The Apple ecosystem continues to grow and thrive and we believe, it's a very important driver of our incredibly strong customer satisfaction and retention, as well as the developer interest and success.
This Sunday marks the 10th anniversary of the introduction of the iTunes Music Store, which revolutionized the distribution of digital content. Today, our iTunes store offer the broadest combination of geographic reach and content depth in the industry, and they surpassed quarterly billings of $4 billion for the first time ever in the March quarter. That's a $16 billion annual run rate making our digital content stores the largest in the world.
The quarter's iTunes billings translated to record quarterly iTunes revenue of $2.4 billion, up 28% from the year ago March quarter with new quarterly revenue records for music, movies and apps. The strong iTunes sales in addition to other services revenue helped us achieve for the first time more than $4 billion in combined quarterly revenue from iTunes, software and services.
We are thrilled with the growth of these revenue streams. To-date, we have music stores in 119 countries offering a combined catalog of 35 million songs; we sell movies in 109 countries offering 60,000 titles; and we have iBooks stores in 155 countries offering 1.75 million iBooks for sale. And with App Stores in 155 countries that encompass almost 90% of the world's population, our developers have created more than 850,000 iOS apps, including 350,000 apps made for iPad.
Cumulative app downloads have surpassed 45 billion and app developers have made over $9 billion for their sales through the App Store, including $4.5 billion in the most recent four quarters alone. Canalys estimate the sales from our App Store accounted for 74% of all app sales worldwide in the March quarter. We believe this is in large part due to the great development environment, broad distribution, large and active user base and seamless integration that the iOS platform offers.
Developers such as BlackFoot Studios have seen explosive growth in their business, thanks to the success of their apps on the iOS platform. With 70 people, this company maintains a growing suite of titles that has seen over 275 million downloads, equating to nearly 5 million daily active users and 34 million monthly active users. With annual App Store sales approaching $100 million, Backflip's iOS sales comprised approximately 95% of the Company's revenues in 2012.
Another tremendous success story is Supercell founded in 2010. Based on Finland Supercell's heyday in Clash of Clans title, available only iOS have been the top gross in iPad games in over 60 countries, helping the Company generate $8.5 million in revenue per employee in 2012.
And in the enterprise, iOS devices have a strong lead over Android. In its most recently published quarterly enterprise device activations report, good technologies found that iOS devices accounted for 77% of all activations by its corporate customers. And thanks to careful App Store curation for the quality of apps, the iOS platform offers a much more secure environment. Recent research by McAfee Labs found that 97% of identified mobile malware was on the Android platform with the remainder primarily on the Symbian and Java ME platforms. But perhaps the most important measure of the success of our ecosystem is how engaged our customers are with our products and services.