Have you ever had to spend 30 minutes explaining to someone how to recover a mailbox of a user that was accidentally deleted?  Was it honestly more like 1 hour?  Do you work in an environment where you are the "Exchange guy" and every other person will ask you how to do it instead of reading the Exchange 2003 Disaster Recovery Operations Guide?  Or are you in the position where you are trying to teach junior admins, the backup admin or another person how to perform a restore and you just don't have a lab or the time to build one?  Well Microsoft has heard your plea and has developed a virtual lab to teach administrators how to restore a deleted user, mailbox and how to restore a mail store.  Here is the link.