How can i get outlook to filter out junk mail that is already in my inbox?

N

number10

I've just upgraded to outlook 2003 but i have about 1000 emails in my inbox. How can i get outlook to scan these emails for junk email and move them to the junk email folder. With the old outlook i could run the junk email rule, but i can't find this option in 200

Can anyone help?
 
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