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Q: What is OESU?
A: The Outlook E-mail Security Update (OESU) is a software update for Outlook that provides additional levels of protection against malicious e-mail messages. The update changes the way that attachments are handled by Outlook, and the way that Outlook can be controlled programmatically. OESU applies to Outlook 98 and Outlook 2000. Subsequently, the OESU functionality has been designed into Service Packs 2 and 3 of Office 2000 and into Outlook 2002 and 2003. Here are some details about the OESU releases and updates.

Outlook 98 June 2000 Update
The Outlook 98 E-mail Security Update was released on June 7, 2000. This security update provides protection from many viruses, such as the ILOVEYOU virus and the Melissa virus, as well as other viruses that spread through e-mail, or worm viruses that can replicate through Outlook. For additional information about the Outlook 98 E-mail Security Update, click on Microsoft Knowledge Base article 262617

Outlook 2000 June Update
The Outlook 2000 E-mail Security Update was also initially released in June, 2000. This security update provides protection from most viruses, such as the ILOVEYOU virus and the Melissa virus, as well as other viruses that spread through e-mail, or worm viruses that can replicate through Outlook. For additional information about the Outlook 2000 E-mail Security Update, click on Microsoft Knowledge Base article 262361

If you are using versions of Outlook 98 or Outlook 2000 that need the OESU patch as previously indicated in this article, you can download the OESU at http://office.microsoft.com/downloads/2000/Out2ksec.aspx . OESU functionality has been designed into Service Packs 2 and 3 of Office 2000, and into Outlook 2002 and 2003.

To read about other features included in Microsoft Outlook Express 6 that are designed to protect you against viruses that may be transmitted through e-mail messages, please read Microsoft Knowledge Base article 291387

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