The following registry hack does not remove the My Briefcase icon from a user who has previously logged on:

Use Regedt32 to modify the default user hive on the server and NT Workstation at:

\Software\Microsoft\Windows NT\CurrentVersion\Winlogon

On the Edit menu, Add Value name RunSyncApp as a type REG_DWORD and set the data value to 0.

On the NT Workstation, navigate to:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon

On the Edit menu, Add Value name RunSyncApp as a type REG_DWORD and set the data value to 0.

Rename %SystemRoot%\System32\syncapp.exe to syncapp.old.

Shutdown and restart the NT Workstation.