This tip explains how to set mailbox rights in the User and Computers MMC under Active Directory on a Windows 2000...
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Professional administrator's workstation.
If you install the admin pack on your professional workstation, by default you can't view the Exchange advanced tab in the Active Directory Users and Computers snap-in. It took a while before I sorted out this issue, but it's so simple you never thought the solution would lay therein.
First I thought it would have to do with permissions and rights, but even giving myself full administration rights did not resolve this issue. The real solution is choosing within the snap-in to view the advanced settings. It's as simple as selecting your management domain, clicking View in the action menu, then selecting advanced features.