Since Skype belonged to Microsoft, it has been a long waiting for the retiring of the Microsoft Messenger after the announcement by the company to retire the IM to skype.
The proposed date has been confirmed to be March 15, 2013.
Not to worry, all your buddies will be hopped into skype with this procedure. Your buddy list will automatically be migrated to the VoIP-focused offering. Desktop users of the outgoing service (globally except mainland China, where it will live on) should receive a banner notification to install Skype and, as it turns out, clicking on said banner will also uninstall Messenger.