Decrypt all PGP Desktop encrypted emails in a users mailbox
I have a user who needs PGP Desktop removed from their workstation. The user has been using PGP Desktop Email for some time now and they've accumulated a substantial number of encrypted emails in their mailbox. The user is being migrated to PGP Universal Gateway Email and no longer requires encrypted emails in their mailbox.
Is there a simple way to decrypt all the PGP encrypted emails in the users mailbox or will they need to decrypt each email individually using PGP Viewer?? This seems like a potentially long and painful operation.
The user has PGP Desktop 10.2.1 installed on a Windows XP 2003 machine (they will be upgrading to Windows 7 in the very near future).