Abstract: A computer-implemented method of automated contact list determination can include detecting a collaborative event in real time and, responsive to detecting the collaborative event, identifying an owner of an electronic message and at least one contact specified by the electronic message, wherein the electronic message is associated with the collaborative event. The contact can be added to a collaborative contact list for the owner. The method can include determining a collaborative ranking for each contact in the collaborative contact list according to a collaborative history between the owner and that contact, selecting a plurality of contacts from the collaborative contact list according to collaborative ranking, and including each of the plurality of contacts within a dynamic address book of the owner.