Index: includes/update.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/update.inc,v
retrieving revision 1.82
diff -u -p -r1.82 update.inc
--- includes/update.inc	22 Nov 2010 07:02:58 -0000	1.82
+++ includes/update.inc	2 Dec 2010 04:03:38 -0000
@@ -696,12 +696,17 @@ function update_fix_d7_requirements() {
       db_add_field('locales_source', 'context', array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => '', 'description' => 'The context this string applies to.'));
     }
 
-    // Rename 'site_offline_message' variable to 'maintenance_mode_message'.
+    // Rename 'site_offline_message' variable to 'maintenance_mode_message'
+    // and 'site_offline' variable to 'maintenance_mode'.
     // Old variable is removed in update for system.module, see
     // system_update_7036().
     if ($message = variable_get('site_offline_message', NULL)) {
       variable_set('maintenance_mode_message', $message);
     }
+    $site_offline = variable_get('site_offline', -1);
+    if ($site_offline != -1) {
+      variable_set('maintenance_mode', $site_offline);
+    }
 
     // Add ssid column and index.
     db_add_field('sessions', 'ssid', array('description' => "Secure session ID. The value is generated by Drupal's session handlers.", 'type' => 'varchar', 'length' => 128, 'not null' => TRUE, 'default' => ''));
Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.528
diff -u -p -r1.528 system.install
--- modules/system/system.install	30 Nov 2010 01:05:24 -0000	1.528
+++ modules/system/system.install	2 Dec 2010 04:03:39 -0000
@@ -2280,9 +2280,10 @@ function system_update_7036() {
   }
   $insert->execute();
 
-  // Remove obsolete variable 'site_offline_message'. See
+  // Remove obsolete variables 'site_offline_message' and 'site_offline'. See
   // update_fix_d7_requirements().
   variable_del('site_offline_message');
+  variable_del('site_offline');
 }
 
 /**