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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.

Apple states that there are over 250 new or changed features in Lion, including: Other features were announced at the WWDC 2011 keynote or on Apple's Mac OS X Lion Web site after the keynote. Some new features were announced at the 'Back to the Mac' keynote in October 2010, and the Apple website was updated in February 2011 with more details.

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AirDrop is supported on the following Mac models: MacBook Pro (late 2008 or newer), MacBook Air (late 2010 or newer), MacBook (late 2008 or newer), iMac (early 2009 or newer), Mac mini (mid 2010 or newer), Mac Pro (early 2009 with AirPort Extreme card and mid 2010 or newer).

7 GB of free hard drive space is recommended.

Mac OS X 10.6.6 or later (Mac OS X 10.6.8 is recommended).

x86-64 CPU (Macs with an Intel Core 2 Duo, Intel Core i3, Intel Core i5, Intel Core i7, or Xeon processor.).

As of yet, there is no TRIM support for other SSDs. The first developer preview of Lion added TRIM support for SSDs shipped with Macs, which is also included in the latest version of Snow Leopard (10.6.8) shipping with current MacBook Pros before July 20, 2011.

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The Server portion of Lion is available as a separate download from the Mac App Store for US$49.99, which is in addition to the purchase price of Lion itself.

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On August 4, 2011, Apple started to take orders for Mac OS X Lion's USB installation flash drives for $69.99.

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It is not clear whether the USB distribution will support a direct upgrade to Lion from OS X versions prior to Snow Leopard. The only prior version of OS X that supports the Mac App Store is Snow Leopard, which implied that any machines that support Lion currently running Tiger or Leopard would first have to be upgraded to Snow Leopard, as opposed to allowing a direct upgrade to Lion.Īpple later announced two alternative distribution mechanisms for the benefit of users without broadband Internet access: in-store downloads at retail Apple Stores, and a USB flash drive containing the OS, priced at US$69, available through the online Apple Store beginning in August. Instead, the operating system was said to be available exclusively as a download from the Mac App Store for US$29.99. Īpple did not initially announce any physical media distribution for Lion, such as a set of CD-ROMs or a DVD-ROM as used for past releases. The specific release date of July 20 was not confirmed until the day before, July 19, by Apple CFO, Peter Oppenheimer, as part of Apple's 2011 third-quarter earnings announcement. On June 6, 2011, at the Apple Worldwide Developers Conference, it was announced that the official release for Lion would be in July 2011. By October 2011, Mac OS X Lion had sold over 6 million copies worldwide. Apple reported over 1 million Lion sales on the first day of its release. Lion achieved golden master status on July 1, 2011, followed by its final release via the Mac App Store on July 20, 2011. Other developer previews were subsequently released, with Lion Preview 4 (11A480b) being released at WWDC 2011. On February 24, 2011, the first developer's preview of Lion (11A390) was released to subscribers of Apple's developer program.

It brings many developments made in Apple's iOS, such as an easily navigable display of installed applications, to the Mac, and includes support for the Mac App Store, as introduced in Mac OS X Snow Leopard version 10.6.6. Mac OS X Lion (version 10.7 marketed as OS X Lion) is the eighth major release of Mac OS X, Apple's desktop and server operating system for Macintosh computers.Ī preview of Lion was publicly unveiled at Apple's 'Back to the Mac' event on October 20, 2010.