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I answered 3 (nix, win, droid), but if I were to include the OS on network gear I use at work (sporadically), it could number well over 20..
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On my laptop I use Mac OS with Parallels for launching VS2013 via Windows 8.1
My corporate desktop is stuck in the twilight zone with XP but it's still going strong since 2001.
I use iPhone and iPads and have owned Droids and WP7 in the past.
My next project is to get Ubuntu running on Parallels and play with some Java development.
I like tinkering with XCode on Mac for great UI stuff but still prefer VS (C#) for LOB development.
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A lot of people use at least 3 different OS's. I didn't even realize I use 5 on the regular.
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Back in the day when I was running a small support team, we had 17 different OSes to support (and I mean OSes, not versions)
Windows 3.x
Windows 95
Windows NT
MacOS
Netware
Linux
AIX
HPUX
Irix
VMS
OSF1
SunOS (you know, the BSD derived one)
Solaris (the SysV derived one)
Whatever ran on a Thinking Machines CM5 (custom SunOS)
MSP (Fujitsu variant of MVS)
I can't quite remember the last 2 now - possibly I was including MSDOS, and a rather antique Prism computer that ran its own custom Unix variant
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You must have used C/PM surely ...  ... or is just me that's that old
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Yes - I did use CP/M for a period of 8 years, but my CP/M machine (a rather modest brand going by the name of "Superbrain") died a few years before the period when my group was supporting the 17 different OSes. Note that Windows 95 was on the list !
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I should say that during the late 80s, I personally used CP/M, MSDOS, MacOS, VMS, MSP (Fujistu's MVS clone) and whatever ran on Univacs at the time. No doubt the computer support staff at that place (I was just a student at the time) could lay claim to a much larger range.
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How about VOS? I had to support that on a Stratus system back in the 90s. :shudder:
RSTS/E?
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Win 98
Win XP
Win Vista
Win 7
Win 8
Win Home Server
Win SBS 2008
IOS 7
OSX
Ubuntu
Android
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The trifecta
Win7- Primary for home and work
Vista, XP SP3 for home and testing/support cycle
Client Contract Support
Server 2003, Server 2008, MSDOS 6.0, & Win95 I know.. Hey at least I got the win2000 box retired. 
Other
Win8.1 on netbook/tablet convertible
Mac OSX (Mountain Lion) soon to be Mavericks
Ubuntu (Meerkat)
Mobile
WinPhone 7.5
WinMobile 6
Android (ice cream sandwich)
Kindle Fire (gen 1)
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The embedded target I am working on runs QNX. Cross platform work is done in XP and cygwin. The prior 2 projects where an Android tablet and another embedded target running Nucleus. We do overnight builds using Bamboo on machines running Ubuntu. My desktop at home runs Vista (no laughing please), and I'm the technician for my wife's Windows 7 laptop and iPad.
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Win 7 Enterprise at work
Win XP SP3 in VM at work
Win 7 Professional at home
iOS in iPhone
Win98 in ancient desktop (yeah, still working) with some old arcade games I really like 
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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i had one machine on Win98 till few years back... i felt sorry when it finally crashed.. (it was s my first computer)
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Windows 7 on my laptops
Windows Server 2008 On the Server
Android on my Smart Phone
Hello World!
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Windows 7 Ultimate (Home, desktop)
Vista Home Premium (Home, laptop)
Windows 7 Enterprise (Work, laptop)
Windows Server 2008 R2 Enterprise (Work, several VMs)
OpenVMS V8.3 (AXP) (Home, AlphaServer)
OpenVMS V7.2 (AXP) (Home, AlphaServer)
OpenVMS V7.3 (VAX) (Home, MicroVAX)
Android 4.1.2 (Phone)
Android ? (Kindle Fire)
Whatever the XBox 360 runs
And apparently my car's audio system runs some form of Linux
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I used to work a lot with DEC computers including PDP-11/23 and MicroVAX, they had such a good thing going then dropped into oblivion. Shame!
One of the things I liked about them is you could cluster them.
Never did get to work much on the Alpha how is it?
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Mike Hankey wrote: how is it?
All kinds of 64-bit goodness. 
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I noticed you had several DEC machines have you got them clustered?
I think if I had the money I would have an alpha here at the house. I used to do real time client server systems with DEC machines and they are awesome, was sorry to see them fade away.
The first time I got my hands on a MicroVAX my company told me I could buy a computer I did some research and decided I wanted either a IBM or a VAX. I called both companies, DEC got back to me that day IBM took a week???
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Mike Hankey wrote: have you got them clustered?
No. I could cluster the Alphas, but clustering VAX and Alpha together isn't recommended other than perhaps temporarily during a transition.
Furthermore, in my case, I don't run the systems very frequently (noise, heat, power consumption) so it wouldn't make much sense.
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PIEBALDconsult wrote: Furthermore, in my case, I don't run the systems very frequently (noise, heat, power consumption) so it wouldn't make much sense.
Yeah I guess yo wouldn't want to run them too much especially if you don't use them day-to-day.
I got a little nostalgic a few years back and thought about buying one off ebay but got to thinking what the hell would I use it for. Would be fun to play with but I've got so many other things going right now it would sit on a shelf and collect dust.
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Mike Hankey wrote: off ebay
That's where I got mine.
Mike Hankey wrote: what the hell would I use it for
Gloating.
Mike Hankey wrote: sit on a shelf and collect dust
Yeah, mostly.
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PIEBALDconsult wrote: Mike Hankey wrote: off ebay
That's where I got mine.
Out of curiosity, how much did you pay? One my my projects uses a pair of massive alpha boxes to control some high end embedded hardware; and after 8+ years of use how much longer they're going to last is starting to become a concern (the vendor naturally wants a small fortune to do a linux-x64 upgrade). I took a look at what was on ebay now and, excluding parts from stripped systems, it looked like everyone was hoping to get new box prices for their antiques.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Shoot, I wrote a big reply and the hamsters ate it. 
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