how do you remove a deleted user's cyrus mailbox?

Hi everyone,

I am having a little trouble with a user's account on Mac OS X 10.4.8 Server. This is a short description of what has happened.

1. Created a user in WGM.
2. User then sends and recieves lots of email over a long period, with no apparent issues and uses the webmail interface as well as pop3 mail application on home PC (as expected!).
3. User uses webmail one day and discovers a server error in red writing.
4. Semi intelligent server admin guy (me) decides to delete the user account in WGM and then re-create the user in WGM in the hope of deleting the mailbox in the process.
5. Semi intelligent server admin guy discovers that the delete/re-create procedure doesnt remove the mailbox so he decides to search apple support forums.

Hence the reason for this post. Can anybody show me how to delete the mailbox for a user, either in GUI server admin or WGM or even terminal?

Also I have tried adding the diradmin account to the list of cyrus admins in imapd.conf so that the IMAP application can access all mailboxes but I only get read access, so I cant delete it that way, well unless I skipped a step.

Thanks in advance,
Kyran McGlasson