Techniques for electronically engaging customers across all different platforms are disclosed. Based on unique device identifiers captured together with interactions by users with one or more applications provided by a business, a message prepared in a first format is automatically converted to a corresponding message in a second format according to what the devices the user have been interacting with can support. Depending on implementation, the message may be a response by the business to an inquiry from a user or a promotion by the business to be distributed to a group of selected users maintained by the business. The interactions include activities a user has had with one or more of the applications provided by the business and provide the statistical or actual data for the business to determine the group of users to receive the message.