os architecture

I know that windows 2000 and XP run on 32bit arch and win7  runs on 64bit arch..
what older arch versions are out there and how about newer ones?
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XK8ERAsked:
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GeodashCommented:
Windows 95 was the first 32 bit (kind-of)

Windows 7, Vista and XP operate at both 32 and 64
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GeodashCommented:
This may explain a little better for you

http://en.wikipedia.org/wiki/Microsoft_Windows
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tliottaCommented:
Since this is listed under Unix, Windows and Miscellaneous, we can definitely say that Win 95 was not the 'first' 32-bit OS.

But seriously, are you really looking for a wide open answer?

Tom
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XK8ERAuthor Commented:
I would like to know a bit of history on any OS and their architectures and future OS..
like

win 95 = 32
win2k = 32
winXP = 32-64
win7 = 32-64

etc.. etc..
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