This is untested but based on some of my own code that parses attachments...

use Mail::POP3Client;
use MIME::Parser;

usage() unless scalar @ARGV == 3;

my $pop = new Mail::POP3Client( HOST        => $ARGV[0],
                                USER        => $ARGV[1],
                                PASSWORD    => $ARGV[2] );

my $tmp_directory = "/tmp";
my $parser = new MIME::Parser;
$parser->output_dir($tmp_directory);
$parser->output_prefix("attachment");
$parser->output_to_core();

for (my $i = 1; $i <= $pop->Count(); $i++){
  my $head = $pop->Head($i);
  if ($head =~ /X-MS-Has-Attach: yes/i){
    my $msg = $pop->HeadAndBody($i);
    #$pop->Delete($i); # uncomment if you want to delete the message
    my $entity = $parser->parse_data($msg);
  }
}

$pop->Close();

sub usage {
    print "Usage: $0 <mail_server> <username> <password>\n";
    exit;
}
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