François Bancilhon has all but accused Microsoft of dirty tactics in an open letter to Steve Ballmer concerning a Mandriva contract with the Nigerian government.

A few days ago Mandriva announced that the Nigerian government has selected Intel-powered classmate PCs running on Mandriva Linux for educational use in nationwide pilot in Nigeria. But then they started to hear a different story from the customer : “we shall pay for the Mandriva Software as agreed, but we shall replace it by Windows afterward.”

François then rhetorically asks Steve “What have you done to these guys to make them change their mind like this?” The comments attached the letter and seem to imply that Microsoft paid the Nigerians to switch from Linux to Windows. François wrote “It’s quite clear to me, and it will be to everyone. How do you call what you just did Steve? There is various names for it, I’m sure you know them.”

You can read more here.