The computing giant revealed plans in November to migrate users of the service over to Skype, and today (January 9) confirmed the date of the switchover.
"On 15th March 2013 we are retiring the existing Messenger service globally (except for mainland China where Messenger will continue to be available) and bringing the great features of Messenger and Skype together," read a statement from Microsoft.
"Update to Skype and sign in using a Microsoft Account (same as your Messenger ID) and all your Messenger contacts will be at your fingertips.
"You'll be able to instant message and video chat with them just like before, and also discover new ways of staying in touch with Skype on your mobile and tablet."
Microsoft completed an acquisition of Skype in 2011 for $8.5 billion (£5.4bn), giving rise to rumours that the communication tool would eventually replace Messenger.
After migrating their accounts over to Skype, Messenger users will be able to take advantage of its instant messaging service, as well as video calling, landline calling, screen sharing, and video calling on smartphones.