How to create a custom “Recipient Management” group using Exchange 2010 RBAC

My customer wanted to assign the "Recipient Management" group to their helpdesk staff, who are responsible for the creation and management of their Exchange mailboxes. However, they didn’t want to give the "Delete" permissions to the helpdesk. This is simple to accomplish using Exchange 2010 and RBAC! Currently, when the helpdesk use the EMC with…