Abandoned shopping carts are an unfortunate reality for ecommerce sites. However, with the help of Web Forms lightboxes, they're a potential source of quick wins.  Here's a strategy that works well to recover a percentage of abandoned carts:

Use an exit-intent lightbox with a strong offer for visitors who are about to exit your checkout page. This works well for checkout processes where the customer enters all their information on one page. Once the visitor opts-in, offer a coupon code on the Thank-You Page, and send a series of follow-up emails reminding them to use their coupon. Here’s a step-by-step tutorial on how to set that up.