Mac OS X (10.7) - OS X Lion Overview

In July 2011 Apple released an updated version of the Mac OS X operating system called 10.7 or OS X Lion. Lion provides users with a number of new features, including deeper integration of multitouch and purely electronic sales via the Mac App Store.


Apple has pro a summary of Lion's key new features at as well as a detailed list of new features at

The minimum system requirements for OS X 10.7 are currently expected to be:

  • Mac computer with an Intel Core 2 Duo, Intel Core i3, Intel Core i5, Intel Core i7, or Xeon processor (Lion will NOT work on PowerPC machines or early Intel Macs with a Core Duo processor)
  • 2GB of memory
  • 4 GB of disk space for downloading Lion from the App Store
  • A working internet connection to download from the App Store
  • Latest version of Mac OS X Snow Leopard (10.6.8)
  • If you are attempting to upgrade to Lion from a different version of Mac OS X you must first upgrade your system to Snow Leopard. Copies of Snow Leopard can be purchased at either the Techstore or directly from the Apple Store.
  • Mac App Store installed

Noteworthy changes to OS X Lion

  • OS X Lion will most likely only be available as a download via Apple's App Store. DVDs will not be available for purchase from Apple.
  • FileVault, Apple's method for encrypting sensitive information on a Mac, has been updated so that it supports encrypting the entire hard-drive. This is a change from the way FileVault previously worked, where it only encrypted your home directory.
  • Rosetta, a service that allowed older Mac applications designed for PowerPC to run on newer Intel Macs, will be removed in OS X Lion. As a result, some older applications will not work correctly with Lion. Please see Mac OS X (10.7) - Possible compatibility issues with OS X Lion for a list of applications used at UW-Madison that may have compatibility problems.

Keywords:mac apple osx lion 10.7 os x appstore app store   Doc ID:19063
Owner:System U.Group:Advanced Desktop Support
Created:2011-07-06 19:00 CDTUpdated:2011-10-17 09:15 CDT
Sites:Advanced Desktop Support, DoIT Help Desk
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