Can we still message our MSN contacts in our email when use Mail Beta?

I want to talk to my MSN contacts when I'm using the Yahoo Mail Beta, but they aren't showing as on. When I go into MSN, they are showing as on. Are we still allowed to do that?

Can we still message our MSN contacts in our email when use Mail Beta?
You can do it. I've done it. Might have been a server problem when you were trying. Keep trying.