Spam delivery

Under "System Settings > Module Config > Spam filtering options", if the default delivery for spam is changed, it appears that will only affect new email users. Is there an easy method to update existing users? If not, is this something that handled by procmail (which I should then be able to individually updated)?

FWIW, the reason why I need to change this is because I had originally setup the spam delivery destination incorrectly. The option to "Write to standard spam Maildir ~/Maildir/.spam/" was close to what I wanted, but in order to provide a cleaner look-and-feel to my users in the webmail interface, I wanted the spam folder to show up as "Spam" (matches case of Drafts, Sent, Trash, etc.). I'm assuming I should therefore be using the "Write to mail file under home directory" with the value set to "Maildir/.Spam/". Unfortunately, I had forgotten the trailing slash character and a file was being created instead. Obviously, if I'm understanding this incorrectly, please let me know.

BTW, do you know of any quick methods to convert the spam files I was (incorrectly) having the system create into individual files I could move into the spam folders for the users?

Thanks.