Exchange 2010 : move role cas / hub to the mailbox server

Hello,

I have a new customer with three Exchange servers, Mailboxes, CAS and Hub (exchange 2010 SP2)

I need to change the configuration to have only one exchange server with the three roles.

I'm trying to find some "how to" or reading material before starting the process. I've found the documentation to move a role to a new server, new hardware. Is it a correct way to proceed ?

I would like to move the hub role and the cas role on the mailbox server.

Thanks in advance for you help, have a nice day

Yannick