Microsoft's decision to drop the price of its antivirus software to zero puts rivals such as McAfee and Symantec in a tough position. To be sure, those two--and other rivals--will be able to tout products that offer a broader range of features than Microsoft plans to deliver with "Morro" next year. At the same time, free is a tough price to compete against.
That raises the question of whether those companies or others may look to antitrust regulators for help. We've put queries into those companies and also posed the antitrust question to Microsoft. I'll let you know what we hear back.