APNS allows Mac OS X Lion and iOS clients to receive push changes to items such as mail, calendar and contacts from a configured OS X Lion Server. Apple Push Notification Service – Send over-the-air alerts, such as news updates or social networking status changes, using Apple's Push Notification service to applications that support APNS.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.AirDrop – Lion-to-Lion direct file sharing via Wi-Fi Direct.It also includes improved Yahoo support and FaceTime calling. Address Book now uses an iPad-like user interface.It included the following changes over Mac OS X 10.6: Mac OS X 10.7.0 was released by Apple on July 20, 2011 as a new feature release ( Mac OS X 10.7 "Lion") of Mac OS X.
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