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.
The use of the Personal Archive (or In-Place Archive) function in Exchange 2010, Exchange 2013 or Exchange 2016 requires an additional Enterprise Client Access License (CAL). Furthermore, compare the differences about the server integration features obtained via Volume Licensing. Exchange Archive in Outlook 2010.