Microsoft Outlook Express Security Update 1

This update resolves the Persistent Mail Browser Link, Cache Bypass, and Malformed E-mail Header security vulnerabilities in Outlook Express. Download now to prevent a malicious user from reading e-mails and files on your computer, or using your computer to send damaging e-mails to others. These vulnerabilities do not give a malicious user the ability to add, change, or delete files on your computer. This update resolves the vulnerabilities in Outlook Express 4.01 Service Pack 2 (SP2) and Outlook Express 5.01 only. Computers running Outlook Express 5.5 are not vulnerable to this issue. Outlook Express 5.5 includes this update.