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Using the exploit, a hacker could create a Web site that stores information in the browser's cache that would take the Internet user to a different Web address or domain. The hacker also could deliver this "Web object" in Hypertext Markup Language (HTML)-formatted e-mail either opened by the user or simply displayed in Outlook Preview. Outlook Express 6 and Outlook 2002 are not vulnerable to this exploit when used in their default configurations.