diff --git wp-admin/includes/class-wp-ms-users-list-table.php wp-admin/includes/class-wp-ms-users-list-table.php
index 36d55e1..f255553 100644
--- wp-admin/includes/class-wp-ms-users-list-table.php
+++ wp-admin/includes/class-wp-ms-users-list-table.php
@@ -188,7 +188,7 @@ class WP_MS_Users_List_Table extends WP_List_Table {
 								$actions = array();
 								$actions['edit'] = '<a href="' . $edit_link . '">' . __( 'Edit' ) . '</a>';
 
-								if ( current_user_can( 'delete_user', $user->ID) && ! in_array( $user->user_login, $super_admins ) ) {
+								if ( current_user_can( 'delete_user', $user->ID) && $user->user_email != get_site_option( 'admin_email' ) && $user->ID != get_current_user_id() && count( $super_admins ) > 1 ) {
 									$actions['delete'] = '<a href="' . $delete = esc_url( network_admin_url( add_query_arg( '_wp_http_referer', urlencode( stripslashes( $_SERVER['REQUEST_URI'] ) ), wp_nonce_url( 'edit.php', 'deleteuser' ) . '&amp;action=deleteuser&amp;id=' . $user->ID ) ) ) . '" class="delete">' . __( 'Delete' ) . '</a>';
 								}
 
diff --git wp-admin/includes/ms.php wp-admin/includes/ms.php
index 8458526..a5a04ba 100644
--- wp-admin/includes/ms.php
+++ wp-admin/includes/ms.php
@@ -140,6 +140,10 @@ function wpmu_delete_user( $id ) {
 
 	$id = (int) $id;
 
+	if ( is_super_admin( $id ) )
+		if ( ! revoke_super_admin( $id ) )
+			return false;
+
 	do_action( 'wpmu_delete_user', $id );
 
 	$blogs = get_blogs_of_user( $id );
@@ -165,7 +169,7 @@ function wpmu_delete_user( $id ) {
 			restore_current_blog();
 		}
 	}
-
+	
 	$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->users WHERE ID = %d", $id ) );
 	$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->usermeta WHERE user_id = %d", $id ) );
 
diff --git wp-admin/network/edit.php wp-admin/network/edit.php
index 2d3f952..7b412fd 100644
--- wp-admin/network/edit.php
+++ wp-admin/network/edit.php
@@ -22,16 +22,17 @@ function confirm_delete_users( $users ) {
 	$current_user = wp_get_current_user();
 	if ( !is_array( $users ) )
 		return false;
-
 	screen_icon();
 	?>
 	<h2><?php esc_html_e( 'Users' ); ?></h2>
+	<?php ob_start(); ?>
 	<p><?php _e( 'Transfer or delete posts and links before deleting users.' ); ?></p>
 	<form action="edit.php?action=dodelete" method="post">
 	<input type="hidden" name="dodelete" />
 	<?php
 	wp_nonce_field( 'ms-users-delete' );
 	$site_admins = get_super_admins();
+	$site_admin_count = count( $site_admins );
 	$admin_out = "<option value='$current_user->ID'>$current_user->user_login</option>";
 
 	foreach ( ( $allusers = (array) $_POST['allusers'] ) as $key => $val ) {
@@ -41,8 +42,14 @@ function confirm_delete_users( $users ) {
 			if ( ! current_user_can( 'delete_user', $delete_user->ID ) )
 				wp_die( sprintf( __( 'Warning! User %s cannot be deleted.' ), $delete_user->user_login ) );
 
-			if ( in_array( $delete_user->user_login, $site_admins ) )
-				wp_die( sprintf( __( 'Warning! User cannot be deleted. The user %s is a network admnistrator.' ), $delete_user->user_login ) );
+			if ( in_array( $delete_user->user_login, $site_admins ) ) {
+				$site_admin_count --;
+
+				if ( $site_admin_count < 1 ) {
+					ob_end_clean(); // don't even output the form
+					wp_die( __( 'You cannot delete all super admins.' ) );
+				}
+			}
 
 			echo "<input type='hidden' name='user[]' value='{$val}'/>\n";
 			$blogs = get_blogs_of_user( $val, true );
@@ -85,6 +92,7 @@ function confirm_delete_users( $users ) {
 	?>
 	</form>
     <?php
+	echo ob_get_clean();
 	return true;
 }
 
@@ -356,7 +364,9 @@ switch ( $_GET['action'] ) {
 
 		check_admin_referer( 'deleteuser' );
 
-		if ( $id != '0' && $id != '1' ) {
+		$user = get_userdata( $id );
+
+		if ( ! is_super_admin( $id ) || ( $user->user_email != get_site_option( 'admin_email' ) && get_current_user_id() != $id && count( get_super_admins() ) > 1 ) ) {
 			$_POST['allusers'] = array( $id ); // confirm_delete_users() can only handle with arrays
 			$title = __( 'Users' );
 			$parent_file = 'users.php';