diff --git a/mail_activity_board/__manifest__.py b/mail_activity_board/__manifest__.py
index a13100d50..df0ca88b6 100644
--- a/mail_activity_board/__manifest__.py
+++ b/mail_activity_board/__manifest__.py
@@ -20,5 +20,6 @@
     ],
     'qweb': [
         'static/src/xml/inherit_chatter.xml',
+        'static/src/xml/systray.xml',
     ]
 }
diff --git a/mail_activity_board/static/src/js/systray.js b/mail_activity_board/static/src/js/systray.js
new file mode 100644
index 000000000..ce8406ab6
--- /dev/null
+++ b/mail_activity_board/static/src/js/systray.js
@@ -0,0 +1,24 @@
+odoo.define('mail_activity_board.systray.ActivityMenu', function (require) {
+    "use strict";
+
+    var ActivityMenu = require('mail.systray.ActivityMenu');
+    var session = require("web.session");
+
+    ActivityMenu.include({
+        events: _.extend({}, ActivityMenu.prototype.events, {
+            'click .o_all_activities_button': '_onClickOpenAllActivities',
+        }),
+
+        _open_boards_activities_domain: function () {
+            return {additional_context: {'search_default_activities_my':  1}};
+        },
+
+        _onClickOpenAllActivities: function () {
+            this.do_action(
+                "mail_activity_board.open_boards_activities",
+                this._open_boards_activities_domain()
+            )
+        },
+    });
+
+});
diff --git a/mail_activity_board/static/src/xml/systray.xml b/mail_activity_board/static/src/xml/systray.xml
new file mode 100644
index 000000000..ab3bf7dd0
--- /dev/null
+++ b/mail_activity_board/static/src/xml/systray.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates>
+
+    <t t-extend="mail.systray.ActivityMenu">
+        <t t-jquery=".o_mail_systray_dropdown_items" t-operation="before">
+            <div class="o_mail_systray_dropdown_top">
+                <button type="button" class="btn btn-link o_all_activities_button">Open All</button>
+            </div>
+        </t>
+    </t>
+
+</templates>
diff --git a/mail_activity_board/views/templates.xml b/mail_activity_board/views/templates.xml
index 54182edb7..38e39e3be 100644
--- a/mail_activity_board/views/templates.xml
+++ b/mail_activity_board/views/templates.xml
@@ -3,6 +3,7 @@
     <template id="assets_backend" name="mail_activity_board assets" inherit_id="web.assets_backend">
         <xpath expr="." position="inside">
             <script type="text/javascript" src="/mail_activity_board/static/src/js/override_chatter.js"/>
+            <script type="text/javascript" src="/mail_activity_board/static/src/js/systray.js"/>
         </xpath>
     </template>
 </odoo>