Kurt Shintaku's Blog

May 2005 Update for Outlook 2003 Junk Email Filter (KB894384)
This optional update provides the Junk E-mail Filter in Microsoft Office Outlook 2003 with a more current definition of which e-mail messages should be considered junk e-mail. This update was released in May 2005.

http://www.microsoft.com/downloads/details.aspx?FamilyId=4B63C14D-F613-4A4D-A24D-E19C18882244&displaylang=en