I agree.
That was totally uncalled for and I always believed that any questions are warranted here unless the person is totally clueless to begin with.
I would not use anything from Microsoft for making decision about building my server because their testing environment does not always reflect real time usage.
Those information would help, however, you should never based entirely upon it.
You should be comparing your own performance data with your own setup under your own environment.
Dual core would be fine in the short run.
However, in the long run, you will eventually have to convert to quad core once you start to adopt newer software along with perhaps vista compatibility which will:
a. Cost you more money; even though the quad processor is probably cheaper at this point, it is still additional cost above of what you purchase for the dual plus the motherboard might not be compatible either (which means more $$$ for the motherboard)
b. Cost you time; changing the processor will require downtime. With all your finger crossed, the server might be back in no time but never say never, right?
c. Cost you grief if a and b do not work out like you think on paper.
You also have to remember that even though the quad is running 2Ghz, it is really running a fast and efficient 2Ghz granted that half of the cores are not being used most of the time but it is there when you need it.
Pair them up with a decent amount of memories and you are set.
Good luck with your build.