It's FUD Season... it never fails, weeks before Apple is scheduled for major announcements, the tech press spews forth everything it can find to spread Fear, Uncertainty and Doubt about Apple products. Favorite among the FUD options is the "Macs are no more secure than Windows" FUD in which proofs of concept demonstrations are equated with viruses running rampant in the wild, infecting Macs left and right and probably up and down... contrary to fact.
PING!
What's the fix for this? Upgrade to OS X.4.7...
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