Development was discontinued in 2013 and the programme is no longer supported. Microsoft recommends that you use 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. To do this, you and your friend or acquaintance only need to have this program installed and a good connection to the global network.
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.
If you don't want to install additional software such as ICQ and Skype, Windows Messenger is the best choice.