What Operating System do you use?

use windows 7 too since it was released and never thought of changing it.

I'm useing Windows 8.1 on my PC, and my Laptop but at work I'm using OSX and Kali Linux! cuz I'm a developer!

Windows 7 64-bit, and it will remain that way until this PC is replaced, I just hope Windows 10 is better by then.

Windows 10 and not enjoying it much, thought I would get used to it but nothing is where it is supposed to be :P

I currently run Windows 10 on my desktop, Windows 7 on my laptop, this will also be upgraded today to Windows 10. I also run a bunch of VM's on my desktop that run various distro's of linux.

I have an only laptop with Windows 10 on main machine (With disabled Microsoft keyloggers...) , Kali linux on dual boot, windows 7 and XP on virtual machine.
Total: 4

Desktop: Win7
Laptop1: Win10
" " 2:Win7/Ubuntu
I also have a crappy old backup laptop that has Mint running on it. I fux with diff Linux Live-Distros from time-to-time.

Hello.
I have an old desktop with Windows XP sp3, but I will convert that to Win7.
I have TWO old laptops with XP on it; the first one can't be updated more than XP sp3. The second one can be updated to VISTA. I will do it one day.
I have a new laptop with WIN 8.1 on it and I will never update that to Win10.

Win 10

Windows 8.1