Please go through the link.
https://www-secure.symantec.com/connect/sites/default/files/Release_Notes_SEP12.1.2.pdf
You can now install Symantec Endpoint Protection Manager onthe following operating systems:
■ Windows 8
■ Windows Server 2012
You can now install the Symantec Endpoint Protection client on the following operating systems:
■ Windows 8 and Windows Server 2012
■ Mac OSX10.8, Mountain Lion
■ Mac OSX case-sensitive formatted volumes
You can now use Symantec Endpoint Protection Manager from the following browsers:
■ Microsoft Internet Explorer 10
■ Google Chrome, through 22.0.1229.79