Supporting applications display a new button at the top right of application window, this button opens applications in full-screen mode. Full-screen apps – Native, system-wide support for full-screen applications running in their own space.Duplicate font files are now flagged with a warning icon, and can be fixed automatically or resolved manually. Font Book 3-Font Book 3 now provides more flexible displays of character glyphs supplied by a particular font face.The navigation sidebar lost the ability to show the specific icon of a map or volume (by default there is a hack to still add the old ability), instead it shows a grey standard map icon. Finder improvements – Finder search allows multiple search criteria to be specified without creating a smart folder, Finder search offers suggestions, files can be grouped by various attributes, and one can now merge files under two folders with the same name – a prompt will appear asking whether one wants to replace or keep both files.Support for FileVault on external hard drives has also been added. FileVault now offers full disk encryption and added security with XTS- AES 128 data encryption.One must now double-tap with two fingers on a dock icon to initiate single application exposé, or simply right-click or control-click and select Show All Windows. Exposé in the Dock, a way of activating Exposé for a single application from the Dock, a feature added in Mac OS X 10.6, is altered.Emoji support – Apple has added a new Emoji font commonly used in chat to express ideograms.Auto Save – As in iOS, documents in applications written to use Auto Save will be saved automatically so users don't have to worry about manually managing their documents.Auto-correction now behaves much like on iOS devices, displaying an iOS-like popup box.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 OS X 10.6: Mac OS X 10.7.0 was released on July 20, 2011 as a new feature release of Mac OS X. Please click here to find more information.
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