Longest used Operating System

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The other day I was thinking about product life cycle... and wondered which OS I have used the longest without upgrade to a new version (I only count the time the OS was used as a main OS), so I made a little list:

AmigaOS 1.3   - 2 years
AmigaOS 3.0   - 7 Years
Windows 98se - 2 Years
BeOS 5.0 PE    - 2 Months
SuSE 7.1         - 6 Months
WindowsME    - 24 Minutes
Windows 2K   - 1.5 Years
WindowsXP    - 2 Years
MaxOS X.4     -  6 Months

From that I noticed that AmigaOS 3.0 must have achieved some kind of record for length of time in service... What about others?

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uncharted wrote:

bloodline wrote:

WindowsME    - 24 Minutes

:roflmao:

That doesn't include installation time...

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whabang wrote:
Win2k for five years.
I still have NT4 on one box, so that'd be 8 years.

That NT Box would only count if it was used as your main machine for 8 years.

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Speelgoedmannetje wrote:
hm, ok, I played around with many OS'es, but I mainly used:
1988-1997 MS-DOS

If that MS-DOS installation was the same one (ie MS-DOS 4.0) for the whole time, then I think MS-DOS is the winner @ 9 years!!!

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uncharted wrote:
While I'm getting a new OS X 10.4 laptop soon, This 10.2 machine will still remain my workhorse.

Oooooh,  a MacBook? :-)

Anyway, I think AmigaOS 3.0 has achieved some kind of record!

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@Karlos

Ok, now you're just showing off... I did specify that I was only interested in the OS you use as your Main OS. :-D

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Karlos wrote:
The title says longest used and you listed a load down to 24 minutes. Why is my post bad? :-P

OS3.0 and up are all still in use on my systems.

Yeah, I actually upgraded to WinME... moved over all my software, Email accounts etc... and had no other computer in my house! 24 minutes later I decided to put 98se back on that machine.

I have various other machines, with various other OSes in my house, but they are for fun, not my main machines :-)