W10 here!

Windows 8.1

Tablet/Notebook Hybrid. It has the full-fledged Windows though, not that RT stuff.

Kali is indeed awesome, I used backtrack a few years ago quite frequently. It is a recommended distro like grml for every network- and sysadmin

On your everyday machine? Awesome! I heard you can upgrade the preview to a "normal" release of Windows 10? Any problems so far? I heard that there are some bugs because of the video drivers meaning only the ones which Windows 10 ships with can be used (read: you can use other drivers [vendor drivers] but you have to fiddle with the inis).

Yes, and it works really well overall. I haven´t had any crashes and I have used it since it was first made available (I did the same with W8 way back :)). I think it is a good way to give input and help MS perfect the system. I haven´t had any bugs that I can think of but I rarely play videos on this computer so that might be an explanation.

Kali is a linux distribution now?

Need to log that in my memory banks as i remember paying $20 for access to Kali gaming server back in the 90s lol.

A couple of computers make a couple of Windows versions:

On my 486DX: Win 3.11 and Win 95 SE in dualboot
On my Pentium 166MMX and my Pentium 233MMX: Win 98 SE
On my Athlon64 3000+: Win XP SP3
On my Athlon II 635: Win 7 Ultimate

And my next computer will probably be Windows 10 ;)

Still using Windows 7 on my laptop, while my brother bought one with 8.1. Might change both to Windows 10.

7 since 2010, just made a new pc, 7, bought a laptop few month ago took 7 aswell.

I don't want to support 8 and its metro ui.