diff --git a/install/sql/incremental/upd_0010.sql b/install/sql/incremental/upd_0010.sql
new file mode 100644
index 0000000000000000000000000000000000000000..e86d62c50ea19e94cc8cd8e7ccc4e34ea63fa665
--- /dev/null
+++ b/install/sql/incremental/upd_0010.sql
@@ -0,0 +1,3 @@
+-- database patch for separate login for mailbox users
+ALTER TABLE `mail_user` ADD `login` VARCHAR( 255 ) NOT NULL ;
+UPDATE `mail_user` SET `login` = `email` WHERE 1 ;
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