It is possible to enable a user (or users) to export to PST from within the Search application (Search.asp)
To do this create or edit a file called webapp.ini in your C:Program FilesEnterprise Vault folder. The file should be saved with ANSI encoding and should contain :-
This will enable all users to have the restore to PST option. If you want to enable this for specific users use :
After doing the change, do an IISReset, and test it.
This is what restore looks like before the change :
This is what restore looks like after the change :