So, you're ready to upgrade your Microsoft Exchange Server organization from Exchange Server 2003 to Exchange Server 2007? Great. Before you get started, however, make sure that you have a solid planning strategy in place, which includes a clear understanding of the changes made to the administration and permissions model. With Exchange 2007, you now have flexibility in how you assign permissions to administrators. Several changes have also been made to improve the manual permissions configuration you must do to split Exchange permissions from other administrative permissions.