Do you know PAM and SAM? If so, who are they? Hint: DAG or no DAG, you know at least one of them.
ANSWER: Primary Active Manager (PAM) & Standalone Active Manager (SAM). For 2010, in the Mailbox role, you’ll find either 1 or 2 of them. PAM is used to determine which DAG member is primary and running and SAM is used to report issues with local system. So, a mailbox server with DAG will have both PAM and SAM, while a single server environment will just have SAM. Microsoft TechNet Article on PAM and SAM – CLICK HERE