Old enterprise Vault install

Hi, a few years back we had enterprise vault archiving our old emails, the license ran out and we swapped over to the exchange 2010 built in archiving solution.

i now have emails in user outlooks that are archived using enterprise vault that they cannot open.  i need to know how to get these emails viewable either from out of the enterprise vault or where they are, is this possible?  we do not want to purchase a new enterprise vault license etc.

Any help would be much appreciated.

Regards.

Chris.