> I don't know for sure if there is an official stipulation in the grant that the PC's run exclusively MS products but I would think so.
The Bill and Melinda Gates Foundation is an official not-for-profit entity and cannot make any such stipulations on their donations. If they do, let your state's Attorney General know. The grant allows you to purchase PCs, so you can't abuse it and buy a new car with it. You have to buy whatever PCs with whatever OS you want.
Now there is that agressively worded MS OEM agreement that says the OS has to stay with the PC it came with, but that does *not* mean you can't install another OS, just that you can't use your MS license on another PC.