Follow these simple instructions.
- Quit Windows Live Messenger
- Find Windows Live Messenger in the Start menu (All Programs –> Windows Live –> Windows Live Messenger)
- Right click on it and click on Properties
- Go to the Compatibility tab
- Click on “Run this program in compatibility mode for:”
- Select Windows Vista
- Click on Ok and start Windows Live Messenger.
Windows Live Messenger should now minimize to the System Tray in Windows 7.

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Oh! Thank for nice post about How to minimize Windows Live Messenger to System Tray in Windows 7. If you want share more about this topic, you can read it at http://forum.techwoo.com/#2079_how_to_minimize_windows_live_messenger_to_system_tray_in_windows