Hot daily deal site Groupon picked OpenX Enterprise to serve ads in their "deal of the day" emails. That is the same ad server that we use for our clients. Hundreds of millions of those emails are sent each month with the ad server rotating ads and other items within the emails.
The payoff? Using an ad server saved them time and streamlined the process of updating content, reducing staff needed from three to less than one. Plus community groups raised over $500,000, while raising awareness for Groupon locally.