Kik is any type of those cross platform propietary instant messaging applications which is an attempt at allowing the Blackberry Messenger experience towards wider audience. In element to offering your conventional instant messaging features, Kik will disclose when the person you're emailing is typing a principles, when they've recieved a voice-mail, and when they've read an email. Kik also nicely sustains pop-up push notifications or a live tile so that you always get the note. For the cross stand experience, Kik is also designed for iPhone and Android, though not any longer Blackberry.
Windows Phone Central is doing a nice video demo on the new Kik messenger actually in operation.