Symantec Mail Security has links in it for updating it, and it has a LiveUpdate that only updates definitions. Anyway - the method for updating Symantec Mail Security v 6 is to go to licensing.symantec.com. Then log in, and click on "get software." Enter the appropriate serial number (obtained during your original install - you probably have an email from when you first installed it that has this). Then you can download the 300+ MB file and install it over the existing installation.