The 10.4.2 Update delivers overall improved reliability and compatibility for Mac OS X v10.4 and is recommended for all users. It includes fixes for: file sharing using AFP and SMB/CIFS network file services single sign-on authentication and reliable access to Active Directory servers autologin for managed user accounts AirPort and wireless access Core Graphics, Core Audio, Core Image, including updated ATI and NVIDIA graphics drivers Finder updates including finding on Kind and using Slideshow synchronizing your iDisk with .Mac installation reliability managing Dashboard widgets Address Book, Automator, iCal, iChat, Mail, Safari, and Stickies applications compatibility with third party applications and devices For detailed information on this Update, please visit this website: http: http://www.info.apple.com/kbnum/n301722 Get the update here.