The Skype application will be integrated by default with Windows 8.1. This marked the end of the Messages application in the Modern UI environment.
With Windows 8, Microsoft offers the Mail, Calendar, Contacts and Messages to use in the Modern UI environment. Many of them will receive an update with Windows 8.1 . But for the instant messaging application messages, it has almost to an end.
After Windows Live Messenger, it is time for the Messages application to be replaced on the desktop by a new messaging application, known to many, as Skype. According to information from The Verge, a true integration of Skype will be available with Windows 8.1 and messages will have no longer have any place.
This approach is actually quite natural with the withdrawal of the Messenger service and avoiding unnecessary duplication with respect to instant messaging. By cons, in the present state, Skype for Windows 8 is far from being at its counterpart on the desktop for all the opportunities available. Hopefully Skype for Windows 8.1 will be more convincing.
The Verge says that Skype for Windows 8.1 will close ties with other applications. It will be possible in any case to answer voice and video calls directly from the lock screen.