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"You will not see price upgrades for additional security in our software," Microsoft spokesman Rick Miller said.
The clarification came after Microsoft chief technical officer Craig Mundie commented at the RSA Conference on tech security that the company may offer new security capabilities on a paid basis.
Mundie was referring to the possibility that Microsoft may offer security products "separate and distinct" from Microsoft's core products down the road, Miller said.
The spokesman added that Microsoft has invested some $100m (£64m) in its Trustworthy Computing initiative to provide customers with added security within their products.