Backup up Outlook Data

[Aidoscuz]

I'm going to format a computer soon and I need to backup the all the data from Outlook 2003. I recently formatted another computer and just copied the Outlook.pst, Archive.pst and Extend.dat files from the data files directory, but when I opened up outlook, some things like signatures and the history of typed email addresses were missing. Is there any way of backing up Outlook that keeps absolutely everything?

Thanks