There is one option: to be available, busy, invisible and I can sign out. But it doesn't work pretty well, because I signed out, and am online at WLM, but some of my friends doesn't see me on their contact list either in WLM. Before the big WLM and Yahoo cooperation, everything was just perfect, so that's why I am upset.
I don't think to make a Windows Live e-mail address is the only and the best solution, but I think yes, I should think about it.