Greetings, Forgive me for asking what I felt I would be able to find on my own. I'm having some difficulty with finding a grand and combined total figure for the total number of Windows XP OS units issued (sold) worldwide. A combined figure that includes all types. OEM, HOME, and PRO, versions. The best I can find is a vaugue figure of 400 million, but I' for some reason believe it's higher than that. I believed they ceased production in 2008. If anyone might have a clue, I would be most greatful for your answers and input. This is for an essay I'm writing. Sincere regards- Charles