Just few tidbits, not a comprehensive answer at all, and based on Outlook 2003 and not 2002:
Few outpost files are in
C:\Documents and Settings\<userName>\Application Data\Microsoft\Outlook
Files I see are outcmd.dat, Outlook.NK2, ourlook.srs, outlook.xml, outlPRT. No idea what they are.
.pst file and archive.pst are in
C:\Documents and Settings\<userName>\Local Settings\Application Data\Microsoft\Outlook
also here are extend.dat, mailbox.PAB, outlook.log
Outlook.pst contains contacts and mails in one bundle.
I once made changes, and had to reimport contacts and it wasn't easy. I actually had to make another layer in Contacts, so I have some empty Outlook thing and under it is my contacts list. Unfortuanately don't recall the details