No you cannot use WLM anymore. I have resisted the horrible Windows Live Messenger 2011 version for 2 years. And when they brought out WLM 2012 I never installed that either.
I had been using WLM 2009 version on my Windows 7, Windows Vista and Windows 8. Now Microsoft have blocked WLM completely, so I can't even use it on Windows XP anymore. Instead I get an error message, telling me to upgrade to Skype, which I don't want to do. So I have now uninstalled WLM.
Worse still, Hotmail is gone, and replaced by Outlook Mail which I hate. It's ugly and not user friendly at all.