For what use?
I mean what do they try to accomplish with that?
Traditional nubmercrunching doesn't care about GUIs, all users there are perfectly able to use a shell to complile their fortran programms and run them.
CGI? Well sure, paint your pictures with MSPaint. It's not like multiple processors would help you with that.
The main problems with Windows is just that there are virtually no applications availiable for it. And those few applications usually cost quite a lot of money and rarely are of acceptable quality. Just imagine having to download software from a wiered unsecure source onto your 80kEuro box. Imagine getting a virus or worm onto your expensive device during a multi-week computing run?
Microsoft sees that it cannot grow on the PC market anymore and is therefore trying to get into any market it can get. And they want to get away from the "we are total idiots" image.
Just look at Sony. They gained quite some reputation for having professional products.
