A method and system for using business rules to control invitations to participate in instant message (IM) collaborations. A primary invitee is invited to participate in an IM collaboration via a first IM. A business rule associated with the primary invitee is applied to determine that the primary invitee is unavailable to participate in the IM collaboration. A second IM is sent to automatically invite a backup invitee to participate in the IM collaboration. In another embodiment, a primary invitee with credentials specified by a business rule is to be invited to an IM collaboration at a specified time. An application of the business rule determines that the specified time is outside a valid invitation time period or the primary invitee's credentials are not included in a set of predefined credentials. Following the application of the business rule, a backup invitee is invited.