Below I have pasted some code that seems to work for setting the \Seen flag to a Cyrus IMAP store, however when looking at the store through mutt or Outlook the messages have not had the \Seen flag attached. Does anyone know why or see something I have wrong?

#!/usr/bin/perl

#$Id$
# copied from cyrus_expunge.pl
# given a date on the command line
# select all messages in all folders before that date
# set the \Seen flag on all selected messages

# :!perl -d % -v three days ago
# :!perl -d % -v yesterday midnight
# :!perl -d % -v two hours ago
# :!perl -d % -v '12/07/07'

use Date::Manip;
use Mail::IMAPClient;
use IO::File;
use Getopt::Std;

# parse the command line
our($opt_v, $opt_s) = (0, 0);
getopts('sv') or die "usage: $0 [-vs]";
$opt_s = 1 if $opt_v;

my $start = time;

# parse the command-line date
my $bdatestr = join(' ', @ARGV);
my $bdate = ParseDate($bdatestr);
my $bsecs = UnixDate($bdate, '%s');

# Change the following line (or replace it with something better):
my($h, $u, $p) = ('imap.example.com', 'cyrus','secret');

my $imap = Mail::IMAPClient->new(
                    Server => "$h",            # imap host
                    User    => "$u",            # $u,    
                    Password=> "$p",            # $p,
                    Uid    => 1,                # True value
                    Port    => 143,                # Cyrus
                    Debug    => 0,                # True value
                    Buffer    => 4096*10,            # True value
                    Fast_io    => 1,                # True value
                    Timeout    => 30,                # True value
                    Debug_fh=> IO::File->new('>/tmp/imap.out'),    # f
+handle
                ) 
or die "$@";
my $rfc2060date = $imap->Rfc2060_date($bsecs);

our($folder, $nchanged) = ('', 0);
our($nfolders, $nmessages, $ntotchanged) = (0, 0, 0);

for my $f ( $imap->folders ) {
    $folder = $f;
    next unless $f =~ /user.user.sales/oi;
    $nfolders++;
    unless ($imap->select($f) ) {
        $imap->setacl($f, $u, 'lrswipcda') or warn "$0: Cannot setacl 
+for $f: $@\n" and next;
        $imap->select($f) or warn "$0: Cannot select $f: $@" and next;
    }
    my @msgs = $imap->before($rfc2060date);
    my $messages_before = $imap->message_count($f);
    if(defined($messages_before)) {
        $imap->see(@msgs) or warn "$0: cannot set \\Seen flag on messa
+ges in folder '$f': $@";
        $nchanged = scalar(@msgs);
        $ntotchanged += $nchanged;
    }
    write if $opt_v;
}

# write a summary
if($opt_s) {
    my $stop = time;
    print "\nSummary:\n";
    print "Elapsed Seconds: ", ($stop - $start), "\n";
    print "Total Folders: $nfolders\n";
    print "Total Messages: $nmessages\n";
    print "Total Changed: $ntotchanged\n";
}

format STDOUT =
@<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @>>>>>
$folder,                                                  $nchanged
.

format STDOUT_TOP =
Folder                                                    Purged
--------------------------------------------------------- ------
.
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