Overview OS X Mountain Lion.

Apple Inc released OS X Mountain Lion version 10.8 for Macintosh computer on July 25, 2012. This operating system can be used on desktop and server operating system computer. In this new OS X Mountain version 10.8, Apple added some new features and some features were replaced with iPhones, iPads and iPod touches operating system. It also includes the latest version of the Safari web browser, Safari 6.

System requirements
1.       2 GB of RAM.
2.       8 GB of available hard disk or solid state storage.
3.       To upgrade from an old version of OS X, the computer must be running at least v10.6.8.

The following models are officially supported

1.       iMac (Mid 2007 or newer)
2.       MacBook (Late 2008 Aluminum, or Early 2009 or newer)
3.       MacBook Pro (Mid/Late 2007 or newer)
4.       MacBook Air (Late 2008 or newer)
5.       Mac Mini (Early 2009 or newer)
6.       Mac Pro (Early 2008 or newer)
7.       Xserve (Early 2009)

The following models support AirPlay Mirroring

1.       iMac (mid-2011 or newer)
2.       Mac Mini (mid-2011 or newer)
3.       MacBook Air (mid-2011 or newer)
4.       MacBook Pro (early 2011 or newer)

The following models support AirDrop

1.       MacBook Pro (late 2008 or newer)
2.       MacBook Air (late 2010 or newer)
3.       MacBook (late 2008 or newer)
4.       iMac (early 2009 or newer)
5.       Mac Mini (mid-2010 or newer)
6.       Mac Pro (early 2009 with AirPort Extreme card or newer)
New and changed features

Application updates

1.       Chess — app now supports Game Center.
2.       Dashboard — widgets can be managed in a UI similar to Launchpad.
3.       Game Center — adopted from iOS.
4.       Mail — new VIP feature, to save frequent contacts.
5.       Messages — a multi-protocol instant messaging and texting client (replacing iChat); supports the iMessage service. Also available on Mac OS X 10.7 "Lion" as a beta version.
6.       Notes — new notes application, now separate from Mail in its own application, with support for desktop notes added.
7.       Notification Center — a desktop version similar to the one introduced in iOS 5. Application pop-ups are now concentrated on the corner of the screen, and the Center itself is pulled from the right side of the screen.
8.       Preview — new app featuring an improved user interfaces. Ability to fill out forms in PDF documents that don't contain actual PDF form fields.
9.       Reminders — new to-do list application, now separate from Calendar in its own application.
10.   Safari 6 — new release, features a new omnibar; a combination of the address bar and the search field. The omnibar also has a "Reader" button, showing the user just the text of the article without advertisements and distraction. When the user is on a website with no article, the button is disabled.Safari 6 also available as a download for Mac OS X Lion.
11.   Time Machine — able to do rotating backups on more than one storage medium.[18]

Other major updates

1.       AirPlay Mirroring — wireless mirroring of a Mac's screen to an Apple TV.
2.       Chinese features — new additional features for users in China, including support for Baidu as an option for Safari search engine, QQ, 163.com and 126.com services for Mail, Contacts and Calendar, Youku, Tudou and Sina Weibo are integrated into share sheets.
3.       Dictation — system-wide.
4.       Facebook — full integration, following an update in late 2012.
5.       Gatekeeper — an anti-malware feature based on digital signatures and the Mac App Store.
6.       Power Nap — allows a MacBook Air (Mid 2011 or newer) or a MacBook Pro with Retina display to synchronize with iCloud while sleeping. Power Nap also allows a Mac to download App Store and OS X updates as well as make periodic Time Machine backups when it is plugged in and sleeping.
7.       Screensavers — new ones added.
8.       Share Sheets — a "Share" button and dialog box in Safari and other applications.
9.       Twitter — full integration from within most apps.

Other minor updates

1.       App updates — apps automatically install from the Mac App Store.
2.       iCloud library UI integration — includes new Open and Save dialog boxes across built-in applications, iWork and third-party applications via an API. Applications that make use of this API support a new user interface to view and manage documents in the cloud that are specific to the application being used.
3.       Document renaming — documents can now be renamed from the title bar.
4.       Document synchronization — iWork documents automatic synchronize with iCloud.
5.       Full screen ability on any display.

User interface changes

1.       Dock — has received an updated look, emulating the appearance of the aluminum metal surface that much of Apple’s current hardware line-up sports.
2.       Scroll bars widen when the mouse hovers over them.
3.       Finder displays a progress bar in the "size" column when copying a file, and on icons in Launchpad when downloading from the Mac App Store.
4.       Launchpad — now has Spotlight search for finding applications.

Renamed applications

1.       “Address Book” renamed "Contacts".
2.       “iCal” renamed "Calendar".

Dropped and changed features

1.       iChat — replaced by Messages and FaceTime.
2.       MobileMe — replaced entirely by iCloud, specifically in System Preferences options.
3.       RSS support in Mail and Safari has been removed; a message is shown to suggest to users that they search the Mac App Store for an RSS app.
4.       Software Update — has been unified into the MacApp Store. The list of updates installed in the past has been removed.
5.       Web Sharing — option removed from System Preferences. Apache is still included with the operating system and can be enabled using third-party software.
6.       X11.app — users are directed to the open source XQuartz project instead.
7.       Xgrid — support has been removed (including in OS X Server edition).
8.       Display Preference Menu — replaced by Airplay icon, and it is no longer possible to quickly switch resolutions without first opening up preferences.
9.       Battery life — option in Menu Bar to display with Time no longer offered. Instead, the only option is to display battery Percentage. However battery time can still be viewed in the dropdown by clicking on the battery icon.
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