Our official corporate language is American English. Now, this is probably what some people would like to think that the language is, in reality our corporate language is some form of unexplored pidgin English with a number of different variants out there. I readily admit that my English grammars and spelling is not perfect, but compared to what can be seen internally in the company I'm waaaay above average.
Even people in the highest of corporate management function can find ways to butcher the English in their official communications (even though there is a supposed safety net of people checking it before releasing it).
Following an exchange involving a French colleague, an Italian collegue and one of my Japanese colleagues can give me a blinding headache trying to dechipher what they actually want to say and it's not American English anyway you look at it... I'm sure I will come back to this subject at some point and especially the interesting e-mail culture that we have...