Spam filter does not work?

I am using NIS 2011 on Outlook 2007 & WIndows7. 

I added some domains in Blocked list, but the mails from the domains are still coming to my inbox. Also I can't find spam folder  even send a mail to  "This is Junk" from Norton task bar.  So, I can't confirm if these spam are filtered out or now. Please let me know how to find my spam folder, and how to change the spam folder location. I am not using outlook blocked list (it's empty)