Backing up Outlook in 2003

I am going to be swapping the <.pst .ost .pab .nk2 .dic .msg .srs> files between two machines.

Basically, I am transferring everything over due to a job title switch between two members of our billing dept. They need all of their email archives within the sent, inbox, and various subfolders.

Are there any solid free utilities available for this function or do I need to do this manually? I am not much of an office guru so please advise.

Chris