Introduced exch10 into exch03 environment (went smoothly). initial exch10 box installed with H & M roles (CAS was to go on another box). Installation finished with no errors. server is happy, clean logs, etc. Ended up needing to install CAS on Exch10. when I try to install CAS role it trys to install the MB role as well, even though it is installed and running fine. in setup, installed roles are normally "greyed out" but the MB Role has a functional check box.