--- a/dovecot-example.conf	Fri Jul 22 15:42:57 2005 +0300
+++ b/dovecot-example.conf	Fri Jul 22 17:20:44 2005 +0300
@@ -429,6 +429,13 @@
   #     workaround makes sure that Netscape never breaks by adding the line if
   #     it doesn't exist. This is done only for FETCH BODY[HEADER.FIELDS..]
   #     commands. Note that RFC says this shouldn't be done.
+  #   tb-extra-mailbox-sep:
+  #     With mbox storage a mailbox can contain either mails or submailboxes,
+  #     but not both. Submailboxes-only-mailbox is created by CREATE box/
+  #     command. Thunderbird unfortunately keeps the extra slash also for
+  #     SUBSCRIBE, UNSUBSCRIBE and DELETE commands, causing Dovecot to fail
+  #     with "Invalid mailbox name" error. This workaround strips away the
+  #     extra slash.
   #imap_client_workarounds = outlook-idle
 }