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1. Mac OS X (On my Retina MacBook Pro at Home/School)
2. Ubuntu 13.10 (My ThinkPad at Home)
3. Android (Smartphone and Tab)
4. Windows 8 (at work)
5. Windows 7 (VM at work on my Win8 Machine)
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1 - Windows XP Prof - pc remote desktop to for work that lives in Sweden.
2 - Windows 7 32 bit - pc I remote desktop to which is my Jenkins server.
3 - Windows XP Prof - pc in my office (my old pc)
4 - Windows XP Prof - pc in my office which has a tool on which licence is connected to the CPU so cannot get rid of the pc.
5 - Windows 7 Prof 64 bit - pc in my office I work on.
6 - Windows 7 Home Premium 64 bit - my home pc.
7 - Windows 7 Home Premium 64 bit - my laptop.
8 - IOS 7 - My phone.
9 - Solaris - pc at work I work on for a specific project.
10 - Virtual disk operating system running on my work pc to support applications that work only on 32bit windows operating systems.
"Program testing can be used to show the presence of bugs, but never to show their absence."
<< please vote!! >>
modified 11-Nov-13 2:13am.
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That's not 10 different Operating Systems, but more like 4-5 "Different (major) versions of an OS should be treated as a different OS". Among other systems, I have a Windows 7 32 bit and a Windows 7 64 bit, but I counted that as a single Windows 7. Your list should look more like this:
1 - Windows XP
2 - Windows 7
3 - Apple
4 - Solaris
I am not sure I would consider the VM as number 5. I think it depends on what it is actually running.
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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I count 32-bit and 64-bit separately, particularly when different architectures are involved.
And Apple is a company, not an operating system.
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I know what you are saying, the reason I have both a Windows 7 32 and 64 bit, is because they are different. It just didn't seem to me that the description of this survey made that distinction.
I also have a Win2K Server and a Win2K desktop. I counted that as 1 OS. I did count WinXP Pro and WinXP Embedded as 2. So much goes into building the XPe image and a couple of years after deployment you figure out you can't run the latest version of a 3rd party supplier's library because the XPe image is missing a required component.  But I digress.
Sure, Apple is a company. I really don't know what he has on his phone, so I didn't change what he wrote.
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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I agree, the survey creator could have been more clear... Then again it might have been his intention... To spark debate.
"Program testing can be used to show the presence of bugs, but never to show their absence."
<< please vote!! >>
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Aren't 1, 3 and 4 on your list the same OS ... just because you access the PC in a different location does not make it another operating system 
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Well that is a different debate all together... Does the creator of the survey produce enough information to determine what is meant by different OS?
"Program testing can be used to show the presence of bugs, but never to show their absence."
<< please vote!! >>
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Home and work laptops - Windows 8
Phone and tabs - Windows phone 8 and Windows 8 RT
I found several posts below telling about different OSthey have. I feel bit lacking as i ultimately use only ONE OS  (in its different forms)
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Well, you backed a winner.
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5 people claim more that 20 OSs on computers they use, not computers in the organisation but machines they get their grubby little mits on - rubbish.
Never underestimate the power of human stupidity
RAH
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As far as I can tell, a lot of people seem to be counting each different version of an O/S as a separate O/S. Seems wrong to me.
I can kind of see counting Android separately from desktop Linux (similarly Windows Phone 8 and desktop Windows), in reality, they're running the same kernel (mostly).
IMHO its sad how few O/S there are now - its really just Windows, Linux and a few BSD-like O/S (including MacOS) for the most part.
O/S research and innovation seems to be non-existant now. The only significant counter-example I've seen was Microsoft Research's Singularity[^]. Please enlighten me if there are more.
"If you don't fail at least 90 percent of the time, you're not aiming high enough."
Alan Kay.
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Rob Grainger wrote: each different version of an O/S as a separate O/S
The survey states "Different (major) versions of an OS should be treated as a different OS".
So I count OpenVMS (AXP) 8.x separate from OpenVMS (AXP) 7.x separate from OpenVMS (VAX) 7.x
Rob Grainger wrote: they're running the same kernel
That doesn't matter (to me).
Rob Grainger wrote: Please enlighten me if there are more.
OpenVMS is still alive.
http://h71000.www7.hp.com/openvms/pdf/openvms_roadmaps.pdf[^]
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Not at all I would say, I work on 9... some of them acts as servers and I have to perform some admin tasks on them to make them perform there task optimally. Others are because of licencing which is dependant on running from these pc's. Others are because of software systems that was developed for the particular OS, and then there is the personal use. I'm not even a network admin... Imagine how many computers they use. O - and I forgot about the virtual disk OS which I'm using on my 64bit PC for 32bit dependant applications...
"Program testing can be used to show the presence of bugs, but never to show their absence."
<< please vote!! >>
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R. Erasmus wrote: I work on 9
So not even half way to there!
Stretching it I could imagine some network admins and specialist positions working with 20+ but I don't believe it.
Never underestimate the power of human stupidity
RAH
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The new thing at our company is Virtual Disks... Each project a person works on has got different versions of compilers, tools, and different operating system requirements and thus different configurations it requires... The PCs of today allows for optimal performance of Virtual Disks... running OS inside a OS. Instead of having really complex Environment Variable setup and multiple pc's and having to change configurations continuously we are making use of software such as Virtual Box which runs a OS inside a OS, with which ever OS-, software-, compiler we require for the project. So if I want to work on project X which uses X OS and X tools I open virtual box X. If I'm working with project Y which uses Y OS and Y tools I open virtual box Y. And this goes to infinity, saving infinity on hardware. Our company has a company wide copy of MS which saves infinity on software as well.
"Program testing can be used to show the presence of bugs, but never to show their absence."
<< please vote!! >>
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Collin Jasnoch wrote: supporting manufacturing equipment or embedded systems
Now that is just showing up my limited horizon, I know almost nothing about this area of software but I would happily put it into specialist the positions category. I would have to hunt around to get to 6, digging out retired hard drives would probably be the only way.
Never underestimate the power of human stupidity
RAH
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Collin Jasnoch wrote: there were numerous PLCs from numerous vendors that had different OSes.
....
GE, Allen Bradley, Siemens, National Instruments and many others.
I am mainly working in Automation and I would not count that as OS. Yes, the PLC only works with them, but from the programmer's point of view, those are programming languages or environments.
The same as Windows versus Visual Studio (IMHO VS is not to be considered an OS).
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Collin Jasnoch wrote: They are likely software engineers with a very deep understanding of OS design and theories. Would you not agree with that?
Yes, I do
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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20 OS is the exception (5 out of 2k is marginal).
I'm not one of these for "current use", but for sure worked on more than 20 different OSes in my carreer.
- disassembled and reverse-engineered C64 code and Simon's Basic
- disassembled and reverse-engineered some Atari ST (TOS) code and GfA Basic
- assembly programming on OS9
- programmed on some properietary OSes (AEGIS/Apollo-Domain, Daisy-DNIX, VAX/VMS, Oberon, ...)
- programmed on various Unixes (SunOS, Solaris, Ultrix, HP-UX, AIX)
- programmed on various Linuxes
- programmed on various Windows .../95/2000/NT/XP/7/...
- programmed and (Apple-)scrippeded various MAC/Apple OSes
- programmed on various embedded OSes (hand crafted, bootloaders, ThreadX, various embedded Linuxes...)
- ... you name them
 I become nostalgic about some of these, e.g. Apollo-Domain OS was one of my favorites those days
I wonder how many of you know some of these "historic" OSes (as Wikipedia tags some of these).
Any enthusiasts still maintaining running versions of some of these?
Cheers
Andi
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Andreas Gieriet wrote: I wonder how many of you know some of these "historic" OSes
I would think most of the old farts here with a deep history in computing would know the bulk of these (I'm not one of them, I came to computing in the very late 80s).
Never underestimate the power of human stupidity
RAH
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This number is now up to 14 people. I believe some voters have misunderstood and are simply counting the number of systems they use even if some of them are running the same OS.
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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