It may be in both the Exchange Server and individual mailboxes. Ask the
Exchange Admin to check it on the server.

--
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, lbyron wrote:

| I recently discovered that all of our users have the ability to see
| each others Inbox. How do I prevent this? Is there an incorrect
| security setting in Exchange, or must it be changed on each users
| machin? Thanks