The present invention is directed to a presence and availability system including: (a) an input (e.g., an interface) operable to receive an agent report from a context sensing agent in a host entity associated with a person, the agent report comprising presence information and the person having an address in an associated name space; (b) a tracking agent 154 operable to tag at least some of the presence information with at least one classification tag; and (c) a policy agent 158 operable to determine presence information to be provided to a requestor based on the at least one classification tag.