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Security Update, December 6, 2001 (Outlook Express 5.5)

This update resolves the "Outlook Express Restricted Sites zone bypass and file extension spoofing" security vulnerability in Outlook Express 5.5, and is discussed in Microsoft Security Bulletin MS01-058. Download now to prevent a malicious user from causing an attachment, when you open it, to be identified by a different name and extension.

This vulnerability could, in one scenario, enable an attacker to identify an executable file as a text file, so the file appears safe to open.

For more information about this vulnerability, read Microsoft Security Bulletin MS01-058. (This site is in English.)

System Requirements
This update applies to Outlook Express 5.5.

How to use
Restart your computer to complete the installation.

How to uninstall
Uninstall is not available.

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