Really, I can't understand why people would use Windows as their OS of choice.
Duh, software & hardware compatability and because it's what they're used to.
And because they don't know anything else exists. Windows was my OS of "choice" before I learned of the existance of GNU/Linux.
Yes, and I've also noticed that the official European computer diploma (ECDL) requires you to learn Windows and MS Office :thumbdwn:
Lots of firms don't use OO because it lacks porgrams like Visio and MS Project also it isn't compatable with MS Office VB scripting so all their old macros won't work, in other words they're locked in.