[Dovecot] Missing folders

[John Moorhouse]

I've recently had a oops with the system I was running dovecot on so 
have had to move it to a new machine, I've been able to retrieve the 
mbox files from the old machine, built the new machine and over wrote 
the new mbox files with the old one in maildir, connecting to the server 
via imap woeks but I can only see the mail in the inbox from the old 
mbox files, emails in sub directories (the sub directories arn't there), 
is there some command I need to run to get it to pass the mbox file to 
find the folders or it there another file I need to transfer form the 
old machine.

(I'm assuming that all the emails for a user, including those in 
subfolders are within the single mbox file, particularly as I'm is very 
large)

Thanks

John