This option is still present in the sp_configure stored procedure, although its functionality is unavailable in SQL Server. The setting has no effect. Direct updates to the system tables are not supported.
This feature will be removed in a future version of Microsoft SQL Server. Do not use this feature in new development work, and modify applications that currently use this feature as soon as possible.
Changing the allow updates option will cause the RECONFIGURE statement to fail. Changes to the allow updates option should be removed from all scripts.