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Outlook: Preventing the Use of .pst Files

Can I prevent people from using .pst files?

Beginning with Microsoft Office XP Service Pack 2 (SP2), Outlook supports a DisablePst entry of type REG_DWORD in the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\10.0\Outlook registry subkey. Set the value of DisablePst to 1 to prevent users from creating or opening Personal Folders (.pst) files. For more information about this change, see the Microsoft article "OL2002: The Options to Prevent an Exchange, POP3, IMAP, and Other Server Types Accounts Are Not Available" (http://support.microsoft.com/?kbid=317819).

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