diff --git a/root/etc/e-smith/templates/etc/dovecot/dovecot.conf/65pluginAcl b/root/etc/e-smith/templates/etc/dovecot/dovecot.conf/65pluginAcl
index 72f0305..8a55f83 100644
--- a/root/etc/e-smith/templates/etc/dovecot/dovecot.conf/65pluginAcl
+++ b/root/etc/e-smith/templates/etc/dovecot/dovecot.conf/65pluginAcl
@@ -45,6 +45,19 @@ _EOF
 my $shared_mb = "\n# SharedMailbox is disabled\n";
 my $public_mb = "\n# PublicMailbox is disabled\n";
 if (($dovecot{'SharedMailbox'} || 'disabled') eq 'enabled'){
+  if (($dovecot{'PrivateIndex'} || 'disabled') eq 'enabled'){
+ $shared_mb =<<'_EOF';
+namespace {
+  type = shared
+  separator = /
+  prefix = shared/%%u/
+  location = maildir:%%h/Maildir:INDEXPVT=~/Maildir/shared/%%u
+  subscriptions = no
+  list = children
+}
+_EOF
+  }
+  if (($dovecot{'PrivateIndex'} || 'disabled') eq 'disabled'){
  $shared_mb =<<'_EOF';
 namespace {
   type = shared
@@ -55,6 +68,7 @@ namespace {
   list = children
 }
 _EOF
+  }
 }
 if (($dovecot{'PublicMailbox'} || 'disabled') eq 'enabled'){
   $public_mb =<<'_EOF';
@@ -87,3 +101,4 @@ _EOF
 push @conf, $common, $shared_mb, $public_mb, $acl;
 $OUT .= '';
 }
+
diff --git a/smeserver-dovecot.spec b/smeserver-dovecot.spec
index 26d19cf..6d89861 100644
--- a/smeserver-dovecot.spec
+++ b/smeserver-dovecot.spec
@@ -1,5 +1,5 @@
 %define version 11.0.0
-%define release 12
+%define release 13
 %define name smeserver-dovecot
 
 
@@ -41,6 +41,9 @@ Configure the dovecot IMAP server with sieve scripts support,
 quota, ACL, extended logging, master user
 
 %changelog
+* Mon Oct 21 2024 John Crisp <jcrisp@safeandsoundit.co.uk> 11.0.0-13.sme
+- use INDEXPVT instead of INDEX for shared mailboxes [SME: 12150]
+
 * Wed Sep 25 2024 Jean-Philippe Pialasse <jpp@koozali.org> 11.0.0-12.sme
 - fix missing sharedmailbox group [SME: 12735]