Abstract: Embodiments of the present invention enable policy-based management of a user contacts list. Applications of the present invention are its use in embodiments of Instant Messaging (IM) systems. During an IM session, a session owner may temporarily add a contact to an active contacts list for a duration determined by evaluating constraints from one or more policies associated with the contact. At IM session initialization, a session owner's persistently stored contacts and their associated policies are retrieved, and the policies are evaluated. An active contacts list for use during the IM session is generated from a subset of stored contacts for which all associated policy constraints are satisfied. In embodiments, the active contacts list may be updated during a session by re-evaluating the stored contacts and associated policies. In embodiments, an active contacts list is updated after addition of a new contact determined to have an associated enabled policy satisfied.