One of my users is using Outlook 2007 SP2 connected to Exchange 2003 SP2. He is running Outlook in Cached Exchange Mode. When he adds an email address to the blocked senders list, incoming emails that match addresses in the list do not go to the Junk E-mail folder. Emails are just delivered to the Inbox. As far as I know, only one user is experiencing this issue. The user does not have any special rules configured and the issue can be reproduced on multiple machines.