Apple routinely investigates its vendors for employment conditions and, last year, discovered one of them not handling employee issues properly. Some on this board jumped on Apple's case even though they had made the discovery themselves and corrected the problem. A report just out finds this about Microsoft vendor KYE: Microsoft claims to have been unaware of what are known to everyone as "abysmal conditions".
It would hard to believe that Microsoft is unaware about this. If those 30% is true, that is a medium percentage and impossible for a large company like Microsoft has nothing to do with it.