I have the same problem, MSN is ok on my N900 but QQ always says wrong usename and password.
I am new to the N900 and all the jargon but i did install the "extra protocol plugins for contacts and conversations"
I am English living in Beijing, so i also really want to use QQ on my N900, My Iphone works very well with QQ but it is a seperate programe, I love the way the N900 can combine all, MSN QQ and SMS.
I use QQ 2009 international on my computer, no problem, (Except there seems NOW, (After QQ 2004 eng) That i cannot see anyones pictures, And yes, Any email you ever send to Tencent gets ignored.
I would be very interested in the answer to this problem,
thanks for this buddy but i do have an other issue ( I CANT SIGN IN TO QQ through voip ) it gives me an error of user name or password ? why is that ? i searched and searched but couldnt know why is that happening with stock qq messenger ?i need help to sign in into qq through voip or pidgin..help needed !!