Where can I download previous versions of Microsoft Operating Systems?

Where can I download previous versions of Microsoft Operating Systems? Like Windows ME, Windows 98, Windows NT and others. I want to test and compare operating systems for my satisfaction of learning new things.
Asked by: Guest \| Views: 249

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Guest [Entry]

If you have a MSDN paid subscription, you have an access to various downloads, and especially old (and very old like Windows 3.11) operating system ISO (CD and DVD) along with the required licensing information.

Guest [Entry]

You can't. Although these operating systems are old, unsupported and no longer for sale, they are still owned by Microsoft and therefore are still illegal to distribute for free (Unless you are Microsoft).