It is not that they are blocking them but that they will not send out the service books for these programs. From what I know RIM has not even really released the service books for the Windows Live program yet. I remember awhile back that you could get the service book from a zip file on the website or it might have been abother forum. Not really sure. As for the Yahoo good luck on ever getting AT&T to ever send that service book. If you want these types of IM chats then you are going to have to look at other programs. JiveTalk works great and it is the cheapest program that does alot of different services.