Index: wp-includes/user.php
===================================================================
--- wp-includes/user.php	(revision 33652)
+++ wp-includes/user.php	(working copy)
@@ -2056,6 +2056,7 @@
 		}
 		$wpdb->update( $wpdb->users, $data, compact( 'ID' ) );
 		$user_id = (int) $ID;
+		$wpdb->update( $wpdb->comments, array( 'comment_author_email' => $user_email, 'comment_author_url' => $user_url ), array( 'user_id' => $user_id ) );
 	} else {
 		$wpdb->insert( $wpdb->users, $data + compact( 'user_login' ) );
 		$user_id = (int) $wpdb->insert_id;