Many workers trudge back to the office on the Monday after Thanksgiving, turn on their computers and, instead of working, start shopping for bargains, writes Bill Brenner. That makes "Cyber Monday" the perfect time for hackers to strike, Brenner notes, so IT professionals need to be at the top of their game. He advises turning on all security systems, monitoring networks for unusual activity and training employees to recognize scams and malicious sites.

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