Having worked for AT&T all my life, now retired, I am primarily a unix user, and find Linux the natural OS for my home computing. Although I spend much time working from a terminal screen, I find Linux quite capable of competing with Microsoft in the windowed environment, except when it comes to playing games. At AT&T we also had Macs and MS computers, and while the Macs were used for work, the Windows computers were primarily used for non-work purposes. Perhaps the German Foreign office has too much free time for play? I find their reasons questionable for returning to MS, but that's their decision. Personally I wouldn't allow a MS OS to be used in a work environment if I was paying the wages.