[Anik]

So in this topic the discussion will be about how much Operating Systems do you own? So I will start first . I own these Operating SYstems

1 - Windows XP
2 - Windows 98
3 - Windows 7 Professional
4 - Windows 7 Ultimate
5 - Windows Vista
6 - Windows 10 Professional
7 - Windows 8
8 - Windows 8.1
9 - Ubuntu 14 LTS

Among these Operating Systems I legally own Windows XP, Windows 98, Windows 8.1, Ubuntu 14 LTS 
and Windows 10. And all other are cracked Versions 

[xdude]

Right now I use Windows 7 for Desktop and Windows 8 for Laptop. For my servers I use Ubuntu 14 LTS.

[RickB]

Well, I don't own any OS. Since:
A) I am not the owner, not the rightful owner, I would only own a license.
Since I don't have any retail Windows licenses, I don't own any license, OEM licenses belong to the OEM PC and not to me.
C) I use Ubuntu 14.04 and 16.04 on some of my servers, but does that count for 'owning'?

[kubanek_kuba]

I never bought any system but I have these:
- Windows XP x4
- Windows 7
- Windows 8.1
- Windows 10
- Ubuntu 14.04

[Honey]

I've never really bought any Operating Systems but I have personal license of Win 10 cuz I took part in Technical Preview, Other than that I mostly use Ubuntu 14.04 x64 For my Server Hosting Company and I guess that's about it xD

[jackluter]

Till now I bough windows 7, windows 8.1 and windows 10

[Anik]

Till now I bough windows 7, windows 8.1 and windows 10

You didn't buy Windows 10 . That's free.

[Lampard]

I never bought any OS, but i have used Windows 7, and other old Windows. I also used Windows 8 but never liked it, now i am using Windows 10.

[kubanek_kuba]

I never bought any OS, but i have used Windows 7, and other old Windows. I also used Windows 8 but never liked it, now i am using Windows 10.

Are you using only preinstalled systems? Or you got them using other way?

[meetdilip]

I thought it was the " free " way. Never thought about getting OS pre installed.