This question is a variation on the Mailbox Rights question.
Upgraded from Exchange 5.5 to Echange 2003, all users have read access to each others mailbox.
Active Directory Users and Computers, User Properties, Exchange Advanced, Mailbox Permissions shows
Authentificated Users have Full Mail Rights,
Everyone has Read and
Anonymous Logon has Read.
There are about 300 users of exchange therefore any solution has to be a 'global one'
All these permissions are inherited from the Organisation Level in Exchange System Manager.
The goal is users can only read their own mailbox unless given specific read permission through Delegation in Outlook
I tried setting deny permission for Everyone on one mailbox but that locked the user out as well!
What permissions are required for Exchange to work and users to be able to read their own mail only?