Any of Symantec's corporate customers got quite the scare on Friday night, when Symantec's automatic security servers sent warning of a level 4 alert. Symantec uses a 1-4 scale for threats, 1 for minor inconvenience, 4 for what Neowin calls a "full-scale internet meltdown". Symantec has rarely issued even a level 3, and has never issued a level 4 alert. However, the careful reader would have seen this line of text at the bottom of the E-mail, buried in a sea of hyperlinks.
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Soon afterwords, Symantec released an official statement, saying that the level 4 alert was merely a test.