Topic summary
Windows Live Messenger
Extracted from the Wikipedia article MSN Messenger.
Messenger Companion
Windows Live Messenger Companion was an add-in for Windows Internet Explorer that detected when a user is on a website that one of their friends has shared content from and surfaces that update so that the user can instantly view what their friends have shared and leave a comment to the shared content on Windows Live. The service utilizes Windows Live ID and integrates tightly with Windows Live Messenger to obtain the user's contact list and their shared contents. The features of Windows Live Messenger Companion include: