Microsoft has posted the April 2010 Windows Mail and Outlook Junk E-Mail Filter data files to their download center for the X86 and X64 versions of the definitions.
Install this update for to revise the definition files that are used to detect e-mail messages that should be considered junk e-mail or that may contain phishing content.
This download is available to customers running genuine Microsoft Windows. Click the Continue button in the Validation Required section above to begin the short validation process. Once validated, you will be returned to this page with specific instructions for obtaining the download.