Skype is still a free service for Skype-to-Skype video calls and messaging. If you want to use by Skype to call to mobile devices or landlines, you got to pay for it. On the following web page, you can find information regarding the rates and the regions where you can use the service. Even if you can find and install an old version of Live Messenger, you won't be able to use it because the software was discontinued and it's no longer supported on Windows or Mac OS.
