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Windows 1.0 Introduced
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Windows 2.0 Introduced
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Windows 3.0 Introduced
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Windows NT Released
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Windows 95 Released
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Windows 98 Introduced
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Windows Me Released
date not known -
Windows 2000 introduced
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Windows XP Released
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Windows Vista
exact date not known -
Windows 7 Released
exact date not known -
Windows 8 Released
exact date not known