New Junk E-mail Filter definitions have been made available for Outlook 2003, Outlook 2007 and Outlook 2010. It looks like Outlook 2013 is skipping this month.
Download: Update for Microsoft Office Outlook 2003 Junk E-mail Filter (KB2810049)
Download: Update for Microsoft Office Outlook 2007 Junk E-mail Filter (KB2768021)
Download: Update for Microsoft Office Outlook 2010 Junk Email Filter (KB982726)
If you have Microsoft Update configured to also update other Microsoft applications, then this update will also also be offered via Microsoft Update or has already been updated automatically for you.