The Outlook.pst file can only be used by one instance of Outlook at a time.
See this page for some suggestions:
Take a look here, it may help: http://www.slipstick.com/outlook/share.htm
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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, Kurt asked:
| Can one Outlook 2000 mailbox be shared on my Win XP laptop and my Win
| ME PC? I need to access my mail from each machine.