Hope you're not too attached to Microsoft's native IM client, because reports are saying that the company is phasing out Windows Live Messenger in favor of Skype. Several unnamed sources have stated that Microsoft is planning to retire their messaging service, instead replacing it with Skype integration.
Over the last several months, Microsoft has already begun merging the two systems, to a point where 80 percent of instant messages sent through Skype now utilize Messenger's systems.
While Microsoft hasn't issued a comment over the news, official word is expected to come soon, perhaps within the next few weeks. Users can already link their Microsoft accounts to Skype, with Skype 6.0 for Mac and Windows, which offers the option to log in using either your Microsoft or Facebook credentials.
Thanks for the tip, Avalith!