Batch email edit

Hi,

I am looking for a way of editing and saving down emails in batch.
EG, changing the subject of 10 emails to "bla" and then saving down. i
dont have to change the subject, antyhing can be changed as long as
the "save email" dialog appears.

We have a vaulting application whereby we can only unvault after
changing something in the email and then saving down again. I have a
batch of emails that i want to unvault, and it wouldn't be time
efficient to do these individually.

Regards,
Arun