For legacy reasons (it's still most used IM in Czechia), I still use ICQ. Few days ago AOL again started to block some users (especially in Russia) and disconnected time to time others using non official clients. They do such things quite regularly, however the problems are usually quite easy to fix once somebody figures out what exactly do they check. So it just forces all clients to adjust some bits in the protocol initiation and it works again. Does it really make sense to complicate things this way? How about finally opening it? Or providing Jabber gateway?