Userenv logging (User Environment logging)
When you enable userenv logging, you can perform debug logging of the user profile and the system policy processes. Userenv log files also contain information about the status of each Group Policy extension, such as Application Deployment, Security, and Folder Redirection. Userenv log files reveal what is occurring in the background as a user logs on Userenv.log file located in the %SystemRoot%\Debug\UserMode folder Userenv log files contains information about the following: Group Policy settings that are not processed or not applied as expected Folder redirection that does not occur Profile or registry hive load, unload, or deletion failures Logon script, or script not applied as expected Default behaviors occurring because a slow link was detected Roaming profile issues Slow logon issues Whether a given GPO is accessible, and if not, why access was denied. The name of the domain controller that is accessing SYSVOL. The Userenv log has a maximum size of 1 megabyt