Apple has finished polishing the last details for its Mac OS X 10.5.6 update, making it available for public consumption via its Software Update utility today. The update improves Safari compatibility with Web proxy servers, offers improved reliability of Time Machine with Time Capsule and fixes a bug that could cause Time Machine to state the backup volume could not be found.

In addition, MobileMe subscribers will finally get nearly instant synchronization of their contacts, calendars, and bookmarks in every device linked to their accounts and online at – instead of having a lag of as long as 15 minutes. A full list of the issues addressed with 10.5.6 can be found here. As usual, the latest update can be downloaded from the software update mechanism in Mac OS X or from the company’s website as a standalone file.