You can use Microsoft Exchange Server permissions to control the amount of access people have to resources such as directory objects and public folders. The permissions you choose to set depend on your organization's security requirements. For example, if you are the only person administering Microsoft Exchange Server, set permissions for only the most critical resources so that no one else can have access to them. If your organization has a large Management Information Services (MIS) department, assign administrators different levels of permissions to control who has access to various resources. You can grant administrators with the most authority access permission for the entire directory, while granting other administrators only the authority to create mailboxes. For additional information about setting permissions, see your Microsoft Exchange Server documentation.