function bp_core_install_private_messaging() {
	$sql             = array();
	$charset_collate = $GLOBALS['wpdb']->get_charset_collate();
	$bp_prefix       = bp_core_get_table_prefix();

	$sql[] = "CREATE TABLE {$bp_prefix}bp_messages_messages (
				id bigint(20) NOT NULL AUTO_INCREMENT PRIMARY KEY,
				thread_id bigint(20) NOT NULL,
				sender_id bigint(20) NOT NULL,
				subject varchar(200) NOT NULL,
				message longtext NOT NULL,
				date_sent datetime NOT NULL,
				KEY sender_id (sender_id),
				KEY thread_id (thread_id)
			) {$charset_collate};";

	$sql[] = "CREATE TABLE {$bp_prefix}bp_messages_recipients (
				id bigint(20) NOT NULL AUTO_INCREMENT PRIMARY KEY,
				user_id bigint(20) NOT NULL,
				thread_id bigint(20) NOT NULL,
				unread_count int(10) NOT NULL DEFAULT '0',
				sender_only tinyint(1) NOT NULL DEFAULT '0',
				is_deleted tinyint(1) NOT NULL DEFAULT '0',
				KEY user_id (user_id),
				KEY thread_id (thread_id),
				KEY is_deleted (is_deleted),
				KEY sender_only (sender_only),
				KEY unread_count (unread_count)
			) {$charset_collate};";

	$sql[] = "CREATE TABLE {$bp_prefix}bp_messages_notices (
				id bigint(20) NOT NULL AUTO_INCREMENT PRIMARY KEY,
				subject varchar(200) NOT NULL,
				message longtext NOT NULL,
				date_sent datetime NOT NULL,
				is_active tinyint(1) NOT NULL DEFAULT '0',
				KEY is_active (is_active)
			) {$charset_collate};";

	$sql[] = "CREATE TABLE {$bp_prefix}bp_messages_meta (
				id bigint(20) NOT NULL AUTO_INCREMENT PRIMARY KEY,
				message_id bigint(20) NOT NULL,
				meta_key varchar(255) DEFAULT NULL,
				meta_value longtext DEFAULT NULL,
				KEY message_id (message_id),
				KEY meta_key (meta_key(191))
			) {$charset_collate};";

	dbDelta( $sql );
}