这是GOOGLE到的。其中方法就是：
The trick however is very simple: when the popup for the installation files comes up, it is hardcoded somewhere in the setup removal process what file and version it needs to continue the removal process. All you need to do is point it to the original installation files version and it will smoothly run through it.
Something to keep in mind the next time you go out to remove another legacy Exchange machine from your network.