Looking through the Wayback Machine, it seems like this was a funky styled-email service that allows sending emails with backgrounds, emojis, etc.:

http://web.archive.org/web/20200225122954/http://www.incredi...

Definitely something whose time seems to have passed, and probably legacy for a couple of years judging by the "Windows 7" support badge on the bottom; I'm not quite sure how this is newsworthy, but then again, it's always interesting to see a relic from another age