diff --git a/project_issue.install b/project_issue.install
index 36e9e6b..3147f96 100644
--- a/project_issue.install
+++ b/project_issue.install
@@ -747,13 +747,52 @@ function project_issue_update_6009() {
 }
 
 /**
+ * Migrate users with notifications for >= 50 projects to a global setting.
+ *
+ * Since there never used to be a way to say "Send me e-mail notifications
+ * for my own issues for all projects" many users have had to select this
+ * option individually on a large number of projects. If a user is subscribed
+ * to 50 or more projects at this notification level, remove all of those
+ * per-project settings and just set their per-user global default.
+ */
+function project_issue_update_6010() {
+  $ret = array();
+
+  // Find all the users with 50 or more projects configured to send e-mail for
+  // "own issues".
+  $uids = array();
+  $result = db_query("SELECT uid, COUNT(nid) AS project_count FROM {project_issue_notification_project} WHERE level = %d GROUP BY uid HAVING project_count >= 50", PROJECT_ISSUE_NOTIFICATION_OWN);
+  while ($uid = db_result($result)) {
+    $uids[] = $uid;
+  }
+
+  if (!empty($uids)) {
+    // Define a per-user default for all of them.
+    foreach ($uids as $uid) {
+      $query = db_query("INSERT INTO {project_issue_notification_global} (uid, level) VALUES (%d, %d)", $uid, PROJECT_ISSUE_NOTIFICATION_OWN);
+    }
+
+    // Remove all the per-project settings for them.
+    $placeholders = db_placeholders($uids);
+    $query = db_query("DELETE FROM {project_issue_notification_project} WHERE level = " . PROJECT_ISSUE_NOTIFICATION_OWN . " AND uid IN (" . $placeholders . ")", $uids);
+
+    $ret[] = array(
+      'success' => TRUE,
+      'query' => format_plural(count($uids), 'Converted per-project notification settings for @count users to per-user global defaults.', 'Converted per-project notification settings for 1 user a per-user global default.'),
+    );
+  }
+
+  return $ret;
+}
+
+/**
  * Add primary key to {project_issue_notification_project}.
  *
  * WARNING: This update can take a *very* long time (potentially hours) if
  * there are a high number of rows in the table. The test table had 2.34
  * million rows, and the query took over three hours on reasonable hardware.
  */
-function project_issue_update_6010() {
+function project_issue_update_6011() {
   $ret = array();
   db_add_primary_key($ret, 'project_issue_notification_project', array('uid', 'nid'));
   return $ret;
@@ -765,7 +804,7 @@ function project_issue_update_6010() {
  * WARNING: This update can take a *very* long time (potentially hours) if
  * there are a high number of rows in the table.
  */
-function project_issue_update_6011() {
+function project_issue_update_6012() {
   $ret = array();
   db_add_index($ret, 'project_issue_notification_project', 'nid_level', array('nid', 'level'));
   return $ret;
@@ -774,7 +813,7 @@ function project_issue_update_6011() {
 /**
  * Drop unneccessary indexes from {project_issue_notification_project}.
  */
-function project_issue_update_6012() {
+function project_issue_update_6013() {
   $ret = array();
   db_drop_index($ret, 'project_issue_notification_project', 'project_subscriptions_nid_uid_level');
   return $ret;