malware could evade the firewall's control of network traffic. Previous versions did not identify the tests because none carried a malicious payload. Another test was conducted using Core Impact, which successfully exploited one vulnerability on the test computer. However, other components of Norton stopped the exploit from causing harm. The other attempts were unsuccessful either because the system was invulnerable or Norton's Intrusion Prevention System stopped it. Attempts to disable the firewall were unsuccessful by PC Magazine. On the contrary, PC Pro identified 15 open ports on a computer with Norton installed. In PC Magazine testing, Norton completely detected most malware. For two-thirds of the samples, all traces were removed. Norton found and removed all the commercial keyloggers. A full scan took nearly an hour to complete though, twice as long as the 2007 version. The suite blocked most of the malware from installing and all the commercial keyloggers, regardless of any modifications made to the samples. PC World noted that Norton removed 80 percent of malware-associated files and Registry entries. Spam filtering imported users' address books to compile a whitelist of allowed senders. Addresses to which users send mail and e-mail tagged as valid mail could be automatically added to the whitelist. Using several thousand messages, PC Magazine found that Norton marked over 40 percent of valid e-mail as spam. Over 80 percent of valid newsletters were marked as spam. Norton did correctly identify 90 percent of spam e-mail. 2009 (16.x) The 2009 version was released for sale September 9, 2008. Symantec set several goals while in development: complete installations in under a minute and a footprint of 100 MB. Average installation times ranged from eight to ten minutes, and the previous 2008 version had a 400 MB footprint. Other goals included reducing load time after the computer starts, from 20 to 30 seconds to 10 seconds, and file scanning times with technology that allowed Norton to skip certain trusted files. The technology works on the basis that if a piece of software runs on a significant proportion of computers, then it was safe. A reduction in memory consumption was made, prompted by the fact 40 percent of people contacting Symantec support had 512 MB of RAM. The beta release used about 6 MB of memory, compared to 11 MB by the prior version. To reduce scan times, Norton Insight used data from Norton Community participants to avoid scanning