Please click here to find more information. Mac OS X 10.7.0 was released on July 20, 2011 as a new feature release of Mac OS X. It included the following changes over OS X 10.6: * Address Book now uses an iPad-like user interface. It also includes improved Yahoo support and FaceTime calling. * AirDrop – Lion-to-Lion direct file sharing via Wi-Fi Direct. No wireless access point required. * Address space layout randomization – Address space layout randomization (ASLR), a security technique that puts important data in unpredictable locations, making it harder to target known weaknesses, is available for 32-bit applications, and "has been improved for all applications", in Lion. * Apple Push Notification Service – Send over-the-air alerts, such as news updates or social network