AtMail, one of the four webmail plugins we offer, will be discontinuing their open source product and switching to a commercial (paid) licensed product only. cPanel has announced they will be removing AtMail from cPanel as of August 2012. We've decided to disable it on our servers as of July 1, 2012.
If you're a regular Webmail user, please check out the other three webmail plugins available: Horde, SquirrelMail, and RoundCube. With Webmail you aren't tied to any one application...all three take you to the same email. Each has different features as well as a different look and feel (and different levels of theme customization), but they all take you to the same email.
I'll admit I'm going to miss AtMail. It had a nice, clean interface...though in my opinion it's in no way worth what they're charging for it. Roundcube is a close second as far as look and feel. Though cPanel has no immediate plans to replace AtMail, we may start looking around at other Webmail application options.
If there's one you've always wanted, please feel free to let us know! We always encourage user feedback, and try to implement as many user suggestions as possible.