Mac OS X 10.5.7 Combo Update
About Mac OS X 10.5.7 Combo Update
The 10.5.7 Update is recommended for all users running Mac OS X Leopard version 10.5 to 10.5.6, and includes general operating system fixes that enhance the stability, compatibility and security of your Mac.
For detailed information on this update, please visit this website: http://support.apple.com/kb/HT3397
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For detailed information on Security Updates, please visit this website: Apple Security Updates