There were concerns that the planned changes would slow down the Mac OS. But most of all there was skepticism about Apple's intent to make the Mac OS X look and behave more like iOS, the touch firmware for its iPhones and iPads.
Lion, or formally Mac OS X 10.7, was finally released July 20, 2011, with over 250 new features. Those included multi-touch gestures, system-wide support for full screen apps, revamped Mail application, a new way to see easily all running applications and active windows (called Mission Control), the now-built-in Mac App Store (analogous to the iOS App Store for finding and downloading programs), and Launchpad, a full-screen, grid-like display of available applications, which can be re-arranged and grouped into folders.
