what is windows companion?
Windows Live Messenger. (Redirected from Windows Live Messenger Companion) Windows Live Messenger (formerly MSN Messenger) is a discontinued instant messaging client developed by Microsoft for Windows, Xbox 360, BlackBerry OS, iOS, Java ME, S60 on Symbian OS 9.x, and Zune HD. It connected to the Microsoft Messenger service while also having compatibility with Yahoo! Messenger and Facebook Messenger.