Shoutbox

Hi,
I have posted a smiliar question, which was on the bottom of some previous post with no answers, so I posted a new one.

I want to develop software for msn microsoft, and when googling, I find all sorts of answers. I didnt understand yet if it is offcialy supported by microsoft or not.
Here is an sdk for messenger, but its from 2006. Some people told me its not supported any more.
http://www.microsoft.com/downloads/details.aspx?F...934&DisplayLang=en

Then I came here, and it says its not longer supported:
http://msdn.microsoft.com/en-us/library/bb229407.aspx

I thought maybe here I can get an answer, but I got lost:
http://dev.live.com/
There is the messenger sdk, but as I understood, its only to implement messenger on web site.
Then there is the Microsoft Live ID. Maybe its the answer for me, but I dont know, didnt understand yet.
More related to the sdk subject is on:
http://msdn.microsoft.com/en-us/library/bb264574.aspx

I want to have a nice development environment, something official (pay money if need to), where I can write programs that can use Messenger functions such as send and receive message. Be able to read message content, know who the sender is, etc'. Basiclly its the API, but I didnt find any official source that is up to date.
You can set under reference in visual basic the "Messenger type library", but then you need to rely you have the correct version, you dont really know what you have etc'.
Is there anything organized outhere, just like the great MSG PLUS, only for messenger?

At first I thought of learning the protocol (which is well published over the net), and then use a different port (I want to use this software that I write while messenger is working, so cant use same port, I think), but it might be impossible (correct me if I wrong).
I am SURE its possible, beacuse of many third party programs available out there, like MSG PLUS for instance.
Any help guys?
Thanks.