Restricting users from creation of new PST but allowing users from adding old pst

Hi,

As far as I can tell, we can use the DisablePST registry value to prevent users from creating and accessing the .pst files.

Basically the method can only meet half of your request that users can't create new .pst files, but allowing them to add old .pst files doesn't seem possible.

Regards,

Melon Chen
TechNet Community Su