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entry for Security Update for Windows XP (KB911567)
. This update should not be uninstalled.Vulnerability details this update fixed:"A remote code execution vulnerability exists in Outlook Express when using a Windows Address Book (.wab) file that could allow an attacker who successfully exploited this vulnerability to take complete control of the affected system.
If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less affected than users who operate with administrative user rights."