How do I change a Vault Shortcut back to an E-Mail?

Hi,

We archive our users mailboxes so that they have 3 months worth of live mail in their mailboxes. For those users who are unable to manage their e-mail and cannot keep their mailboxes under our Exchange limit we allow them to have only 2 months of live mail in their mailbox. Our compliance team have stated that all users must have 3 months of live mail and no less and I have been tasked with ensuring that the users who have 2 months of live mail end up with 3 months. Is there a way to replace shortcuts with mail to make the users on the 2 month archive complient with our new archive rules?

Thank you in advance,

Joe