diff --git a/root/etc/e-smith/templates/usr/share/mozilla-mcd/thunderbird.conf.php/10All b/root/etc/e-smith/templates/usr/share/mozilla-mcd/thunderbird.conf.php/10All
index 127106d..13f154d 100644
--- a/root/etc/e-smith/templates/usr/share/mozilla-mcd/thunderbird.conf.php/10All
+++ b/root/etc/e-smith/templates/usr/share/mozilla-mcd/thunderbird.conf.php/10All
@@ -4,7 +4,7 @@ use esmith::util;
 
 my $ldapbase = esmith::util::ldapBase ($DomainName);
 
-my $pref = ((${'mozilla-mcd'}{'TBEnforce'} || 'disabled') eq 'enabled') ? "lockPref":"defaultPref";
+my $pref = ((${'mozilla-mcd'}{'TBEnforce'} || 'disabled') =~ m/^enabled|on|1|yes$/) ? "lockPref":"defaultPref";
 
 $OUT .=<<"EOF";