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: https://support.apple.com/kb/sp629
For additional support information, please see: https://support.apple.com/lion
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)
- Mac App Store installed
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.
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 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.