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Yesterday, Apple released a new update to Lion. In an effort to not leave those who haven’t migrated to Mountain Lion behind, the OS X Lion v10.7.5 Update provides the new Gatekeeper security feature, improve Wi-Fi reliability for iMacs (models from late 2009 and newer), fixes an issue using Spotlight to search an SMB server, improve compatibility connecting to Active Directory servers (hopefully no more waiting 15 minutes to authenticate to an AD server) and also updating passwords for AD clients, resolve a video issue with some VGA projectors when connected to certain Mac notebooks, plus several other updates and fixes. You can read the entire list of fixes at http://support.apple.com/kb/HT5313?viewlocale=en_US&locale=en_US
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Mac Os X 10.11 Download Free
The fact you are using an older OS lends itself that you are currently not protected as to what Apple feels are the current threats against OS X and have made available to the public with 10.11.6 As for the AV on the Mac it's tantamount to useless. Download antivirus for mac software from Comodo. Free antivirus for mac secures your PC with advanced security solutions and improve security. Free download page for Project NTFS-FREE for Mac OS X's NTFS-free-10.7.5.pkg.This program allows MacOSX to access Microsoft NTFS formatted harddrives connected by USB port. A modified version of the original Linux code, this program is packaged as a easy-to-use installer.
Mac Os X Update
The 10.7.5 update is recommended by Apple for all OS X Lion users.