Apple posted a free download of the Mac OS X 10.5.6 update Monday with significant fixes that "enhance the stability, compatibility and security" of its Mac computers. The update is for users of Mac OS X Leopard 10.5 to 10.5.5.
With more than 30 fixes in this update, Apple warned Mac users to be careful if they have modified the operating system or moved Apple applications outside the default Applications folder. The new system can be downloaded as an automatic update or in a standalone installer.
Mac OS X 10.5.6 also makes changes to Apple's Mail, iChat, MobileMe, iCal, AirPort and Safari applications. Apple said the update improves synchronization of applications and fixes an issue where users may not see printers.
The update improves the reliability of AirPort network connections and fixes some problems with the iChat application. Graphics issues are also fixed, including gaming performance.
Apple said MobileMe now synchronizes contacts, calendars and bookmarks within a minute of a change being made. A complete list of the issues the update addresses is on Apple's Web site.