Sign in to or out of Messenger for Mac
To use Messenger for Mac, you must have a Windows Live IDAn e-mail address from any of the Windows Live services. These include all e‑mail accounts ending in "@live.com," "@hotmail.com," "@msn.com," and other accounts that are registered with Windows Live.. To sign up for a free Windows Live ID account, visit the Windows Live ID Web site.
Do any of the following:
Sign in to Messenger for Mac
Sign out of an account