If you have more tha one contact invitations to accept you noticed that if you click the invitation yellow box it opens a web browser windows but the link does not work anymore .
you must do the following in order to add all the contacts
--------log off from windows live messenger 2012 -----
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dowload butterfly messenger Butterfly Messenger | Jonathan Kay, MessengerGeek
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extract it (right-click on the mouse and choose ‘extract’')
3)log in with your e-mail and password
4)accept all your invitations (it will ‘pop-up’’ window )
5)log out from butterfly messenger by clicking ‘‘signout from everywhere’’
6)log in on windows live messenger 2012 all your contacts have been added and you can chat.