diff --git a/addons/auth_signup/models/res_users.py b/addons/auth_signup/models/res_users.py
index 598d390dbd5..27fd43a0403 100644
--- a/addons/auth_signup/models/res_users.py
+++ b/addons/auth_signup/models/res_users.py
@@ -81,6 +81,8 @@ class ResUsers(models.Model):
                 values.pop('login', None)
                 values.pop('name', None)
                 partner_user.write(values)
+                if not partner_user.login_date:
+                    partner_user._notify_inviter()
                 return (self.env.cr.dbname, partner_user.login, values.get('password'))
             else:
                 # user does not exist: sign up invited user
@@ -92,7 +94,8 @@ class ResUsers(models.Model):
                 if partner.company_id:
                     values['company_id'] = partner.company_id.id
                     values['company_ids'] = [(6, 0, [partner.company_id.id])]
-                self._signup_create_user(values)
+                partner_user = self._signup_create_user(values)
+                partner_user._notify_inviter()
         else:
             # no token, sign up an external user
             values['email'] = values.get('email') or values.get('login')
@@ -110,6 +113,20 @@ class ResUsers(models.Model):
                 raise SignupError(_('Signup is not allowed for uninvited users'))
         return self._create_user_from_template(values)
 
+    @api.multi
+    def _notify_inviter(self):
+        for user in self:
+            invite_partner = user.create_uid.partner_id
+            if invite_partner:
+                # notify invite user that new user is connected
+                title = _("%s connected") % user.name
+                message = _("This is his first connection. Wish him welcome")
+                self.env['bus.bus'].sendone(
+                    (self._cr.dbname, 'res.partner', invite_partner.id),
+                    {'type': 'user_connection', 'title': title,
+                     'message': message, 'partner_id': user.partner_id.id}
+                )
+
     def _create_user_from_template(self, values):
         template_user_id = literal_eval(self.env['ir.config_parameter'].sudo().get_param('base.template_portal_user_id', 'False'))
         template_user = self.browse(template_user_id)
diff --git a/addons/bus/static/src/js/services/bus_service.js b/addons/bus/static/src/js/services/bus_service.js
index 8e367b7f93a..af505dfc6e4 100644
--- a/addons/bus/static/src/js/services/bus_service.js
+++ b/addons/bus/static/src/js/services/bus_service.js
@@ -27,11 +27,12 @@ var BusService =  CrossTab.extend(ServicesMixin, {
      *
      * @param {string} title
      * @param {string} content
+     * @param {function} [callback] if given callback will be called when user clicks on notification
      */
-    sendNotification: function (title, content) {
+    sendNotification: function (title, content, callback) {
         if (window.Notification && Notification.permission === "granted") {
             if (this.isMasterTab()) {
-                this._sendNativeNotification(title, content);
+                this._sendNativeNotification(title, content, callback);
             }
         } else {
             this.do_notify(title, content);
@@ -76,8 +77,9 @@ var BusService =  CrossTab.extend(ServicesMixin, {
      * @private
      * @param {string} title
      * @param {string} content
+     * @param {function} [callback] if given callback will be called when user clicks on notification
      */
-    _sendNativeNotification: function (title, content) {
+    _sendNativeNotification: function (title, content, callback) {
         var notification = new Notification(title, {body: content, icon: "/mail/static/src/img/odoo_o.png"});
         notification.onclick = function () {
             window.focus();
@@ -86,6 +88,9 @@ var BusService =  CrossTab.extend(ServicesMixin, {
             } else if (this.close) {
                 this.close();
             }
+            if (callback) {
+                callback();
+            }
         };
     },
 
diff --git a/addons/mail/static/src/js/services/mail_notification_manager.js b/addons/mail/static/src/js/services/mail_notification_manager.js
index b3e5239f9ee..475cbd44f90 100644
--- a/addons/mail/static/src/js/services/mail_notification_manager.js
+++ b/addons/mail/static/src/js/services/mail_notification_manager.js
@@ -165,13 +165,13 @@ MailManager.include({
      * Add or remove failure when receiving a failure update message
      *
      * @private
-     * @param {Object} data
-     * @param {Object[]} data.elements list of mail failure data
-     * @param {string} data.elements[].message_id ID of related message that
+     * @param {Object} datas
+     * @param {Object[]} datas.elements list of mail failure data
+     * @param {string} datas.elements[].message_id ID of related message that
      *   has a mail failure.
-     * @param {Array} data.elements[].notifications list of notifications
+     * @param {Array} datas.elements[].notifications list of notifications
      *   that is related to a mail failure.
-     * @param {string} data.elements[].notifications[0] sending state of a mail
+     * @param {string} datas.elements[].notifications[0] sending state of a mail
      *   failure (e.g. 'exception').
      */
     _handlePartnerMailFailureNotification: function (datas) {
@@ -313,6 +313,8 @@ MailManager.include({
             this._handlePartnerActivityUpdateNotification(data);
         } else if (data.type === 'mail_failure') {
             this._handlePartnerMailFailureNotification(data);
+        } else if (data.type === 'user_connection') {
+            this._handlePartnerUserConnectionNotification(data);
         } else {
             this._handlePartnerChannelNotification(data);
         }
@@ -402,8 +404,25 @@ MailManager.include({
             this._mailBus.trigger('unsubscribe_from_channel', data.id);
             this.do_notify(_("Unsubscribed"), message);
         }
+    },
+     /**
+     * Shows a popup to notify a user connection
+     *
+     * @private
+     * @param {Object} data
+     * @param {Object[]} data.partner_id id of the connected partner
+     * @param {string} data.title title to display on notification
+     * @param {Array} data.messages message to display on notification
+     */
+    _handlePartnerUserConnectionNotification: function (data) {
+        var self=this;
+        var partner_id = data.partner_id;
+        this.call('bus_service', 'sendNotification', data.title, data.message, function(){
+            self.call('mail_service', 'openDmWindow', partner_id);
+        });
     },
     /**
+     * 
      * On receiving an update on user status (e.g. becoming 'online', 'offline',
      * 'idle', etc.).
      *