What I can say is that most/all of our Courier users had set "INBOX." as their namespace folder prefix (depends what the client calls it), with the ..
just reading from sidelines, looking at my own inbox (formerly CourierIMAP> D1 > D2) I see some of 'legacy' dir tree folders as so:
... drwx------ 5 vmail vmail 4096 Dec 24 07:09 .Drafts drwx------ 5 vmail vmail 4096 Nov 25 23:27 .ebay drwx------ 5 vmail vmail 4096 Nov 25 23:24 .INBOX.Drafts drwx------ 5 vmail vmail 4096 Nov 25 23:25 .INBOX.Sent drwx------ 5 vmail vmail 4096 Nov 25 23:27 .INBOX.Sent.2008.01 drwx------ 5 vmail vmail 4096 Nov 25 23:27 .INBOX.Sent.2008.02 ...
it all seems to work, BUT, to keep me happy, can I just rename from the shell respective folders to get rid of INBOX where is exists...? or it that a bad idea..?
# cd /etc/dovecot # grep INBOX * dovecot.conf: autocreate = INBOX dovecot.conf: autosubscribe = INBOX
# grep inbox * dovecot.conf: inbox = yes