Since all your contacts will (finally!) be in one place, the system will help you divide them into separate lists so you can have communicate with different messaging for each group. Segments can be built based on many criteria including history, and they can be as complex as you need them to be. So if you want to send email to everyone who made a donation in the past three years but not this year, who have never been a member, and who live within 20 miles of your house, you can do that! And of course, the segments stay up to date as your contacts change, saving you countless hours of work.