Administrative events with Group Policy as their event source are logged in the System log (as on previous platforms).
Detailed events (which used to be found in the userenv.log) are now found in the Group Policy Operational Log, and these detailed events are now logged by default and don’t need to be enabled the way userenv logging had to be.
***
Mitch Tulloch was lead author for the Windows Vista Resource Kit from Microsoft Press, which is THE book for IT pros who want to deploy, maintain and support Windows Vista in mid- and large-sized network environments. For more information see www.mtit.com.