[Dovecot] imapc problem

[FUSTE Emmanuel]

hello,

I have some trouble when trying to migrate from another imap server to 
dovecot with imapc/dsync/doveadm.

when running "doveadm -o imapc_user=foo -o imapc_password=bar backup -R 
-u localuser imapc:" all is ok.

But when running "doveadm -o imapc_user=foo -o imapc_password=bar sync 
-R -u localuser imapc:", all local mods are overwritten. For example 
deleting a message or moving it to trash and it reappear in INBOX (and 
disappear from trash if moved there).
If I try without the reverse flag "-R", local delete reappear two times 
after two or more sync.
If I try without the reverse flag "-R", a message moved to trash is 
propagated to trash too, but reappear as many times as you "sync" on the 
two sides in the INBOX.
With other users, first "backup -R"  is ok but on next sync or backup 
try, I get :

dsync(other_user): Error: Mailbox INBOX sync: mailbox_delete failed: INBOX can't be deleted.


Other IMAP server is CriticalPath 8.5.137.

Any clue ??

Emmanuel.

Dovecot conf :

  2.2.12.12 (03196f188677+): /etc/dovecot/dovecot.conf
# OS: Linux 3.11.0-19-generic x86_64 Ubuntu 12.04.4 LTS
auth_master_user_separator = *
auth_username_format = %u
disable_plaintext_auth = no
doveadm_password = ****************
imapc_features = rfc822.size fetch-headers
imapc_host = my_old_imap_server
imapc_user = %u
lda_mailbox_autocreate = yes
listen = *
mail_gid = vmail
mail_location = maildir:~/Maildir
mail_plugins = quota notify replication
mail_prefetch_count = 20
mail_uid = vmail
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave
namespace {
   hidden = no
   inbox = yes
   list = yes
   location =
   prefix =
   separator = /
   subscriptions = yes
   type = private
}
namespace {
   hidden = no
   inbox = no
   list = children
   location = maildir:%%h/Maildir:INDEXPVT=~/Maildir/shared/%%u
   prefix = shared/%%u/
   separator = /
   subscriptions = no
   type = shared
}
passdb {
   args = /etc/dovecot/dovecot-master-ldap.conf.ext
   driver = ldap
   master = yes
}
passdb {
   args = /etc/dovecot/dovecot-ldap.conf.ext
   driver = ldap
}
plugin {
   acl = vfile
   acl_anyone = allow
   acl_shared_dict =file:/appli/vmail/shared-mailboxes
   quota = dict:userquota::file:/appli/vmail/local_userquota/%u/dovecot-quota
   quota_rule = *:storage=100M
   quota_rule2 = INBOX:storage=+20%%
   quota_rule3 = Trash:storage=+10%%
   sieve = ~/.dovecot.sieve
   sieve_dir = ~/sieve
}
protocols = imap sieve
service aggregator {
   fifo_listener replication-notify-fifo {
     user = vmail
   }
   unix_listener replication-notify {
     user = vmail
   }
}
service auth {
   unix_listener auth-userdb {
     group = vmail
     mode = 0660
   }
}
service doveadm {
   inet_listener {
     port = 12345
   }
   user = vmail
}
service replicator {
   process_min_avail = 1
   unix_listener replicator-doveadm {
     mode = 0666
   }
}
ssl = no
userdb {
   args = /etc/dovecot/dovecot-users-ldap.conf.ext
   driver = ldap
}
protocol lda {
   mail_plugins = quota sieve
}
protocol imap {
   mail_plugins = quota imap_quota
}