I don't understand any of this, can you please explain it in simple language?
I understand that now anyone can use the code to do whatever, but exactly WHAT is the "whatever"?
This article is only of interest to professional Windows System Administrators who use Microsoft's "Exchange" software to manage email servers. Everyone else, and I suspect you fall in this category, can pretty much ignore it since it doesn't apply to regular Windows use.
The article describes a vulnerability in the Exchange software that can lead to bad things in the server.