runs to over 300,000 places.