Try Again:Mac OS X Server v10.6.5 (10H575) Update

Apple pulled and then re-released an update for Mac OSX server after a discovery of a vulnerability in memory aliasing in Dovecot which resulted in a user receiving another users email. If your server is using Dovecot for mail then this update is required, otherwise the update can be applied during off-hours mainly due to requiring a restart.

Apple's gerneralized list of fixes:

• - name queries in Web Calendar match against first name, last name and email attributes 
• - improved setup of Podcast Producer service when bound to an Active Directory server
• - preventing Podcast Capture from always storing passwords in keychain
• - reliability of Web Podcast Capture
• - stopping Podcast Producer recordings with remote cameras 
• - reliability of connections between Podcast Producer server with remote cameras
• - Podcast Producer workflows publishing to a wiki page with an Active Directory account
• - synchronization of audio and video output from Podcast Producer workflows which include intro videos or titling or transitions
• - use of "-" character in specifying DHCP Subnets with Server Admin
• - improved Wiki Server connection latency 
• - use of "/" character with Wiki Server mailing lists
• - configuration of iChat Server when changing host names using changeip 
• - preventing automatic changes to a ".local" domain in iChat Server configuration due to DNS unresponsiveness
• - importing of iChat accounts with Managed Preferences
• - preventing network homes being used after mobile accounts enabled
• - corrections to the iCal Preference Manifest
• - viewing of IPP print queues with Workgroup Manager
• - reliability of External Accounts with FAT32 file systems
• - reliability of applying Managed Preferences to Macs that have been idle
• - allowing administrators to bypass Managed Preferences at login
• - improper removal of older updates by Software Update Server
• - using Server Assistant to setup remote servers
• - reliability and logging of Mail Server
• - reliability of Managed Preferences
• - reliability of Web Server with PHP scripts