Finally Microsoft is going to shut down its 13 years old messenger service from 15th march 2013, Live Messenger went from lots of changes in this 13 years, its UI has been changed and introduced several times.
Last year Microsoft has announced that they will shut down Live Messenger in first quarter of 2013 and now they had announced date too. Actually Microsoft wants to upgrade its users to Skype as they had acquired it last year so they want too keep one IM platform and retire they old one.
Microsoft is also doing hard for its newly acquired service, they had integrated it with MS Office 2013, now they are planning to add some features of text, audio, and video too and very soon it will be integrated with OutLook.Com and XBox too.