Microsoft Outlook 98 E-mail Security Update updates Outlook 98 to help protect you against most viruses spread via e-mail attachments. This security update provides protection from most viruses, such as the ILOVEYOU and Melissa viruses, as well as other viruses that spread themselves through e-mail, or worm viruses that can replicate through Outlook. This update limits certain functionality in Outlook to provide a higher level of security\; it was not created to address a security vulnerability within Outlook. This update provides unprecedented security protection for Outlook and Microsoft encourages all users of Outlook 2000 and Outlook 98 to install the appropriate update for their version of Outlook.