You will be automatically enrolled in Medicare Parts A and B effective the month you turn 65. If you do not receive Social Security benefits, then you will need to sign up for Medicare by calling the Social Security Administration at 800-772-1213 or online at http://www.socialsecurity.gov/medicareonly/ .
The Client Access Server (CAS) is installed by default. Plan to have a Client Access server in each site that has an Exchange 2010 mailbox server. Your main clients will probably be desktop machines running Microsoft Outlook. Other client types include POP3, IMAP4, Exchange ActiveSync, Web, and Outlook Anywhere.
Microsoft Exchange RBAC is a role-based access control permissions model used in Exchange Server 2010 and Exchange Server 2013. First introduced in Exchange 2010, the Role Based Access Control permissions model is comprised of roles and role groups. A role is defined by a set of tasks an Exchange administrator can perform. A role group is a collection of roles.