This doesn't really tell us anything, only that he liked an executive he was working with, and is no longer working with him. There's a bigger backstory here that we're not hearing about.
The OLPC is not switching from Linux to XP. Microsoft (and many other corporations and universities) were provided with prototype machines, and Microsoft decided to try porting Windows to it. OLPC did not discourage this, but all of OLPC's software to date runs solely on Linux.
