Mailbox Passwords


I am busy decomissioning my ehcp servers so I need to move a few users mailboxes over to a new host without having to find out all their passords. I am using EHCP version and I see that in phpmyadmin the mailbox passwords are encrypted, is there a way to covert them to plain text so that I can create the mailbox at the new host and then change MX record without interupting the user?

Any feeback would be graetly appreciated.

Thanks so much.