Microsoft has offered a free backup utility for its popular Outlook program, since version 2000. This easy to use backup program incorporates itself into the Outlook program and will back up your .pst files that you specify. It can also be set to make backups at intervals specified by the user.
This current version available for download specifies it works with with versions 2002 and 2003. Though I believe it will work with version 2000 of Outlook as well.
Give it a try. It is available for download here.
[tags]outlook, backup, .pst, files, free, download, [/tags]