Microsoft plans to announce on Thursday a detailed plan to combat a recent wave of security threats, but one executive told CNET News.com things won't change overnight.

"I don't think it is a big bang thing," Microsoft senior vice president Bob Muglia said in an interview on Wednesday. "I think it's an evolutionary, multistep thing."

As earlier reported, Microsoft is moving toward a strategy known as "securing the perimeter," which involves a greater reliance on firewalls and other "shields" to stop hackers from reaching potentially vulnerable PCs. Thus far, Microsoft has focused its efforts on a Trustworthy Computing initiative designed to improve the way the company writes its software as well as on finding flaws and quickly patching them as they are uncovered.

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