Update for Outlook Junk E-mail Filter (April 2010)
Microsoft has recently released the April update for the Outlook 2003/2007 Junk E-mail Filter.
"This update provides the Junk E-mail Filter in Microsoft Office Outlook with a more current definition of which e-mail messages should be considered junk e-mail."
The update is available for Outlook 2007 and Outlook 2003 or you can use Microsoft Update. As usual the update comes with the corresponding Knowledge Base article: