Hi Kevin,
I think it's impossible to prevent users from opening PSTs, but there are
adittional controls you can implement. Take a look at this article:
http://www.windowsitpro.com/Articles...0961.html?Ad=1
--
Rui Silva
MVP Windows Server System - Exchange Server
Blog "subject: exchange",
http://msmvps.com/ehlo
"Kevin" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Is there a way to disallow Outlook2003 users from opening Outlook Data
> File (PST)?
>
> I check the GPO, it can only prevent from creating one but I cannot find
> anything for opening.
>