Mac OS X 10.5.7 shows few changes at first glance, while your Mac's Software Updater only reveals that the latest incremental update to Leopard is recommended for all users running Mac OS X Leopard, as it includes general operating system fixes that enhance the stability, compatibility and security of your Mac.

On a more particular note, Apple reveals that Mac OS X 10.5. includes the following General changes:

– Includes latest security fixes.
– Includes additional RAW image support for several third-party cameras.
– Improves performance of video playback and cursor movements for recent Macs with NVIDIA graphics.
– Resolves an issue with Dvorak keyboard layout in Mac OS X 10.5.6.
– Improves the reliability and accuracy of Unit Converter, Stocks, Weather and Movies Dashboard widgets.
– Addresses a situation that may cause issues when logging into Gmail.
– Improves reliability when syncing contacts with Yahoo!.
– Expansion Slot Utility for Mac Pro now reports the correct PCIe slot configuration.
– Improves network performance when connected to certain Ethernet switches that have Flow Control enabled.
– Improves stability for network home directories hosted by Mac OS X Server v10.4.
– Improves Finder search results for network volumes that may not support Spotlight searching, such as Mac OS X Server v10.4, Time Capsule, and third-party AFP servers.
– Includes several improvements to Directory Service and Client Management.

Areas like iCal, Mail, Parental Controls and Printing have been updated as such:

iCal
– Improves overall reliability with CalDav.
– Improves reliability when automatically syncing with MobileMe.

Mail
– Addresses reliability and sync issues with Notes.
– Addresses an issue that may cause the BCC field to populate incorrectly when redirecting a message from the Sent mailbox.

Parental Controls
– Improves consistency with Parental Controls and application restrictions.
– Addresses an issue in which time limits may not work properly with full-screen games and Fast User Switching.

Printing
– Resolves an issue that may cause certain third-party printers to print to the incorrect paper tray.
– Non-admin user accounts can now be allowed to add and remove printers by enabling Parental Controls and selecting "Can administer printers."
– Includes other printing reliability and stability improvements.

According to Apple, the Mac OS X 10.5.7 Update is recommended for all versions of Mac OS X 10.5 through 10.5.6. The delta update lets you update from Mac OS X 10.5.6 to 10.5.7. A combo installer lets you update from Mac OS X 10.5, 10.5.1, 10.5.2, 10.5.3, 10.5.4, 10.5.5, or 10.5.6 to 10.5.7. All versions of the 10.5.7 Leopard update, including the combo and security (2009-002) standalone installers are available for free download below.

Download Mac OS X 10.5.7 Client

Download Mac OS X 10.5.7 Server

Download Mac OS X 10.5.7 Combo Update Client

Download Mac OS X 10.5.7 Combo Update Client Server

Download Apple Security Update 2009-002