for (my $i = int($ibx->art_max/UID_SLICE); $i >= 0; --$i) {
my $sub_mailbox = "$mb_top.$i";
last if exists $mailboxes->{$sub_mailbox};
$mailboxes->{$sub_mailbox} = $ibx;
$sub_mailbox =~ s/\Ainbox\./INBOX./i; # more familiar to users
for (my $i = int($ibx->art_max/UID_SLICE); $i >= 0; --$i) {
my $sub_mailbox = "$mb_top.$i";
last if exists $mailboxes->{$sub_mailbox};
$mailboxes->{$sub_mailbox} = $ibx;
$sub_mailbox =~ s/\Ainbox\./INBOX./i; # more familiar to users