[Dovecot] Convert UW folders to Dovecot folders ?

Hello

IMAP users here have a *lot* of folders living in their mailhub home directory

Converting the INBOX doesn't seems to be a problem I've found scripts that do the job :-)

But

How to convert IMAP folders from UW format ( one file / folder ) to dovecot format which seems much more sophisticated.

Does anyone has written such ( nice) utility ?

Thanks a lot

Frank