Import PST's into EV 10.4

I am implementing a new EV environment for Exchange 2013. I have a lot of users who have been exporting email to PST's for years. I would like to have import that email into EV. Is there a clean way of doing that? I could have users import email back into their mailbox but then that would take user involvement. I was hoping to be able to scan directories and have EV pull in the PST's automatically.