[Dovecot] folders are not under INBOX

[Ondrej Svoboda]

hi guys,
I hope it's common trouble, but I'm not able to find a solution:

- i'am using courier imap and trying to migrate to the dovecot
- on courier I have all folders as subfolder of Inbox - i.e. Inbox.Sent

but on dovecot the folder Sent is not subfolder of Inbox, but its on the
same level.

Please is there some possibility to have the subfolders the same
behaviour as in courier? we have lot's of customers so after the upgrade
the folders can't change.

thank you
ondrej