Ever wanted the WLM tray icon on the notification area of the taskbar as it did on previous versions of Messenger, well it's possible! :)
Important note: The icon already shows on the notification area of the taskbar on Windows XP and Vista, but it does not show in newer versions of Windows because it was designed to be like that.
Update 11/26/2020: C:\Program Files (x86)\Windows Live\Messenger
(If you're on a x86/32-bit machine then head to C:\Program Files\Windows Live\Messenger)
NOTE: If your drive letter is different than C:, then replace it with whatever drive letter your Windows installation is on.
So now that you're on the Messenger folder,
right-click on msnmsgr.exe
then click on Properties
then click on the Compatibility tab
and then click on the checkbox that says Run this program in compatibility mode for and then click on the box on the bottom of the checkbox and then find and click on Windows Vista (Service Pack 2)
then click the OK