Many of us use more than one operating system in the course of our day, and you can even dual boot Windows 7 with XP or Vista, but for the purpose of the poll, we only want to hear what you'd consider your main OS. If you don't use Windows at all, you can skip this little poll altogether. So, without further ado:
What Windows Operating System Are You Using Most?(online polls)
You may very well be using another incarnation of Windows not listed in the poll, but the majority of you will be using XP, Vista, or Windows 7, so that's the focus of the poll. If you've got more to say on the matter than the post allows, let's hear it in the comments.