Apple's OS X Mountain Lion (version 10.8) is due to be released next month, and its latest Developer Preview shows a new addition meant to keep its users secure: the automatic security check feature.
This new capability - "OS X Security Update Test 1.0" - will make the OS contact Apple's servers on a daily basis or every time the machine is started, download and automatically install updates, thus ensuring that the users always have the latest patches.
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http://www.net-security.org/secworld.php?id=13166