You may find that you have a large spam folder but no way to delete it because it is not being displayed in your e-mail client. This page will show you how to subscribe to your Spam and Viruses folders in Outlook 2002 so that you can clear them out periodically.
First right-click on your Digital Crocus inbox and select 'IMAP Folders'.

Enter a blank query to download your full list of folders.

Select your Spam and Viruses folders and click Subscribe then click OK.
This should make your Spam and Viruses folders visible in Outlook - to clear your Spam folder just select all in the Spam folder (ctrl+a) and press delete.