All of the exams associated with Microsoft Certification start with a prefix of two numbers (7something) and then a three-digit identifier (check out this example). Here is an explanation of the "seventy-something" prefixes, if this has ever caused you some consternation:
If you want to know why they all start with "7" to start with, sit still for a minute, for once, and I'll ask someone who knows things like this. OK, I'm back. I talked to Jim Clark, who knows most things about everything. I thought maybe we picked "70" because of the building 7 mystery on the MIcrosoft campus. Or because 70 was how old the program manager's dog was, on the day of our first exam release. Or because 7 is the fourth Mersenne prime exponent (don't believe me?). But really, it is just because: back in the nascent stages of this program we released exams with 10-, 20-...60- prefixes for early days certification products. And by the time we locked on the current program, we happened to be at "70-", where it has stayed since. Is it just me, or is my story about building 7 better?
*Or should I say, 70-101.