Mac OS X 10.6.4 Update Mac Pro (Mid 2010)... The 10.6.4 update is recommended for all servers currently running Snow Leopard Server version 10.6.3. It includes Wiki Server Update 1.0, Safari 5 and general operating system fixes that enhance the stability, compatibility and security of your server, as well as specific fixes for:

• CalDAV querying of email addresses with Active Directory and Open Directory servers
• Stability and reliability accessing Wiki Server pages
• View movies on Wiki Server with Safari on iPad
• Accessing publicly accessible Wikis when logged in to the Wiki Server
• Listing blogs on Wiki Server
• Vacation mail notices that span across multiple days
• Updates from Software Update Server viewable by clients
• Stability and reliability to Software Update Server synchronization
• Downloading of software updates by Software Update Server
• Creating NetInstall images which include iLife updater packages
• Address issues copying, renaming, or deleting files on SMB file servers
• Improve reliability of VPN connections
• For detailed information about the Mac OS X Server 10.6.4 Update, please visit this website
• For information on the security content of the Mac OS X Server 10.6.4 Update, please visit this website