Update for Outlook Junk E-mail Filter (May 2011)
Microsoft has recently released the May update for the Outlook 2003/2007/2010 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 2003, Outlook 2007 and Outlook 2010 (32-bit, 64-bit) or you can use Microsoft Update. As usual the update comes with the corresponding Knowledge Base article: