It might be helpful if you have a good story rehearsed to tell the CSR. Since the offer is for "Microsoft employees, family, and friends" you might be a friend of Ernie Tramposh, the guy who designed the tumbling hourglass (which should be designated the MS corporate logo IMO).

Since I develop applications for the Windows Mobile platform, I just told the truth. I'm not an employee, but I guess ISDs are eligible, too. I added a line to my Family Plan for $10 monthly on a 1-year contract.