Abstract: A method, system, and computer program product for implementing availability messaging services is provided. The method includes associating a user with an audience type with respect to an entity. The entity provides at least one product or service. The method also includes defining and applying at least one domain to each audience type operable for differentiating among audience types. In response to receiving a request for availability information regarding the product or service, the method includes determining a corresponding schedule date for the product or service. The method further includes converting the schedule date to a lead time to ship date and/or lead time to arrival date, and generating an availability message based upon the audience type of the user. The availability message includes the lead time to ship date and/or the lead time to arrival date.