it is unofficial. It is not signed by microsoft. I could say that I have the official release and just have hacked it to say build 2180 and changed the name. Not challenging your authority or anything like that. Who knows what that could do to people's systems. It may be done in testing, but it was only send to OEMS, so that means that there still could be bugs in it. If Zatrix is worried that it won't work with some programs, I personally believe that it is in his best interest to wait until it is official from Microsoft.