diff --git a/lib/Alchemy/Phrasea/Setup/Version/MailChecker.php b/lib/Alchemy/Phrasea/Setup/Version/MailChecker.php
new file mode 100644
index 0000000000..10e1b6ca5d
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Setup/Version/MailChecker.php
@@ -0,0 +1,64 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2013 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\Setup\Version;
+
+use Alchemy\Phrasea\Application;
+
+/**
+ * In version 3.9 the user table have been removed.
+ * However for migration process we must be able to detect
+ * duplicate emails.
+ */
+class MailChecker
+{
+    /**
+     * Returns users with duplicated emails
+     *
+     * @param \Application $app
+     * @param string    $table The table name where to look
+     *
+     * @return array An array of User_Adapter
+     */
+    public static function getWrongEmailUsers(Application $app, $table = 'usr')
+    {
+        $sql = 'SELECT usr_mail, usr_id, last_conn, usr_login FROM '. $table .' WHERE usr_mail IS NOT NULL';
+        $stmt = $app['phraseanet.appbox']->get_connection()->prepare($sql);
+        $stmt->execute();
+        $rs = $stmt->fetchAll(\PDO::FETCH_ASSOC);
+        $stmt->closeCursor();
+
+        $users = array();
+
+        foreach ($rs as $row) {
+            if (!isset($users[$row['usr_mail']])) {
+                $users[$row['usr_mail']] = array();
+            }
+
+            $users[$row['usr_mail']][] = $row;
+        }
+
+        $badUsers = array();
+
+        foreach ($users as $email => $usrs) {
+            if (count($usrs) > 1) {
+                $badUsers[$email] = array();
+                foreach ($usrs as $usrInfo) {
+                    $badUsers[$email][$usrInfo['usr_id']] = $usrInfo;
+                }
+            }
+        }
+
+        unset($users);
+
+        return $badUsers;
+    }
+}
diff --git a/lib/classes/Setup/Upgrade.php b/lib/classes/Setup/Upgrade.php
index 266b9f9e4b..e45d85202f 100644
--- a/lib/classes/Setup/Upgrade.php
+++ b/lib/classes/Setup/Upgrade.php
@@ -10,6 +10,7 @@
  */
 
 use Alchemy\Phrasea\Application;
+use Alchemy\Phrasea\Setup\Version\MailChecker;
 
 /**
  * UpgradeManager for Phraseanet.
@@ -64,8 +65,9 @@ class Setup_Upgrade
 
         $this->appbox = $app['phraseanet.appbox'];
 
-        if (count(User_Adapter::get_wrong_email_users($app)) > 0) {
-            throw new Exception_Setup_FixBadEmailAddresses('Please fix the database before starting');
+        if (version_compare($this->appbox->get_version(), '3.9', '<')
+                && count(MailChecker::getWrongEmailUsers($app)) > 0) {
+            throw new \Exception_Setup_FixBadEmailAddresses('Please fix the database before starting');
         }
 
         $this->write_lock();
diff --git a/lib/classes/User/Adapter.php b/lib/classes/User/Adapter.php
index 3024c53ec4..aa852223e8 100644
--- a/lib/classes/User/Adapter.php
+++ b/lib/classes/User/Adapter.php
@@ -1172,45 +1172,6 @@ class User_Adapter implements User_Interface, cache_cacheableInterface
         return $this;
     }
 
-    public static function get_wrong_email_users(Application $app)
-    {
-
-        $sql = 'SELECT usr_mail, usr_id FROM usr WHERE usr_mail IS NOT NULL';
-
-        $stmt = $app['phraseanet.appbox']->get_connection()->prepare($sql);
-        $stmt->execute();
-
-        $rs = $stmt->fetchAll(PDO::FETCH_ASSOC);
-
-        $stmt->closeCursor();
-
-        $users = array();
-
-        foreach ($rs as $row) {
-            if (!isset($users[$row['usr_mail']])) {
-                $users[$row['usr_mail']] = array();
-            }
-
-            $users[$row['usr_mail']][] = $row['usr_id'];
-        }
-
-        $bad_users = array();
-
-        foreach ($users as $email => $usrs) {
-            if (count($usrs) > 1) {
-                $bad_users[$email] = array();
-                foreach ($usrs as $usr_id) {
-                    $user = User_Adapter::getInstance($usr_id, $app);
-                    $bad_users[$email][$user->get_id()] = $user;
-                }
-            }
-        }
-
-        unset($users);
-
-        return $bad_users;
-    }
-
     public function setPrefs($prop, $value)
     {
         $this->load_preferences();
diff --git a/lib/classes/module/console/systemMailCheck.php b/lib/classes/module/console/systemMailCheck.php
index 59598048b8..17940fddd6 100644
--- a/lib/classes/module/console/systemMailCheck.php
+++ b/lib/classes/module/console/systemMailCheck.php
@@ -17,6 +17,7 @@
  * @link        www.phraseanet.com
  */
 use Alchemy\Phrasea\Command\Command;
+use Alchemy\Phrasea\Setup\Version\MailChecker;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
@@ -41,7 +42,10 @@ class module_console_systemMailCheck extends Command
     {
         $output->writeln("Processing...");
 
-        $bad_users = User_Adapter::get_wrong_email_users($this->container);
+        $bad_users = array();
+        if (version_compare($this->getService('phraseanet.appbox')->get_version(), '3.9', '<')) {
+            $bad_users = MailChecker::getWrongEmailUsers($this->container);
+        }
 
         foreach ($bad_users as $email => $users) {
             if ($input->getOption('list')) {
@@ -112,12 +116,14 @@ class module_console_systemMailCheck extends Command
         $output->writeln($email);
 
         foreach ($users as $user) {
+            $dateConn = new \DateTime($user['last_conn']);
+
             $output->writeln(
                 sprintf(
                     "\t %5d %40s   %s"
-                    , $user->get_id()
-                    , $user->get_display_name()
-                    , $user->get_last_connection()->format('Y m d')
+                    , $user['usr_id']
+                    , $user['usr_login']
+                    , $dateConn->format('Y m d')
                 )
             );
         }
diff --git a/lib/classes/module/console/systemUpgrade.php b/lib/classes/module/console/systemUpgrade.php
index 05827825e9..57241460c8 100644
--- a/lib/classes/module/console/systemUpgrade.php
+++ b/lib/classes/module/console/systemUpgrade.php
@@ -67,12 +67,12 @@ class module_console_systemUpgrade extends Command
             try {
                 $output->write('<info>Upgrading...</info>', true);
 
-                if (count(User_Adapter::get_wrong_email_users($this->container)) > 0) {
+                try {
+                    $upgrader = new Setup_Upgrade($this->container, $input->getOption('force'));
+                } catch (\Exception_Setup_FixBadEmailAddresses $e) {
                     return $output->writeln(sprintf('<error>You have to fix your database before upgrade with the system:mailCheck command </error>'));
                 }
 
-                $upgrader = new Setup_Upgrade($this->container, $input->getOption('force'));
-
                 $queries = $this->getService('phraseanet.appbox')->forceUpgrade($upgrader, $this->container);
 
                 if ($input->getOption('dump')) {
diff --git a/tests/Alchemy/Tests/Phrasea/Setup/Version/MailCheckerTest.php b/tests/Alchemy/Tests/Phrasea/Setup/Version/MailCheckerTest.php
new file mode 100644
index 0000000000..edeaa7fb15
--- /dev/null
+++ b/tests/Alchemy/Tests/Phrasea/Setup/Version/MailCheckerTest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Alchemy\Tests\Phrasea\Setup\Version;
+
+use Alchemy\Phrasea\Setup\Version\MailChecker;
+
+class MailCheckerTest extends \PhraseanetPHPUnitAbstract
+{
+    public function testMailChecker()
+    {
+        $conn = self::$DI['app']['phraseanet.appbox']->get_connection();
+        $now = new \DateTime();
+
+        $stmt = $conn->prepare('CREATE TEMPORARY TABLE usr_tmp (usr_id INT, usr_mail VARCHAR(50), usr_login VARCHAR(50), last_conn DATETIME);');
+        $stmt->execute();
+        $stmt->closeCursor();
+        $stmt = $conn->prepare('INSERT INTO usr_tmp (usr_id, usr_mail, usr_login, last_conn) VALUES(1, "email@email.com", "login1", "'.$now->format('Y-m-D H:i:s').'");');
+        $stmt->execute();
+        $stmt->closeCursor();
+        $stmt = $conn->prepare('INSERT INTO usr_tmp (usr_id, usr_mail, usr_login, last_conn) VALUES(2, "email@email.com", "login2", "'.$now->format('Y-m-D H:i:s').'");');
+        $stmt->execute();
+        $stmt->closeCursor();
+        unset($stmt);
+        $users = MailChecker::getWrongEmailUsers(self::$DI['app'], 'usr_tmp');
+
+        $this->assertEquals(1, count($users));
+        $this->assertEquals(2, count($users['email@email.com']));
+    }
+}