Mac OS X 10.5.7

Mac OS X 10.5.7 was released on May 12, 2009. It included various stability and security increases, but was still not the last update before 10.6. It included the following improvements:

General

 * 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.
 * Improves wireless keyboard and mouse connection performance.

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.

External References
Apple: About the Mac OS X 10.5.7 Update