diff --git a/plugins/kolab_addressbook/kolab_addressbook.js b/plugins/kolab_addressbook/kolab_addressbook.js
index fb280b1d..314bc1e0 100644
--- a/plugins/kolab_addressbook/kolab_addressbook.js
+++ b/plugins/kolab_addressbook/kolab_addressbook.js
@@ -364,18 +364,49 @@ rcube_webmail.prototype.contact_history_dialog = function()
         return false;
     }
 
+    if (this.contact_list && this.contact_list.data[rec.cid]) {
+        $.extend(rec, this.contact_list.data[rec.cid]);
+    }
+
     // render dialog
     $dialog = libkolab_audittrail.object_history_dialog({
-        module: 'kolab_addressbooks',
+        module: 'kolab_addressbook',
         container: '#contacthistory',
-        title: rcmail.gettext('objectchangelog','kolab_addressbook'),
+        title: rcmail.gettext('objectchangelog','kolab_addressbook') + ' - ' + rec.name,
 
         // callback function for list actions
         listfunc: function(action, rev) {
             var rec = $dialog.data('rec');
-            console.log(action, rev, rec)
-            //rcmail.loading_lock = rcmail.set_busy(true, 'loading', this.loading_lock);
-            //rcmail.http_post('action', { _do: action, _data: { uid: rec.uid, list:rec.list, rev: rev } }, saving_lock);
+
+            if (action == 'show') {
+                // open contact view in a dialog (iframe)
+                var dialog, iframe = $('<iframe>')
+                    .attr('id', 'contactshowrevframe')
+                    .attr('width', '100%')
+                    .attr('height', '98%')
+                    .attr('frameborder', '0')
+                    .attr('src', rcmail.url('show', { _cid: rec.cid, _source: rec.source, _rev: rev, _framed: 1 })),
+                    contentframe = $('#' + rcmail.env.contentframe)
+
+                // open jquery UI dialog
+                dialog = rcmail.show_popup_dialog(iframe, '', {}, {
+                    modal: false,
+                    resizable: true,
+                    closeOnEscape: true,
+                    title: rec.name + ' @ ' + rev,
+                    close: function() {
+                        dialog.dialog('destroy').attr('aria-hidden', 'true').remove();
+                    },
+                    minWidth: 400,
+                    width: contentframe.width() || 600,
+                    height: contentframe.height() || 400
+                });
+                dialog.css('padding', '0');
+            }
+            else {
+                rcmail.kab_loading_lock = rcmail.set_busy(true, 'loading', rcmail.kab_loading_lock);
+                rcmail.http_post('plugin.contact-' + action, { cid: rec.cid, source: rec.source, rev: rev }, rcmail.kab_loading_lock);
+            }
         },
 
         // callback function for comparing two object revisions
@@ -407,13 +438,10 @@ rcube_webmail.prototype.contact_render_changelog = function(data)
     }
 
     source = this.env.address_sources[rec.source] || {}
-    // source.editable = !source.readonly
+    source.editable = !source.readonly
 
     data.module = 'kolab_addressbook';
     libkolab_audittrail.render_changelog(data, rec, source);
-
-    // set dialog size according to content
-    // dialog_resize($dialog.get(0), $dialog.height(), 600);
 };
 
 // callback for rendering a diff view of two contact revisions
@@ -519,8 +547,24 @@ rcube_webmail.prototype.contact_show_diff = function(data)
         width: 480
     }).show();
 
-    // set dialog size according to content
-    // dialog_resize($dialog.get(0), $dialog.height(), rcmail.gui_containers.notedetailview.width() - 40);
+    // set dialog size according to content frame
+    libkolab_audittrail.dialog_resize($dialog.get(0), $dialog.height(), ($('#' + rcmail.env.contentframe).width() || 440) - 40);
+};
+
+
+// close the contact history dialog
+rcube_webmail.prototype.close_contact_history_dialog = function(refresh)
+{
+    $('#contacthistory, #contactdiff').each(function(i, elem) {
+        var $dialog = $(elem);
+        if ($dialog.is(':ui-dialog'))
+            $dialog.dialog('close');
+    });
+
+    // reload the contact content frame
+    if (refresh && this.get_single_cid() == refresh) {
+        this.load_contact(refresh, 'show', true);
+    }
 };
 
 
@@ -541,6 +585,21 @@ function kolab_addressbook_contextmenu()
                     }
                 });
             }
+            else if (menu.menu_name == 'contactlist' && rcmail.env.kolab_audit_trail) {
+                // add "Show History" item to context menu
+                menu.menu_source.push({
+                    label: rcmail.get_label('kolab_addressbook.showhistory'),
+                    command: 'contact_history_dialog',
+                    classes: 'history'
+                });
+                // enable history item if the contact source supports it
+                menu.addEventListener('activate', function(p) {
+                    if (p.command == 'contact_history_dialog') {
+                        var source = rcmail.env.address_sources ? rcmail.env.address_sources[rcmail.env.source] : {};
+                        return !!source.audittrail;
+                    }
+                });
+            }
         });
     }
 
diff --git a/plugins/kolab_addressbook/kolab_addressbook.php b/plugins/kolab_addressbook/kolab_addressbook.php
index 35908bbf..93215e40 100644
--- a/plugins/kolab_addressbook/kolab_addressbook.php
+++ b/plugins/kolab_addressbook/kolab_addressbook.php
@@ -63,6 +63,7 @@ class kolab_addressbook extends rcube_plugin
         if ($this->rc->task == 'addressbook') {
             $this->add_texts('localization');
             $this->add_hook('contact_form', array($this, 'contact_form'));
+            $this->add_hook('contact_photo', array($this, 'contact_photo'));
             $this->add_hook('template_object_directorylist', array($this, 'directorylist_html'));
 
             // Plugin actions
@@ -73,7 +74,7 @@ class kolab_addressbook extends rcube_plugin
 
             $this->register_action('plugin.contact-changelog', array($this, 'contact_changelog'));
             $this->register_action('plugin.contact-diff', array($this, 'contact_diff'));
-            $this->register_action('plugin.contact-show', array($this, 'contact_show'));
+            $this->register_action('plugin.contact-restore', array($this, 'contact_restore'));
 
             // get configuration for the Bonnie API
             if ($bonnie_config = $this->rc->config->get('kolab_bonnie_api', false)) {
@@ -509,13 +510,26 @@ class kolab_addressbook extends rcube_plugin
             */
         }
 
-        if ($this->bonnie_api && $this->rc->action == 'show') {
+        if ($this->bonnie_api && $this->rc->action == 'show' && empty($p['record']['rev'])) {
             $this->rc->output->set_env('kolab_audit_trail', true);
         }
 
         return $p;
     }
 
+    /**
+     * Plugin hook for the contact photo image
+     */
+    public function contact_photo($p)
+    {
+        // add photo data from old revision inline as data url
+        if (!empty($p['record']['rev']) && !empty($p['data'])) {
+            $p['url'] = 'data:image/gif;base64,' . base64_encode($p['data']);
+        }
+
+        return $p;
+    }
+
     /**
      * Handler for contact audit trail changelog requests
      */
@@ -677,21 +691,80 @@ class kolab_addressbook extends rcube_plugin
     }
 
     /**
-     * Handler for audit trail revision view requests
+     * Handler for audit trail revision restore requests
      */
-    public function contact_show()
+    public function contact_restore()
     {
-        
+        if (empty($this->bonnie_api)) {
+            return false;
+        }
+
+        $success = false;
+        $contact = rcube_utils::get_input_value('cid', rcube_utils::INPUT_POST, true);
+        $source = rcube_utils::get_input_value('source', rcube_utils::INPUT_POST);
+        $rev = rcube_utils::get_input_value('rev', rcube_utils::INPUT_POST);
+
+        list($uid, $mailbox, $msguid) = $this->_resolve_contact_identity($contact, $source, $folder);
+
+        if ($folder && ($raw_msg = $this->bonnie_api->rawdata('contact', $uid, $rev, $mailbox))) {
+            $imap = $this->rc->get_storage();
+
+            // insert $raw_msg as new message
+            if ($imap->save_message($folder->name, $raw_msg, null, false)) {
+                $success = true;
+
+                // delete old revision from imap and cache
+                $imap->delete_message($msguid, $folder->name);
+                $folder->cache->set($msguid, false);
+                $this->cache = array();
+            }
+        }
+
+        if ($success) {
+            $this->rc->output->command('display_message', $this->gettext(array('name' => 'objectrestoresuccess', 'vars' => array('rev' => $rev))), 'confirmation');
+            $this->rc->output->command('close_contact_history_dialog', $contact);
+        }
+        else {
+            $this->rc->output->command('display_message', $this->gettext('objectrestoreerror'), 'error');
+        }
+
         $this->rc->output->send();
     }
 
+    /**
+     * Get a previous revision of the given contact record from the Bonnie API
+     */
+    public function get_revision($cid, $source, $rev)
+    {
+        if (empty($this->bonnie_api)) {
+            return false;
+        }
+
+        list($uid, $mailbox, $msguid) = $this->_resolve_contact_identity($cid, $source);
+
+        // call Bonnie API
+        $result = $this->bonnie_api->get('contact', $uid, $rev, $mailbox, $msguid);
+        if (is_array($result) && $result['uid'] == $uid && !empty($result['xml'])) {
+            $format = kolab_format::factory('contact');
+            $format->load($result['xml']);
+            $rec = $format->to_array();
+
+            if ($format->is_valid()) {
+                $rec['rev'] = $result['rev'];
+                return $rec;
+            }
+        }
+
+        return false;
+    }
+
 
     /**
      * Helper method to resolved the given contact identifier into uid and mailbox
      *
      * @return array (uid,mailbox,msguid) tuple
      */
-    private function _resolve_contact_identity($id, $abook)
+    private function _resolve_contact_identity($id, $abook, &$folder = null)
     {
         $mailbox = $msguid = null;
 
diff --git a/plugins/kolab_addressbook/lib/kolab_addressbook_ui.php b/plugins/kolab_addressbook/lib/kolab_addressbook_ui.php
index e20cf14d..55fa6dd6 100644
--- a/plugins/kolab_addressbook/lib/kolab_addressbook_ui.php
+++ b/plugins/kolab_addressbook/lib/kolab_addressbook_ui.php
@@ -108,6 +108,7 @@ class kolab_addressbook_ui
 
 
             if ($this->plugin->bonnie_api) {
+                $this->rc->output->set_env('kolab_audit_trail', true);
                 $this->plugin->api->include_script('libkolab/js/audittrail.js');
 
                 $this->rc->output->add_label(
@@ -121,6 +122,7 @@ class kolab_addressbook_ui
                     'kolab_addressbook.actiondelete',
                     'kolab_addressbook.objectdiffnotavailable',
                     'kolab_addressbook.objectchangelognotavailable',
+                    'kolab_addressbook.revisionrestoreconfirm',
                     'close'
                 );
 
diff --git a/plugins/kolab_addressbook/lib/rcube_kolab_contacts.php b/plugins/kolab_addressbook/lib/rcube_kolab_contacts.php
index 9f117e42..c6dfd112 100644
--- a/plugins/kolab_addressbook/lib/rcube_kolab_contacts.php
+++ b/plugins/kolab_addressbook/lib/rcube_kolab_contacts.php
@@ -554,11 +554,22 @@ class rcube_kolab_contacts extends rcube_addressbook
     {
         $rec = null;
         $uid = $this->id2uid($id);
+        $rev = rcube_utils::get_input_value('_rev', rcube_utils::INPUT_GPC);
+
         if (strpos($uid, 'mailto:') === 0) {
             $this->_fetch_groups(true);
             $rec = $this->contacts[$id];
             $this->readonly = true;  // set source to read-only
         }
+        else if (!empty($rev)) {
+            $rcmail = rcube::get_instance();
+            $plugin = $rcmail->plugins->get_plugin('kolab_addressbook');
+            if ($plugin && ($object = $plugin->get_revision($id, kolab_storage::id_encode($this->imap_folder), $rev))) {
+                $rec = $this->_to_rcube_contact($object);
+                $rec['rev'] = $rev;
+            }
+            $this->readonly = true;  // set source to read-only
+        }
         else if ($object = $this->storagefolder->get_object($uid)) {
             $rec = $this->_to_rcube_contact($object);
         }
diff --git a/plugins/kolab_addressbook/localization/en_US.inc b/plugins/kolab_addressbook/localization/en_US.inc
index a65f46c9..2547de2a 100644
--- a/plugins/kolab_addressbook/localization/en_US.inc
+++ b/plugins/kolab_addressbook/localization/en_US.inc
@@ -61,9 +61,12 @@ $labels['actionmove'] = 'Moved';
 $labels['actiondelete'] = 'Deleted';
 $labels['showrevision'] = 'Show this version';
 $labels['restore'] = 'Restore this version';
+$labels['revisionrestoreconfirm'] = 'Do you really want to restore revision $rev of this contact? This will replace the current contact with the old version.';
 $labels['objectnotfound'] = 'Failed to load contact data';
 $labels['objectchangelognotavailable'] = 'Change history is not available for this contact';
 $labels['objectdiffnotavailable'] = 'No comparison possible for the selected revisions';
+$labels['objectrestoresuccess'] = 'Revision $rev successfully restored';
+$labels['objectrestoreerror'] = 'Failed to restore the old revision';
 
 $messages['bookdeleteconfirm']  = 'Do you really want to delete the selected address book and all contacts in it?';
 $messages['bookdeleting'] = 'Deleting address book...';
diff --git a/plugins/kolab_addressbook/skins/larry/folder_icons.png b/plugins/kolab_addressbook/skins/larry/folder_icons.png
index 19b8cfab..f5325cfc 100644
Binary files a/plugins/kolab_addressbook/skins/larry/folder_icons.png and b/plugins/kolab_addressbook/skins/larry/folder_icons.png differ
diff --git a/plugins/kolab_addressbook/skins/larry/kolab_addressbook.css b/plugins/kolab_addressbook/skins/larry/kolab_addressbook.css
index 2d2d8795..11ca84e4 100644
--- a/plugins/kolab_addressbook/skins/larry/kolab_addressbook.css
+++ b/plugins/kolab_addressbook/skins/larry/kolab_addressbook.css
@@ -244,3 +244,7 @@
 	content: ")";
 }
 
+div.contextmenu.rcmmainmenu ul.iconized li a.history > span.icon {
+	background: url(folder_icons.png) 1px -214px no-repeat;
+}
+