Is there any difference between all those exams? Do all 3 of them exist? I'm a bit confused because on the Microsoft site all they speak about is 70-680 (see
TS: Windows 7, Configuring)

:
Since I'm a college student, I can get a special discount and free second chance when I use this site:
Student Certification Discounts In Belgium I can get a 52% discount

In the list of the student discount site under MCTS, all certifications start with 72 and the Configuring Windows 7 certification is labeled as 72-680.
In here, the sticky is about 71-680

Since I didn't find the solution to my question with google (maybe I just didn't look hard enough), I'd try my luck here.
First time certification btw

Thanks in advance!