The instant messaging (IM) client in Windows XP. Windows Messenger was the XP counterpart to MSN Messenger, both of which were replaced by Windows Live Messenger and later Skype. See Windows Live Messenger and Microsoft Lync.
"Windows Messenger." YourDictionary, n.d. Web. 17 August 2018. <http://www.yourdictionary.com/windows-messenger>.
Windows Messenger. (n.d.). Retrieved August 17th, 2018, from http://www.yourdictionary.com/windows-messenger