diff --git a/plugins/kolab_tags/kolab_tags.js b/plugins/kolab_tags/kolab_tags.js
index bfd61865..0f5fbb3e 100644
--- a/plugins/kolab_tags/kolab_tags.js
+++ b/plugins/kolab_tags/kolab_tags.js
@@ -60,6 +60,17 @@ window.rcmail && rcmail.addEventListener('init', function() {
         rcmail.register_command('tag-remove', function(props, obj, event) { tag_remove(props, obj, event); });
         rcmail.register_command('tag-remove-all', function() { tag_remove('*'); });
 
+        // Disable tag functionality in contextmenu in Roundcube < 1.4
+        if (!rcmail.env.rcversion) {
+            rcmail.addEventListener('menu-open', function(e) {
+                if (e.name == 'rcm_markmessagemenu') {
+                    $.each(['add', 'remove', 'remove-all'], function() {
+                        $('a.cmd_tag-' + this).parent().hide();
+                    });
+                }
+            });
+        }
+
         // ajax response handler
         rcmail.addEventListener('plugin.kolab_tags', update_tags);
 
diff --git a/plugins/libcalendaring/libcalendaring.php b/plugins/libcalendaring/libcalendaring.php
index 8a7de9b2..1053f8e9 100644
--- a/plugins/libcalendaring/libcalendaring.php
+++ b/plugins/libcalendaring/libcalendaring.php
@@ -137,7 +137,7 @@ class libcalendaring extends rcube_plugin
                 'statusorganizer', 'statusaccepted', 'statusdeclined',
                 'statusdelegated', 'statusunknown', 'statusneeds-action',
                 'statustentative', 'statuscompleted', 'statusin-process',
-                'delegatedto', 'delegatedfrom'
+                'delegatedto', 'delegatedfrom', 'showmore'
             );
         }