For security reasons, Apple has updated the Leopard (Mac OS X 10.5) and Windows (XP SP2 and later) versions of QuickTime to version 7.7, addressing 13 security issues. The update is not available to Macs running OS X 10.6 or later, as the security fixes in this update have already been addressed in OS X 10.6.7, 10.6.8 and later releases. Apple recommends the update for all QuickTime users on Windows or Mac OS X Leopard 10.5.8.
