The acquisition talks between Constant Contact chief executive Gail Goodman and Andy Miller, founder of the mobile app start-up CardStar, began to get serious last summer.
First, Goodman had a drink with Miller at the MITX Innovation Awards last June. (She was there to pick up an "Innovation Hall of Fame" award for building the Waltham company into a major force in digital marketing for small businesses, with 900 employees; CardStar took home two awards, too.) Then, she was on a panel with Miller as part of FutureM week in September. What started out as vague discussions about how Constant Contact might partner with CardStar, which makes an app that lets consumers store their frequent-shopper card info on mobile phones,turned into conversations about how Constant Contact might acquire the small Boston start-up.