"I was recently reminded while troubleshooting a friend's small business network of where most computer systems' real security weaknesses lie. Where do you think it is? The desktop operating system, which was Windows XP SP3? The server operating systems, which were Windows Server 2003 SP2 and Novell's SLES (SUSE Linux Enterprise Server) 11 SP1? Or, the Sonicwall TZ 210 firewall appliance?