(My opinion is that it's nearly all bullshit - A ton of what the foundation does is provide incentives for both government and NGO aid-services to stay locked into Microsoft products, but I don't think it's at the level of charity fraud)
Wait, is that documented? The foundation will only give you money if you use Microsoft products? Or they won't officially do that, but potential grant receivers have had foundation representatives strongly hint it would be better for everyone if they kept using Microsoft products?
Because that's a pretty big claim to make otherwise.