How to disable PST? Push following Dword registry value via GPO. HKEY_LOCAL_MACHINE\Software\Microsoft\Office\12.0\Outlook\DisablePST Set the Value to "1" to disable and "0" to allow. This will have to be pushed to each workstation. With that DWORD value there, the options for both creating and opening Outlook Data Files, and the "Archive" option in the File menu is removed. Office versions Office 9 is stand for Office 2000 Office 10 is stand for Office 2002 Office 11 is stand for Office 2003 Office 12 is stand for Office 2007 Office 14 is stand for Office 2010