There is some interesting writing here. You can read most of the items without being a partner. Look particularly at the blogs (Last item in the centre Window) It gives you a good insight to how the changes have evolved.
https://partner.microsoft.com/global/40084742
https://partner.microsoft.com/global/40084742
My Computer
- Computer Manufacturer/Model Number
- Three desktops and one laptop with good specs..
- OS
- Vista and now 7 in 32 and 64 bit.