diff --git a/mail_activity_team/__manifest__.py b/mail_activity_team/__manifest__.py
index 4963644f..d0f43d9d 100644
--- a/mail_activity_team/__manifest__.py
+++ b/mail_activity_team/__manifest__.py
@@ -14,10 +14,15 @@
         'mail_activity_board',
     ],
     'data': [
+        'views/assets_backend.xml',
         'security/ir.model.access.csv',
         'security/mail_activity_team_security.xml',
         'views/mail_activity_team_views.xml',
         'views/mail_activity_views.xml',
         'views/res_users_views.xml',
     ],
+
+    'qweb': [
+        'static/src/xml/systray.xml',
+    ],
 }
diff --git a/mail_activity_team/models/__init__.py b/mail_activity_team/models/__init__.py
index 2f37e6cc..635ee695 100644
--- a/mail_activity_team/models/__init__.py
+++ b/mail_activity_team/models/__init__.py
@@ -1,3 +1,4 @@
 from . import mail_activity_team
 from . import mail_activity
 from . import res_users
+from . import mail_activity_mixin
diff --git a/mail_activity_team/models/mail_activity.py b/mail_activity_team/models/mail_activity.py
index 1fccf746..90490e57 100644
--- a/mail_activity_team/models/mail_activity.py
+++ b/mail_activity_team/models/mail_activity.py
@@ -19,6 +19,8 @@ class MailActivity(models.Model):
                            ('res_model_ids', 'in', model.ids)])
         return self.env['mail.activity.team'].search(domain, limit=1)
 
+    user_id = fields.Many2one(required=False)
+
     team_id = fields.Many2one(
         comodel_name='mail.activity.team',
         default=lambda s: s._get_default_team_id(),
diff --git a/mail_activity_team/models/mail_activity_mixin.py b/mail_activity_team/models/mail_activity_mixin.py
new file mode 100644
index 00000000..0c5035bb
--- /dev/null
+++ b/mail_activity_team/models/mail_activity_mixin.py
@@ -0,0 +1,23 @@
+# Copyright 2018 Eficent Business and IT Consulting Services, S.L.
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from odoo import api, models, fields
+
+
+class MailActivityMixin(models.AbstractModel):
+    _inherit = 'mail.activity.mixin'
+
+    activity_team_user_ids = fields.Many2many(
+        comodel_name='res.users', string='test field',
+        compute="_compute_activity_team_user_ids",
+        search="_search_activity_team_user_ids",
+    )
+
+    @api.depends("activity_ids")
+    def _compute_activity_team_user_ids(self):
+        for rec in self:
+            rec.activity_team_user_ids = rec.activity_ids.mapped(
+                "team_id.member_ids")
+
+    @api.model
+    def _search_activity_team_user_ids(self, operator, operand):
+        return [('activity_ids.team_id.member_ids', operator, operand)]
diff --git a/mail_activity_team/models/res_users.py b/mail_activity_team/models/res_users.py
index e1f9cc33..286d3586 100644
--- a/mail_activity_team/models/res_users.py
+++ b/mail_activity_team/models/res_users.py
@@ -1,6 +1,6 @@
 # Copyright 2018 Eficent Business and IT Consulting Services, S.L.
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-from odoo import models, fields
+from odoo import api, models, fields, modules
 
 
 class ResUsers(models.Model):
@@ -11,3 +11,58 @@ class ResUsers(models.Model):
         relation='mail_activity_team_users_rel',
         string="Activity Teams",
     )
+
+    @api.model
+    def activity_user_count(self, user_id=False):
+        if not self._context.get('team_activities', False):
+            return super().activity_user_count()
+        query = """SELECT m.id, count(*), act.res_model as model,
+                                CASE
+                                    WHEN %(today)s::date -
+                                    act.date_deadline::date = 0 Then 'today'
+                                    WHEN %(today)s::date -
+                                    act.date_deadline::date > 0 Then 'overdue'
+                                    WHEN %(today)s::date -
+                                    act.date_deadline::date < 0 Then 'planned'
+                                END AS states, act.user_id as user_id
+                            FROM mail_activity AS act
+                            JOIN ir_model AS m ON act.res_model_id = m.id
+                            WHERE team_id in (
+                                SELECT mail_activity_team_id
+                                FROM mail_activity_team_users_rel
+                                WHERE res_users_id = %(user_id)s
+                            )
+                            GROUP BY m.id, states, act.res_model, act.user_id;
+                            """
+        user = user_id if user_id else self.env.uid
+        self.env.cr.execute(query, {
+            'today': fields.Date.context_today(self),
+            'user_id': user,
+        })
+        activity_data = self.env.cr.dictfetchall()
+        model_ids = [a['id'] for a in activity_data]
+        model_names = {n[0]: n[1] for n in
+                       self.env['ir.model'].browse(model_ids).name_get()}
+
+        user_activities = {}
+        for activity in activity_data:
+            if not user_activities.get(activity['model']):
+                user_activities[activity['model']] = {
+                    'name': model_names[activity['id']],
+                    'model': activity['model'],
+                    'icon': modules.module.get_module_icon(
+                        self.env[activity['model']]._original_module),
+                    'total_count': 0, 'today_count': 0, 'overdue_count': 0,
+                    'planned_count': 0,
+                }
+            user_activities[activity['model']][
+                '%s_count' % activity['states']] += activity['count']
+            if activity['states'] in ('today', 'overdue'):
+                user_activities[activity['model']]['total_count'] += activity[
+                    'count']
+            if activity['user_id'] == user:
+                user_activities[
+                    activity['model']
+                ]['total_count'] -= activity['count']
+
+        return list(user_activities.values())
diff --git a/mail_activity_team/static/src/js/systray.js b/mail_activity_team/static/src/js/systray.js
new file mode 100644
index 00000000..3a64a7be
--- /dev/null
+++ b/mail_activity_team/static/src/js/systray.js
@@ -0,0 +1,99 @@
+odoo.define('mail_activity_team.systray', function (require) {
+    "use strict";
+
+    var systray = require('mail.systray');
+    var session = require("web.session");
+
+    systray.ActivityMenu.include({
+        events: _.extend({}, systray.ActivityMenu.prototype.events, {
+            'click .o_filter_button': 'on_click_filter_button',
+        }),
+        start: function () {
+            this._super.apply(this, arguments);
+            this.$filter_buttons = this.$('.o_filter_button');
+            this.$my_activities = this.$filter_buttons.first();
+            this.filter = 'my';
+            session.user_context = _.extend({}, session.user_context, {
+                'team_activities': false
+            });
+        },
+
+        _updateCounter: function (data) {
+            this._super.apply(this, arguments);
+            this.$('.o_new_notification_counter').text(this.activityCounter);
+        },
+
+        on_click_filter_button: function (event) {
+            var self = this;
+
+            event.stopPropagation();
+            self.$filter_buttons.removeClass('active');
+            var $target = $(event.currentTarget);
+            $target.addClass('active');
+            self.filter = $target.data('filter');
+
+            session.user_context = _.extend({}, session.user_context, {
+                'team_activities': self.filter === 'team'
+            });
+
+            self._updateActivityPreview();
+
+        },
+        _onActivityFilterClick: function (event) {
+            if (this.filter === 'my') {
+                this._super.apply(this, arguments);
+            }
+            if (this.filter === 'team') {
+                var data = _.extend(
+                    {},
+                    $(event.currentTarget).data(),
+                    $(event.target).data()
+                );
+                var context = {};
+                if (data.filter === 'my') {
+                    context.search_default_activities_overdue = 1;
+                    context.search_default_activities_today = 1;
+                } else {
+                    context['search_default_activities_' + data.filter] = 1;
+                }
+                this.do_action({
+                    type: 'ir.actions.act_window',
+                    name: data.model_name,
+                    res_model:  data.res_model,
+                    views: [[false, 'kanban'], [false, 'form']],
+                    search_view_id: [false],
+                    domain: [
+                        ['activity_team_user_ids', 'in', session.uid]
+                     ],
+                    context:context,
+                });
+            }
+        },
+        _getActivityData: function(){
+            var self = this;
+            return self._super.apply(self, arguments).then(function (data) {
+                session.user_context = _.extend({}, session.user_context, {
+                    'team_activities': !session.user_context['team_activities'],
+                });
+
+                self._rpc({
+                    model: 'res.users',
+                    method: 'activity_user_count',
+                    kwargs: {
+                        context: session.user_context,
+                    },
+                }).then(function (data) {
+                    self.activityCounter += _.reduce(data, function(
+                        total_count, p_data
+                    ){ return total_count + p_data.total_count; }, 0);
+                    self.$('.o_new_notification_counter').text(self.activityCounter);
+                    self.$el.toggleClass('o_no_notification', !self.activityCounter);
+                    session.user_context = _.extend({}, session.user_context, {
+                        'team_activities': !session.user_context['team_activities'],
+                    });
+                });
+            });
+        }
+    });
+
+});
diff --git a/mail_activity_team/static/src/less/systray.less b/mail_activity_team/static/src/less/systray.less
new file mode 100644
index 00000000..9690aef1
--- /dev/null
+++ b/mail_activity_team/static/src/less/systray.less
@@ -0,0 +1,7 @@
+.o_new_notification_counter {
+    .o-position-absolute(@top: 20%, @right: 1px);
+    background: @odoo-brand-optional;
+    color: white;
+    padding: 0em 0.3em;
+    font-size: 0.7em;
+}
diff --git a/mail_activity_team/static/src/xml/systray.xml b/mail_activity_team/static/src/xml/systray.xml
new file mode 100644
index 00000000..5d76f1c6
--- /dev/null
+++ b/mail_activity_team/static/src/xml/systray.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates>
+
+    <t t-extend="mail.chat.ActivityMenu">
+        <t t-jquery=".o_mail_navbar_dropdown_channels" t-operation="before">
+            <li class="o_mail_navbar_dropdown_top">
+                <div>
+                    <button type="button" class="btn btn-sm o_filter_button active" data-filter='my'> My Activities </button>
+                    <button type="button" class="btn btn-sm o_filter_button" data-filter='team'> Team Activities </button>
+                </div>
+            </li>
+        </t>
+        <t t-jquery=".o_notification_counter" t-operation="replace">
+            <span class="o_new_notification_counter badge"/>
+        </t>
+    </t>
+
+</templates>
diff --git a/mail_activity_team/tests/test_mail_activity_team.py b/mail_activity_team/tests/test_mail_activity_team.py
index 413e4122..908a657d 100644
--- a/mail_activity_team/tests/test_mail_activity_team.py
+++ b/mail_activity_team/tests/test_mail_activity_team.py
@@ -116,3 +116,11 @@ class TestMailActivityTeam(TransactionCase):
             self.team2.member_ids = [(3, self.employee.id)]
             self.team2._onchange_member_ids()
             self.assertFalse(self.team2.user_id)
+
+    def test_activity_count(self):
+        res = self.env['res.users'].with_context(
+            {'team_activities': True}
+        ).activity_user_count(
+            user_id=self.employee.id
+        )
+        self.assertEqual(res[0]['total_count'], 0)
diff --git a/mail_activity_team/views/assets_backend.xml b/mail_activity_team/views/assets_backend.xml
new file mode 100644
index 00000000..51f10ca8
--- /dev/null
+++ b/mail_activity_team/views/assets_backend.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <template id="assets_backend" name="mail assets"
+              inherit_id="web.assets_backend">
+        <xpath expr="." position="inside">
+            <script type="text/javascript" src="/mail_activity_team/static/src/js/systray.js"/>
+            <link rel="stylesheet" href="/mail_activity_team/static/src/less/systray.less" type="text/less"/>
+        </xpath>
+    </template>
+</odoo>
diff --git a/mail_activity_team/views/mail_activity_views.xml b/mail_activity_team/views/mail_activity_views.xml
index ec0ecd47..76f54b05 100644
--- a/mail_activity_team/views/mail_activity_views.xml
+++ b/mail_activity_team/views/mail_activity_views.xml
@@ -68,6 +68,5 @@
                 <filter name='team' string="Team" context="{'group_by': 'team_id'}"/>
             </group>
         </field>
-
     </record>
 </odoo>