Not that you use Microsoft Messenger, but it you do...

It was rumored that Microsoft planned on retiring its Windows Live Messenger service in favor of Skype, and rather than keep users guessing, the Redmond software maker has now confirmed that's indeed the case. Skype's Tony Bates made the official announcement in a blog post, adding that Messenger users can port their contacts over to Skype by updating to the latest version of the VoIP software.
"Our goal remains to deliver the best communications experience for everyone, everywhere. We want to focus our efforts on making things simpler for our users while continuously improving the overall experience.," Bates explained. "We will retire Messenger in all countries worldwide in the first quarter of 2013 (with the exception of mainland China where Messenger will continue to be available)."
Messenger users interested in switching to Skype need to install Skype 6.0 and sign in using their Microsoft account in order to port their contacts over. No other steps are needed; it all happens automatically. Alternately, Messenger users can opt not to merge their accounts and start fresh.