Unlike previous versions of Live Messengers, Windows Live Messenger 2011 not only comes with an amazing UI but also with some useful features. With Windows Live Messenger 2011, now you can appear online to selected contacts to whom you want to chat while appearing offline to all others.
Left: Before appearing online to Jacob, Right: After appearing online to Jacob
Left: Menu before appearing online, Right: Menu after appearing online
To do this, just sign in as "Appear offline", right click on the contact(s) to whom you want to appear online and choose "Appear online to this person". To undo this, just right click on the same contact again and chose "Appear offline to this person".
Download Windows Live Messenger 2011