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 http://www.apple.com/macosx/whats-new/ as well as a detailed list of new features at http://www.apple.com/macosx/whats-new/features.html.
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)
- 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 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.