April 8th is the first day that you may be required to upgrade to Skype. Starting today April 8th, 2013 Microsoft will be informing Messenger users to start the upgrade process to Skype which will include the automated migration of all your IM and contact list plus a free welcome gift 🙂
Follow the upgrade process here – http://www.skype.com/en/download-skype/skype-for-computer/windows-live-messenger/