We stopped developing the program in 2013, and no longer support it. Microsoft recommends that you utilize Skype for voice and video calls in the future.
Windows Messenger is a great application that allows you to communicate in real time with other people who are hundreds of thousands of miles away. This can only be done by installing this software and having a good connection to the Internet.
It should also be noted that Windows Messenger supports Session Initiation Protocol (SIP), which is used by the Microsoft Office Live Communications Server service, as well as the ability to connect to Microsoft .NET Messenger.
As a replacement for ICQ and Skype, Windows Messenger is your top choice if you do not want to install additional programs.