I had the same issue, but with OL2000. I wanted my wife & I to share the
same inbox where each of us would not miss an e-mail that another received
from our ISP.
I set up an outlook.pst file in under "all users" in the same format as what
the installation performed originally. (Opened a new Personal Folders file
in OL, then changed the name with Explorer after I found all the other
outlook.pst files that were installed for my family of four.)
I then had to go through each user account to set up the new "Personal
Folders" properties to make it the POP3 account for new mail. After applying
a pop-up said the new settings would not take affect until I re-opened OL.
Once I opened OL, it warned me that settings had been changed and asked if I
wanted to make new shortcuts, etc. After anwering yes, I was able to then
copy Contacts, Sent Files, etc. to the new Personal Folders. After
everything looked okay, I was able to Close Personal Folders that were the
original OL folders.
We now share a common inbox.