For a while Microsoft has always had it's instant messenger services. A few wave updates ago you can even chat using Messenger from your inbox. However there has been news around for quite a while about Microsoft moving it's messenger service over to Skype. However now it will become to mandatory to upgrade to Skype to keep using the messenger system.
So far I have counted two emails sent out to users (at least for me) detailing about the change. According to the email after March 15, 2013, you will no longer be able to sign into Messenger, except for China where Messenger will continue to be used there.
The email says that you must upgrade to Skype, and the process of doing so is quite easy. All you have to do is download Skype and sign in using your Microsoft Account. Once you sign in your existing Messenger Contacts will be added automatically, and you can video call and text chat with them as normal.
The update is mostly seen for the better, as now once you connect your Microsoft Account to Skype you can effectively use Messenger on any device that has Skype installed. Skype even runs on Linux, so if you are like me and use a popular distro such as Ubuntu, you can now message your contacts, as the original Windows Live Messenger client was Windows only, with the exception of chatting from your inbox (which was limited).