With the latest version of Skype, Users are able to merge Messenger with Skype. Users can instantly send message and video call to their Messenger friends.

Quote from Skype’s Blog
“Our goal remains to deliver the best communications experience for everyone, everywhere. We want to focus our efforts on making things simpler for our users while continuously improving the overall experience. We will retire Messenger in all countries worldwide in the first quarter of 2013 (with the exception of mainland China where Messenger will continue to be available).”

For more information please refer to the site http://blogs.skype.com/en/2012/11/skypewlm.html