Mailbird was featured on Product Hunt in December, 2015. The product was unexpectedly hunted and they had to respond quickly, rather then implement their planned campaign. They wrote a case study of their experience at What Being Featured on Product Hunt Feature Taught Us.
They got over 100 upvotes on that day and the website got over 1000 new visitors. They also got an extra 20(ish) new users a day via Product Hunt.
An award-winning desktop email management client for Windows 7, 8 and 10.