Facebook desktop messenger is currently unavailable for Windows XP, Click here to install Facebook desktop messenger app for windows 7.
1. Chat and Message your friends on Facebook without being on www.facebook.com
2. See the latest updates from your friends in ticker
3. Get quick notification about what’s going on
4. When you close the sidebar, the program runs in background in taskbar and monitors and notifies you about recent notifications and messages.
Limitations of Facebook Desktop Messenger
1. Cannot chat with multiple friends/ Group Chat
2. No Video Calling Facility
3. Cannot limit chat availability
4. Cannot edit settings
Note: These limitations maybe be fixed in upcoming Versions and Updates