A customer has a subscription with Exchange hosting, and they have enough resources in this subscription (such as Exchange mailboxes, public folders, contacts, etc).
However, when the customer goes to the control panel, they cannot create new Exchange objects because the buttons Add New Mailbox, Add New Public Folder, and other ones are missing, despite the fact that the customer is logged in to the control panel as a user with the Account Administrator role (the most powerful role).
At the same time, the customer can see all existing Exchange objects in their CP, including mailboxes, public folders, contacts, and distribution lists. The problem is that the customer cannot create new Exchange objects.
A possible reason for this problem is that the role Account Administrator does not have a corresponding level of privilege, i.e., the Account Administrator may be allowed to view and manage existing Exchange entities, but it may not be allowed to create new ones.
Log in to the Parallels Operations Automation (POA) Provider control panel (or to the control panel of customer's vendor), and go to Top > Configuration Director > Security Manager > Roles. Then switch to the tab Customer roles.
Click on the built-in role Customer Administrator and switch to the tab Privileges.
Check the value of the privilege E-Mail Administration. It should be set to "Admin" to allow the user assigned to this role to create Exchange objects in the control panel.