Mac OS X (10.7) - OS X Lion Overview

This document provides a general overview of Mac OS X 10.7 (Lion), which was released in 2011.


Apple has a summary of Lion's technical specifications and features here:

For additional support information, please see:

The minimum system requirements for OS X 10.7 are:

  • Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
  • 2GB of memory
  • 7GB of available space
  • A working internet connection to download from the App Store
  • OS X v10.6.6 or later (v10.6.8 recommended)
  • 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 is only available as a download via Apple's App Store. DVDs are not 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 [Link for document 18976 is unavailable at this time.] 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:Leah S.Group:DoIT Help Desk
Created:2011-07-06 18:00 CSTUpdated:2016-11-11 11:29 CST
Sites:DoIT Help Desk
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