Backing Up Outlook 2002 Email?

I currently have 25 Win2K Pro workstations attached to a Win2K Server. We currently do not have an email server in-house. I would like to backup the user's Outlook information such as Inbox, Sent Mail and Deleted Items to the user's shared folder on the server. I have run the backup executable for Outlook 2002 which simply makes a copy of the Outlook.pst file. It is my understanding that the Outlook.pst file will hold the Calendar & Contacts information. What about the email? Any suggestions would be appreciated.