The installer in typical mode does not enable the option. Admin must use the Custom installation mode.
NOTE: The option uses a file to save credential data in a hard disk location that may not be accessible to non-admin users depending on the file system permission settings of a target machine. Admin must ensure that the data location is accessible for write operations by all users of the machine. Because of that prerequisite, the option is unselected by default during the product installation. Normally, the file location is stored in the (hidden) directory,
C:\Documents and Settings\All Users\Application Data\DocuShareClient
It is possible to use a different directory. Use MSI property CREDMANDATADIR to specify a new location in an MSIEXEC command line.
NOTE: Even if the Logon Integration feature is installed, the feature is not actually enabled. To enable the feature, each user (including Admin) must run DocuShare Client Properties and select the Integrate with Windows Logon option (in the General tab).