Osama, there are several keys and configs that will allow you to handle PST files that are being archived. You can set them to read-only, delete them, etc. But I don't know of any settings to completely prevent creation of new PST's.

Anyone else know of anything?

You can set it through group policy or use the link below. I used the link below.

http://support.microsoft.com/?kbid=258277

You can turnoff Outlook AutoArchiving using a setting in the PST Migration Policy within EV.

Outlook 98 and later support a DisablePST registry value. This DWORD value is under the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\11.0\Outlook registry subkey in Outlook 2003; change "11.0" to "10.0" for Outlook 2002, "9.0" for Outlook 2000, or "8.0" for Outlook 98. The DisablePST value isn't present by default, so you need to add it if you want to disable .pst file use. Allowable values are 1 (disabled) and 0 (enabled, the default).

DisablePST's initial use in early builds of Outlook 2002, Outlook 2000, and Outlook 98 was to prevent users from archiving and exporting to or importing from a .pst file. Setting DisablePST to 1 in those versions turns off those features and disables the creation of new .pst files from the File, New menu. User accounts that you configure in Corporate/Workgroup mode, however, can still add a new or existing .pst file to their email profile (through the File, Data File Management dialog box in Outlook 2002 or the Tools, Services dialog box in Outlook 2000 or Outlook 98), so some ad hoc .pst file use is still possible in these versions.

Beginning with Outlook 2002 (with Office XP Service Pack 2--SP2--applied) and continuing with Outlook 2003, DisablePST blocks all user-controlled methods of creating a new .pst file. Setting DisablePST to 1 prevents all new .pst files except those that Outlook itself creates for use with IMAP or Hotmail accounts or WSS lists.

> is there a function in EV Client to prevent users
> from creating new PST files.

No. It can be done, but you'll have to go to Win reg keys or native OS methods of stopping it.