Mac OS X Guides

To start off, let's make sure that we refer to it correctly.  As you can see, it's made of up the letter "O", the letter "S", and the Roman Numeral "X".  It is pronounced as "Mac O-S-Ten."
Mac OS X took the Mac OS to the next level.  As a more modern, stable, secure operating system it implements some of the following key features common to UNIX-based operating systems:
Mac OS X has been designed with three key isolation features: System Isolation, User Isolation, Memory and Application Isolation.  This guide is a brief overview of the article Key Isolation Features in Mac OS X at our main site and is specific to the Library Folders.
Leopard, also known as Mac OS X Leopard, is the current release version of Apple's Mac OS X operating system that runs on the company's Macintosh computers.  Leopard was released on October 26, 2007.  Leopard has been designated a version number of 10.5 and is the 6th version OS X version that Apple has released since early 2001. Leopard contains more that 300 new features when compared to Tiger, the prior version of Mac OS X.
This guide will describe the process of upgrading to Mac OS X Leopard.  This guide will describe at a high level the step involved in a Mac OS X upgrade.  If this will be your first ever Mac OS X upgrade, you'll want to pay close attention.  Before we get started, we'd like to point out that you will want to verify the system requirements as outlined by Apple.  If you have a recent Mac, you'll shouldn't have any problems upgrading to Leopard.
Snow Leopard, also known as Mac OS X Snow Leopard, is the current release version of Apple's Mac OS X operating system.  Mac OS X is the operating system that runs on Apple's Macintosh computers.  Snow Leopard was released on August 28, 2009 twenty-two months after the release of Mac OS X Leopard (version 10.5), the prior generation of the operating system.  Snow Leopard has been designated a version number of 10.6 and is the seventh iteration of the Mac OS X operating system.
Lion also known as Mac OS X Lion, is the next iteration of the Mac OS X operating system for Apple's Macintosh line of computers. Lion was officially unveiled by Apple during the 2011 WWDC keynote address on June 6, 2011.  Lion will be released in July 2011, less than two years after the Mac OS X Snow Leopard which was released in August 2009.  Lion has been designated a version number of 10.7 and is the eight iteration of the Mac OS X operating system.