Upgrading to Leopard
Volume licensing is available to organizations seeking 10-99 licenses ($120 each), 100-999 licenses ($110 each), and 1,000 or more licenses ($100 each). Mac OS X 10.5 Leopard Server Client volume pricing is also available for 10-99 servers ($450 per license), 100-999 servers ($400 per license), and 1,000 or more servers ($350 per license).
Specific feature requirements
Leopard also brings a list of feature-specific requirements that must be met to take advantage of the new technologies. These include an additional hard drive for Time Machine -- Apple's new backup software that uses a timeline-like layout to track as well as preserve changes to data -- and an iSight camera (either built-in or external) to make use of Photo Booth. Using Photo Booth requires a G5 or better processor to run at all, but only Macs equipped with Intel Core Duo or faster processors can make use of the software's Backdrop effects.
Users looking to install Microsoft Windows on their Mac in order to boot to either Mac OS X or Windows need to install Apple's Boot Camp software, which requires an Intel-based Mac and Windows XP Service Pack 2 or Windows Vista. Apple's Developer tools require 1GB of memory and an additional 3GB of storage space.
Front Row multimedia software requires a Mac with built-in IR (Infrared) and an Apple Remote, while the company's DVD Player software requires a 1.6GHz or faster processor for improved de-interlacing. iChat requirements vary based on preferred feature usage: